NASA - 2011/2012 CubeSat Launch Opportunities
My Ideal Competition Grade VHF/UHF Radio Wish list.
It seems we are long over do for a Competition grade high performance VHF/UHF transceiver, which can also be used for Satellite operations. There are several competition grade HF transceivers on the market, however there are no high end competition grade VHF/UHF/Satellite systems on the marker.
Most of the rigs I have seen which support VHF/UHF are either HF rigs that have had VHF/UHF slapped on, or low end VHF/UHF rigs, with HF slapped on.
If we want the Amateur Radio manufactures to build us a "GREAT" VHF/UHF/Satellite system, then we need to tell them what we need.
Here are some suggestions. Constructive comments welcome.
This radio does not exist. If the manufactures are interested in providing a new state of the art VHF/UHF radio to the Amateur Radio community, here is one opinion of what should be in next Competition Grade VHF/UHF Transceiver and what should not be in the radio.
I am going to give this fictional radio a name HR-956-Pro.
What do we need:
• We need a competition grade VHF/UHF transceiver that will support Terrestrial-DX, Satellite and EME operations (Voice, CW and Digital-JT65). • The HR-956-Pro, needs to be able to interface with modern computers (HTML Browser, USB and or CAT-5). • The HR-956-Pro, needs to able to interface with modern Externally mounted Pre-amplifier (both power feeds and transmitter sequencing). • The HR-956-Pro, need to be able to interface with modern Solid State Amplifiers and Tube based amplifiers. The RF output per band needs to be standardized with the Amplifier manufactures to prevent transceiver and amplifier failures due to sequencing problems and RF mismatching. • TX/RX Sequencer built-in, to control external Preamps, Amplifies and other accessories (programmable).
Receiver: Of course we need a "Great" receiver, not another mediocre receiver. Each receiver for each band needs to be a "Great" performer.
No Birdies: On a HF rig, a few Birdies do not usually cause serious issues, since the HF users are often listening to signals "Above" the noise floor. On a Satellite Radio, we are often listening to signals 10-30 dB, "Below" the Noise floor. Internally generated birdies are a serious problem for weak signal VHF/UHF operations.
Filters: Each mode will need its own selection of DSP filters. The filters would also affect one of the Line-level outputs to the external PC. There are times when want to send Filtered or unfiltered audio to your external PC for Digital signal processing. One of the line-level outputs should be taped before the HR-956-Pro Filters, the other line-level output should be taped after the HR-956-Pro filters. The TX and RX filters should be independently selectable. The Filters need to be tested to verify they will support Satellite Mode-J (TX on 2-meters while listening on 435-438)
Example: FM-5k, Filters 15k, 10k and 8k filters. AM Filters 10k, 6k, 3k, etc. SSB Filters 4.0k, 3.0k, 2.5k, 2.0k, etc.
Other Modes: CW, FM-2.5k, Data
Audio Quality: Life is too short for QRP or Poor Audio. It's not the number of contacts that’s important, it’s the quality of the contact. On the audio side, the HR-956-Pro needs to be able to support a wider range of audio through most of the stages. Of course the radio needs to meet FCC and other requirements, however we can still design the radio to deliver a wider bandwidth of good sounding audio. Let's shoot for 100-4000 Hz, on both TX and RX audio circuits. This will also mean, that a better stock microphone design will be required.
VHF / UHF Bands built-in, with competition grade TX/RX: 6-meters 50-54 2-meters 144-148 70-cm 420 - 450 23-cm 1280 - 1300 (All frequencies localized for each country)
Transmitter outputs: A high power transceiver is less desirable than a low power transceiver.
Let me explain: For serious Terrestrial DX and EME you need to run more than 100 watts. A VHF/UHF transceiver designed for high power ( 100 watt range) transmitting, would not be compatible with third-party amplifiers or pre-amplifiers.
Most VHF/UHF amps are designed for 25 or 50 watts maximum input.
The manufactures of Transceivers and Amplifies need to agree upon a set of standard power level so the third-party amplifier manufactures can design properly matched Amplifiers and pre-amplifiers. This will also help reduce the number of transceiver and amplifier failures caused by mismatched RF settings.
Suggested standards for VHF/UHF bases stations: 6 Meters 50 watts 2 Meters 25 watts 70 cm 25 watts 900 mc 10 watts 1.2 gig 10 watts
The duty cycle of the competition grade system, will also need to be greater than a 70% duty cycle. A typical EME link running JT65 requires a 50% for 10-30 minutes at a time. The transistors and cooling system needs to be designed accordingly to meet the competition grade requirements.
HR-956-Pro Must have list:
Spectrum display screen: I can't imagine building a new competition grade system without this feature. It would be nice to see the band pass, before and after the filter stages.
Full computer remote control: Memory read/Read and save. All memory channels options must be exportable to a CSV or similar file, including TX and RX frequencies, settings, including Repeater or split frequency settings. All protocols must be Public protocols, no propriety software or licenses.
Doppler Control (Manual):
LEO SSB satellites are some of the hardest satellites two work because of the amount of Doppler frequency change per second. Satellite Mode-B is very hard (70 cm Uplink and 2-meter Downlink). While you are talking through a SSB Mod-B satellite, you need to be simultaneously adjusting your transmitter with every other word, in order to keep your downlink signal centered inside the transponder.
The Yasue FT-736R Satellite control knob, seems to work very well with dual VFO's and provides you the ability to quickly change either TX or RX to compensate for Doppler (among other features). The Knob style is much easier to use than "Buttons". I found the Doppler VFO correction on some newer radios to be very frustrating. The new HR-956-Pro must have the Yasue FT-736R control Knob and it must be functional for both VFO's and Memory Channels.
DSP Noise tools: The usual stuff.
FM Center Tuning Meter: Many of the new satellites are LEO's (Low Earth Orbit), and many of these satellites are running FM-5k. The reason for FM is because the Doppler causes the 70cm band to drift over 20, kHz during a 10-20 minute pass. The LEO SSB satellites using Mode J or Mode B are difficult to use because of the large Doppler change. The FM mode, helps reduce the impact caused by the higher Doppler.
The FM Center Tuning Meter feature is a "must have" for a Satellite radio. When the FM satellite comes in range, just look at the FM meter and tune the receiver until the needle is centered and you now know the exact downlink for that Satellite. If the needle is left, turn the RX knob slowly Right, If the needle is Right, turn the RX knob slowly left, very simple. The Yaesu FT-736R has a FM Center Tuning Meter and it makes working FM satellites much easier. The IC-910 has a blinking light to tell you your FM satellite receiver frequency has drifted. Unfortunately, the blinking light is useless in telling you if your frequency is high or low.
HR-956-Pro, Nice to have list:
General coverage receiver (50 - 1000 megacycles): The addition of a general coverage receiver would help with the sales of the HR-956-Pro. However, it is very important that the general coverage receiver, NOT degrade the performance of the satellite receivers. We are not trying to build a super police scanner. One possible suggestion would-be to make the general coverage receiver a separate circuit board, which would be connected to a separate antenna port and thus would not degraded from the performance of the satellite receivers.
VHF / UHF Optional bands or Transverter: The Amateur radio community is constantly experimenting with new bands. It would be nice to have a Transverter module or expansion module for future bands. In the USA these bands are becoming popular, 220mc, 900 mc, etc
(All frequencies localized for each country)
Size is important: To hold the hardware, band scope, filters and make the buttons easily accessible, a box about the size of the IC-756 product seems to be the right size.
What should not be in the HR-956-Pro.
No HF: No access to frequencies below 50 megacycles. The addition of HF to a satellite radio would only degrade the performance of the weak signal satellite receivers. HF would also add to the cost of the transceiver and reduce its sales potential. A competition grade VHF/UHF transceiver has no use for HF. HF would result in the radio being just another mediocre transceiver.
No obsolete Serial ports: No RS-232 or TTL. These devices are so last century.
DSTAR: The DSTAR mode is fun, I use it often and I have even been pushing ARISS to install it on the International Space Station. As much as I like this mode, it is not a requirement for a competition grade satellite system. I would much rather have the money put into making the VHF/UHF receivers the best possible.
How much are we willing to pay for the HR-956-Pro:
That depends on the performance, suggest price $2000 - $3000 USD
Closing:
If anyone knows of such a radio I would be interested to know who makes it.
Sincerely
WF1F Miles www.marexmg.org
How about IF tap (10.7MHz) and high speed packet ready (up to say, 76k or faster)?
(Maybe I missed it, but I don't think I saw those 2 features...)
73,
Mark N8MH
On Mon, Mar 1, 2010 at 1:44 PM, MM ka1rrw@yahoo.com wrote:
My Ideal Competition Grade VHF/UHF Radio Wish list.
It seems we are long over do for a Competition grade high performance VHF/UHF transceiver, which can also be used for Satellite operations. There are several competition grade HF transceivers on the market, however there are no high end competition grade VHF/UHF/Satellite systems on the marker.
Most of the rigs I have seen which support VHF/UHF are either HF rigs that have had VHF/UHF slapped on, or low end VHF/UHF rigs, with HF slapped on.
If we want the Amateur Radio manufactures to build us a "GREAT" VHF/UHF/Satellite system, then we need to tell them what we need.
Here are some suggestions. Constructive comments welcome.
This radio does not exist. If the manufactures are interested in providing a new state of the art VHF/UHF radio to the Amateur Radio community, here is one opinion of what should be in next Competition Grade VHF/UHF Transceiver and what should not be in the radio.
I am going to give this fictional radio a name HR-956-Pro.
What do we need:
• We need a competition grade VHF/UHF transceiver that will support Terrestrial-DX, Satellite and EME operations (Voice, CW and Digital-JT65). • The HR-956-Pro, needs to be able to interface with modern computers (HTML Browser, USB and or CAT-5). • The HR-956-Pro, needs to able to interface with modern Externally mounted Pre-amplifier (both power feeds and transmitter sequencing). • The HR-956-Pro, need to be able to interface with modern Solid State Amplifiers and Tube based amplifiers. The RF output per band needs to be standardized with the Amplifier manufactures to prevent transceiver and amplifier failures due to sequencing problems and RF mismatching. • TX/RX Sequencer built-in, to control external Preamps, Amplifies and other accessories (programmable).
Receiver: Of course we need a "Great" receiver, not another mediocre receiver. Each receiver for each band needs to be a "Great" performer.
No Birdies: On a HF rig, a few Birdies do not usually cause serious issues, since the HF users are often listening to signals "Above" the noise floor. On a Satellite Radio, we are often listening to signals 10-30 dB, "Below" the Noise floor. Internally generated birdies are a serious problem for weak signal VHF/UHF operations.
Filters: Each mode will need its own selection of DSP filters. The filters would also affect one of the Line-level outputs to the external PC. There are times when want to send Filtered or unfiltered audio to your external PC for Digital signal processing. One of the line-level outputs should be taped before the HR-956-Pro Filters, the other line-level output should be taped after the HR-956-Pro filters. The TX and RX filters should be independently selectable. The Filters need to be tested to verify they will support Satellite Mode-J (TX on 2-meters while listening on 435-438)
Example: FM-5k, Filters 15k, 10k and 8k filters. AM Filters 10k, 6k, 3k, etc. SSB Filters 4.0k, 3.0k, 2.5k, 2.0k, etc.
Other Modes: CW, FM-2.5k, Data
Audio Quality: Life is too short for QRP or Poor Audio. It's not the number of contacts that’s important, it’s the quality of the contact. On the audio side, the HR-956-Pro needs to be able to support a wider range of audio through most of the stages. Of course the radio needs to meet FCC and other requirements, however we can still design the radio to deliver a wider bandwidth of good sounding audio. Let's shoot for 100-4000 Hz, on both TX and RX audio circuits. This will also mean, that a better stock microphone design will be required.
VHF / UHF Bands built-in, with competition grade TX/RX: 6-meters 50-54 2-meters 144-148 70-cm 420 - 450 23-cm 1280 - 1300 (All frequencies localized for each country)
Transmitter outputs: A high power transceiver is less desirable than a low power transceiver.
Let me explain: For serious Terrestrial DX and EME you need to run more than 100 watts. A VHF/UHF transceiver designed for high power ( 100 watt range) transmitting, would not be compatible with third-party amplifiers or pre-amplifiers.
Most VHF/UHF amps are designed for 25 or 50 watts maximum input.
The manufactures of Transceivers and Amplifies need to agree upon a set of standard power level so the third-party amplifier manufactures can design properly matched Amplifiers and pre-amplifiers. This will also help reduce the number of transceiver and amplifier failures caused by mismatched RF settings.
Suggested standards for VHF/UHF bases stations: 6 Meters 50 watts 2 Meters 25 watts 70 cm 25 watts 900 mc 10 watts 1.2 gig 10 watts
The duty cycle of the competition grade system, will also need to be greater than a 70% duty cycle. A typical EME link running JT65 requires a 50% for 10-30 minutes at a time. The transistors and cooling system needs to be designed accordingly to meet the competition grade requirements.
HR-956-Pro Must have list:
Spectrum display screen: I can't imagine building a new competition grade system without this feature. It would be nice to see the band pass, before and after the filter stages.
Full computer remote control: Memory read/Read and save. All memory channels options must be exportable to a CSV or similar file, including TX and RX frequencies, settings, including Repeater or split frequency settings. All protocols must be Public protocols, no propriety software or licenses.
Doppler Control (Manual):
LEO SSB satellites are some of the hardest satellites two work because of the amount of Doppler frequency change per second. Satellite Mode-B is very hard (70 cm Uplink and 2-meter Downlink). While you are talking through a SSB Mod-B satellite, you need to be simultaneously adjusting your transmitter with every other word, in order to keep your downlink signal centered inside the transponder.
The Yasue FT-736R Satellite control knob, seems to work very well with dual VFO's and provides you the ability to quickly change either TX or RX to compensate for Doppler (among other features). The Knob style is much easier to use than "Buttons". I found the Doppler VFO correction on some newer radios to be very frustrating. The new HR-956-Pro must have the Yasue FT-736R control Knob and it must be functional for both VFO's and Memory Channels.
DSP Noise tools: The usual stuff.
FM Center Tuning Meter: Many of the new satellites are LEO's (Low Earth Orbit), and many of these satellites are running FM-5k. The reason for FM is because the Doppler causes the 70cm band to drift over 20, kHz during a 10-20 minute pass. The LEO SSB satellites using Mode J or Mode B are difficult to use because of the large Doppler change. The FM mode, helps reduce the impact caused by the higher Doppler.
The FM Center Tuning Meter feature is a "must have" for a Satellite radio. When the FM satellite comes in range, just look at the FM meter and tune the receiver until the needle is centered and you now know the exact downlink for that Satellite. If the needle is left, turn the RX knob slowly Right, If the needle is Right, turn the RX knob slowly left, very simple. The Yaesu FT-736R has a FM Center Tuning Meter and it makes working FM satellites much easier. The IC-910 has a blinking light to tell you your FM satellite receiver frequency has drifted. Unfortunately, the blinking light is useless in telling you if your frequency is high or low.
HR-956-Pro, Nice to have list:
General coverage receiver (50 - 1000 megacycles): The addition of a general coverage receiver would help with the sales of the HR-956-Pro. However, it is very important that the general coverage receiver, NOT degrade the performance of the satellite receivers. We are not trying to build a super police scanner. One possible suggestion would-be to make the general coverage receiver a separate circuit board, which would be connected to a separate antenna port and thus would not degraded from the performance of the satellite receivers.
VHF / UHF Optional bands or Transverter: The Amateur radio community is constantly experimenting with new bands. It would be nice to have a Transverter module or expansion module for future bands. In the USA these bands are becoming popular, 220mc, 900 mc, etc
(All frequencies localized for each country)
Size is important: To hold the hardware, band scope, filters and make the buttons easily accessible, a box about the size of the IC-756 product seems to be the right size.
What should not be in the HR-956-Pro.
No HF: No access to frequencies below 50 megacycles. The addition of HF to a satellite radio would only degrade the performance of the weak signal satellite receivers. HF would also add to the cost of the transceiver and reduce its sales potential. A competition grade VHF/UHF transceiver has no use for HF. HF would result in the radio being just another mediocre transceiver.
No obsolete Serial ports: No RS-232 or TTL. These devices are so last century.
DSTAR: The DSTAR mode is fun, I use it often and I have even been pushing ARISS to install it on the International Space Station. As much as I like this mode, it is not a requirement for a competition grade satellite system. I would much rather have the money put into making the VHF/UHF receivers the best possible.
How much are we willing to pay for the HR-956-Pro:
That depends on the performance, suggest price $2000 - $3000 USD
Closing:
If anyone knows of such a radio I would be interested to know who makes it.
Sincerely
WF1F Miles www.marexmg.org
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
How about IF tap (10.7MHz) and high speed packet ready (up to say, 76k or faster)?
(Maybe I missed it, but I don't think I saw those 2 features...)
73,
Mark N8MH
I dearly wish my 910 had an IF tap! That would mostly take care of the high speed part too for me.
The manufactures of Transceivers and Amplifies need to agree upon a set of standard power level so the third-party amplifier manufactures can design properly matched Amplifiers and pre-amplifiers. This will also help reduce the number of transceiver and amplifier failures caused by mismatched RF settings.
I'd prefer a menu settable power output for each band, like all of the current Yaesu DC to Daylight rigs have.
The IC-910 has a blinking light to tell you your FM satellite receiver frequency has drifted. Unfortunately, the blinking light is useless in telling you if your frequency is high or low.
Yes, but if you press the AFC button on the 910, it will tune it for you!
No access to frequencies below 50 megacycles.
Many serious 6m ops listen to utilities below 50Mhz to tell when the banding is close to opening.
73, Drew KO4MA (Who'd settle for a full duplex FT-817)
--- On Mon, 3/1/10, Andrew Glasbrenner glasbrenner@mindspring.com wrote:
No access to frequencies below 50 megacycles.
Many serious 6m ops listen to utilities below 50Mhz to tell when the banding is close to opening.
You also need 10m for Mode A. I'm still hoping that RS12/13 pops back to life like AO7 and will have its Mode T going again. That was alot of fun.
73s John AA5JG
Hi John,
My concern with adding 10 meters to a competition class VHF/UHF high end satellite rig, is that the rig will turn into another mediocre HF rig with VHF/UHF added on.
If we do start building Mode-A satellites in the future, then we can always use Two radios, a dedicated HF and a High performance Sat rig.
The primary goal is to have the engineers put all the money into a kick but 6/2/440 transceiver.
Thank you very much for your comments.
WF1F
--- On Mon, 3/1/10, John Geiger aa5jg@yahoo.com wrote:
From: John Geiger aa5jg@yahoo.com Subject: [amsat-bb] Re: Wish List, The Ideal VHF/UHF Sat Rig To: "Mark L. Hammond" marklhammond@gmail.com, "Andrew Glasbrenner" glasbrenner@mindspring.com Cc: amsat-bb@amsat.org Date: Monday, March 1, 2010, 2:32 PM
--- On Mon, 3/1/10, Andrew Glasbrenner glasbrenner@mindspring.com wrote:
No access to frequencies below 50
megacycles.
Many serious 6m ops listen to utilities below 50Mhz to
tell
when the banding is close to opening.
You also need 10m for Mode A. I'm still hoping that RS12/13 pops back to life like AO7 and will have its Mode T going again. That was alot of fun.
73s John AA5JG
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Dear friends,
I agree with the 100W power requirement I completely agree with WF1F about not including the 28Mhz.
I was wondering what about an SDR approach. Until now I just saw hf SDR radios but if it would be possible to use SDR technology most of the requirements would be satisfied and, quite sure, with lower costs and giving us the chance to customize much more easily such features.
An SDR approach would also give to not major hamradio companies a chance to be more competitive on the market = more chances to get from them what we want
Regards Fabio IZ1EGT / F5VKV
On Mon, Mar 1, 2010 at 9:12 PM, MM ka1rrw@yahoo.com wrote:
Hi John,
My concern with adding 10 meters to a competition class VHF/UHF high end satellite rig, is that the rig will turn into another mediocre HF rig with VHF/UHF added on.
If we do start building Mode-A satellites in the future, then we can always use Two radios, a dedicated HF and a High performance Sat rig.
The primary goal is to have the engineers put all the money into a kick but 6/2/440 transceiver.
Thank you very much for your comments.
WF1F
--- On Mon, 3/1/10, John Geiger aa5jg@yahoo.com wrote:
From: John Geiger aa5jg@yahoo.com Subject: [amsat-bb] Re: Wish List, The Ideal VHF/UHF Sat Rig To: "Mark L. Hammond" marklhammond@gmail.com, "Andrew Glasbrenner" <
glasbrenner@mindspring.com>
Cc: amsat-bb@amsat.org Date: Monday, March 1, 2010, 2:32 PM
--- On Mon, 3/1/10, Andrew Glasbrenner glasbrenner@mindspring.com wrote:
No access to frequencies below 50
megacycles.
Many serious 6m ops listen to utilities below 50Mhz to
tell
when the banding is close to opening.
You also need 10m for Mode A. I'm still hoping that RS12/13 pops back to life like AO7 and will have its Mode T going again. That was alot of fun.
73s John AA5JG
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
I'm been thinking about this type of radio also. My wish list (being a Kenwood guy) would be, take the case of the 480 HX load it with 2M ,440, and maybe 1.2G all mode. I'm no radio builder but I would think that using the case and head wouldn't be that hard. I'd really like to see something other than the ts-2000 that would run the sats.
N0FJP
-------------------------------------------------- From: "Fabio Roccatagliata" roccaf@gmail.com Sent: Monday, March 01, 2010 02:30 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: Wish List, The Ideal VHF/UHF Sat Rig
Dear friends,
I agree with the 100W power requirement I completely agree with WF1F about not including the 28Mhz.
I was wondering what about an SDR approach. Until now I just saw hf SDR radios but if it would be possible to use SDR technology most of the requirements would be satisfied and, quite sure, with lower costs and giving us the chance to customize much more easily such features.
An SDR approach would also give to not major hamradio companies a chance to be more competitive on the market = more chances to get from them what we want
Regards Fabio IZ1EGT / F5VKV
On Mon, Mar 1, 2010 at 9:12 PM, MM ka1rrw@yahoo.com wrote:
Hi John,
My concern with adding 10 meters to a competition class VHF/UHF high end satellite rig, is that the rig will turn into another mediocre HF rig with VHF/UHF added on.
If we do start building Mode-A satellites in the future, then we can always use Two radios, a dedicated HF and a High performance Sat rig.
The primary goal is to have the engineers put all the money into a kick but 6/2/440 transceiver.
Thank you very much for your comments.
WF1F
--- On Mon, 3/1/10, John Geiger aa5jg@yahoo.com wrote:
From: John Geiger aa5jg@yahoo.com Subject: [amsat-bb] Re: Wish List, The Ideal VHF/UHF Sat Rig To: "Mark L. Hammond" marklhammond@gmail.com, "Andrew Glasbrenner" <
glasbrenner@mindspring.com>
Cc: amsat-bb@amsat.org Date: Monday, March 1, 2010, 2:32 PM
--- On Mon, 3/1/10, Andrew Glasbrenner glasbrenner@mindspring.com wrote:
No access to frequencies below 50
megacycles.
Many serious 6m ops listen to utilities below 50Mhz to
tell
when the banding is close to opening.
You also need 10m for Mode A. I'm still hoping that RS12/13 pops back to life like AO7 and will have its Mode T going again. That was alot of fun.
73s John AA5JG
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
I ordered a cheap 6 meter SDR (about $20) to dedicate with a netbook to monitor the beacon portion of 6 meters.
73 de W4AS (who wants to daisy chain a Flex 1500 with a couple of DEMI transverters)
Many serious 6m ops listen to utilities below 50Mhz to tell when the banding is close to opening.
73, Drew KO4MA (Who'd settle for a full duplex FT-817)
I would opt for higher power on the bands, with separate RF setting for each band through a menu. Something like 100 watts on 6m 2m, 220 and 432 to start with. It would be good for roving to have high enough power levels to not have to take amps with you. And if you want to run an amp at home, you can set the drive level in the menus and leave it there.
73s John AA5JG
--- On Mon, 3/1/10, Mark L. Hammond marklhammond@gmail.com wrote:
From: Mark L. Hammond marklhammond@gmail.com Subject: [amsat-bb] Re: Wish List, The Ideal VHF/UHF Sat Rig To: "MM" ka1rrw@yahoo.com Cc: amsat-bb@amsat.org Date: Monday, March 1, 2010, 12:55 PM How about IF tap (10.7MHz) and high speed packet ready (up to say, 76k or faster)?
(Maybe I missed it, but I don't think I saw those 2 features...)
73,
Mark N8MH
On Mon, Mar 1, 2010 at 1:44 PM, MM ka1rrw@yahoo.com wrote:
My Ideal Competition Grade VHF/UHF Radio Wish list.
It seems we are long over do for a Competition grade
high performance VHF/UHF transceiver, which can also be used for Satellite operations. There are several competition grade HF transceivers on the market, however there are no high end competition grade VHF/UHF/Satellite systems on the marker.
Most of the rigs I have seen which support VHF/UHF
are either HF rigs that have had VHF/UHF slapped on, or low end VHF/UHF rigs, with HF slapped on.
If we want the Amateur Radio manufactures to build us
a "GREAT" VHF/UHF/Satellite system, then we need to tell them what we need.
Here are some suggestions. Constructive comments
welcome.
This radio does not exist. If the manufactures are interested in providing a new
state of the art VHF/UHF radio to the Amateur Radio community, here is one opinion of what should be in next Competition Grade VHF/UHF Transceiver and what should not be in the radio.
I am going to give this fictional radio a name
HR-956-Pro.
What do we need:
• We need a competition grade VHF/UHF
transceiver that will support Terrestrial-DX, Satellite and EME operations (Voice, CW and Digital-JT65).
• The HR-956-Pro, needs to be able to
interface with modern computers (HTML Browser, USB and or CAT-5).
• The HR-956-Pro, needs to able to
interface with modern Externally mounted Pre-amplifier (both power feeds and transmitter sequencing).
• The HR-956-Pro, need to be able to
interface with modern Solid State Amplifiers and Tube based amplifiers. The RF output per band needs to be standardized with the Amplifier manufactures to prevent transceiver and amplifier failures due to sequencing problems and RF mismatching.
• TX/RX Sequencer built-in, to control
external Preamps, Amplifies and other accessories (programmable).
Receiver: Of course we need a "Great" receiver, not another
mediocre receiver.
Each receiver for each band needs to be a "Great"
performer.
No Birdies: On a HF rig, a few Birdies do not usually cause
serious issues, since the HF users are often listening to signals "Above" the noise floor. On a Satellite Radio, we are often listening to signals 10-30 dB, "Below" the Noise floor. Internally generated birdies are a serious problem for weak signal VHF/UHF operations.
Filters: Each mode will need its own selection of DSP filters.
The filters would also affect one of the Line-level outputs to the external PC. There are times when want to send Filtered or unfiltered audio to your external PC for Digital signal processing. One of the line-level outputs should be taped before the HR-956-Pro Filters, the other line-level output should be taped after the HR-956-Pro filters. The TX and RX filters should be independently selectable.
The Filters need to be tested to verify they will
support Satellite Mode-J (TX on 2-meters while listening on 435-438)
Example: FM-5k, Filters 15k, 10k and 8k filters. AM Filters 10k, 6k, 3k, etc. SSB Filters 4.0k, 3.0k, 2.5k, 2.0k,
etc.
Other Modes: CW, FM-2.5k, Data
Audio Quality: Life is too short for QRP or Poor Audio. It's not the number of contacts that’s important,
it’s the quality of the contact.
On the audio side, the HR-956-Pro needs to be able to
support a wider range of audio through most of the stages. Of course the radio needs to meet FCC and other requirements, however we can still design the radio to deliver a wider bandwidth of good sounding audio.
Let's shoot for 100-4000 Hz, on both TX and RX audio
circuits. This will also mean, that a better stock microphone design will be required.
VHF / UHF Bands built-in, with competition grade
TX/RX:
6-meters 50-54 2-meters 144-148 70-cm 420 - 450 23-cm 1280 - 1300 (All frequencies localized for each country)
Transmitter outputs: A high power transceiver is less desirable than a low
power transceiver.
Let me explain: For serious Terrestrial DX and EME you need to run
more than 100 watts. A VHF/UHF transceiver designed for high power ( 100 watt range) transmitting, would not be compatible with third-party amplifiers or pre-amplifiers.
Most VHF/UHF amps are designed for 25 or 50 watts
maximum input.
The manufactures of Transceivers and Amplifies need to
agree upon a set of standard power level so the third-party amplifier manufactures can design properly matched Amplifiers and pre-amplifiers. This will also help reduce the number of transceiver and amplifier failures caused by mismatched RF settings.
Suggested standards for VHF/UHF bases stations: 6 Meters 50 watts 2 Meters 25 watts 70 cm 25 watts 900 mc 10 watts 1.2 gig 10 watts
The duty cycle of the competition grade system, will
also need to be greater than a 70% duty cycle.
A typical EME link running JT65 requires a 50% for
10-30 minutes at a time. The transistors and cooling system needs to be designed accordingly to meet the competition grade requirements.
HR-956-Pro Must have list:
Spectrum display screen: I can't imagine building a new competition
grade system without this feature.
It would be nice to see the band pass,
before and after the filter stages.
Full computer remote control: Memory read/Read and save. All memory channels
options must be exportable to a CSV or similar file, including TX and RX frequencies, settings, including Repeater or split frequency settings.
All protocols must be Public protocols, no propriety
software or licenses.
Doppler Control (Manual):
LEO SSB satellites are some of the hardest satellites
two work because of the amount of Doppler frequency change per second. Satellite Mode-B is very hard (70 cm Uplink and 2-meter Downlink). While you are talking through a SSB Mod-B satellite, you need to be simultaneously adjusting your transmitter with every other word, in order to keep your downlink signal centered inside the transponder.
The Yasue FT-736R Satellite control knob, seems to
work very well with dual VFO's and provides you the ability to quickly change either TX or RX to compensate for Doppler (among other features). The Knob style is much easier to use than "Buttons". I found the Doppler VFO correction on some newer radios to be very frustrating.
The new HR-956-Pro must have the Yasue FT-736R control
Knob and it must be functional for both VFO's and Memory Channels.
DSP Noise tools: The usual stuff.
FM Center Tuning Meter: Many of the new satellites are LEO's (Low Earth
Orbit), and many of these satellites are running FM-5k. The reason for FM is because the Doppler causes the 70cm band to drift over 20, kHz during a 10-20 minute pass. The LEO SSB satellites using Mode J or Mode B are difficult to use because of the large Doppler change. The FM mode, helps reduce the impact caused by the higher Doppler.
The FM Center Tuning Meter feature is a "must have"
for a Satellite radio.
When the FM satellite comes in range, just look at the
FM meter and tune the receiver until the needle is centered and you now know the exact downlink for that Satellite. If the needle is left, turn the RX knob slowly Right, If the needle is Right, turn the RX knob slowly left, very simple.
The Yaesu FT-736R has a FM Center Tuning Meter and it
makes working FM satellites much easier. The IC-910 has a blinking light to tell you your FM satellite receiver frequency has drifted. Unfortunately, the blinking light is useless in telling you if your frequency is high or low.
HR-956-Pro, Nice to have list:
General coverage receiver (50 - 1000 megacycles): The addition of a general coverage receiver would help
with the sales of the HR-956-Pro. However, it is very important that the general coverage receiver, NOT degrade the performance of the satellite receivers. We are not trying to build a super police scanner. One possible suggestion would-be to make the general coverage receiver a separate circuit board, which would be connected to a separate antenna port and thus would not degraded from the performance of the satellite receivers.
VHF / UHF Optional bands or Transverter: The Amateur radio community is constantly
experimenting with new bands. It would be nice to have a Transverter module or expansion module for future bands. In the USA these bands are becoming popular, 220mc, 900 mc, etc
(All frequencies localized for each country)
Size is important: To hold the hardware, band scope, filters and make the
buttons easily accessible, a box about the size of the IC-756 product seems to be the right size.
What should not be in the HR-956-Pro.
No HF: No access to frequencies below 50 megacycles. The addition of HF to a satellite radio would only
degrade the performance of the weak signal satellite receivers.
HF would also add to the cost of the transceiver and
reduce its sales potential.
A competition grade VHF/UHF transceiver has no use for
HF.
HF would result in the radio being just another
mediocre transceiver.
No obsolete Serial ports: No RS-232 or TTL. These devices are so last century.
DSTAR: The DSTAR mode is fun, I use it often and I have even
been pushing ARISS to install it on the International Space Station. As much as I like this mode, it is not a requirement for a competition grade satellite system. I would much rather have the money put into making the VHF/UHF receivers the best possible.
How much are we willing to pay for the HR-956-Pro:
That depends on the performance, suggest price $2000 -
$3000 USD
Closing:
If anyone knows of such a radio I would be interested
to know who makes it.
Sincerely
WF1F Miles www.marexmg.org
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Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the
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-- Mark L. Hammond [N8MH]
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Hello,
beeing an engineer (RF/telecom) and V/UHF (and sat) addicted, I'm always thinkin about this very same issue, but I think that the best RTX would come from a bunch of engineers with an "open source" like project, not from one of the current manufacturers. Why? First because one such rig would cost too much in engineering research and project (if it really need to be state of the art and no compromise); secondly because no one would buy the next rig if such a great RTX would really exists. As for the features, comments are in line
On 3/1/10, MM ka1rrw@yahoo.com wrote:
My Ideal Competition Grade VHF/UHF Radio Wish list.
It seems we are long over do for a Competition grade high performance VHF/UHF transceiver, which can also be used for Satellite operations. There are several competition grade HF transceivers on the market, however there are no high end competition grade VHF/UHF/Satellite systems on the marker.
Most of the rigs I have seen which support VHF/UHF are either HF rigs that have had VHF/UHF slapped on, or low end VHF/UHF rigs, with HF slapped on.
If we want the Amateur Radio manufactures to build us a "GREAT" VHF/UHF/Satellite system, then we need to tell them what we need.
Here are some suggestions. Constructive comments welcome.
This radio does not exist. If the manufactures are interested in providing a new state of the art VHF/UHF radio to the Amateur Radio community, here is one opinion of what should be in next Competition Grade VHF/UHF Transceiver and what should not be in the radio.
I am going to give this fictional radio a name HR-956-Pro.
What do we need:
• We need a competition grade VHF/UHF transceiver that will support Terrestrial-DX, Satellite and EME operations (Voice, CW and Digital-JT65). • The HR-956-Pro, needs to be able to interface with modern computers (HTML Browser, USB and or CAT-5).
Ok for USB, maybe ethernet, but I'd put the controlling software on the PC/computer end, CPU in my opinion needs to do only the essential non the inside of the RTX, we don't really need heavy digital noise/birdies and no necessary power consumption. You need to have a computer anyway. Yes, digital noise and birdies can be confined, but if it's the least possible from start, I'd vote for it.
• The HR-956-Pro, needs to able to interface with modern Externally mounted Pre-amplifier (both power feeds and transmitter sequencing).
agreed.
• The HR-956-Pro, need to be able to interface with modern Solid State Amplifiers and Tube based amplifiers. The RF output per band needs to be standardized with the Amplifier manufactures to prevent transceiver and amplifier failures due to sequencing problems and RF mismatching.
it's good to have power level set by software settings in case of amplifier presence. However many solid state amplifiers have poor IMD performance when operated at a lower setting. This needs to be addressed from the project stage.
• TX/RX Sequencer built-in, to control external Preamps, Amplifies and other accessories (programmable).
agreed.
Receiver: Of course we need a "Great" receiver, not another mediocre receiver. Each receiver for each band needs to be a "Great" performer.
separate receivers and transmitter chains, in my dreams the RTX can host one module per band and one module per IF, yes, two separate IF chains are a must for satellite work or just to monitor two bands at time. One could also chose analog or fully digital IF module too. Let's say 4 bays for band modules and two bays for IF modules. Of course all IF stages are accessible both pre-filtered and post-filtered.
No Birdies: On a HF rig, a few Birdies do not usually cause serious issues, since the HF users are often listening to signals "Above" the noise floor. On a Satellite Radio, we are often listening to signals 10-30 dB, "Below" the Noise floor. Internally generated birdies are a serious problem for weak signal VHF/UHF operations.
agreed. I'd add, the lowest possible phase noise on conversion oscillators, I'd have no more than two total conversions per band. All oscillators locked to internal or external 10 MHz reference.
Filters: Each mode will need its own selection of DSP filters. The filters would also affect one of the Line-level outputs to the external PC. There are times when want to send Filtered or unfiltered audio to your external PC for Digital signal processing. One of the line-level outputs should be taped before the HR-956-Pro Filters, the other line-level output should be taped after the HR-956-Pro filters. The TX and RX filters should be independently selectable. The Filters need to be tested to verify they will support Satellite Mode-J (TX on 2-meters while listening on 435-438)
Example: FM-5k, Filters 15k, 10k and 8k filters. AM Filters 10k, 6k, 3k, etc. SSB Filters 4.0k, 3.0k, 2.5k, 2.0k, etc.
Other Modes: CW, FM-2.5k, Data
that can be straightforward on digital IF, for analog IF I'd stick with 3 per mode and optional, not everyone will need every mode. What AM is for anyway?
Audio Quality: Life is too short for QRP or Poor Audio. It's not the number of contacts that’s important, it’s the quality of the contact. On the audio side, the HR-956-Pro needs to be able to support a wider range of audio through most of the stages. Of course the radio needs to meet FCC and other requirements, however we can still design the radio to deliver a wider bandwidth of good sounding audio. Let's shoot for 100-4000 Hz, on both TX and RX audio circuits. This will also mean, that a better stock microphone design will be required.
I'd drop this. I'd rather have very low distortion audio amplifiers with maybe a large enough BW to let the FM guys have their chat on repeaters, even if I prefer to think about an high performance rig, not a very general purpose rig. Audio BW shouldn't be more large than what's needed to match the widest IF filter anyway. We don't want any noise added for weak signal operations.
VHF / UHF Bands built-in, with competition grade TX/RX: 6-meters 50-54
make it 40-60 MHz on RX, lots of opening indicators to watch for.
4-meters is also a must 60-80 MHz RX, tx can be 69.5-70.5 MHz.
2-meters 144-148 70-cm 420 - 450
I wouldn't make it that large, we need good RX performance and tuned frontends are a must. Probably 430-450 can be still made good, but I wouldn't do more and anyway leave a 430-440 MHz module as an option for region 1.
23-cm 1280 - 1300 (All frequencies localized for each country)
Transmitter outputs: A high power transceiver is less desirable than a low power transceiver.
Let me explain: For serious Terrestrial DX and EME you need to run more than 100 watts. A VHF/UHF transceiver designed for high power ( 100 watt range) transmitting, would not be compatible with third-party amplifiers or pre-amplifiers.
think about satellite only, 100W out is ok for sat only. I'd stay with the classic 100W per band and have clean low power menu-settable options for linears owners.
Most VHF/UHF amps are designed for 25 or 50 watts maximum input.
The manufactures of Transceivers and Amplifies need to agree upon a set of standard power level so the third-party amplifier manufactures can design properly matched Amplifiers and pre-amplifiers. This will also help reduce the number of transceiver and amplifier failures caused by mismatched RF settings.
they will hardly agree. It's better to have a versatile transceiver that can interface with everything the engineers can think of.
Suggested standards for VHF/UHF bases stations: 6 Meters 50 watts 2 Meters 25 watts 70 cm 25 watts 900 mc 10 watts 1.2 gig 10 watts
I'd stick with 100W from 6m to 70cm, the others at 10W can be ok.
The duty cycle of the competition grade system, will also need to be greater than a 70% duty cycle. A typical EME link running JT65 requires a 50% for 10-30 minutes at a time. The transistors and cooling system needs to be designed accordingly to meet the competition grade requirements.
one minute at 100% power, nothing less. Some countries have > 1Kw legal limit, it's possible that such amplifiers require 100W drive levels. Also, meteorscatter operation on lower bands is common with the 100W level, so why upsetting the happy QRPers?
HR-956-Pro Must have list:
Spectrum display screen: I can't imagine building a new competition grade system without this feature. It would be nice to see the band pass, before and after the filter stages.
I'd leave it as an option maybe. Nice to have, but makes the thing bigger and power hungrier. On VHF we usually are happy with a fast memory scan on beacons and maybe TV carriers.
Full computer remote control: Memory read/Read and save. All memory channels options must be exportable to a CSV or similar file, including TX and RX frequencies, settings, including Repeater or split frequency settings. All protocols must be Public protocols, no propriety software or licenses.
that's good, but leave the effort to PC programs.
Doppler Control (Manual):
LEO SSB satellites are some of the hardest satellites two work because of the amount of Doppler frequency change per second. Satellite Mode-B is very hard (70 cm Uplink and 2-meter Downlink). While you are talking through a SSB Mod-B satellite, you need to be simultaneously adjusting your transmitter with every other word, in order to keep your downlink signal centered inside the transponder.
I always find mode B easier to work with manual doppler corrections. The higher band is the TX band, so usually I only have to turn one knob during a QSO even if the other party is using only higher band manual correction like I'm doing.
The Yasue FT-736R Satellite control knob, seems to work very well with dual VFO's and provides you the ability to quickly change either TX or RX to compensate for Doppler (among other features). The Knob style is much easier to use than "Buttons". I found the Doppler VFO correction on some newer radios to be very frustrating. The new HR-956-Pro must have the Yasue FT-736R control Knob and it must be functional for both VFO's and Memory Channels.
if modular, each of the IF strips will have its completely independent VFO, both can be linked for satellite operations anyway.
DSP Noise tools: The usual stuff.
well, yes, but please tunable notch. And I mean TUNABLE.
FM Center Tuning Meter: Many of the new satellites are LEO's (Low Earth Orbit), and many of these satellites are running FM-5k. The reason for FM is because the Doppler causes the 70cm band to drift over 20, kHz during a 10-20 minute pass. The LEO SSB satellites using Mode J or Mode B are difficult to use because of the large Doppler change. The FM mode, helps reduce the impact caused by the higher Doppler.
true, doppler impact is reduced on FM, typically also the QSO possibility are reduced because the one channel is a mess (at least over europe).
The FM Center Tuning Meter feature is a "must have" for a Satellite radio. When the FM satellite comes in range, just look at the FM meter and tune the receiver until the needle is centered and you now know the exact downlink for that Satellite. If the needle is left, turn the RX knob slowly Right, If the needle is Right, turn the RX knob slowly left, very simple.
yes, FM discriminator is good to have, I'd add AFC to automaticly tune to the center of the FM channel.
The Yaesu FT-736R has a FM Center Tuning Meter and it makes working FM satellites much easier. The IC-910 has a blinking light to tell you your FM satellite receiver frequency has drifted. Unfortunately, the blinking light is useless in telling you if your frequency is high or low.
HR-956-Pro, Nice to have list:
General coverage receiver (50 - 1000 megacycles):
not easy (or cheap) to have good receivers if too large. In my modular dream each module has different RX frontend filters for each sub-band (like each 5 MHz on 6m or even less).
The addition of a general coverage receiver would help with the sales of the HR-956-Pro. However, it is very important that the general coverage receiver, NOT degrade the performance of the satellite receivers. We are not trying to build a super police scanner. One possible suggestion would-be to make the general coverage receiver a separate circuit board, which would be connected to a separate antenna port and thus would not degraded from the performance of the satellite receivers.
that could be a separate module to add for the police listeners :)
VHF / UHF Optional bands or Transverter: The Amateur radio community is constantly experimenting with new bands. It would be nice to have a Transverter module or expansion module for future bands. In the USA these bands are becoming popular, 220mc, 900 mc, etc
if the dream rig is made modular from the beginning, this will never be a problem again.
(All frequencies localized for each country)
Size is important: To hold the hardware, band scope, filters and make the buttons easily accessible, a box about the size of the IC-756 product seems to be the right size.
What should not be in the HR-956-Pro.
No HF: No access to frequencies below 50 megacycles. The addition of HF to a satellite radio would only degrade the performance of the weak signal satellite receivers.
not true, you could easily add an HF module and that would not degrade the performance of everything else (on satellite we still have a 29 MHz sat!), the secret is "modular".
HF would also add to the cost of the transceiver and reduce its sales potential. A competition grade VHF/UHF transceiver has no use for HF. HF would result in the radio being just another mediocre transceiver.
not true if everything is modular. The terrestrial or EME guys could start with two modules (6m/2m maybe) and one single IF module, either the digital one or analog one. The sat-only guy would only need 2m/70cm module and the two IFs. One day he would add the HF module to work AO-07 mode A.
No obsolete Serial ports: No RS-232 or TTL. These devices are so last century.
they still work very well however. I wouldn't miss it, but always think about the engineer point of view: both USB and ethernet require higher clock rates and produce more digital noise to filter out.
DSTAR: The DSTAR mode is fun, I use it often and I have even been pushing ARISS to install it on the International Space Station. As much as I like this mode, it is not a requirement for a competition grade satellite system. I would much rather have the money put into making the VHF/UHF receivers the best possible.
agreed, I don't see how DSTAR can find a place in the DX V/UHF world.
How much are we willing to pay for the HR-956-Pro:
That depends on the performance, suggest price $2000 - $3000 USD
it depends.... state of the art electronic isn't necessarily expensive. Look at low phase noise oscillators/buffer/amplifiers and high performance frontends, they're not that much costly than poor performers. All digital IFs are a reality and we could even think about direct digital frontends at least on the lower VHF bands. It's engineers that know how to do them right that cost. An "open source" kind of approach might work, if we hope a big manufacturer is going to make a dream trasceiver, I'm afraid I'm not going to buy a newer transceiver soon.
It can be done, I'm definitely sure.
73 Frank IZ8DWF
On Mon, 2010-03-01 at 21:30 +0100, francesco messineo wrote:
Hello,
beeing an engineer (RF/telecom) and V/UHF (and sat) addicted, I'm always thinkin about this very same issue, but I think that the best RTX would come from a bunch of engineers with an "open source" like project, not from one of the current manufacturers.
How I wish Motorola would open-source their firmware for their commercial radios. I spent a whole day working around *stupid* bugs in Mototrbo radios, that I'm pretty certain I could have fixed properly in the same amount of time given access to the appropriate developer toolchain and source.
I'm still stuck with a crash bug triggered by trying to clear an Emergency button activation - so when you hit your "emergency" button the dispatcher radio resets itself. Ooooh-kay, I'll just file a bug... oh no I won't, because I can't and Motorola do not welcome any comments about software or hardware defects. Great job, guys. </rant>
Gordon MM0YEQ
On 01 Mar 2010, at 13:44, MM wrote:
VHF / UHF Optional bands or Transverter: The Amateur radio community is constantly experimenting with new bands. It would be nice to have a Transverter module or expansion module for future bands. In the USA these bands are becoming popular, 220mc, 900 mc, etc
Expansion modules would be very nice--drop it in and it works. 900, 2.3/2.4 GHz, maybe even higher bands.
No obsolete Serial ports: No RS-232 or TTL. These devices are so last century.
RS232 is still extremely important for interfacing with older computers, accessories, or homebrew gadgets. I can't think of a simpler way to do it. Maybe put it on something other than a DE-9 connector though.
Mike KI4RIX
Best regards,
Mike Benonis mike@benonis.net KI4RIX
You forgot to include 222 MHz. With 222 MHz, you would sell a lot to weak signal VHF guys. It is even more lacking in commercial gear than satellite capable rigs.
I loved Mode A, so I second including 28 MHz. Plus if you don't include 222 MHz, people who have transverters can use 28 MHz as an IF.
I assume that you are talking about two radios in a single box, or if not you should be. One of the radios at least should have a separate receive input to facilitate separate feedline runs to a mast mounted preamp. That simplifies switching at the antenna a lot, particualrly with a built in sequencer (by band).
Two antenna inputs per band. This would allow a high gain antenna and an omnidirectional antenna to be used without antenna switching external to the radio. The ability to share a single antenna input between band or bands would be nice.
I rove a lot and would like the rig for that. For roving, 100W per band, perhaps 30W-50W on 902 and 1296 is the minimum acceptable for portable use. If the power is adjustable per band, I do not see the problem with this power level. Also, there is a lot to be gained in tropo work in going from 25W to 100W, lots and lots.
Good front end filtering is essential.
With a SDR, why not build in a computer with tracking, logging, digital modes available. Just plug in a keyboard and mike and go.
IF output is very useful for lots of things.
A pair of K2s, equipped with the XV50 to XV432 series transverters come close to meeting your requirements, as does a K3 equipped with the subreceiver and XV144 to XV432 transverters. In particular, the Elecraft implementation of transverter interface and switching is very nice. - Duffey
-- KK6MC James Duffey Cedar Crest NM
Actually I would like to see something like the FT817 does, where you have 6 or so antenna jacks on the back and you can menu select the jack for each band, so you could put 6m and 2m on one jack if you have a dualband antenna, or put 2m/70cm on one, etc.
73s JOhn AA5JG
--- On Mon, 3/1/10, James Duffey jamesduffey@comcast.net wrote:
From: James Duffey jamesduffey@comcast.net Subject: [amsat-bb] Re: Wish List, The Ideal VHF/UHF Sat Rig To: "MM" ka1rrw@yahoo.com Cc: "James Duffey" jamesduffey@comcast.net, amsat-bb@amsat.org Date: Monday, March 1, 2010, 7:15 PM You forgot to include 222 MHz. With 222 MHz, you would sell a lot to weak signal VHF guys. It is even more lacking in commercial gear than satellite capable rigs.
I loved Mode A, so I second including 28 MHz. Plus if you don't include 222 MHz, people who have transverters can use 28 MHz as an IF.
I assume that you are talking about two radios in a single box, or if not you should be. One of the radios at least should have a separate receive input to facilitate separate feedline runs to a mast mounted preamp. That simplifies switching at the antenna a lot, particualrly with a built in sequencer (by band).
Two antenna inputs per band. This would allow a high gain antenna and an omnidirectional antenna to be used without antenna switching external to the radio. The ability to share a single antenna input between band or bands would be nice.
I rove a lot and would like the rig for that. For roving, 100W per band, perhaps 30W-50W on 902 and 1296 is the minimum acceptable for portable use. If the power is adjustable per band, I do not see the problem with this power level. Also, there is a lot to be gained in tropo work in going from 25W to 100W, lots and lots.
Good front end filtering is essential.
With a SDR, why not build in a computer with tracking, logging, digital modes available. Just plug in a keyboard and mike and go.
IF output is very useful for lots of things.
A pair of K2s, equipped with the XV50 to XV432 series transverters come close to meeting your requirements, as does a K3 equipped with the subreceiver and XV144 to XV432 transverters. In particular, the Elecraft implementation of transverter interface and switching is very nice. - Duffey
-- KK6MC James Duffey Cedar Crest NM
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participants (12)
-
Andrew Glasbrenner -
Fabio Roccatagliata -
francesco messineo -
Gordon JC Pearce -
James Duffey -
John Geiger -
Mark L. Hammond -
Mike Benonis -
MM -
racer -
Sebastian -
Trevor .