Re: [amsat-bb] Handheld for LEO satellites?
The Alinco DJ-G7 claims to be full-duplex capable. Anybody have thoughts on that radio?
Steve AI9IN [email protected]
On Wed, Jan 21, 2015 at 1:11 PM, D. Craig Fox [email protected] wrote:
All of the foregoing responses express valid approaches. One thing to keep in mind if going the HT approach, is the long term reliability of the radio. The fact that there are still so many Icoms, Kenwoods, Yaesus out there is evidence of their long term reliability. Perhaps the inexpensive Chinese radios will stand the test of time- maybe not. But for very little more than the cost of two of the new cheap radios, you can have a full duplex HT. As others have said, there is no real substitute for hearing your downlink. I happen to like my full duplex Kenwood D7 because of its on board TNC giving me the ability to communicate through the ISS digipeater as I point my elk antenna while watching it go by. Way cool experience.
If you get really bitten by the sat bug like most of us, you will eventually want a full duplex, all function transceiver to enable you to work the linear (rd: low stress, high fun) satellites. Consider saving up for that instead.
Just my $.02
Craig N6RSX
NOTICE: This communication may contain privileged or other confidential information. If you are not the intended recipient of this communication, or an employee or agent responsible for delivering this communication to the intended recipient, please advise the sender by reply email and immediately delete the message and any attachments without copying or disclosing the contents. Thank you. _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
I bought one of the first ones when released. It's a neat radio, but desenses badly in full duplex mode.
73, Drew KO4MA
Sent from my iPhone
On Jan 21, 2015, at 2:43 PM, Steve Kristoff [email protected] wrote:
The Alinco DJ-G7 claims to be full-duplex capable. Anybody have thoughts on that radio?
Steve AI9IN [email protected]
On Wed, Jan 21, 2015 at 1:11 PM, D. Craig Fox [email protected] wrote:
All of the foregoing responses express valid approaches. One thing to keep in mind if going the HT approach, is the long term reliability of the radio. The fact that there are still so many Icoms, Kenwoods, Yaesus out there is evidence of their long term reliability. Perhaps the inexpensive Chinese radios will stand the test of time- maybe not. But for very little more than the cost of two of the new cheap radios, you can have a full duplex HT. As others have said, there is no real substitute for hearing your downlink. I happen to like my full duplex Kenwood D7 because of its on board TNC giving me the ability to communicate through the ISS digipeater as I point my elk antenna while watching it go by. Way cool experience.
If you get really bitten by the sat bug like most of us, you will eventually want a full duplex, all function transceiver to enable you to work the linear (rd: low stress, high fun) satellites. Consider saving up for that instead.
Just my $.02
Craig N6RSX
NOTICE: This communication may contain privileged or other confidential information. If you are not the intended recipient of this communication, or an employee or agent responsible for delivering this communication to the intended recipient, please advise the sender by reply email and immediately delete the message and any attachments without copying or disclosing the contents. Thank you. _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
If you transmit on VHF, it will desense on UHF and you won't be able to hear yourself on SO-50, negating the purpose of being full-duplex.
It might be OK for satellites with a UHF uplink and a VHF downlink, but that remains to be seen. The same thing applies to the Wouxoun KG-UV8D.
73,
Paul, N8HM
On Wed, Jan 21, 2015 at 2:43 PM, Steve Kristoff [email protected] wrote:
The Alinco DJ-G7 claims to be full-duplex capable. Anybody have thoughts on that radio?
Steve AI9IN [email protected]
On Wed, Jan 21, 2015 at 1:11 PM, D. Craig Fox [email protected] wrote:
All of the foregoing responses express valid approaches. One thing to
keep
in mind if going the HT approach, is the long term reliability of the radio. The fact that there are still so many Icoms, Kenwoods, Yaesus out there is evidence of their long term reliability. Perhaps the
inexpensive
Chinese radios will stand the test of time- maybe not. But for very
little
more than the cost of two of the new cheap radios, you can have a full duplex HT. As others have said, there is no real substitute for hearing your downlink. I happen to like my full duplex Kenwood D7 because of its on board TNC giving me the ability to communicate through the ISS digipeater as I point my elk antenna while watching it go by. Way cool experience.
If you get really bitten by the sat bug like most of us, you will eventually want a full duplex, all function transceiver to enable you to work the linear (rd: low stress, high fun) satellites. Consider saving up for that instead.
Just my $.02
Craig N6RSX
NOTICE: This communication may contain privileged or other confidential information. If you are not the intended recipient of this communication, or an employee or agent responsible for delivering this communication to the intended recipient, please advise the sender by reply email and immediately delete the message and any attachments without copying or disclosing the contents. Thank you. _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership.
Opinions
expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Do you think that the desense might be mitigated by using an Arrow dual band yagi with duplexer?
TIA & 73 de Dennis KD7CAC Scottsdale, AZ
On Jan 21, 2015, at 12:49 PM, Paul Stoetzer [email protected] wrote:
If you transmit on VHF, it will desense on UHF and you won't be able to hear yourself on SO-50, negating the purpose of being full-duplex.
It might be OK for satellites with a UHF uplink and a VHF downlink, but that remains to be seen. The same thing applies to the Wouxoun KG-UV8D.
73,
Paul, N8HM
On Wed, Jan 21, 2015 at 2:43 PM, Steve Kristoff [email protected] wrote:
The Alinco DJ-G7 claims to be full-duplex capable. Anybody have thoughts on that radio?
Steve AI9IN [email protected]
That didn't help with my G7. It's a shame, because otherwise I like the radio.
73, Drew KO4MA
-----Original Message----- From: AMSAT-BB [mailto:[email protected]] On Behalf Of Dennis Griffin Sent: Saturday, July 11, 2015 12:38 PM To: Paul Stoetzer Cc: amsat-bb bb Subject: Re: [amsat-bb] Handheld for LEO satellites?
Do you think that the desense might be mitigated by using an Arrow dual band yagi with duplexer?
TIA & 73 de Dennis KD7CAC Scottsdale, AZ
On Jan 21, 2015, at 12:49 PM, Paul Stoetzer [email protected] wrote:
If you transmit on VHF, it will desense on UHF and you won't be able to hear yourself on SO-50, negating the purpose of being full-duplex.
It might be OK for satellites with a UHF uplink and a VHF downlink, but that remains to be seen. The same thing applies to the Wouxoun
KG-UV8D.
73,
Paul, N8HM
On Wed, Jan 21, 2015 at 2:43 PM, Steve Kristoff [email protected] wrote:
The Alinco DJ-G7 claims to be full-duplex capable. Anybody have thoughts on that radio?
Steve AI9IN [email protected]
_______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
I ended up getting two Baofeng UV82R HTs. They work fine, but they have the same problem of the UHF radio desensing when I transmit with the VHF. So, not full duplex. I did just buy the Arrow Duplexer to go with my Arrow Antenna. My plan is to still use two radios and just use the duplexer on the VHF uplink side to see if it kills the third harmonic enough to prevent desensing of the UHF radio. I can give a report after I try it. If anyone sees a problem in my plan, please speak up soon before I fry something. Thank you!
Steve AI9IN
----- Original Message ----- From: "Dennis Griffin" [email protected] To: "Paul Stoetzer" [email protected] Cc: "amsat-bb bb" [email protected] Sent: Saturday, July 11, 2015 12:37 PM Subject: Re: [amsat-bb] Handheld for LEO satellites?
Do you think that the desense might be mitigated by using an Arrow dual band yagi with duplexer?
TIA & 73 de Dennis KD7CAC Scottsdale, AZ
On Jan 21, 2015, at 12:49 PM, Paul Stoetzer [email protected] wrote:
If you transmit on VHF, it will desense on UHF and you won't be able to hear yourself on SO-50, negating the purpose of being full-duplex.
It might be OK for satellites with a UHF uplink and a VHF downlink, but that remains to be seen. The same thing applies to the Wouxoun KG-UV8D.
73,
Paul, N8HM
On Wed, Jan 21, 2015 at 2:43 PM, Steve Kristoff [email protected] wrote:
The Alinco DJ-G7 claims to be full-duplex capable. Anybody have thoughts on that radio?
Steve AI9IN [email protected]
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sounds like a good plan Steve.
My only thoughts are:
1) You may lose some power through the duplexer. I recall they can be quite lossy. 2) The desense on UHF may be 3rd harmonic. In which case the duplexer or a low pass filter will be OK in the 2m side. But.. 3) The 'desense' may be due to the UHF radio input being unfiltered...In which case it is 2m overload. In that case you need a high pass filter on the UHF radio input.
I really hope it isn't the same as my ICOM 706G which transmits phase noise everywhere. - No cure for that !
Good luck.
David
-----Original Message----- From: Steve Kristoff [email protected] To: amsat-bb bb [email protected] Sent: Sat, 11 Jul 2015 18:22 Subject: Re: [amsat-bb] Handheld for LEO satellites?
I ended up getting two Baofeng UV82R HTs. They work fine, but they have the
same problem of the UHF radio desensing when I transmit with the VHF. So,
not full duplex. I did just buy the Arrow Duplexer to go with my Arrow Antenna. My plan is to still use two radios and just use the duplexer on the VHF uplink side to see if it kills the third harmonic enough to prevent desensing of the UHF radio. I can give a report after I try it. If anyone sees a problem in my plan, please speak up soon before I fry something. Thank you!
Steve AI9IN
----- Original Message ----- From: "Dennis Griffin" [email protected] To: "Paul Stoetzer" [email protected] Cc: "amsat-bb bb" [email protected] Sent: Saturday, July 11, 2015 12:37 PM Subject: Re: [amsat-bb] Handheld for LEO satellites?
Do you think that the desense
might be mitigated by using an Arrow dual
band yagi with duplexer?
TIA
& 73 de Dennis KD7CAC
Scottsdale, AZ
On Jan 21, 2015, at 12:49 PM,
Paul Stoetzer [email protected] wrote:
If you transmit on VHF, it will
desense on UHF and you won't be able to
hear yourself on SO-50, negating the
purpose of being full-duplex.
It might be OK for satellites with a UHF
uplink and a VHF downlink, but
that remains to be seen. The same thing
applies to the Wouxoun KG-UV8D.
73,
Paul, N8HM
On Wed,
Jan 21, 2015 at 2:43 PM, Steve Kristoff [email protected]
wrote:
The Alinco DJ-G7 claims to be full-duplex capable. Anybody have
thoughts
on that radio?
Steve AI9IN
Sent
via [email protected]. AMSAT-NA makes this open forum available
to all
interested persons worldwide without requiring membership. Opinions
expressed
are solely those of the author, and do not reflect the official
views of
AMSAT-NA. Not an AMSAT-NA member? Join now to support the
amateur satellite program!
Subscription settings:
http://www.amsat.org/mailman/listinfo/amsat-bb
_______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Thanks for the feedback, David! My "plan B" is to try the duplexer on the UHF receive side, if plan A doesn't work. I'm probably out of plans after that, at least for a while.
Steve AI9IN
----- Original Message ----- From: "David G0MRF via AMSAT-BB" [email protected] To: [email protected]; [email protected] Sent: Saturday, July 11, 2015 1:33 PM Subject: Re: [amsat-bb] Handheld for LEO satellites?
Sounds like a good plan Steve.
My only thoughts are:
- You may lose some power through the duplexer. I recall they can be
quite lossy. 2) The desense on UHF may be 3rd harmonic. In which case the duplexer or a low pass filter will be OK in the 2m side. But.. 3) The 'desense' may be due to the UHF radio input being unfiltered...In which case it is 2m overload. In that case you need a high pass filter on the UHF radio input.
I really hope it isn't the same as my ICOM 706G which transmits phase noise everywhere. - No cure for that !
Good luck.
David
-----Original Message----- From: Steve Kristoff [email protected] To: amsat-bb bb [email protected] Sent: Sat, 11 Jul 2015 18:22 Subject: Re: [amsat-bb] Handheld for LEO satellites?
I ended up getting two Baofeng UV82R HTs. They work fine, but they have the
same problem of the UHF radio desensing when I transmit with the VHF. So,
not full duplex. I did just buy the Arrow Duplexer to go with my Arrow Antenna. My plan is to still use two radios and just use the duplexer on the VHF uplink side to see if it kills the third harmonic enough to prevent desensing of the UHF radio. I can give a report after I try it. If anyone sees a problem in my plan, please speak up soon before I fry something. Thank you!
Steve AI9IN
----- Original Message ----- From: "Dennis Griffin" [email protected] To: "Paul Stoetzer" [email protected] Cc: "amsat-bb bb" [email protected] Sent: Saturday, July 11, 2015 12:37 PM Subject: Re: [amsat-bb] Handheld for LEO satellites?
Do you think that the desense
might be mitigated by using an Arrow dual
band yagi with duplexer?
TIA
& 73 de Dennis KD7CAC
Scottsdale, AZ
On Jan 21, 2015, at 12:49 PM,
Paul Stoetzer [email protected] wrote:
If you transmit on VHF, it will
desense on UHF and you won't be able to
hear yourself on SO-50, negating the
purpose of being full-duplex.
It might be OK for satellites with a UHF
uplink and a VHF downlink, but
that remains to be seen. The same thing
applies to the Wouxoun KG-UV8D.
73,
Paul, N8HM
On Wed,
Jan 21, 2015 at 2:43 PM, Steve Kristoff [email protected]
wrote:
The Alinco DJ-G7 claims to be full-duplex capable. Anybody have
thoughts
on that radio?
Steve AI9IN
Sent
via [email protected]. AMSAT-NA makes this open forum available
to all
interested persons worldwide without requiring membership. Opinions
expressed
are solely those of the author, and do not reflect the official
views of
AMSAT-NA. Not an AMSAT-NA member? Join now to support the
amateur satellite program!
Subscription settings:
http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Steve Kristoff [email protected]
"A few chords strummed on a ukulele, enough to please a few others beside yourself, does more good in this world than the combined efforts of all the financiers and politicians that ever lived." - Frank Littig, Littig's New Harmony Self Instructor Chords for Ukulele, Banjuke or Taro Patch Fiddle, Chart Music Publishing House, Chicago, Illinois, 1924
The diplexer will likely be more effective as a high pass filter on the UHF receive, but try both configurations.
73, Drew KO4MA
Sent from my iPhone
On Jul 11, 2015, at 1:22 PM, Steve Kristoff [email protected] wrote:
I ended up getting two Baofeng UV82R HTs. They work fine, but they have the same problem of the UHF radio desensing when I transmit with the VHF. So, not full duplex. I did just buy the Arrow Duplexer to go with my Arrow Antenna. My plan is to still use two radios and just use the duplexer on the VHF uplink side to see if it kills the third harmonic enough to prevent desensing of the UHF radio. I can give a report after I try it. If anyone sees a problem in my plan, please speak up soon before I fry something. Thank you!
Steve AI9IN
----- Original Message ----- From: "Dennis Griffin" [email protected] To: "Paul Stoetzer" [email protected] Cc: "amsat-bb bb" [email protected] Sent: Saturday, July 11, 2015 12:37 PM Subject: Re: [amsat-bb] Handheld for LEO satellites?
Do you think that the desense might be mitigated by using an Arrow dual band yagi with duplexer?
TIA & 73 de Dennis KD7CAC Scottsdale, AZ
On Jan 21, 2015, at 12:49 PM, Paul Stoetzer [email protected] wrote:
If you transmit on VHF, it will desense on UHF and you won't be able to hear yourself on SO-50, negating the purpose of being full-duplex.
It might be OK for satellites with a UHF uplink and a VHF downlink, but that remains to be seen. The same thing applies to the Wouxoun KG-UV8D.
73,
Paul, N8HM
On Wed, Jan 21, 2015 at 2:43 PM, Steve Kristoff [email protected] wrote:
The Alinco DJ-G7 claims to be full-duplex capable. Anybody have thoughts on that radio?
Steve AI9IN [email protected]
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
participants (6)
-
Andrew Glasbrenner -
David G0MRF -
Dennis Griffin -
Paul Stoetzer -
Steve Kristoff -
Steve Kristoff