I thought I had subscribed to the digest version of this list, but apparently I subscribed to the drama version.
Is there a mailing list that focuses on the technical aspects of amateur satellite use? For example, I would like to know of SSTV events and other operational aspects. I don't care to know about infighting of AMSAT members and officers.
Does anyone have some suggestions? Thank you in advance.
Michael
I don't think there is a stop on any of the topics you mention. Nothing is stopping anyone from asking or posting about SSTV events, antennas, rotors, sat beacons or favorite cheese dip recipes.
Henry K5YDD
On 8/9/2020 11:39 AM, Michael B via AMSAT-BB wrote:
I thought I had subscribed to the digest version of this list, but apparently I subscribed to the drama version.
Is there a mailing list that focuses on the technical aspects of amateur satellite use? For example, I would like to know of SSTV events and other operational aspects. I don't care to know about infighting of AMSAT members and officers.
Does anyone have some suggestions? Thank you in advance.
Michael _______________________________________________ Sent via AMSAT-BB@amsat.org. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
On August 9, 2020 1:15:00 PM CDT, HenryTurner via AMSAT-BB amsat-bb@amsat.org wrote:
I don't think there is a stop on any of the topics you mention. Nothing
is stopping anyone from asking or posting about SSTV events, antennas, rotors, sat beacons or favorite cheese dip recipes.
Indeed! Let's see if we can out-topic the mudslingers in here with real technical topics.
Here's what I'm working on:
I just ordered a replacement microphone for my FT-847, as it did not come with one.
The 3D printed passive Lindenblad article is written and needs a good going over before submission to the journal. On-air experience is good!
I've ordered some 433MHz SAW filter (RFMi) from Mouser to install at the output of my homebrew LNA. Hopefully this will reduce overload of the FT-847. A FCDP+, with it's internal SAW, works very well with that antenna and LNA, so I think I'm on the right track.
That have y'all been working on?
--- Zach N0ZGO
Zach,
I'm finally finishing up the SatNOGS Rotator V2 project that was started... Now how many years ago did we start that little project? ;)
I built the SatNOGS Rotator Controller V1.2 a couple of months ago. Now I got the Arduino Pro Micro programmed and getting the steppers and AZ/EL home sensors wired up. Instead of using a WR703N, I'll interface the Arduino to a Raspberry Pi 3 that will run some tracking software.
73,
Mac Cody / AE5PH
On 8/9/20 4:57 PM, Zach Metzinger via AMSAT-BB wrote:
On August 9, 2020 1:15:00 PM CDT, HenryTurner via AMSAT-BB amsat-bb@amsat.org wrote:
I don't think there is a stop on any of the topics you mention. Nothing
is stopping anyone from asking or posting about SSTV events, antennas, rotors, sat beacons or favorite cheese dip recipes.
Indeed! Let's see if we can out-topic the mudslingers in here with real technical topics.
Here's what I'm working on:
I just ordered a replacement microphone for my FT-847, as it did not come with one.
The 3D printed passive Lindenblad article is written and needs a good going over before submission to the journal. On-air experience is good!
I've ordered some 433MHz SAW filter (RFMi) from Mouser to install at the output of my homebrew LNA. Hopefully this will reduce overload of the FT-847. A FCDP+, with it's internal SAW, works very well with that antenna and LNA, so I think I'm on the right track.
That have y'all been working on?
--- Zach N0ZGO _______________________________________________ Sent via AMSAT-BB@amsat.org. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
On August 9, 2020 4:57:21 PM CDT, Zach Metzinger via AMSAT-BB amsat-bb@amsat.org wrote:
I've ordered some 433MHz SAW filter (RFMi) from Mouser to install at the output of my homebrew LNA. Hopefully this will reduce overload of the FT-847. A FCDP+, with it's internal SAW, works very well with that antenna and LNA, so I think I'm on the right track.
Success! The SAW filter eliminated the offending cell-tower sources. The noise floor barely moves when the preamp is switched in, while the desired beacon signal increases significantly.
I will be attempting to measure the NF with the Y-factor method.
The exact filter used was SF2446E (Digikey 2410-SF2446E-ND).
--- Zach N0ZGO
On 08/11/20 21:47, Zach Metzinger via AMSAT-BB wrote:
Success! The SAW filter eliminated the offending cell-tower sources. The noise floor barely moves when the preamp is switched in, while the desired beacon signal increases significantly.
The 3-D printed passive Lindenblad + homebrew LNA, driving 75' of look-alike-LMR400 is working well for receiving RS-44 now. The LMR400 is optional, as there is plenty of gain from the MAX2640 LNA, but was used to keep losses down when transmitting on this antenna.
I can reliably copy the RS-44 beacon about 8 degrees above the horizon, and SSB is quite readable at about 20 degrees.
A horizon-to-horizon pass recording is located here:
http://www.n0zgo.net/oscar/rs44_12082020_1802.mp3
(The good stuff starts at about 7 minutes into the recording. I chase the beacon at the end in CW mode, and it disappears at 5 degrees elevation.)
A FT-847 was used for reception, but a cheap SDR dongle would probably work just as well for a lost-cost entry into 70cm downlink capability (as required for the GOLF satellites).
Now to wire it up for automatic Doppler correction and we're in business.
73,
--- Zach N0ZGO
Nice recording and information, TKS ! for sharing.
As an alternative, http://amsat.org.ar/pass.exe concurrent with HDSDR could automatic handle & control Doppler on any generic SDR for RS-44 or any other sat.
73, lu7abf, Pedro
,On 8/12/20, Zach Metzinger via AMSAT-BB amsat-bb@amsat.org wrote:
On 08/11/20 21:47, Zach Metzinger via AMSAT-BB wrote:
Success! The SAW filter eliminated the offending cell-tower sources. The noise floor barely moves when the preamp is switched in, while the desired beacon signal increases significantly.
The 3-D printed passive Lindenblad + homebrew LNA, driving 75' of look-alike-LMR400 is working well for receiving RS-44 now. The LMR400 is optional, as there is plenty of gain from the MAX2640 LNA, but was used to keep losses down when transmitting on this antenna.
I can reliably copy the RS-44 beacon about 8 degrees above the horizon, and SSB is quite readable at about 20 degrees.
A horizon-to-horizon pass recording is located here:
http://www.n0zgo.net/oscar/rs44_12082020_1802.mp3
(The good stuff starts at about 7 minutes into the recording. I chase the beacon at the end in CW mode, and it disappears at 5 degrees elevation.)
A FT-847 was used for reception, but a cheap SDR dongle would probably work just as well for a lost-cost entry into 70cm downlink capability (as required for the GOLF satellites).
Now to wire it up for automatic Doppler correction and we're in business.
73,
--- Zach N0ZGO _______________________________________________ Sent via AMSAT-BB@amsat.org. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
On 08/09/2020 09:39, Michael B via AMSAT-BB wrote:
I thought I had subscribed to the digest version of this list, but apparently I subscribed to the drama version.
Is there a mailing list that focuses on the technical aspects of amateur satellite use? For example, I would like to know of SSTV events and other operational aspects. I don't care to know about infighting of AMSAT members and officers.
Wait till after the election. It hopefully will get back to normal.
participants (6)
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HenryTurner -
Jim Walls -
Mac A. Cody -
Michael B -
Pedro Converso -
Zach Metzinger