I've been on 24 GHz for some years. Longest QSO was about 120 miles on CW.
My station uses an Endwave SDH transceiver with 1 watt out. And a 12 inch
dish.

73, Zack W9SZ

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On Sun, Apr 25, 2021 at 9:17 AM Trevor Clarke via mvus-list <
mvus-list@lists.febo.com> wrote:

Never did that but sounds like an interesting project.

On Sun, Apr 25, 2021, 10:41 AM Zack Widup via mvus-list <
mvus-list@lists.febo.com> wrote:

Zack,
Is that a CW/SSB only transceiver or does it support WFM? Since I'm
building a gunnplexer I'll be limited to that mode. That said, I'd love
some pointers on the antenna system. The gunn cavity has a small feedhorn
attached right now and I think that should give me about a 30° FOV and
maybe 17dB gain? I've also got a few satellite TV dishes which could bump
that to maybe 35dB at a couple degrees? Do my calculations seem right?

On Sun, Apr 25, 2021 at 10:41 AM Zack Widup via mvus-list <
mvus-list@lists.febo.com> wrote:

--
Trevor R.H. Clarke
Computer Science House
Rochester Institute of Technology
retrev@csh.rit.edu
http://www.csh.rit.edu/~retrev/

Nice, but you cannot work a Gunnplexer with that station.
Kent WA5VJB
On Sunday, April 25, 2021, 09:34:42 AM CDT, Zack Widup via mvus-list mvus-list@lists.febo.com wrote:

I've been on 24 GHz for some years. Longest QSO was about 120 miles on CW.
My station uses an Endwave SDH transceiver with 1 watt out. And a 12 inch
dish.

73, Zack W9SZ

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On Sun, Apr 25, 2021 at 9:17 AM Trevor Clarke via mvus-list <
mvus-list@lists.febo.com> wrote:

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Hi Trevor,

The SDH transceiver uses whatever mode you use on your IF rig. I use CW and
SSB, but you can certainly use WBFM. These transverter modules are almost
impossible to get these days, as radio amateurs grabbed up all of them that
appeared on the surplus market some years ago. They use a 432 (or 440) MHz
IF. You have to provide the  power supply voltages and  LO .

My dish is a commercially-made dish. It uses a splash-plate feed and WR-42
waveguide input/output. I was lucky to get that, too. WA5VJB measured it at
one of the VHF/microwave conferences and said it is as close to the
theoretical prediction for gain as he has seen.

73, Zack W9SZ

On Sun, Apr 25, 2021 at 10:09 AM Trevor Clarke via mvus-list <
mvus-list@lists.febo.com> wrote:

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Narrow band stations cannot work Gunnplexer stations.
The whole idea of a Gunnplexer is you transmitt and receive at the same time.Sounds like a twisted wire phone call.
The two stations are offset in frequency by the IF frequency.  That is both stations are onseparate frequencies.    I'll keep the math simple here using 100 MHz IF's

Station 1    TX    24.100 GHz                              Mixer has two images so listening on 24.000 and 24.200 GHz
Station 2    TX     24.200 GHz                               Mixer has two images, so listening on 24.100 and 24.300 GHz 
24.200 - 24.100 GHz QSO.
So the transmitter is your LO and your LO is your transmitter.
When you FM your 'LO' you hear your own voice in the receiver when you are tuned to the other station.
Fun QSO's actually.   With 200 Milliwatt Gunns, 18 inch dishes, and GaAs FET IF amps we were able to do some troposcatter QSO's on 10.250 GHz some years ago.
Good DX'ing Kent WA5VJB
On Sunday, April 25, 2021, 10:09:37 AM CDT, Trevor Clarke via mvus-list mvus-list@lists.febo.com wrote:

Zack,
Is that a CW/SSB only transceiver or does it support WFM? Since I'm
building a gunnplexer I'll be limited to that mode. That said, I'd love
some pointers on the antenna system. The gunn cavity has a small feedhorn
attached right now and I think that should give me about a 30° FOV and
maybe 17dB gain? I've also got a few satellite TV dishes which could bump
that to maybe 35dB at a couple degrees? Do my calculations seem right?

On Sun, Apr 25, 2021 at 10:41 AM Zack Widup via mvus-list <
mvus-list@lists.febo.com> wrote:

--
Trevor R.H. Clarke
Computer Science House
Rochester Institute of Technology
retrev@csh.rit.edu
http://www.csh.rit.edu/~retrev/

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For the other station to hear you, you would need to send out a carrier and wideband FM modulate that carrier.Then have your SDR tuned some distance away to hear his signal.    But the SSB/CW station has to drop the carrier to listen.  Second you do that the other stations AFC looses lock and wanders away.   And of course would the IF amp in the narrowband system support a 244 MHz or 44 MHz IF instead of 144 MHz?     
You might make a QSO, but you will spend a lot of time chasing each other around the band.

On Sunday, April 25, 2021, 10:47:00 AM CDT, Zack Widup via mvus-list <mvus-list@lists.febo.com> wrote:  

Hi Trevor,

The SDH transceiver uses whatever mode you use on your IF rig. I use CW and
SSB, but you can certainly use WBFM. These transverter modules are almost
impossible to get these days, as radio amateurs grabbed up all of them that
appeared on the surplus market some years ago. They use a 432 (or 440) MHz
IF. You have to provide the  power supply voltages and  LO .

My dish is a commercially-made dish. It uses a splash-plate feed and WR-42
waveguide input/output. I was lucky to get that, too. WA5VJB measured it at
one of the VHF/microwave conferences and said it is as close to the
theoretical prediction for gain as he has seen.

73, Zack W9SZ

On Sun, Apr 25, 2021 at 10:09 AM Trevor Clarke via mvus-list <
mvus-list@lists.febo.com> wrote:

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Good point, Kent. I didn't think of that.

I have made NBFM QSO's a couple times on 10 GHz when my battery voltage was
too low and the LO was too unstable to make a CW or SSB QSO. But that was
with a station doing the same with a transverter.

73, Zack W9SZ

On Sun, Apr 25, 2021 at 10:55 AM KENT BRITAIN wa5vjb@flash.net wrote:

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