开云体育

Hi everyone,
I recently pulled out the old RXTX and connected it up.? RX is fine, but it would seem my TX is not.? Any suggestions for troubleshooting?? I figure I could put a dummy load on it and work backwards from the antenna output.
Cheers,Phil N3YHF

On 14/09/2023 16:15, Philip Yuengling via groups.io wrote:

Hi everyone,
I recently pulled out the old RXTX and connected it up.? RX is fine, but it would seem my TX is not.? Any suggestions for troubleshooting?? I figure I could put a dummy load on it and work backwards from the antenna output.

Phil

I'd start the other way.
Does it go into TX mode?
Is it being fed TX audio?
Does it get to the mixer?
Does RF come out the mixer?

73 Alan G4ZFQ

I don't know anything about the software, but the T/R switching on the RXTX is a kind of flip-flop using a feedback loop. It should be controlled, but I had some trouble with it. I could trigger T vs R by touching the board in certain places.

I would check the band filter settings, if you have an oscilloscope great ,
otherwise If you have a spare receiver you could use that as a signal
tracer.

On Thu, Sep 14, 2023 at 4:15?PM Philip Yuengling via groups.io <pyuengling=
[email protected]> wrote:

Hi everyone,
I recently pulled out the old RXTX and connected it up. RX is fine, but
it would seem my TX is not. Any suggestions for troubleshooting? I figure
I could put a dummy load on it and work backwards from the antenna output.
Cheers,Phil N3YHF