I'm troubleshooting an HP 3586, I have a very small signal out of the A5 module, but I don't know what the amplitude should be.
Here's the area around the mixer. There are two signal the the input frequency 50Hz to 32MHZ and the
> tracking frequency 50MHZ to 82MHz. The difference should be about 50MHZ to pass the 50MHZ filter
> (10kHz wide)
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formatting link
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> I'm using at X10 probe on 2mv/div, so 20mv/div.
> The 4mvpp to 8mvpp signal goes into a 50MHz BP filter, I see nothing out, but it then goes to 15db amp and I see about 6mvpp of signal.
> I question the signal amplitudes, I think they should be higher.
> Each side of T3 primary has 35mvpp vs to 30mvpp into T1.
> I specifically question the output of U1. Should it have any gain? It has almost the same output as input .
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> Thanks, for your help, Mikek