Thanks again John and Nick,
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Managed to get some more PD time.
I disconnected the cat on D3 and D6 to see if that told me anything but I don’t think it it did, results below, look like the only delta is D3 and D6 stay at 5v on TX, but I guess that’s because LPF3 is not disconnected.
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D3 & D6 Cat disconnected
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On RX
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?
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On TX
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Diode cat
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80m
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40m
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20m
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Diode cat
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80m
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40m
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20m
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D1
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0
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5v DC
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5v DC
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D1
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5v AC
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5v DC
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5v DC
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D2
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5v DC
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0
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5v DC
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D2
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5v DC
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5v AC
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5v DC
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D3
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0
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0
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5v DC
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D3
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5v AC
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5v DC
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5v DC
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D4
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0
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5v DC
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5v DC
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D4
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5v DC
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5v DC
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5v DC
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D5
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5v DC
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0
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5v DC
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D5
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5v DC
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5v AC
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5v DC
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D6
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0
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0
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5v DC
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D6
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5v DC
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5v DC
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5v DC
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Still the big delta on TX remains. TBH I don’t really understanbd how the circute works, bit, sure but the whole soup to nuts is stilkl beyond me so I’m taking your advice and interpreting it as best I can. I’ve started looking at T1 to see what that tells me:
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T1
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40m
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20m
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RX
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TX
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RX
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TX
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2 tap coil (one is ground)
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0
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6v AC
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0
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2v AC
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3 tap coil top (Q8/10)
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5v DC
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3.6v DC +1.7mV AC
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5v DC
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4v DC +0.6V AC
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3 tap coil mid (L14)
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5v DC
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5v DC
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5v DC
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5v DC
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3 tap coil bottom (Q9/11)
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5v DC
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3.6v DC +1.7mV AC
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5v DC
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4v DC +0.6V AC
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Now I’m really confused!!
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