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we have a short, I think just at the entry of the AT.? What do you measure at unpowered AT between input jack center to ground? Continuity?Does it change, when powered up?? NO Do you use the

The defective Cs you can find in unpowered mode by measuring their resistive value, should anyway be like open circuit. Do the measures both ways to see, if there are any semiconductors in parallel,

hi Bill, we have a short, I think just at the entry of the AT.? What do you measure at unpowered AT between input jack center to ground? Does it change, when powered up? Do you use the external

Picture and not video.? Can't get the video to load.Bill

hi Bill,by the way: if you use a probe with x10 on your osci, then Ri is 10MΩ!? Did you measure the voltages also with your osci? .8 volts at the signal generator as measured with the scope.?

I give a little drawing on this for seeing possible levels on the AT , 10W RF applied...

hi Bill, by the way: if you use a probe with x10 on your osci, then Ri is 10MΩ! Did you measure the voltages also with your osci? Set it to DC coupling input? What resistive value do you get between

You can‘t receive any signal through the AT but signal from generator goes through!!! Do you measure only over stray capacities with yor skope? (Ri>10M).Scope Probe was on 10X.? It's a Tektronix

Thank you for your reply. I agree.? Will continue looking. Bill

As your oscilloscope has a high impedance its obvious it may see something, but if your receiver looks dead, maybe your tandem match is the problem, bad cores, wiring shortage, wrong connected/wired,

hi Bill, something stinks… You can‘t receive any signal through the AT but signal from generator goes through!!! Do you measure only over stray capacities with yor skope? (Ri>10M). At what power

I tested both diodes with my multimeter.? The forward voltage drop was .29 volts with them in the circuit.? I have good continuity between the input and T2.? Continuity through T2 as well.? Still

Bill, you wrote: Looks like the PIC may be bad.? It's not initiating tuning when RF is applied. If there is no voltage at the reverse diode D1, then SWR = 1!! What to tune? tuning takes place only

I will check that again. ?Very good instructions!!Bill

Bill, you have to check the functionality of the diodes. If there goes RF through, you must find a voltage at the forward diode D2, i.e. abt 2.4V while applying 10W of RF. If there is nothing, the

I was able to trace a signal from my signal generator from the input all the way to the output.? The DC power was on. Looks like the PIC may be bad.? It's not initiating tuning when RF is

Those are really helpful pictures!!? Thank you for taking the time to prepare and post them. I will use the pictures and trace a signal through the tuner.? Where the signal stops should be the

hi Bill, ther seems a problem with your e-mail.. so I post the pictures as added pictures at the forum. 73, Immo

I didn't receive the email.? Please try again.? ko4nrbs@... I have been looking for a broken wire, etc. but haven't found anything yet.? I do agree that something is preventing the RF from

I did it (E-Mail) with two high-resolution pictures of PCB to show the signal path through the AT. I guess, that a wire is broken at the input, perhaps the wire through the binocular has bad