Re: PIC Question (UPDATE)
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hi Bill, by the way: if you use a probe with x10 on your osci, then Ri is 10M¦¸!?
Did you measure the voltages also with your osci? .8 volts at the signal generator as measured with the scope.? ?(Generator is a Tektronix 191) Set it to DC coupling input? Yes ? What resistive value do you get between center of input jack and ground if you connect your?50¦¸?dummy load to the unpowered AT OUT? is it 50¦¸ or do you see another value, perhaps open circuit?? No resistance value shown just continuity.? Looks like a dead short. ? If your tx sends with 10W, you have 31.6Vss at 50¦¸. Are you able to verify this with your scope if you go to the input-jack of the AT?? Only seeing .3 volts on the scope with probe on X1 scale.
I thought about this last night, and I think the problem may be in the SWR Bridge.? It appears something is short circuiting the RF to ground.? Is there way to check the SMT capacitors in circuit, C71-C19?
The video shows what the scope displays at the Input and Output when transmitting at 10 watts in.? Volts/Div scale set at .1 volts.
Kinda going in circles now!!
Bill
On Sunday, November 10, 2024 at 08:48:56 AM CST, Immo, DL5KB <dl5kb@...> wrote:
hi Bill,
by the way: if you use a probe with x10 on your osci, then Ri is 10M¦¸!?
Did you measure the voltages also with your osci? Set it to DC coupling input?
?
What resistive value do you get between center of input jack and ground if you connect your 50¦¸ dummy load? to the unpowered AT OUT?
is it 50¦¸ or do you see another value, perhaps open circuit?
?
If your tx sends with 10W, you have 31.6Vss at 50¦¸. Are you able to verify this with your scope if you go to the input-jack of the AT?
?
73, Immo
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