I¡¯m thinking that the key will be found in the mode switching. For some reason, the transmitter is shifting as if it¡¯s in CW mode.?
I agree that it probably isn¡¯t a bad filter.?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS
On Wed, Apr 5, 2023 at 11:46, wb6ogd <
garywinblad@...> wrote:
Chris,
The T-4XC carrier frequency should not change between sidebands.? Yes, you are probably correct, that is the problem.
The carrier oscillator and the filter selection are isolated by the IF amp so even a bad filter shouldn't cause the frequency change.
I would measure the supply voltage (zener CR1) during switching.? And/or disconnect the RTTY line and CW line, those do change the
frequency (but not due to sideband).
Strange problem.
73,
Gary
WB6OGD
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