Thanks Jim for the info and I will try and get back at it tomorrow.?
73, Jim VE1RB
Yes, you want to look at the 2nd IF/Audio board. CW operation is described towards the end of the text in section 2-11 of the service manual. In short the CW transmit carrier is generated by a crystal oscillator that is offset nominally 800 Hz from the dial frequency. The oscillator is keyed by Q1103 on this board.
More info on the oscillator is here:
On Sat, 1 Feb 2025 14:17:50 -0400
"Jim Harris via " <radiove1rb=[email protected]> wrote:
> Hi once again. I am back trouble shooting the TR7 with what I hope is the
> last problem. When I switch the mode switch to CW I get a 1800 cycle tone
> in the receiver that is over S9 in strength. If you change the frequency
> this tone does not change at all. I have a Version 2, 2nd I.F/Audio board.
> I have not found an explanation of how the CW operation works but maybe the
> problem is on that board. Anyone got any ideas? All suggestions appreciated
> and welcomed.
> Thank you, Jim VE1RB
--
73
-Jim
NU0C
