[ICOM] IC-765 circuit help needed

[Rick Mintz]

Hi gang,

In my 765 I installed a FL-53a (250 hz, 455 kHz) filter and applied the mod to allow access to this filter in RTTY mode. When using this filter, I find the center frequency has been shifted about 50 Hz lower. For use in RTTY contesting, it is not convenient to have to adjust the R.I.T. to shift -50 Hz each time using this filter.

I have the Icom 765 Service manual but not the expertise to know what to adjust. Any guru's out there that can advise me what adjustment is needed to align the FL-53a with the rest of the filters?

Thanks!

Rick W1TY/W2RTY