I have two RA 1772 receivers both in excelent conditions, one of them
schould be equiped with 0.3 kHz cw filter (1.4 MHz). Unfortunately the 0.3
kHz filter does not exist on the board.
Where I can buy such filter, or if anybody can offer me a spare one?
Any help or suggestion welcome.
Jacek Kubiak
SP5DRH
[email protected]