In message <[email protected]>, Steve Rawlings
<[email protected]> writes

QRM at G8RW
-----------
Recent letters from G8RW describe continuing QRM problems on 136
kHz from an NTL cable television interface installed in a
neighbour's house.  Bob has gone to great lengths to reduce this
continuous source of S9 QRM.  He has set up a new antenna feed
arrangement, and designed a remote tuning system to get the
antenna feedpoint away from the house.  But the received noise is
still very strong, such that even G4CNN is only just audible
above the noise.

I should imagine that a noise canceller, with phase and noise gain
controls would be effective here - "an LF version of the JPS ANC-4"
Has anyone built such a device for 136kHz/73kHz?

Alan, G3XZX