Hi, Rik. Then use a 250 or 500 Hz BW pass band filter. Engage the notch filter. Get an MFJ 1026 and null him out. Use a separately rotatable loop antenna for receive. There are a number of things which will work, either by themselves, or together.
We have or can get filters and other tools. That is a good thing, since no law of physics confers immunity from strong stations a KHz away, either down the block or across the ocean. Imagine, if you will, someone trying to work 3 KHz wide narrow-band FM at 3975 KHz; the SSB signals would render his receiver useless. That's our situation, unless we improve our receivers and do what it takes to live in a crowded band where different modes must coexist with each other. Cortland KA5S > [Original Message] > From: Rik van Riel <r...@surriel.com> > > Cortland Richmond wrote: > > Sound card users' preference for bandwidth wide enough to receive fifty or > > more signals is what makes us vulnerable. W1AW does NOT wipe out the "80m > > psk31 sub-band;" its CW signal occupies perhaps 50-100 Hz. Use a narrow > > filter, and a front-end able to handle nearby strong signals, and the > > problem goes away. Use PBT,even and put W1AW off the filter skirts. > > Here in southern New Hampshire, W1AW is S9+40. > > Typical psk31 signals are anywhere between S2 and S8 here. > > To get W1AW suppressed by >50dB means moving the filter far > enough away that only a small part of the psk sub band > remains.
