Re: Best Filter for the K3 when operating PSK31

Posted by Julian, G4ILO on Dec 30, 2009; 10:52am
URL: http://elecraft.85.s1.nabble.com/Best-Filter-for-the-K3-when-operating-PSK31-tp4230438p4231772.html

Brandon673 wrote

I would like to hear opinions and reasons for the best filter to use for operating PSK31 with the K3.

You don't need anything more than the SSB filter. I agree with Don that to provide the best chance of copying a signal it's best to use narrow filtering around it but I would not go to the expense of buying a 200Hz filter just for PSK31 operation even though that is probably the mode I use most often. I have a 500Hz filter which I got for CW use which obviously comes into play when I reduce the bandwidth to 500Hz or less in DATA too. But its effect is hardly noticeable in digital modes (unlike CW where you have key clicks to contend with). I really feel that the DSP filtering does a good enough job for this application.

If you use a program that allows decoding of a wide swath of passband (PSK Browser or whatever) then it would be useful to have the AM filter which would allow you to open the receiver passband up to 4KHz.