The K3 audio channel is designed for communications audio in a bandwidth of 5 kHz or less. There are a number of reasons for this.
Using the 13 kHz roofing filter doesn't change that. It does widen the IF passband and make the radio more susceptible to nearby, very strong signals. Think of it as a way to emulate the performance of high-IF radios with wide roofing filters :-) In addition, most PSK31 activity takes place in a 3 kHz or less window on most bands since that is what most SSB filters will pass in most radios. I almost always narrow the passband once I have a QSO in progress since a strong station coming on can activate the AGC and push down the signal I am trying to copy, or affect the soundcard input, etc. 73, Lyle KK7P _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
