Sometimes turning on the preamplifier makes a world of difference, even when low threshold is selected. I realize that the preamplifier is not needed on the lower frequency bands and normally would be turned off to preserve the dynamic range of the receiver. But this is a case where raising the overall signal levels above normal helps the KNB2 to suppress the noise much better. In my experience it often brings otherwise inaudible stations up to Q5 copy.
I've not been following the thread. My apologies if others have already mentioned this. Ron AC7AC -----Original Message----- Many thanks for all the suggestions! Since it is easier and quicker to take the radio to a dimmer switch than it is to remove the covers and scratch the top of a transistor, I shall do that first! I am beginning to think that I was expecting too much from the circuit, and that being elecraft it would somehow squeeze the laws of physics a bit! 73 Stephen G4SJP _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
