>> I'm concerned about receiving on 40m here in Europe <snip> David,
Don't be confused by blow-by as in "conventional HF transceiver" where the crystal filter is used to determine final selectivity, in that case blow by is highly undesirable. With K3 in normal setup, any blow by through the crystal then has to make it past the DSP filtering after that which is highly unlikely. What's happening with this "trick" setup for AM SWL reception is you are centering the audio part of the powerful SWL broadcast into that 5 pole filter at it's center frequency and the blow by allows a little extra frequency fidelity, then the DSP has been opened up fully to accomodate and amplify (through RX EQ) what small amount of blow by there is. All of this setup is quite contrary to usual K3 setup and operation for ham band signals - where that 2.7 filter is more than adequate. In fact the numbers are rumored to be stunning. [Elecraft] K3 AM SWL - Stock 2.7 Filter David Cutter d.cutter at ntlworld.com Tue Feb 5 02:46:04 EST 2008 Don You mention blow-by to receive strong AM signals. Is the amount of blow-by covered by the specs? I'm concerned about receiving on 40m here in Europe where nearby broadcast stations are way above anything amateurs receive within other bands. David G3UNA _______________________________________________ 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
