I am hoping that Elecraft will have a different option for AM listening by the time that my K3 arrives (in April). Perhaps the roofing filter can be bypassed for AM listening. There are several radios out there that have DSP-only selectivity for AM reception: RX-320, Jupiter, etc. (Which also applies to transmitting on those radios). I purchased the 6kHz AM filter, but now I realize that the 15kHz FM filter is better suited for full-fidelity AM listening. The 6kHz filter may not see much use, even if I were to transmit on AM.
According to the ARRL web site, 9 kHz is the ARRL's recommendation for double-sideband AM. A typical AM Broadcast signal's BW is 10kHz. Passing these signals through a 6kHz filter will result in a restricted-audio sounding signal. This is good for AM ham reception on the crowded 75m band but it is not full-fidelity sounding on AM BCB or SW. (I have heard some SW stations that must be using a wider bandwidth than 10kHz, based on how nice they sound on an old Hallicrafters radio - the kind with just the IF transformers for selectivity. Radio China International comes to mind). 73, John W2XS -- View this message in context: http://www.nabble.com/New-K3-SN-207-built-but-question-on-AM-Filter-tp14780362p14805922.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ 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
