Don This doesn't quiet make sense to me. I have the 6khz filter in my K3. The BW indicated on the K3 is 5Khz. If I add the 12 KHZ filter and the K3 still says 5KHZ and that 5KHZ is the "audio" bandwidth, what good have I done? Most any old SW receiver sounds a bit muffled at only 6khz bandwidth. Opening them out to 10 or even 15 KHZ always makes them sound better. Yes I know the BCB stations are limited to 5 Khz but just compare the K3 to a wideband rx and note the difference. Steve Ellington [email protected] ----- Original Message ----- From: "Don Wilhelm" <[email protected]> To: <[email protected]> Cc: <[email protected]> Sent: Sunday, May 03, 2009 2:01 PM Subject: Re: [Elecraft] Shortwave filters for K3
> Bill, > > The 5 kHz width indicated for AM is the *audio* bandwidth, not the IF. > The IF bandwidth must be more than 2 times the audio bandwidth for an AM > signal - so your 12 kHz filter is good. > > Remember that the 6 kHz filter must be used for AM transmit. > > AFAIK, most broadcast stations limit their transmitted audio to 5 kHz, > so you are not likely to obtain much better fidelity than the K3 DSP > currently allows. > > 73, > Don W3FPR > > Bill Maddock wrote: >> Guys, >> >> Just got done assembling my second K3 and this one has a 13 Khz >> filter where #1 had 6 Khz - I like to do shortwave listening - thought >> the wider filter would give better fidelity, but DSP only goes >> 5Khz wide is there a mode for this? I assumed with the 13khz roofer >> it would be opened up to 10 khz or more? >> >> Thanks and 73, >> >> Bill N4ZI K3 #1059 & K3 #2914 >> >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
