I hope I am not stepping on any toes - but I found someone who had designed a 13Khz +/- filter with some toroids and caps - incl variables to adjust and built two and they work great in main KRX3 - just confirmed again they give nice fidelity on AM - and I can hear the 6khz filter click in when I reduce BW to 3... low cost - fair bit of labour :-)
73 John VE3NFK Jerry, The WIDTH control sets the final audio bandwidth, which is limited to 5 kHz in AM mode. But in AM mode, the crystal filter bandwidth needed is 2x the audio bandwidth, or 10 kHz in this case, because it has to pass both sidebands. To obtain this full bandwidth, you'd have to have the 13 kHz FM filter installed. The AM filter is only 6 kHz wide (an industry standard), and if that's the widest filter you have, you're actually getting only a little over 3 kHz of audio bandwidth even if you set the WIDTH control to max (5 kHz). 73, Wayne N6KR On Mar 26, 2009, at 11:23 AM, Gerard Jendraszkiewicz wrote: > Hello, > > I have K3 with KFLA-6K. I can only adjust the width to 5.0 using the > width knob on the K3. I use AM to listen to the AM BCB and some SW. I > remember getting a wider width in the past ?? Any suggestions ? > > Thanks > Jerry, KE9I > > ______________________________________________________________ > 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 > > --- http://www.elecraft.com ______________________________________________________________ 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 -- View this message in context: http://n2.nabble.com/Width-of-AM-filter-tp2540204p2542146.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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
