I have one of those old QF-1 filters sitting in a drawer. I bought it new years ago. It was certainly a lot of fun notching a signal then switching it to peak and narrowing it down. And a very effective accessory for my rig at the time, a Century-21 which had no such refinements.
I should give it a try with the K3. It is kind of a pain because there is no bypass switch in the unit: it has to be powered on to hear anything. Also a noticeable AC hum which was apparently a standard feature of these units. 73, Drew AF2Z On Sun, 16 Aug 2009 13:03:37 +0000, Brian/K3KO wrote: >Unlike the phone guys, most CW guys could care less about audio >distortion or quality for that weak one. They just want to be able to >copy it. The information is in the off's and on's, the rest doesn't >matter. > >The old QF-1 Q-muliplier had an advertised Q of 4000 @ 455KHz. That's a >bandwidth of about 100Hz. There was some skill requiring adjusting >several knobs to make it work for you. Of course, any K3 implementation >would have to be knobless. > >73 de Brian/K3KO > ______________________________________________________________ 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
