Blast ! you got there before me Dave. I have been modeling some suitable LC filters, but as you say they are a bit wide for transmit. However looking back in my log shows that I haven't had an AM QSO for 10's of years, so it's unlikely I will have one now. :-)
73 Stewart G3RXQ On Mon, 5 May 2008 11:01:13 -0400, Dave Martin wrote: > On 5/5/08, Stewart Baker <[EMAIL PROTECTED]> wrote: >> Why not an LC filter for AM reception instead of an expensive >> crystal roofing filter ? >> > That's what I did. I cut a scrap of PC board to the size of a filter > and used three toroids with tuning and coupling caps. It worked just > fine in position one, set up as 13 KHz. The DSP hasn't suffered at > all. Maybe with more antenna gain one might see some overload from > nearby signals, but not with my modest wire. I sure wouldn't transmit > with it, though. It's hugely wide, offering no attenuation of > unwanted mixer products. > > Dave W5DHM > _______________________________________________ > 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 _______________________________________________ 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
