Since the AM transmit function is implemented in DSP, it should be clean and band limited anyway. I don't see why it would not be possible to enable the 13 KHz filter for AM transmit.
As far as image rejection goes ... even if the FM filter has a shape factor of 2 (and it should be 1.5 or so) the image response would be down more than 60 dB unless there is a lot of circuit leakage (filter blow-by). 73, ... Joe, W4TV > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Dan Atchison > Sent: Saturday, June 28, 2008 7:51 AM > To: elecraft@mailman.qth.net > Subject: [Elecraft] Re: [K3] Transmit AM through FM Filter? > > > Thanks for all the answers. To set the story straight, the reasoning > behind the question was not to determine if I could transmit "hi-fi" > AM, it's simply a matter of cost. At $125 a clip for an AM filter and > the fact that I may only transmit AM once or twice in a lifetime, I > couldn't see the extra cost to add the AM filter if TX through the FM > filter worked. > > Since others have already identified that a filter can be > "fooled" into > thinking it's a different bandwidth, I do have a plan that I'll try > somewhere down the road. Looking at the schematics it appears > to be an > easy solution that I can use an empty filter spot and diode > switch (add > two diodes) that position into an FM filter consumed location. That > empty spot would be designated as the AM filter spot. > > Yeah, I know, it's only $125, but I'm a cheapskate. > > 73, > Dan -- N3ND > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > 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: Elecraft@mailman.qth.net 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
