Hi Benny, On the face of it your suggestion makes sense, for a little signal attenuation get back the lost IMD performance. Is it as simple as that ?
I have copied this to the reflector, so that others more knowledgeable about IMD than I might comment. 73 Stewart G3RXQ On Thu, 24 Mar 2005 23:11:20 +0200, Benny Aumala wrote: > > > Stewart, > > something KISS came across when playing with the prefilter idea and > simulator. > Voltage response, input impedance and return loss were in my interest for > close and > large-band frequencies. > > Put a 1,2 - 1,6k resistor across the filter input (between step-up and first > fiter). > Or place 200 ohm across input of step-up. > This gives good large band termination for post-mixer amp and drops the > signal 1 - 2dB instead of 5dB with resistive > attenuator. Then only part of pre-filter loss comes into play, and you can > enjoy the good IMD. > What say? > > Benny - oh9nb _______________________________________________ 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
