Ian, You are correct about the NE/SA602/612 mixer - it generally performs well, but is not the ultimate. Its biggest drawback IMHO is that the performance suffers in the presence of strong signals such as European SW broadcast stations. I have not encountered problem here in North Carolina, but I am 150 miles from the coast, and I would expect those in Europe would have a lesser opinion of the capabilities of the NE612 mixer.
Check out Wes Hayward's comments at the beginning of The "Western Mountaineer" article on page 12.7 of Experimental Methods in RF Design. Like everything else, the Gilbert cell mixer has its limitations. Diode ring mixers (as used in the K2) are much better, but require a larger LO input and are not be as adaptable to a simple front end receiver design. Compromises, compromises, compromises - that is the name of the game, one must trade off complexity, cost and performance every step of the way in a design. If one wants the ultimate, it will be complex (and likely much larger than the K1 or even the K2). 73, Don W3FPR > -----Original Message----- > > On Wednesday 07 February 2007 10:15, Sandy W5TVW wrote: > > You will find the receiver supurb during heavy QRM situations > like contests! > > ? with the first mixer being an NE or SA 602 or 612? > > The K1 is not a K2 lite: > domestic kittens, no matter how much fun they are, > don't grow up to be tigers. > > Ian, G4ICV, AB2GR, K2 #4962, LP-100 #278 > -- > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.441 / Virus Database: 268.17.39/686 - Release Date: 2/14/2007 7:54 AM _______________________________________________ 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
