"Cop a Butchers at" - Sorry in English "Take a look at "
http://homepages.nildram.co.uk/~baker/K2_Overview.html 73 Stewart G3RXQ On Wed, 8 Nov 2006 11:26:03 -0500, Darwin, Keith wrote: > Since the NB occurs right before the existing Xtal filter, adding more > > filtering in the NB slot would increase the skirts of the filter, but it > wouldn't do a whole lot more. In other rigs with 2 filters, they are at > different IFs and have other stages between them. Having a 2nd filter > earlier in the signal chain helps to protect the RX from out of band > signals. > > The K2 already does that by having the only filter be as early as > possible. > > But, a cool option would be to have a narrow SSB filter that could go in > that slot. That way you could configure your SSB adapter to have a wide > Xtal filter for good sound and then add the narrow one for contests and > tough band conditions without having to resort to the variable CW filter > (which performs poorly at wide bandwidths). > > Of course, if you can live without your NB. I certainly can. > > - Keith N1AS - > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of N2TK, Tony > Sent: Wednesday, November 08, 2006 10:32 AM > To: [EMAIL PROTECTED]; elecraft@mailman.qth.net > Subject: RE: [Elecraft] K2 Roofing Filter? > > Don, > Wasn't there talk a while back about someone replacing the Noise Blanker > with another crystal filter? If it was switchable, like switching in and > out the Noise Blanker, would that add to the shape of the skirts in the > present crystal filter? Not sure about making up for any loss in the > added filter though. Maybe set up this added filter for CW (400-600HZ) ? > > I still haul the K2 down to WP2Z. > 73, > N2TK, Tony > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Don Wilhelm > Sent: Wednesday, November 08, 2006 10:15 AM > To: Joe-aa4nn; elecraft@mailman.qth.net > Subject: RE: [Elecraft] K2 Roofing Filter? > > Joe, > > To generalize - 'roofing filter' would be placed right after the first > mixer for best effectiveness to strip off extraneous mixing products. > > The K2 is a single conversion design and the IF filter is placed right > after the first mixer (there is a post-mixer amp there for good dynamic > range) - so it serves both as the IF filter and the 'roofing filter'. > > In other words, yes a roofing filter 'does not compute' for a single > conversion design. > > 73, > Don W3FPR > >> -----Original Message----- >> >> In view of this, and excuse me for not being an engineer in receiver >> design, why is there not a roofing filter option for the K2. Is it >> just not possible in a single conversion rig? >> de Joe, aa4nn >> > > _______________________________________________ > 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 > _______________________________________________ > 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
