All the components look right. I guess I've got the dreaded high Q crystals. I've noticed in the Elecraft archives that it is possible to put a capacitor at the junction of X3/X4 to ground. Which is the preferred method?
Thanks. > > From: "Don Wilhelm" <[EMAIL PROTECTED]> > Date: 2005/12/07 Wed AM 09:30:04 PST > To: <[EMAIL PROTECTED]>, > <elecraft@mailman.qth.net> > Subject: RE: [Elecraft] K2 BFO Test > > Ted, > > Yes, you should get the BFO range and frequency correct - you can continue > with no extra effort, but it must be resolved eventually, and there is no > time like the present to do it. > > Check the values of the capacitors C173 and C174, and while you are at it, > check C169 too. Additionally, check the varactors D37 and D38 for the > correct type (1SV149 - the smaller ones) qne proper orientation. Be certain > the BFO crystals were the ones you soldered in - they are typically marked > ECS D4.91 -S > > If you find all the above correct, you may have to pad Capacitors C173 and > 174. Should that become necessary, use 47 pf in parallel with C174 and 120 > pf in parallel with C173. The padder capacitors will lower the low > frequency end more than the high frequency end of the range, so it should > work for you - but do the padding only if there is nothing else wrong with > the components. > > 73, > Don W3FPR > > > -----Original Message----- > > > > I am in the process of testing the BFO on page 62. Everything > > tested fine up to this point but now I can not get the proper BFO > > range. The BFO high frequency is 4917.56 and the BFO low > > frequency is 4914.26. This provides a BFO range of 3.2 kHz. It > > appears that I can not the the BFO low frequency below 4912.7 as > > specified in the manual. I checked L33 to make sure R116 is not > > shorting any turns. Should I troubleshoot this problem before > > proceding? If so where else should I look. Thanks. > > > > Ted K6OI > > > _______________________________________________ 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
