One other possibility. The symptoms you're describing sound exactly like what I was getting when I got to BFO testing on page 65. Everything tested out perfectly (voltages, soldering, etc.) except that the frequency display was changing rapidly when I did the tests on page 65. The problem turned out to be the frequency counter probe. Although it's not emphasized in the instructions, the probe has to be built EXACTLY as shown in the manual (figure 6-14) -- especially with regard to which side of the crimp housing gets the braid and which side gets the center conductor. Once I rebuilt the probe, everything tested correctly. Jon KB1QBZ
--- On Tue, 12/23/08, elecraft-requ...@mailman.qth.net <elecraft-requ...@mailman.qth.net> wrote: Message: 12 Date: Mon, 22 Dec 2008 21:51:14 -0600 From: "Gary Auchard" <w0...@juno.com> Subject: [Elecraft] K2 building problem To: <elecraft@mailman.qth.net> Message-ID: <8a8d929f5c4f4c63984a6003e37a3...@garyapc> Content-Type: text/plain; charset="iso-8859-1" I've just finished the assembly of part 2 on the RF board and ran into a BFO problem during the testing on page 65 of the manual. All other tests have been right on the money to this point. When testing in the frequency counter mode the front display is changing rapidly when using the frequency counter probe inserted in TP2. If I tap the Band- button the display locks in at 4.91253. When I tap the Band+ button the display goes back to changing rapidly. I can measure a good solid reading at pin 6 of U11 telling me the BFO is working and the frequency displayed is 4.91253. I cannot get a reading for the BFO High Frequency. I've checked L33 and it's fine with no short caused by R116 being on top of it and has a good continuity across the windings. X3 and X4 are the correct crystals for that location and came from the package marked 4.91 MHZ. Anyone have an idea what the problem might be? Gary Auchard - WB0MNA K2 sn. 6506
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