Hello all. I have a K2, 6000+ serial number, that I'm trying to get working correctly. Unknown history. A quick test showed the filters were not properly adjusted (could hear both sidebands of carrier on some bands). I thought it would be best to do a top-down alignment.
I adjusted the 4 MHz oscillator, verified the PLL reference oscillator range (12.43 kHz), VCO test and VCO alignment. No problems up to that point. I'm having an issue at the BFO test. The BFO high frequency is 4916.04 kHz and the low frequency is 4913.82 kHz. That's a difference of 2.19 kHz, well below the 3.6 kHz stated minimum. I verified the crystals at X3 and X4 were the correct type, along with the values of D37, D38, C173 and C174. I didn't see any PCB trace damage in the area. I reflowed the solder on those pins but didn't see a significant change in the BFO frequency range. I checked the VBFO control voltage and had 7.81 V at the high BFO frequency down to 0.00 V at the low BFO frequency. Any advice on how to move forward? Thanks and 73, Mike M. KU4QO ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
