Thanks Don. I triple-checked the inductor wires and they are well soldered to the pads. I also verified the value of the resistor across it, 5.1 Mohms. I reflowed the solder anyway, but no change in the BFO frequency range.
If L33 wasn't connected would the oscillator even run? If one of the two crystals was bad (or not soldered properly) would you also see a reduction in BFO range? What about if one of the varactors had failed? Any further advice will be greatly appreciated. Thanks and 73 Mike M. KU4QO On Sat, Sep 30, 2017 at 9:57 AM, Don Wilhelm <donw...@embarqmail.com> wrote: > Mike, > > The inadequate BFO range is usually a result of the L33 toroid leads not > being well soldered. The toroid wires are very fine and sometimes are not > visible to the naked eye, so use magnification to examine them. When > re-soldering, use a pointed tool to bring the fine toroid wires down onto > the solder pad instead of further up on the securing resistor lead. > > For adjusting the 4 MHz Reference Oscillator (that has nothing to do with > the BFO range), refer to the K2 Dial Calibration article on my website > www.w3fpr.com for the most accurate method of adjusting the Reference > Oscillator. > > Be aware that the 4 MHz Reference oscillator can drift in normal > operation, so soon after adjusting it, run CAL PLL and CAL FIL while it is > still "on frequency". That oscillator is not used in operation for the K2 > frequency display. In other words, simply adjusting the 4 MHz Reference > does nothing for normal operation. > > 73, > Don W3FPR > > > On 9/30/2017 9:35 AM, Mike Maiorana wrote: > >> 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. >> >> ______________________________________________________________ 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
