I'm enjoying building K2 #7076 and have made it to the Alignment and Test, Part II section on page 63 of the revision H manual.
I've completed the 4MHz Oscillator Calibration check and the PLL Reference Oscillator Range Test and the K2 is within expected spec. For the 4 MHz Oscillator Calibration the counter reading was 12098.69 with regular fluctuation 10-20 Hz or so. Is that okay or a sign of trouble ahead? Wasn't sure whether this was what the manual meant by 'changing rapidly' and whether the readout needs to be rock steady or not. I've used both an external frequency counter and a K3. The signal sounds solid to my old ears! Assuming it was okay I proceeded on to the PLL Ref. Oscillator Range Test. This yielded a range of 12.46 kHz - within acceptable range from 9.8 - 15 kHz. However the VCO Test on page 63 results in a frequency of 7470.10 instead of one within the acceptable 8 - 10 MHz range. It's not clear which parts of the troubleshooting advice apply at such an early alignment stage. I've checked and re-checked components and solder joints in the PLL Reference Oscillator and the PLL Synthesizer parts of the board. So I'd like any advice about what I need to check or do to get the VCO Test to land within the correct 8 - 10 MHz frequency range. Most advice I could find via searching previous email discussions was about the VCO Alignment which is the next stage, but I figure I need to get over this hurdle before that next one. 73 Stephen VK2RH ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
