I've gotten to Alignment & Test, Part II RF Board build on my K2 # 5422.
I seem to be having problems with "VCO Alignment" problems: a. 4 Mhz Oscillator Calibration = gave a reading of 12099.35 - OK it appears. b. PLL Reference Oscillator Range = 12099.32 high, to 12085.65 low - Range = 13.67khz - seems OK c. VCO Test: Frequency counter probe to VCO Test Point TP1. I got a frequency counter reading of 8913.18, seemingly stable - and OK. I'm trying to do VCO Alignment, and adjust Inductor L30 - to adjust and measure the VCO control voltage for proper range. I'M NOT SURE WHAT THE RELATIONSHIP IS BETWEEN "CHANGING BANDS" using the BAND+ and BAND- buttons, or changing the displayed frequency using the VFO KNOB? Which am I supposed to use? At one point, I could not get into the "80meter band" with the BAND- button, without lowering the displayed frequency down to near 40 meters or lower. VCO Alignment - requires going from Band 80 to 40 to 30 to 20 to 17 to 15 to 12m to 10m. DOES THIS MEAN TO DO IT WITH THE BAND+ switch or with the VFO Knob? I tried the VCO Voltage Readings - using band/frequency changes with the VFO Knob. But then when I tried to get the low freq and high freq voltage measurements - I seemed to be getting a steady stream of "8 volts DC"? HELP - can someone give me a hint on how to attack these VCO ALIGNMENT FREQUENCY CHANGES and measurements? Thanks, Fred Osborne N3CSY FL 4/22 __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ Elecraft mailing list Post to: [email protected] 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
