Larry Wright wrote: > > > PLL Reference Osc Range Test yields 12.099 - 12.086 = 13 Khz range. > But the VCO Test yields 5.535 Mhz instead of the expected 10 to 12 Mhz > reading.
That suggests a band switching problem, or problems with the VCO band range capacitors or varicaps. Could you possibly have spun the dial to get on band, rather than used the bandswitches. If so, you may need to do a direct frequency entry. > > The K-2 receives every 5 Khz . The problem seems to me to involve the What do you maan by that (although it may be a symptom of not having calibrated the reference oscillator)? > 12 Bit DAC (U5). Have resoldered the pins to it. Pin 8 is 5v, but > pin 7 stays at 3.4v at all times. Pin 1 on U6 stays at 7.6v. (the 8v > Regulator output is 7.6v) The 7.6v output is present to the PLL ref. > osc circuit. Turning the dial has no effect on the output of the DAC. > The PLL Reference osc stays at 12.099 Mhz. But you previously said that the reference oscillator range check passed, which indicates that control voltage is being varied. I think this symptom arises from a failure to calibrate. -- David Woolley "The Elecraft list is a forum for the discussion of topics related to Elecraft products and more general topics related ham radio" List Guidelines <http://www.elecraft.com/elecraft_list_guidelines.htm> _______________________________________________ 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
