Don, I followed your suggestions and I am still at the same place I started.
I began by following the schematic as you suggested and marked each component as I verified the correct values and type. I found no errors (at least I didn't but it doesn't mean I erred again). It appears I had a solder bridge between pins 4 and 5 on U6. I replaced D16 veractor MV209 and did not have another D17 ISV149 so the old one is still there. The readings remained virtually the same as before. The voltages at U6 pin 1 were as follows: High 12103.15, voltage 7.61; low 1209.03, voltage 3.74. Pin 8 of the thermistor board was 7.97 and pins 6 and 7 measured 3.96. Pin 1 measured 7.64. The line voltage at the power plug was 14.3 volts. I am curious why the voltage on the lower reading did not go to near zero. Would Q19 (J310), D17 be faulty and what effect does U4 have? I appreciate your time for leading this BOOF (burnt out old f-rt) through the dark. Thanks again, Dwight W4IJY K2 4766 -----Original Message----- From: Don Wilhelm [mailto:[EMAIL PROTECTED] Sent: Monday, August 21, 2006 9:17 AM To: C Dwight Baker; elecraft@mailman.qth.net Subject: RE: [Elecraft] Alignment & Test II Dwight, Don't be concerned about the setting of C22 until after you have finished the entire build - just set it to mid-position for now. You will want to re-do CAL PLL and CAL FIL after you are done with the 4 MHz oscillator set precisely to achieve good dial calibration. The K2 does not use the 4 MHz oscillator on a real time basis, only during CAL PLL and CAL FIL operations. Now in to your problem. Yes, your PLL high and low frequencies are too high and the range is too small. Turn your manual to the back and find the schematic for the RF Board - sheet 1. Then find the area in the left upper corner marked PLL Reference Oscillator. Check all the components associated with that circuit, especially the capacitors, varactors, and inductor L31 for proper values and make certain they are in the correct holes. Re-verify that D16 and D17 are correct - D16 is the larger bodied varactor and D17 is the smaller. After verifying the components above, go back to CAL FCTR with the probe in TP3, tap the BAND+ button and read the high frequency, then measure the voltage at U6 pin 1 (it should be near 8 volts). Then tap the BAND- button and read the low frequency and measure the voltage at U6 pin 1 (now should be near zero volts). Did you obtain a correct frequency range? Did the voltage at U1 pin 1 change from 8 volts to 0 volts? Let us know what you find. 73, Don W3FPR > -----Original Message----- > > When I did the PLL reference oscillator range test and at 4 MHz; the > readings are 12104.45 on the high end and 12099.20 at the low end for a > difference of 5.25 whereas the manual indicates the range should be > somewhere between 9.8 and 15 kHz. > > > > Adjusting C22 on the control board gives me a difference of 5.5 kHz. > > > > Where or what am I looking for or better yet have I goofed in > populating the > board? Phase I testing was good. > > _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
