K2 #7449 VCO alignment difficulty. Cannot get 4.0 MHz R30 voltage to change at all - it measures 7.97V. Have confirmed all the cap values, varicap diodes are correct parts, T5 wound and wired correctly.
Have scoped the area comparing to a second operational K2 & the wave forms look and behave the same as the rigs are tuned. The voltage on R30 is simply too high at 4.0 MHz. I set the K2 to 3.5MHz and adjusted L30 for the lowest voltage, this gave the following results: 3.50 4.14 4.00 7.97 7.00 4.39 7.30 6.30 10.00 5.08 10.15 5.86 14.00 3.84 15.00 5.98 18.00 4.42 18.20 4.67 21.00 3.83 21.45 5.38 24.80 5.92 25.00 6.40 28.00 4.64 28.80 5.66 (29.70 6.87) Should I continue the build or what else should I check? THANKS & 73, Rob KC2VMP ______________________________________________________________ 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
