I am using the procedures in a Rev C manual, Appendix E, Page 10-11 to troubleshoot a "dead receiver" problem. All Rework Eliminators are installed. Signal tracing through the PLL/VCO and Low-Pass Filter, Bandpass Filter, and T-R Switch produced expected measurements. In the Mixer, I.F. Amp, and Xtal Filter section, some anomalies were found. Specifically, the 2nd Crystal Filter Output measured at U11 pin 1 expects 0.27Vrms but measures only 0.17Vrms (paragraph 9). The Product Detector Saturated Output measurement expects 0.58Vrms but measures only 0.08Vrms (paragraph 10). These measurements produced with input of 0.15Vrms as measured at U12, pin 8 per instructions in paragraph 8.
I reheated solder joints on all components around these sections with no change of measurements. Any help appreciated. Regards, Jim Brown, K5JAZ ______________________________________________________________ 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
