Many thanks for the rapid reply, Don! Good to know this isn't normal, and I will certainly follow your advice and check the front panel assembly carefully, especially the solder. When I initially checked things with an optical loop, the solder appeared to be bright on both sides of the PCB (at least for things I could see). I did use a 700 degree tip on my Weller WTCPT Iron and standard Kester 44 solder, so the potential for decent soldering is there at least.
Even though the second CPU on the filter board is mostly inactive, no telling what internal loops are going on that might result in it turning that 4 MHz resonator into a periodic signal. So I'll be sure to check around that too. Of course at this time in the assembly process, the Filter Board is not screwed down. Don't know if that is a source of noise or not. I'm also curious what the AGC_OFF signal is doing on that board. I'll investigate that later. Given that it is appearing in the audio chain (or at least post demodulator), I am suspecting the noise is propagating over the internal power rail. Figures I'd have an interesting problem. Thanks again! 73, Bob, WB4SON ______________________________________________________________ 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 Message delivered to [email protected]
