Dear Elecrafties, Thank you for your very helpful feedback suggestions, particularly those who directed me to look for gremlins in the bandpass section of the subRX as the most likely cause of intermittent subRX operation on 40m. As suggested I took a close look at the soldering on the enamelled wire leads from the 40m toroids and sure enough found the solder does not appear to have flowed properly along the leads on the component side of the board, perhaps due to incomplete cleaning of the enamel from the wire? That does look suspiciously like a gremlin hideaway. Unfortunately, it's not feasible to clean or resolder the toroids from the component side without first removing some of them as they are quite tightly packed. The reverse side of the board showed no obvious signs of dry joints but I spruced up the 40m toroid solder pads there just to be sure. So far so good: the radio is all back together and 40m works fine on both the main and subRX. Fingers crossed.
The 20m toroids appear to have the same limited solder flow on the component side so I'll keep a close watch for gremlins there too ... For those of you currently building the subRX, I'd suggest a careful look at the soldering of the bandpass toroids for possible gremlin droppings before putting the subRX board into its aluminium box. 73 all and thanks again for the rapid diagnosis. You guys rock. Gary ZL2iFB ______________________________________________________________ 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
