Thanks to many of you on the list, I have 3 pretty happy transverters. Heat problem - solved by replacing thermal pad between heat spreader and case. Use Thermalcote heatsink grease instead.
Scraped paint off the case under screw heads, using a cylindrical dremel bit, for all 3 XVs. Replaced the black screws with chrome or stainless on the XV432. This helped the output substantially. XV144 - the supplied crystal is out of range, and Elecraft will be replacing. Turns out they started using same one for XV144 and the internal K144XV. But XV144 will be more than 10KHz off, so you can't correct for it. I added a small series variable inductor between xtal and ground, and this helped me get it within 5KHz. You can't bend these crystals very far. XV222 - I removed L19, jumpered it out, and replaced C12 with a variable capacitor. Schematic says 12pF, assembly guide 18pF, and a variable let me get the frequency within a few hertz. XV432 - drilled a couple holes near U6 and jumpered top to bottom. There just arent enough vias on this board. Replaced my U6. Output now pretty stable. I still think PA Bias instructions in alignment are wrong for this unit. Fan wires would not go through the big via, so I soldered it at the diode on the top of the board. 73 VE3MSC Colin ______________________________________________________________ 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
