[Elecraft] Re： Solved - XV144, XV222, XV432

[Johnny Siu]

Thanks for good summary.  It was quite a huge investment in 3 transverters and 
certainly you would expect more value for money.  Your suggestions could be the 
manual errata.
 cheers, 


Johnny VR2XMC 




________________________________
寄件人﹕ Colin VE3MSC <ve3msc at cogeco.ca>
收件人﹕ Elecraft Reflector <elecraft at mailman.qth.net>
傳送日期﹕ 2011/1/15 (六) 10:35:27 PM
主題： [Elecraft] Solved - XV144, XV222, XV432

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


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