XV-144 with high NF?

Posted by Bob DeVarney W1ICW on Dec 05, 2010; 11:36pm
URL: http://elecraft.85.s1.nabble.com/XV-144-with-high-NF-tp5806265.html

I an wondering if anyone has encountered this before.
I have a recently built ( this spring ) XV-144 external transverter
teamed up with my elderly K2. The K2 was updated to all the most recent
mods, builders alerts, and firmware upgrades as of mid April.
The transverter has a high noise figure in the neighborhood of 10 dB
when measured with a known ENR noise source and either the VK1OD of
G8KBB noise figure software.
I have also measured the transverter using my Kenwood TS-2000 as an IF
rig and have similar results.

Before I yank the covers off and get out the magnifying glass, can
anyone point me in a good direction?

I set C1 for a noise peak at 145 MHz per the manual, but the RF amp bias
would not go above 220 mV at TP 2 so I suspect something in that area.

Thanks in advance,

Bob W1ICW

--
Sooner or later, buying crap you don't need with money you don't have grinds to a halt." Jeff A. "
"...the thought of owning a better piece of test equipment is usually sweeter than the reality of it." maynardb

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