[Elecraft] K2 VCO Alignment only 0.02V @ R30
JeremyJones
jjones9527 at gmail.com
Mon Feb 4 17:11:45 EST 2013
So Gary from Elecraft gave me some things to check today. Heres where I am
at for the moment.
T5 is back to 15 turns of red. This brings the frequency close to spec @
TP1.
Pulled C72 and measured its value at 273pF.
U6 has 4V @ pin5 and pin1 goes from 7.5 to 0V when doing the PLL range test.
T5 lead 3 is showing 2.4V
TP1 is reading 0.686V with the RF probe.
TP1 is reading 8179.89 @ 4000.10
There is 5V on both sides of RFC15.
Cal PLL gives me info 232 even with TP1 @11915.60 tuned to 7000.00
Seems I'm going in a bit of a circle, but thats how things are at the
moment. I'm letting the unit sit powered up for a while before I try Cal
PLL again.
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