[Elecraft] XV432 Frequency and Power Stability

[Stu2]

Hi All,

I finished assembling a XV432 transverter and seem to have a little 
problem with both power and frequency stability. After going through the 
alignment steps, the power starts dropping from 20W down to about 10 
after sending CW into a dummy load for 20 seconds or so. During this 
time, the frequency drifts about 100 Hz. (Enough to detect a pitch 
change in another receiver.)

I installed Q1 using the Teflon spacer. I have the crystal oven 
installed and the transverter was powered on for about 30 minutes or so 
before I aligned it. (JP9 is on 4-5.) The part values appear to be 
correct. The problem appears if I use a 5W source or a 1 milliwatt 
source. (Changing JP3,4,5,6 accordingly.) My radio is a SDR-5000A.

The power module doesn't get warm.

I do NOT have the extra 5 turn coil and the 10pf capacitor installed on 
the power module. (Rev C1 errata.)

Has anybody else had this problem and if so, how did you fix it.

Thanks!

Stu
W7IY