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.