Larry -
That is interesting.... I've never experienced it, as my shack has always been air conditioned.
The PTO coil is pretty well sealed, and I wouldn't expect it to be susceptible to humidity. The
only other sources would be the BAND oscillator, crystal controlled with a lacquered transformer,
the 3rd Mixer LO, also crystal controlled, and the BFO. The BFO is just an 'IF Can' style coil, and
would be the most likely suspect.
Would be interesting to see which of these oscillators is actually the one(s)
moving.!!
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Larry Mccabe wrote:
i've noticed some interesting drift characteristics on my r4c. i live in
florida.. shack in the garage.. during the summer months , with 80-90 deg temps
and high humidity, the r4c drifts approx 50 hz per hour. during the winter with
50-60 deg temps and reduced humidity the drift is reduced to 10 hz per hour .
in both cases these measurements were observed after a lengthy warm-up period
using a digital display counter. i have no internal fan or aux cooling in the
radio. only significant change in the vacinity of the pto is the sherwood audio
amp mod . temp and humidity obviously a significant factor in dealing with
drift. i know this is no big revelation.. thought the differences were
interesting though.
Larry WA0QHF
Sent from my iPhone
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