Lee -
Could be an issue specific to your rig. Either that or my set is an
anomaly: I have no trouble being on-freq on SSB with my B's and I haven't
touched C61 in several months.
On CW, I still have trouble getting stations to hear me calling, and I'm
starting to wonder if it's more than just my preference for a low beat-note.
Steve Wedge, W1ES/4
Live free or die: Death is not the worst of evils.
John Stark.
All my computers have my signature with various pearls of wisdom appended
thereto.
--------------------------------------------------
From: "Kihwal Lee" <kih...@yahoo.com>
Sent: Thursday, January 05, 2012 4:17 PM
To: <k4...@mindspring.com>; "Larry Mccabe" <lmccabe...@aol.com>
Cc: <drakelist@zerobeat.net>
Subject: Re: [Drakelist] r4c pto drift obsevation
I once fed my R-4A (the 11 tube version) a premix signal from a stable
modern
signal source to see exactly that. I don't know which, but the BFO and/or
the
5995 Kc LO was drifting at least couple of hundred Hz over the testing
period.
I personally do not care too much about the PTO drifting as long as it is
usable
after proper warm up. But carrier/LO/BFO going out of sync between T-4X
and R-4A
is inconvenient to say the least. I do have a color-matched pair, but
they
still tend to go separate ways even after hours of warm up. Even with
this
issue, I have no plan to "upgrade" to T-4XC/R-4C. hi.
73s,
Kihwal, K9SUL
----- Original Message ----
From: Garey Barrell <k4...@mindspring.com>
To: Larry Mccabe <lmccabe...@aol.com>
Cc: "drakelist@zerobeat.net" <drakelist@zerobeat.net>
Sent: Thu, January 5, 2012 1:59:37 PM
Subject: Re: [Drakelist] r4c pto drift obsevation
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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