I always assumed it was a 30 minute warmup, because I seem to remember the
alignment procedures spec 30 minutes warmup before doing an alignment.
Steve Wedge, W1ES/4
"I can't complain, but sometimes I still do."
- Joe Walsh
If the above message appears, it came from Steve's Son of Laptop!
----- Original Message -----
From: "Eddy Swynar" <[email protected]>
To: <[email protected]>
Sent: Friday, November 25, 2011 2:32 PM
Subject: [Drakelist] T-4X Stability
Hi All,
The manual for my T-4X states that stability is "LESS THAN 100 CYCLES
AFTER WARM-UP". My question is simply this: how long, exactly, is an
accepted period of "....warm-up"...?
After all of the hoops that I've jumped through in stabilizing the PTO in
my rig (re-buiding it almost, actually!), I decided this morning to
actually measure its drift. I used my ICOM 751A transceiver (in general
coverage mode) as the frequency "umpire", and tuned it directly to the
Drake PTO's output frequency of 5454.0-KHz. Both rigs were in the basement
overnight, where the ambient room temperature was 59F. I measured the
frequency a total of SIX times, i.e. (1) immediately at the start of the
test, (2) 3 minutes into the test, (3) 15 minutes into the test, (4) 30
minutes into the test, (5) 1 hour into the test, and finally (6) two hours
into the test...
Here are my results:
(1) 5454.0-KHz (cold start);
(2) 5454.0-KHz (unchanged from cold start);
(3) 5453.5-KHz (downward drift of 500-Hz from cold start);
(4) 5453.0 KHz (downward drift of 1-KHz from cold start);
(5) 5452.8-KHz (downward drift of 1.2-KHz from cold start), and,
(6) 5452.8-KHz (unchanged).
So---it looks like the rascal that I have here stabilizes after a good
hour of steady warm-up, which leads me to suspect that maybe "warm-up" to
the writer of the manual was, in fact, just that, i.e. one hour...?
No matter, it was a most interesting exercise---and I sure would be
curious if my rig's performance might match that of some of the other
T-4Xs that are out there...although I dare say, probably not everyone has
as thick a hide as I do in being able to withstand a 59F ambient room
temperature...! Hi Hi.
~73~ de Eddy VE3CUI - VE3XZ
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