I didn't mean to imply that 59 was room temp - it's been a long time since I
lived in New England ;-) I did used to have my shack down cellar when I
lived up there, and 59 would be warm in some instances before the baseboard
heat came up to heat the place. Obviously, you must allow for more. I
suspect I took the question more as "what is the defined warm-up time"
rather than trying to figure the extra time needed for a "cellar warm-up".
I do miss my "cellah" here in NC, but have adapted. With the kids gone, the
"den" on the first floor has become my shack. My XYL is extremely tolerant
these days with all the Drake rigs in various states of disassembly strewn
across the floor behind my operating position, and that I have to use the
island in the kitchen as my rework station :)
The B-line is getting a break for the rest of the weekend as I dabble in
CQWWCW with my K3. I had thought of putting the Drakes on, but I sold my
W1WEF keying interface when I got the K3 - thinking I didn't need it.
I'll be taking a break for the contest and other stuff tomorrow at 4 to try
and check in to the net.
Steve Wedge, W1ES/4
I swear by my life, and my love of it, that I will never live for the sake
of another man, nor ask another man to live for mine.
-Ayn Rand.
All my computers have my signature with various pearls of wisdom appended
thereto.
--------------------------------------------------
From: "Garey Barrell" <[email protected]>
Sent: Friday, November 25, 2011 5:57 PM
To: "Steve Wedge" <[email protected]>
Cc: "Eddy Swynar" <[email protected]>; <[email protected]>
Subject: Re: [Drakelist] T-4X Stability
Steve -
I think 30 minutes is a reasonable 'warm-up' time. IF the radio is in a
controlled environment.!! Take one out of the garage in winter and plug
it in, it's gonna take considerably longer before everything reaches
equilibrium. You have some sizable chunks of iron and steel in there that
can absorb quite a bit of heat. From 60 degrees to a 'nominal' 75 degree
ambient on top of normal internal heating would take a while, perhaps an
hour?!? :-)
Plus as Evan said there will be a delta from transmitting as well. A fan
makes a BIG difference in this if you are into long transmissions or TTY,
etc. This is one reason why the TR-7 fan is used to exhaust hot air from
the PA right out the back rather than blow it in all over the radio,
including the PTO, with each transmission.
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>
Steve Wedge wrote:
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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