Hi All,
Well, this morning I essentially duplicated my previous stability tests with
the Drake T-4X here, only with a minor change: as was suggested to me earlier,
this time I let the umpire rig---my ICOM 751A transceiver---warm-up, alone,
for a full hour...
Before getting to the results, I
Nice work Eddy.
I do my tests a little differently, I look at overall stability by zero
beating WWV.
Regardless, my early T-4X (5KHz markings) is also just about 1.2KHz.
But my slightly newer R-4A (13 tube, but 25KHz markings and vernier Preselector)
is worse at just about 1.5KHz.
IIRC, there
Hi Eddy -
Would you be up for one more test run??
I wonder what would happen WITHOUT the fan. Certainly the interior would warm up faster. A
trade-off would 'perhaps' be a larger delta t from transmit to receive. Especially without an
ambient air of 59F constantly being pulled through the
Hi Eddy:
Excellent! Now, you might also learn something worthwhile by doing the
same test, but measuring the drift of actual output after mixing at say
7 or 14Mhz. If the crystal Osc goes the other direction, it might get
somewhat better...then again if it goes the other way...well...! :)
Hi Garey,
An EXCELLENT idea...!
I'm doing exactly that, even as I type this...
Stay tuned!
~73~ de Eddy VE3CUI - VE3XZ
**
On 2011-11-29, at 9:26 AM, Garey Barrell wrote:
Hi Eddy -
Would you be up for one more
Hi Curt,
A sort of an elaborate ...temperature-compensating-oscillator-heterodyning
scheme...! Hi Hi
We could call it The Rube Golberg method of frequency stabilization!: )
~73~ de Eddy VE3CUI - VE3XZ
<cptc...@flash.net>Cc: drakelist@zerobeat.net Subject: Re: [Drakelist] T-4X Stability: EPILOGUE Hi Curt,
A sort of an elaborate "...temperature-compensating-oscillator-heterodyning" scheme...! Hi Hi
We could call it "The Rube Golberg" method of frequency stabilization!
@zerobeat.net
Subject: Re: [Drakelist] T-4X Stability: EPILOGUE
*/Hi Curt,/*
A sort of an elaborate
.../temperature-compensating-oscillator-heterodyning/ scheme...! Hi Hi
We could call it */The Rube Golberg/* method of frequency stabilization! * :
)*
*/~73~ de Eddy VE3CUI
Hi Again All,
At the specific suggestion of Garey, I went ahead completed a 3rd stability
test on my Drake T-4X transmitter PTO...
I essentially repeated everything that I did in the very first test, i.e. I
used the ICOM 751A as an umpire, both it and the T-4X were started at the same
time
Eddy -
Great info. Actually this confirms what I would expect to happen. What you do with the fan is
provide a constant temperature, whatever it is, much better for short-term stability.
The other oscillators involved in the output frequency are the Carrier Oscillator and the Band
This has all been a most interesting exercise, nonetheless---I only
hope that my ramblings herein have NOT inspired readers to unsubscribe
from the list..!
On the contrary, Eddy. I find this stuff fascinating. The most
productive learning environments always have people who say things like,
I'll second that... it's epics like these that make this and other lists
worth riding along with.
Thanks for taking the time, and thanks for the info. I always knew fans
were a good idea :-)
John K5MO
At 01:47 PM 11/29/2011, Robert Fish wrote:
This has all been a most interesting
On Tue, 29 Nov 2011 13:25:27 -0500, Eddy Swynar wrote:
It's obvious that proponents of utilizing cooling fans for their Drake
transmitters are on to something, alright---but the benefits are NOT
restricted merely to prolonged tube life: PTO drift is reduced by one third,
as well.
This, I
computers have my signature with various pearls of wisdom appended
thereto.
From: Eddy Swynar
Sent: Saturday, November 26, 2011 8:13 AM
To: captc...@flash.net
Cc: drakelist@zerobeat.net
Subject: Re: [Drakelist] T-4X Stability
Hi Curt,
Wow...!
What I really wanted to do here
of Laptop!
- Original Message - From: Eddy Swynar deswy...@xplornet.ca
To: drakelist@zerobeat.net
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
, 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
@zerobeat.net
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
...@flash.net
Cc: drakelist@zerobeat.net
Sent: Sat, 26 Nov 2011 13:13:18 - (UTC)
Subject: Re: [Drakelist] T-4X Stability
Hi Curt,
Wow...!
What I really wanted to do here, primarily, was to validate my fix of the
Drake PTO that's been practically driving me to drink here lo these past many
:57 PM
To: Steve Wedge w1es1...@earthlink.net
Cc: Eddy Swynar deswy...@xplornet.ca; drakelist@zerobeat.net
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
computers have my signature with various pearls of wisdom appended
thereto.
--
From: Garey Barrell k4...@mindspring.com
Sent: Friday, November 25, 2011 10:07 PM
To: captc...@flash.net
Cc: drakelist@zerobeat.net
Subject: Re: [Drakelist] T-4X Stability
signature with various pearls of wisdom appended
thereto.
From: Eddy Swynar
Sent: Saturday, November 26, 2011 8:13 AM
To: captc...@flash.net
Cc: drakelist@zerobeat.net
Subject: Re: [Drakelist] T-4X Stability
Hi Curt,
Wow...!
What I really wanted to do here, primarily, was to validate my fix
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,
- Original Message -
From: Eddy Swynar deswy...@xplornet.ca
To: drakelist@zerobeat.net
Sent: Friday, November 25, 2011 11:32 AM
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
: [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
!
- Original Message -
From: Eddy Swynar deswy...@xplornet.ca
To: drakelist@zerobeat.net
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
At 02:32 PM 11/25/2011, Eddy Swynar wrote:
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.
Good God man, close the windows when you're measuring drift!
:-)
John K5MO
appears, it came from Steve's Son of Laptop!
- Original Message - From: Eddy Swynar deswy...@xplornet.ca
To: drakelist@zerobeat.net
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
, it came from Steve's Son of Laptop!
- Original Message - From: Eddy Swynar deswy...@xplornet.ca
To: drakelist@zerobeat.net
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
I wish my HQ-140X was this stable ... and has been said ... 59 degrees ...
yikes ... hell even I don't function well at 59 degrees..!!
Bill, W0LPQ
___
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, it came from Steve's Son of Laptop!
- Original Message - From: Eddy Swynar deswy...@xplornet.ca
To: drakelist@zerobeat.net
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
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