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,
.
-Ayn Rand.
All my computers have my signature with various pearls of wisdom appended
thereto.
--
From: "john"
Sent: Tuesday, November 29, 2011 9:30 PM
To: "Robert Fish" ;
Subject: Re: [Drakelist] T-4X Stability: EPILOGUE (Almost
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 exercis
" 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
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
Oscillato
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 (
st@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! * :
>
st@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!
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
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 t
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 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 c
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, ther
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
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