David,
10w is 7.3 kwH/month. I would doubt that is a large expense, even in
GB. Locally, its about 8 cents/kwH but in the bush it might be as
high as a couple dollars since diesel fuel for the generators costs
are huge (local diesel is $4.10). I know it would require conversion
to liters and all that to come up with equivalent costs, but most
households run hundreds of kwh/mo. Leave your TV plugged in but
turned off and it still consumes about 50w. I have plug strip to
remove ac from all my home TV systems when not in use. I leave power
to the satellite receiver as it keeps the LNB powered and stable
(Otherwise it takes 5-10 minutes to acquire signal and download data
at startup).
Simple solution is to leave the reference oscillator running
continually. The K3 TCXO-3 will still drift on power up but this is
compensated by EXREF every 4-seconds so frequency stability is held
to better than 0.1 ppm. I measured +/- 2 Hz at 28-MHz on my K3. But
if you watch the REF*CAL frequency you will note it incrementing from
49.380.000 to something like 49.380.080 in several minutes and then
settle down near that value (indicating start-up drift has stopped).
By not running your reference full time you will have to wait 15 to
30 minutes for it to fully warm up. I also have a rubidium but run
it only for precise frequency calibration of the OCXO couple times
per year. My mw counter internal TCXO is always in agreement with
the Rb so I do not bother for routine frequency checks. The rb is
only +/- 5 E-11 so not as good as GPS but good enough for my use.
73, Ed - KL7UW
-------------
From: David G4DMP <da...@g4dmp.fsnet.co.uk>
To: Mike Harris <mike.har...@horizon.co.fk>
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3EXREF Query
Message-ID: <ulj9aoep0tpuf...@g4dmp.fsnet.co.uk>
Content-Type: text/plain;charset=us-ascii
About 10W for the MV89A double oven CXO, when run from a linear 12V
power supply. NOT trivial at today's prices for electricity in Great
Britain.
73 de David G4DMP
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
dubus...@gmail.com
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