I have a Bird 43 Wattmeter I refurbished ( repainted, added a new plastic
carrying handle) with following slugs. Can take pics if wanted. Asking
$200obo shipped to your QTH. Paypal only.
250W 50-125MHZ
500W 2-30MHZ
100W 100-250MHZ
25W 50-125MC
50W 200-500MC
John Cooper WT5Y
409-499-6690
Hello All,
Does anyone have any suggestions for calibrating a
Bird 43 and the respective slugs? I picked up a used
one and would like to check it out.
Thanks,
Julius
n2wn
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You must be a
There are no user adjustments on the slug or pickup of the Bird that I am
aware of.
You could check it against some other known standard and construct a graph
paper of differences, but the Bird is good plus or minus 5 per cent about as
good as it gets for RF unless you go to high dollar
Hello All,
Does anyone have any suggestions for calibrating a
Bird 43 and the respective slugs? I picked up a used
one and would like to check it out.
Thanks,
Julius
n2wn
Lab cal is done by puting power through it measured with a
known standard. Adjustment is done with pot acessable
Put a good dummy load on your transmitter, set the frequency within the range
of the plug, turn on CW, and use a calibrated scope to measure the peak to
peak voltage.
Power = (Vp-p)^2/400 for 50 ohms.
Paul w0rw
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- Original Message -
From: J F [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Wednesday, September 29, 2004 7:10 PM
Subject: [Elecraft] Bird 43 Wattmeter calibration
Hello All,
Does anyone have any suggestions for calibrating a
Bird 43 and the respective slugs? I picked up a used
Where the Birds got a great reputation as the Standard was that every time
an FCC engineer would show up on site with the FCC test equipment to check
the output power of a transmitter, he would be carrying a Bird.
And he was a lot 'easier going' if there was a discrepancy and the
maintenance
Actually, the Bird type 43 wattmeter elements (slugs) do have a
calibration adjustment, but it is done at the factory. The trimmer is
located underneath the frequency range power label, which is glued
to the top of the element. This adjustment is done once at the factory,
and unless one of
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