As well as the individual calibration on the slugs there is another
calibration pot inside the Bird 43 feeding the meter movement if my memory is
correct.
You need to compare the meter and slugs against a known standard or a
recently calibrated power meter into an accurate dummy load. Ins
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
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 te
M4ESD
- Original Message -
From: "J F" <[EMAIL PROTECTED]>
To:
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
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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> 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 aces
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 calorimetr
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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