Tom & the bunch:
As for the actual ultimate accuracy against that caloric standard, I will
have to trust BIRD as I am not capable of that measurement myself.
It would be an interesting test to see just what does happen at different
power levels as a percentage of a particular slug value.
I usually use a line section with a 2500H forward and a 250H reverse with
two separate meters, but most Bird elements I have seen in use at friends
stations are in a 43 and the very same slug is usually just turned around
for SWR.
I wonder if a slug was 5% off at full scale, would it stay 5% off at all
power levels or would that 125 watt possiblility become a larger percentage
of error at any given lower than full scale reading? It seems that BIRD is
saying that a 5% of full scale error is possible anywhere on the scale.
Would this mean using a 2500H slug it is possible to try to read 200 watts
and get 75 to 325 watts as a reading?
Time to get the slugs back out of the drawer................
73, Dan Magro
Radiodan W7RF, Portable Clinic
High quality Henry Radio RF Power Amplifiers for LESS!
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-----Original Message-----
From: Tom Rauch <10eesfams2mi@mail20.MCIONE.com>
To: amps@contesting.com <amps@contesting.com>; Radiodan W7RF
<RFpower@radiodan.com>
To: <amps@contesting.com>
Date: Monday, June 15, 1998 9:03 AM
Subject: Re: [AMPS] Bird 2500H dozen slug test
To: <amps@contesting.com>
> Date: Sun, 14 Jun 1998 19:06:18 -0700
> From: Radiodan W7RF <RFpower@radiodan.com>
> Subject: [AMPS] Bird 2500H dozen slug test
> To: "[AMPS] submissions" <amps@contesting.com>
> Hi guys,
>
> I was curious about relative BIRD wattmeter slug accuracy
Bird publishes tolerances measured against a caloric standard.
How do your results compare to their + or - 5% of full scale anywhere
on the scale for slugs and a model 43?
I've found only a few out of tolerance, but by far most fit ratings
OK, when compared to a caloric standard.
It's amazing how poor meters can be, when you use the slug far down
on the scale.
73, Tom W8JI
w8ji.tom@MCIONE.com
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