P.S. IF you are really desperate, either remove
the silver cover, or drill a hole , about dead
center, in the (Power. Letter, as in ,where,say
1000 C, in the rectangular box),Just the aluminium
plate, NOT any deeper!).This about 6 o'clock
position. There is a calibration pot accessable
thru an access hole in the slug, and can be
adjusted- BUT I highly recommend against it! Jim
NN7K

Jim - NN7K wrote:
Heck best thing can do, is find someone else with a wattmeter, and then
compare the measurement, vs.
your slug/wattmeter. If within +- 5 % don't worry! You wouldn't even
hear the diff at 10 %!, but if memory serves, these are susposed to be
accurate to 5%.. Jim NN7K


L. wrote:
wrote in message
oups.com...
I have a 2,500 watt, HF slug that I don't have confidence in. Anyone
know who calibrates slugs for a reasonable fee?

Thanks.
Jeff
W8KZW

Have you contacted Bird? Last I heard, they were still making
equipment. As to "reasonable" - thats a good question. But then at
least you would know it is "accurate".

L.

Thanks guys and girls! Some good ideas. I hope the OP is following too.

L.

"Jim - NN7K" wrote in message
...
P.S. IF you are really desperate, either remove
the silver cover, or drill a hole , about dead
center, in the (Power. Letter, as in ,where,say
1000 C, in the rectangular box),Just the aluminium
plate, NOT any deeper!).This about 6 o'clock position. There is a
calibration pot accessable
thru an access hole in the slug, and can be
adjusted- BUT I highly recommend against it! Jim
NN7K

Jim - NN7K wrote:
Heck best thing can do, is find someone else with a wattmeter, and then
compare the measurement, vs.
your slug/wattmeter. If within +- 5 % don't worry! You wouldn't even
hear the diff at 10 %!, but if memory serves, these are susposed to be
accurate to 5%.. Jim NN7K


L. wrote:
wrote in message
oups.com...
I have a 2,500 watt, HF slug that I don't have confidence in. Anyone
know who calibrates slugs for a reasonable fee?

Thanks.
Jeff
W8KZW

Have you contacted Bird? Last I heard, they were still making equipment.
As to "reasonable" - thats a good question. But then at least you would
know it is "accurate".

L.

Yes, the slugs can be calibrated. Plate on slug is removed, then the slug
is calibrated. Important thing is to have an accurate standard to calibrate
to. Known 50 ohms with an accurate reading of voltage in the center of the
frequency range is a good start.

Colin K7FM

Bird is still in business in Solon, Ohio.

And Coaxial Dynamics, just up the road from Bird, who also makes slugs that
will fit the old 43, will calibrate Bird slugs.


wrote in message
oups.com...
I have a 2,500 watt, HF slug that I don't have confidence in. Anyone
know who calibrates slugs for a reasonable fee?

Thanks.
Jeff
W8KZW

"EchoBlip" wrote in message
.. .
Bird is still in business in Solon, Ohio.

And Coaxial Dynamics, just up the road from Bird, who also makes slugs
that will fit the old 43, will calibrate Bird slugs.


wrote in message
oups.com...
I have a 2,500 watt, HF slug that I don't have confidence in. Anyone
know who calibrates slugs for a reasonable fee?

Thanks.
Jeff
W8KZW


While we didn't get a "price" from Bird to calibrate - another poster
suggested they weren't "reasonable". I wonder if you might have any
experience - price wise - with Coaxial Dynamics? Or perhaps able to do a
side by side price comparison - from past experiences?

L.

Using the technique practiced in the National HRO, you can simply make a
calibration chart for each particular slug. That makes it useful over a
much wider frequency than it is marked. The directivity remains even though
the slug is used "off frequency". It does not matter what the power reads
on the meter - if you know by a calibration chart what the actual power is.

Colin K7FM

On 13 Sep 2006 13:44:56 -0700, wrote:

I have a 2,500 watt, HF slug that I don't have confidence in. Anyone
know who calibrates slugs for a reasonable fee?

Thanks.
Jeff
W8KZW

http://www.radiodan.com/ deals in new and used Bird equipment. He
might have some advice, or might do a tradeout with you for another
slug.

bob
k5qwg

Well, I went to the horse's mouth and asked Bird 1) how much, and 2)
might I drop in ...

Hello Jeff,
The cost for calibration on 2500w slug is base on Frequency Bands
The cost 2500H is $100 the cost for 2500A; B; C; D; E AND J is
$200
Regarding walk in, no we do not Calibrate walk-in basis.

Best regards,

Not unreasonable, I think, for commercial concerns, given the time it
likely takes to do this and the investment they have made in
professional-grade equipment. A bit steep for me for casual, amateur
use though.

.... at least they were nice.

73,
Jeff

wrote:
Well, I went to the horse's mouth and asked Bird 1) how much, and 2)
might I drop in ...

Hello Jeff,
The cost for calibration on 2500w slug is base on Frequency Bands
The cost 2500H is $100 the cost for 2500A; B; C; D; E AND J is
$200
Regarding walk in, no we do not Calibrate walk-in basis.
=============================================
Re Bird calibration: When my company had all test equipment out for
calibration for ISO-9001 certification, I included an out-of-tolerance
Bird slug with one of our 43 wattmeters. The meter 'passed', & still
had the 'bad' slug in it. I queried the tech, & he said they only check
the 30MA meter - not the slugs.

A ham who ran/runs a used test eq. biz in the MD-DC-VA area used to
make the local hamfests. He would take bad & out-of-calibration slugs
in trade, & repair them in his shop. He found a source for the [then]
scarce diodes, + did a neat job of removing the drive pins that secure
the face plates. If I could remove them neatly, I'd calibrate one of
mine. At one hamfest, a CBer walked up & asked him if he had his 25KW
slug yet. I started to follow him back to his car, & report his tag #
to the FCC.

BTW, I have some extra VHF/UHF slugs, & need a few HF slugs.

73,
jack_son73