I agree with Chuck,
Laird, formerly Steward, is an established magnetics company.
Jack Smith of Clifton labs uses them in some of this designs.
http://www.cliftonlaboratories.com/easy_broadband_transformer.htm
You should evaluate them.
73,
Mike N2MS
- Original Message -
From:
Any one out there using a Bird 43 for measuring out put power for QRP?
I have a 250H element for HF. Should I get the 50H element for HF?
I have a Ten-Tec Omni VI Plus Power turned down to minimum. with the 250H slug
I measure 5 watts, first mark from the bottom of scale. Not very accurate or
There are lower wattage slugs but for a much higher frequency range.
The 250H range is 2 to 30 mhz 160M is not quite covered but I think
is ok.
Bird make HF (H) elements at 5, 10, 25, 50, 100, 250, 500, 1000, 2500,
5000 and 1 Watts. Finding the 5, 10, or 25 Watt elements new may
be a
Adding to Joe's suggestion, NM3E and Chuck Martin RF Supply are good sources
for used Bird and Coaxial Dynamics product. I've been pleased with both
suppliers.
http://www.nm3e.com/
http://www.chuckmartin.com/
Paul, W9AC
- Original Message -
From: Joe Subich, W4TV li...@subich.com
Hi Jim
Many years ago at 4U1ITU I found the Bird 43 grossly underestimated
the power output on 160, rather embarrassing at the temple of
regulation.
Bob VE7BS
The 250H range is 2 to 30 mhz 160M is not quite covered but I think
is ok.
___
UR RST IS
Bob,
If you had a 250H that read grossly underestimated, then you had a bad element,
the line section or the meter. The usable range in NOT a square-wave.
Price W0RI
Hi Jim
Many years ago at 4U1ITU I found the Bird 43 grossly underestimated
the power output on 160, rather embarrassing at
Try Webster Communications in Rochester, Michigan. This is the old Webster
Band Spanner mobile antennas. He's still around, I saw him at Dayton this
year. He sells Bird elements.
Also, don't forget Coaxial Dynamics that sells a wattmeter that uses elements
that are compatible with Bird
Simply going to the Bird site would have given you a glimpse at one of their
manuals that has the correction factors needed.
Carl
KM1H
- Original Message -
From: Bob Eldridge eldri...@direct.ca
To: topband@contesting.com
Sent: Saturday, June 30, 2012 1:44 PM
Subject: Re: Topband: QRP
Evaluate against what? While Ive heard of Steward in the past I see nothing
on Lairds site that gives me any information to base an evaluation on.
Would you buy a complete unknown product of any kind without knowing all the
specs? And not having to waste time filling out a form and not even
Many years ago at 4U1ITU I found the Bird 43 grossly underestimated
the power output on 160, rather embarrassing at the temple of
regulation.
If that was the case, they had a bad slug. The rating of the Bird 43 and
standard slug is + or - 5% of full scale anywhere on the scale within the
On 6/30/2012 3:34 PM, ZR wrote:
Evaluate against what? While Ive heard of Steward in the past I see nothing
on Lairds site that gives me any information to base an evaluation on.
I've had samples and a catalog from Stewart for years, but there's not
nearly enough data there on which to base a
Or if you don't want to concern yourself with different slugs for different
frequencies and power levels (other than UHF)...sell your Bird wattmeter and
all the slugs and get a LP-100A which has NIST traceable calibration and
typically reads +/- 3% of the power reading from 1 W to 3000W and
Evaluate against what?
Hmm seems kind of a silly statement to me as a designer.
Evaluation is the job of component engineering in most companies. They make
sure that the components conform to the specification data sheets provided or
not by the suppliers. Just so you always purchase the
I have found an off brand ferrite to perform well beyond my expectations
Control the quality of any product is expensive but it can assure that every
single core has the same specification range. Narrow the range higher the
price.
When the specification is not clear and the product has half the
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