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Re: [Amps] transformers

To: amps@contesting.com
Subject: Re: [Amps] transformers
From: "Will Matney" <craxd1@verizon.net>
Reply-to: craxd1@verizon.net
Date: Mon, 17 Jul 2006 13:34:35 -0400
List-post: <mailto:amps@contesting.com>
Rich,

That's right.Another and myself built a two tube driver that would produce 150 
watts to drive a pair of 3-500Z's 
for full throttle.You could vary the drive power anywhere from 75 watts to 150 
watts where 140-150 opened one up. 
That is as you mentioned if they had 3 kVDC on the anodes.

Best,

Will

*********** REPLY SEPARATOR  ***********

On 7/17/06 at 4:17 AM R L Measures wrote:

>On Jul 17, 2006, at 3:00 AM, Tom W8JI wrote:
>
>>
>>> Well, I stated what I have used for measurement, and I
>>> realize that the Bird
>>> and Nye Viking are not a Hewlett Packard.  I can accept
>>> that both meters may
>>> be off by 10%, even though their accuracy is supposed to
>>> be about half of
>>> that.
>>
>> One thing I have learned doing RF measurements almost every
>> day for 30 years or more is RF measurements are tougher to
>> do than most imagine.
>>
>> The accuracy of a Bird 43 meter, when properly calibrated
>> and used, is + or - 5% of full scale anywhere on the scale.
>> Since they do not manufacture a 1500 watt slug, the best we
>> can rely on is + or - 125 watts at any power level with a
>> properly calibrated 2500 watt slug. Many people would be
>> surprised at how far off a new Bird 43 and slug combo can
>> be.
>
>Good points, Tom.  However, as I recall, the spec is 5% of F.S. plus  
>5% of reading, so the accuracy would be +/- 125w plus +/- 75w = +/-  
>200w for a 1500w measurement.
>>
>> I know of several manufacturers that had great difficulty
>> making 1500 watts (measured by accurate means) with pairs of
>> 3-500Z's when only 100 watts of exciter power was available.
>> HV had to be over 3500 volts.
>
>IME, in linear operation, with 3000vdc  it takes c. 140w to drive a  
>pair of 3-500Zs to full throttle.
>>
>> 73, Tom
>>
>>
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>>
>
>R L MEASURES, AG6K. 805-386-3734
>r@somis.org
>
>
>
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