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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