Hewlett Packard also made directional couplers. If the loss factor in
the forward pickoff arm of the coupler was known, power measurements
could extend considerably upward.
On Mar 25, 2005, at 8:07 AM, Bob Nielsen wrote:
> On Fri, Mar 25, 2005 at 10:48:53AM +0000, David Kirkby wrote:
>
>>
>> 1) In response to Gary Smith I said " I suspect Bird use Calorimeters
>> for internal use, but would not use them to calibrate each and every
>> element they sell, as the method is too time consuming."
>>
>> 2) "Another big problem for amateur power measurement would be line
>> voltage variations. Since any such measurement by Calorimetric
>> methods
>> will take 10's of minutes at least, there needs to be a way of keeping
>> the RF and DC power constant."
>
> The Hewlett-Packard Calorimeter I used at Hughes Aircraft in the early
> 1960s was much faster than that. It didn't take much longer to make a
> measurement than using a bolometer-type meter--not instantaneous, but
> perhaps several seconds. I recall it would measure up to 10 watts,
> which was sufficient for the measurements I was making, but higher
> power
> levels would still require the use of attenuators.
>
> 73, Bob N7XY
>
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>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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