[Milsurplus] minor correction/Fw: RF ammeters / BC442-A

[J. Forster]

The "ceramic cup...." is a current transformer.

-John

==========





> For what it's worth I bought some BC-442A thermocouples from Fair Radio
> about 5 or 10 years ago and they were spec'd (if I recall correctly) at
> 0.750 RF Amp full scale.
>
> In the BC-442A there is a ceramic cup with a powdered iron (no ferrites in
> those days) core. The cup is about 1 inch in diameter. Outside the cup are
> two one-turn loops isolated from one another and spaced about  1/2 inch
> apart. One loop is in the antenna line. The other loop feeds the
> thermocouple.
>
> The reason for this rig - and it's a very sound one - is that
> thermocouples
> blow out not only from over current but also because of an RF arc from one
> side to ground.
>
>
>
> Miles B. Anderson, K2CBY
> 16 Round Pond Lane
> Sag Harbor, NY 11963
> Tel.: (631) 725-4400
> Fax.: (631) 725-2223
> e-mail: k2cby at optonline.net
>
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