[ARC5] Re: [Milsurplus] RF Ammeter Puzzle

[WA5CAB at cs.com]

John,

Bruce was merely trying to say that (assuming that the thermocouple is still 
good) you could confirm the full scale sensitivity of the meter itself with DC 
just as well as with AC or RF.

But no (I realized I wasn't certain of the correct spelling of "au 
contraire"), a 250 ma full scale meter is not very delicate.  It's quite robust.  20 ua 
movements are delicate.  And the fine print on the scales on almost a dozen 
RFA's of three or four different makes removed from ATC and AN/ART-13 
transmitters that I have all clearly say "250 MA FS".

The answer to the original question is yes.

In a message dated 2/27/2008 11:09:01 PM Central Standard Time, jfor at quik.com 
writes: 
> (a) I don't have an ART-13 or even a meter, and (b) the DC won't go through 
> the
> current transformer...  you'd have to have a high current RF source.
> 
> Robert Downs opined a 20:1 ratio on the transformer ( it's wound on a 
> Steatite
> bobbin, not a magnetic core), but I'm no so sure. A 250 ma FS TC RF ammeter 
> would
> be very delicate.
> 
> The original question was if the referenced meter needed an external shunt 
> and /
> or current transformer and, to that end, I was trying to ID it's original
> purpose.
> 
> 

Robert Downs - Houston
<http://www.wa5cab.com> (Web Store)
MVPA 9480
<wa5cab at cs.com> (Primary email)
<wa5cab at comcast.net> (Backup email)
   
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