|[AMRadio] Thermocouple rf ammeter|
JRusgrove at comcast.net
Sat Feb 10 10:53:59 EST 2007
There are both internal and external types. I have an internal type NOS Simpson 0-5A (packaged 1/58)
that is very accurate. No telling about the accuracy of abused meters...other than to verify their
They can be easily checked if you have a DVM that reads ac amperes. Put the DVM and the rf ammeter
in series with an appropriate sized load (several light bulbs) and plug it in to 120 VAC.
----- Original Message -----
From: "Rbethman" <rbethman at comcast.net>
To: "Discussion of AM Radio in the Amateur Service" <amradio at mailman.qth.net>
Sent: Saturday, February 10, 2007 10:32 AM
Subject: Re: [AMRadio] Thermocouple rf ammeter
> There is 'supposed' to be an EXTERNAL thermocouple that sits in parallel
> to the RF Ammeter.
> The ammeter is ONLY one piece.
> My $0.02 worth.
> Bob - N0DGN
> A.R.S. - W5AMI wrote:
> > Don, or anyone;
> > I've got a NOS, still in the box Triplet 0-5 amp rf ammeter that I'd
> > like to hook up. Using balanced feedline, I'm assuming I just hook it
> > in series with one leg of the feedline. This would be AFTER the
> > balanced link coupled tuner of course. Do; do you use two, one on
> > each leg?
> > I've been thinking about getting another one just like it for both
> > legs, but I'm not so sure that's really necessary if your feedline,
> > tuner, and antenna are truly balanced. One leg should read the same
> > as the other ...in theory ;)
> > Thanks,
> > Brian / w5ami
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