[ARC5] RF ammeter

[Ian Wilson]

The BC-AS-230 on which I recently replaced the meter had this
insulating plate present. It was original (the paint holding the
various nuts in place was all unbroken).

73, ian K3IMW


On Fri, Aug 8, 2014 at 1:18 PM, AKLDGUY . <neilb0627 at gmail.com> wrote:

> The front panel views of the BC-AR-230 shown here
>
> http://www.rkk-museum.ru/vitr_all/exhibits/1013_e.shtml
>
> seem to show insulating material around the meter. Original or mod?
>
> 73 de Neil ZL1ANM
>
>
>
> On Sat, Aug 9, 2014 at 3:07 AM, Mike Everette via ARC5 <
> arc5 at mailman.qth.net
> > wrote:
>
> > The ARC-5 meter has an external thermocouple.  The ART-13 meter has an
> > external pickup loop (current transformer), which keeps the high RF
> voltage
> > out of the meter itself.  And, the ARC-5 meter has a current transformer
> to
> > feed the thermocouple.
> >
> > It's been a while since I looked at the TCS schematic to see how those
> > meters are configured; but if I remember right the RF goes directly
> through
> > them.  Are they mounted directly to a metal panel, or to some kind of
> > insulating material?  I used two in a home brew balanced line antenna
> tuner
> > back in the 1970s, and mounted them on a piece of plexiglas behind an
> > aluminum panel with over-size holes for the meter case flanges.
> >
> > 73
> >
> > Mike
> > WA4DLF
> >
> > --------------------------------------------
> > On Thu, 8/7/14, D. Platt <jeepp at comcast.net> wrote:
> >
> >  Subject: Re: [ARC5] RF ammeter
> >  To: arc5 at mailman.qth.net
> >  Date: Thursday, August 7, 2014, 5:01 PM
> >
> >  Gents,
> >
> >  Are not the RF ammeters on TCS
> >  stuff panel mounted?  How 'bout the
> >  ART-13 or the '275N?  Or... am I not
> >  seeing things correctly?  Of course
> >  we're not talking high power with these
> >  units, either.
> >
> >  Jeep -
> >  K3HVG
> >
> >  On 8/7/2014 4:22 PM,
> >  Kenneth G. Gordon wrote:
> >  > On 7 Aug 2014
> >  at 12:50, Mike Everette wrote:
> >  >
> >  >> I'd be wary of mounting one of
> >  these meters in a steel panel or box because its
> >  >> calibration would be adversely
> >  affected.
> >  > As a matter of fact, ANY RF
> >  ammeter is supposed to never be mounted on a
> >  > steel panel, and I would avoid aluminum
> >  for the reasons you state: possibly
> >  >
> >  arcing.
> >  >
> >  > Ken
> >  W7EKB
> >  >
> >
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