[ARC5] RF ammeter

[AKLDGUY .]

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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