[ARC5] [Milsurplus] TCS RF ammeter or thermocouple replacement

[J. Forster]

If it's been worked on, check the wiring and connections. The meter dial
usually says something like 1 mV FS, and that info can be used to test it.

-John

==============



> Yes, I've used TCS  for years by just loading via the plate current but I
> would like
> to get the RF Ammeter going again instead of it just staring at me, one
> eyed,
> begging me to do something! Just dismounted it, judging from burred slots
> on
> the tiny emplacement
> screws, this meter's been worked on before. The terminal bolt nuts, flush
> against the bakelite/presumanbly
> thermocouple base/are VERY firmly tightened. I've repaired several meter
> movements
> before, but have never "resurrected" a thermocouple.
>
> Had and still have another burnt our RF Ammeter but I didn't see how I was
> going to get at the thermocouple
> bulb without shattering the glass  -- maybe they can function w/o being in
> a
> vacuum - that is if
> the thermcouple can be repaired as someone else one list says they can..
>
>
>
>
> JFOR -- my thought, too that since it shows some reading, it's
> not totally hopless -- I could also just multiply the readings by about
> four!.
>
>
> Well what do you know , TCS_Radios at yahoogroups.com ! Thanks for that!
>
>
> Henry, Cph.
>
> ----- Original Message -----
> From: "mac" <w7qho at aol.com>
> To: "Henry Frederick Meils Meiseles" <meils at get2net.dk>;
> <TCS_Radios at yahoogroups.com>
> Cc: <arc5 at mailman.qth.net>; <milsurplus at mailman.qth.net>
> Sent: Wednesday, May 25, 2011 7:02 PM
> Subject: Re: [Milsurplus] TCS RF ammeter or thermocouple replacement
>
>
>> Don't let a bad RF ammeter keep you from using the radio, though.   Just
>> tune and load it up using the PA plate current meter like you  would
>> with
>> a Viking 2  or any of the many other ham HF rigs that never  included RF
>> ammeters.
>>
>> Dennis D.  W7QHO
>> Glendale, CA
>>
>> *****************
>> On May 25, 2011, at 8:54 AM, Henry Frederick Meils Meiseles wrote:
>>
>>> I need a repalacement for my TCS RF ammeter -- or perhaps just the
>>> thermocouple, if that is replacable.
>>> Of course I could always make a makeshift RF output readout using a
>>> diode (WS-19 style) and self- calibrate a panel meter (putting in a
>>> new
>>> face on the original or an other meter)  but prefer to keep the
>>> original
>>> meter.
>>>
>>> I haven't opened the meter yet to take a closer look at the how the
>>> thermocouple is mounted -
>>> I assume that once a thermocouple is overloaded, it's not reparable.  I
>>> do have other thermocouples
>>> of another type, which I could use and calibrate a new dial face --
>>> again losing
>>> the original installation.
>>>
>>> My TCS-12 RF Ammeter hardly budges, even under heavy RF currents.  The
>>> problem  appeared many years ago, probably, if I remember  correctly, a
>>> result of drawing too much current while matching an  antenna using an
>>> external variable capacitor across the RF output. I  haven't used the
>>> rig
>>> in many years but now wish to reactivate it --  also remember that the
>>> RF
>>> Ammeter on my GF-11 had to be treated with  caution.
>>>
>>> If anyone has an extra TCS RF ammeter/thermocouple unit, please let  me
>>> know.
>>>
>>> Thanks in advance,
>>> Henry oz3o, n2nr
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>>
>
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