[Milsurplus] minor correction/Fw: [ARC5] RF ammeters / BC442-A ...

[Henry Frederick "Meils" Meiseles]

meant to write, "Were THESE (BC442-A) ammeter units ...for  higher power 
rigs?

----- Original Message ----- 
From: "Henry Frederick "Meils" Meiseles" <meils at get2net.dk>
To: <milsurplus at mailman.qth.net>; <arc5 at mailman.qth.net>
Sent: Friday, May 27, 2011 7:45 AM
Subject: [ARC5] RF ammeters / BC442-A ...


>I have two type "ANTENNA RELAY UNIT BC-442A," of which one is functional.
>
> Is the 1 - 10 scale arbitrary or is it  actual/real amperes of current?
>
> 10 A seems like a lot for rigs in the 25-40 watt output class but 
> considering
> how often RF ampere meters burn out because of short period mismatches,
> this might well be an intentional protectional "overshoot." Were ammeter
> units also used for higher power rigs? The ART-13 has an RF ammeter of 3A,
> if I remember correctly, even though it could deliver considerably more
> than a Command transmitter.
>
> A quick comparison did show "1" when 1 A was read on a second
> series connected RF ammeter.  -- I could rig it to my RF wattmeter but
> at present cannot generate more than 100W RF out to the 50 ohm dummy
> load --- which would only yield 1.41 A, anyway.
>
> I don't know if my -442A is reading out as it should but I do get about 
> 1.5 A
> at 100W out into 50 ohms, which is close to the theoretical value.
>
> Since RF ammeter burnt out is a common problem, (I assume some on the list
> will object to this claim). What about fusing them ?
>
> (Yes, I can always run my TCS transmitter output through my 442-A,
> and maybe will do so.)
>
> I have some ideas using a different principle for RF current out readings.
>
>
> Henry, Cph.
>
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