[Drake] TR-3 S-Meter Short

Thu, 28 Feb 2002 20:30:42 -0600

Checked both meters, they move.  Checked my meter, it's goofy. :^)

Aside from that, I'm supposed to be looking for a shorted Amp meter, not S
meter.  Ugh,  I need more sleep.  I really do :^)

72/73/oo
Rob, kc0bom
ARRL; FP Qrp -330; Live-Wire #442; IA QRP #143; SOC #497; QRPp-I #19

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----- Original Message -----
From: Glen Zook <[email protected]>
To: Rob Matherly <[email protected]>; Drake Radio Operators
<[email protected]>; <[email protected]>
Sent: Thursday, February 28, 2002 6:32 PM
Subject: Re: [Drake] TR-3 S-Meter Short

By "short" do you mean less than 1 ohm resistance?  I
haven't looked at the internal resistance of the "S"
meter in that particular receiver, but many meters
have a fairly low resistance (i.e. well under 50
ohms).

Take a single flashlight battery (1.5 volt, doesn't
matter what size) and two pieces of wire.  Attach one
wire to each terminal of the meter.  Then touch the
wire from the + terminal to the + (positive) end of
the battery and the wire from the - terminal to the -
(negative) terminal of the battery.  If the meter
deflects (it may go to the pin, it may only move a
little bit) then the meter is probably OK.  If it
doesn't move at all, then there is definitely a
problem with the meter.

There are all sorts of things that can cause a "short"
in the meter.  Also, it is possible that the "needle"
has come out of the pivots.  If that is so, you can
"repair" it fairly easily.

Glen, K9STH

--- Rob Matherly <[email protected]> wrote:

I was told the source of the problem with my Drake may
be a shorted S-Meter.  I checked the meter, and there
is indeed a short across it.

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