[R-390] R390A Audio Meter FS

[ka9egw at britewerkz.com]

Take a look at the lower right corner of page 188 of TM-11-856A.  The line
level meter isn't connected to *anything* but a handful of range resistors
and their associated switch wafers, all on the secondary of T602--the line
out transformer.  And there are no "+" or "-" by M101, which is indicated by
a simple circle with "VU" inside it.

Moreover, one side of M101 is connected directly to one side of T602's
secondary.  There is no diode shown anywhere in that part of the circuit.

Where in TM11-856A are you looking?  The schematic on page 188 shows no way
[barring a short between windings of T602] for DC to get to M101.

If somewhere else in the manual M101 is shown with polarity markings, then
we do indeed have a puzzle.

73, Brian KA9EGW

-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net]On Behalf Of rbethman
Sent: Tuesday, September 21, 2010 1:15 PM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] R390A Audio Meter FS


  Please pull out the TM 11-856A.

As you go through the schematics, you'll note the BOTH meters have a +
and a - connection.

Keep digging and reading.....

These are the SAME interior devices with different faces.

Bob - N0DGN

On 9/21/2010 1:48 PM, ka9egw at britewerkz.com wrote:
> What he said.  I always thought the audio meter had a --->|---\/\/\/--- in
> it.
>
> -----Original Message-----
> From: r-390-bounces at mailman.qth.net
> [mailto:r-390-bounces at mailman.qth.net]On Behalf Of David Wise
> Sent: Tuesday, September 21, 2010 12:40 PM
> To: r-390 at mailman.qth.net
> Subject: Re: [R-390] R390A Audio Meter FS
>
>
> Who'd have thought!  That opens up some possiblities.
>
> So I take it you took apart an audio meter
> to get past the rectifier and maybe a resistor?
>
> Dave Wise
> SWL in Hillsboro Oregon

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