[AMRadio] Questions on Johnson Ranger II

[kc9cdt at aol.com]

Geoff, and others...
OK, upon some checking I find the R35 Modulator screen voltage adj 
resistor to be open between where the wiper is attached and to  ground. 
(close to the ground side).
There is about 9k between the wiper and the big 10uf cap.
Would this cause the modulator current to read 100ma??
Thanks,
Lee



-----Original Message-----
From: Geoff <w5omr at att.net>
To: Discussion of AM Radio in the Amateur Service 
<amradio at mailman.qth.net>
Sent: Mon, Apr 30, 2012 11:52 pm
Subject: Re: [AMRadio] Questions on Johnson Ranger II


On 4/29/2012 10:48 AM, kc9cdt at aol.com wrote:
> Geoff,
> Thanks for all the help.
> Well,
> I guess I can meter the primary of the Mod XFMR...if it's open that
> should be obvious.

Well, either open or shorted.  Come to think of it, a shorted
transformer would cause a much higher current reading.  Make sense?

> OK, I have a handle on a old Viking II...is the mod XFMR the same...if
> it is, I can get it cheap.

The Interstage audio Driver transformer, I believe, is the same in the
Ranger and the Viking II.
Neither of 'em are much bigger'n a walnut (so it seems)

> Maybe I should adj the resistor just to see if it helps?
> If the resister is open...would that cause the high current?
>

The sliding tap resistor is what sets the screen voltage.
Be very careful when sliding that tap... best to remove all stress from
the 'slider' and don't slide it at all, rather open it up, place it
where you want it, then re-secure it and measure.

-Geoff/W5OMR

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