[R-390] T-203

[Bob Camp]

Hi,

This is a *very* common problem with R-390's. The military blew out a lot of
the 4 MHz coils. They had a problem with their setup that made this fairly
common.

Apparently in the AN/SRA-xx antenna coupler when you set the receiver to
"idle" it winds up tuned to 4 MHz. As soon as they fire up the transmitter
on that band the transmitter power routes to the receiver input. The result
is what you observe on the transformer.

I know that doesn't help at all but at least it's noting you did to the set.
On the ones I have had replacing the transformer is the only option.

    Take Care

        Bob Camp
        KB8TQ
----- Original Message -----
From: "Art Usher" <artu3@ecenet.com>
To: <r-390@mailman.qth.net>
Sent: Monday, December 16, 2002 9:00 PM
Subject: [R-390] T-203


> Folks: --
> Have a Stewart Warner R-390A that in the past someone juiced with rf in
the
> 75 meter position I believe.  When I have an antenna connected and change
> the bands all have background noise "except" the 2 to 4 mc one.. This
makes
> me suspect someone nailed the coupling cap in the unbalanced input of
> T-203.. I have the RF assy out but can't get the can to budge...even tho
> I've removed the phillips head screw I found down in the coil form...Can
> anyone help me out here ??
> tnx in advance
> 73
> Art
> W0EIZ
>
>
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