[Johnson] Johnson External SWR Meter

Sun, 1 Jun 2003 06:46:25 -0500

The last two EFJ directional couplers I've opened up had fried resistors
inside, that had been overheated to the point of being either open or
grossly out of tolerance. I'd look in there and check them first. Seems I
recall they were two watt carbon 1%'s. Might be a bit hard to find the real
thing, but at any rate be sure to use non-inductive replacements.
73, Jerry W5KP

----- Original Message -----
From: "Harry Vaught" <[email protected]>
To: <[email protected]>
Sent: Saturday, May 31, 2003 9:58 PM
Subject: [Johnson] Johnson External SWR Meter

> I have a Johnson Directional Coupler and Indicator which will indicate
only
> about 40% of full scale in "calibrate" mode.  In SWR mode, it indicates an
> SWR proportionate to the full power indication.  The original meter was
worn
> out and I have a new 100 ua meter from AES.  Esthetically, it won't do in
> the long run, but it allows me to try the thing out.
>
> Does anyone have experience with these units?   I've replaced the caps.
How
> about the diodes?  They are 1N294's, which Radio Shack doesn't seem to
have.
>
> As I said, it seems to be working, it just won't give me a full scale
> calibration with my Ranger at about 50 watts out.
>
> Thanks,
>
> Harry Vaught, KT4AE
> Lawrenceville, Georgia
>
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