[Collins] kwm-2a problems

Sun, 1 Sep 2002 18:30:30 -0400

Follow-up:

Jim's response is the correct one.  However, I would add that this No. 18
wire should be replaced by something more substantial like a braided wire or
No. 14 wrapped around the shield and then soldered to the ground terminal.

I often wonder how many military units were scrapped all because of this
improper ground connection.  You would have thought that the engineers who
designed the 516F-2 power supply would have used heavier wire!

David Knepper - W3ST
Secretary to the Collins Radio Association (CRA)
Publisher of the Collins Journal
www.collinsra.com
CRA station call - W3CRA
----- Original Message -----
From: "James Monk" <[email protected]>
To: <[email protected]>; <[email protected]>
Sent: Sunday, September 01, 2002 6:17 PM
Subject: Re: [Collins] kwm-2a problems

> Dale..... if you are using a 516F-2 power supply, part of the filament
> string circuit uses the shield of the power cable for that part of the
> filament circuit.
>
> A common problem is the jumper connecting the shield to chassis/ground at
> the power supply end of the shield becomes broken, due to repeated
> rotation/twisting of the cable.
>
> The ground connection is somewhat buried under the wiring and difficult to
> see, unless you poke around a bit.
>
> You might pull the power supply chassis out of the cabinet, turn it over
and
> check it out.
>
> The fix is to repair the break and clamp the cable so it is not able to
> rotate and break the conductor in the future.
>
> Good luck/;jim/W0JJL
>
> Sponsored by the Collins Radio Association
> http://www.collinsra.com
>