[Johnson] T/R relay

[Pete Ferrand]

Hi Bob et al:

I've used one of these for over 20 years and have forgotten to turn it off as well, although it goes off when station power is off.

The switches get extremely hot and this can't be good in spite of what Johnson says. I have always mounted mine approximately with the end that holds the UHF connectors facing the ceiling at a slight angle, pulling the heat away from the transformer and capacitor but allowing it to flow out of the air holes. There's air underneath as well. I'm hoping it helped.

-Pete
WB2QLL
Somers, WI




-----Original Message-----
>From: Robert Nickels <ranickel at comcast.net>
>Sent: Jul 10, 2013 10:36 PM
>To: johnson at mailman.qth.net
>Subject: Re: [Johnson] T/R relay
>
>On 7/10/2013 10:00 PM, Charles Ring wrote:
>> I've had 3 of them and the power transformer on two of those have failed
>I don't remember hearing of case history issues with the transformer but 
>I do know there's no power switch, and I've inadvertently left 'em 
>turned on for what might be called an "extended period of time".    This 
>may have contributed to transformer failure.   I've since added power 
>switches and indicators, or run them from a switched outlet.
>
>73, Bob W9RAN
>______________________________________________________________
>Johnson mailing list
>Home: http://mailman.qth.net/mailman/listinfo/johnson
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:Johnson at mailman.qth.net
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html