[Johnson] T/R relay

[Carl]

Putting a small 10-12V transformer inside wired to buck the primary reduces 
a lot of heat also. I use a large bucker to power each bench and it does 
wonders for reliability and heat reuction. I usually recommend against 
replacing rectifiers with SS except for MN rectifiers.

Carl
KM1H


----- Original Message ----- 
From: <manualman at juno.com>
To: <johnson at mailman.qth.net>
Sent: Thursday, July 11, 2013 1:08 AM
Subject: Re: [Johnson] T/R relay


>I solid-stated the rectifier in the thing about 30 years ago and that got
> rid of a lot of heat.
>
> Pete, wa2cwa
> http://www.manualman.com
>
> On Wed, 10 Jul 2013 23:15:26 -0500 (GMT-05:00) Pete Ferrand
> <petef at sprynet.com> writes:
>> 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
>
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