Of course there is some "heat" from the relay coil.
It depends on "what" is getting warm.
The MFJ switches are clearly not rated for 1500W Rtty.
The published specs speak for themselves(2kw pep/1kw cw).
Ameritron switches are rated higher, spec wise, and are still reasonably
priced.
It also depends on what the antenna SWR is.
-----Original Message-----
From: rtty-bounces@contesting.com [mailto:rtty-bounces@contesting.com] On
Behalf Of Ian White GM3SEK
Sent: Sunday, March 16, 2008 9:13 AM
To: rtty@contesting.com
Subject: Re: [RTTY] MFJ Antenna Switches
John Elsik wrote:
>-----Original Message-----
>>From: rtty-bounces@contesting.com [mailto:rtty-bounces@contesting.com]
>>On
>>Behalf Of W7RY
>>Sent: Sunday, March 16, 2008 8:11 AM
>>To: GARY ELLIOT; rtty@contesting.com
>>Subject: Re: [RTTY] MFJ Antenna Switches
>>
>>We used several of them at WA7EGA. They would get a little warm but
>>they never failed.
>
>Heat = loss
>Heat = underrated for the power/class of service
>
All coax switches get warm, for no more reason than "heat = current
through relay coils".
--
73 from Ian GM3SEK
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