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[Amps] Relays for RF switching

To: Amps reflector <amps@contesting.com>
Subject: [Amps] Relays for RF switching
From: Vic Rosenthal <vic@rakefet.com>
Date: Wed, 14 Apr 2004 22:11:29 -0700
List-post: <mailto:amps@contesting.com>
I needed a remote (indoor) antenna switching unit, and since I had everything I needed in my junkbox, I decided to build it instead of paying $140+ to Ameritron. I used some relays that I had purchased from All Electronics for $1.50 each; they are "power relays" with contacts rated 15a at 120 VAC. After all, 1500 watts into a 50 ohm line is only about 280 volts and 5.3 amps.

Hey, if it worked I'd be in the miser's hall of fame. However, what happened is that the relays got quite hot after about 15 seconds at the 1500 watt level. They are enclosed in little plastic boxes, but it's possible to touch the bottom of the armature and it is hot enough that I am afraid of what would happen in a contest or long rag chew.

I'm wondering if anyone has ever done anything like this, and if so, what kind of relays they used. Or, if someone has an Ameritron unit handy, if you would be so kind as to look inside and see what kind of relay they use.

I'm also curious as to why the relays heat up.

--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco



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