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LF: Re: Antenna change over relay question

To: <[email protected]>
Subject: LF: Re: Antenna change over relay question
From: <[email protected]>
Date: Mon, 24 Jul 2017 16:41:36 +0100
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Hi Chris

Well I guess my remarks do have a bearing on your question.

Sorry to put the mockers on the idea, but you could test the switch before connecting the RX to it, that may at least ensure the switch can stand the stress.
When the RX is connected!!!! I guess tts the risk.

Can send you my switch details if you wish.

73

Ian G4GIR






-----Original Message----- From: Chris Wilson
Sent: Monday, July 24, 2017 3:58 PM
To: [email protected]
Subject: Re: LF: Re: Antenna change over relay question

Hello Ian,

You  have me worried now, as does Andy with his last post, the thought
of  putting  a kilowatt into the RX antenna socket of my 590 is not a
pleasant or cheap one... Hmmm.



Monday, July 24, 2017, 3:40:38 PM, you wrote:

Hi Chris/Stefan
Loosely connected to your question, I wanted to switch my Inv L between
LF/MF Variometer/loading coils and HF Auto remote tuner remotely, i.e 120'
away from the shack.
Every relay I tried had insulation break down and contact arc over. Only
running 360 W at MF and 300 at LF.
My solution was to fabricate a 3 position Knife type switch operated via a
Servo motor to switch the antennae and a standard 20 Amp Rated relay for the
RF inputs to the Tuner and Variometers.
No more insulation break down or arc over. The contacts are mounted on Old
Eddystone porcelain insulators.
I would be interested to know how the relay holds up with 1 kW at 136 kHz.
73
Ian G4GIR





--
Best regards,
Chris                            mailto:[email protected]


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