Message-ID: <32133D4DCF774C11B521A7B47C385985@ASUS>
From: <i.frith@ntlworld.com>
To: <rsgb_lf_group@blacksheep.org>
References: <1091782271.20170724143346@gmail.com> <5975FA1E.8090400@posteo.de> <FD3AB02DE7344D99B81B7EE2E11B2BBB@ASUS> <699365699.20170724155823@gmail.com>
In-Reply-To: <699365699.20170724155823@gmail.com>
Date: Mon, 24 Jul 2017 16:41:36 +0100
MIME-Version: 1.0
Importance: Normal
Subject: LF: Re: Antenna change over relay question
Content-Type: text/plain;
	format=flowed;
	charset="iso-8859-1";
	reply-type=original
Content-Transfer-Encoding: 7bit
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
Status: RO

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: rsgb_lf_group@blacksheep.org
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:dead.fets@gmail.com