Message-ID: <4954152A10BC490FA11F0652D1AF67A7@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> <32133D4DCF774C11B521A7B47C385985@ASUS> <925441532.20170724172345@gmail.com>
In-Reply-To: <925441532.20170724172345@gmail.com>
Date: Mon, 24 Jul 2017 17:42:09 +0100
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Subject: LF: Re: Antenna change over relay question
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Status: RO

Ok Chris

Will send you some info shortly, domestic duties call!! University Challenge 
tonight too, i.e XYL/OM Challenge hi.

No that's not me, programming knowledge 2%!

73

Ian

G4GIR

-----Original Message----- 
From: Chris Wilson
Sent: Monday, July 24, 2017 5:23 PM
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Re: Antenna change over relay question

Hello Ian,

I  would  like  to  see  the  details  yes  please  Ian. I want to do
something  similar  to  enable  my strapped feeder for LF to revert to
none  strapped  feeder  for HF, returning the horizontal quad loop top
hat   to   its   original  purpose  from  time  to  time.  chris  (at)
chriswilson.tv  should  get  it to me when convenient, thanks. Are you
the same Ian Frith who writes the programming stuff for VHF / UHF rigs?


Monday, July 24, 2017, 4:41:36 PM, you wrote:

> 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