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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 17:42:09 +0100
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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: [email protected]
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: [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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