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Message-ID: <07d101c75de9$8355a620$7900a8c0@athlon1200>
From: "Dave Brown" <tractorb@ihug.co.nz>
To: <rsgb_lf_group@blacksheep.org>
References: <002101c75b37$1e370680$6401a8c0@JAYTERMINAL> <001701c75b40$54bc2740$6901a8c0@AIRPORTTERMINAL>
Date: Sun, 4 Mar 2007 12:13:10 +1300
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Subject: LF: Re: Re: [Lowfer] Protecting E probe antennas in near field of LF TX antennas
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Status: O

Thanks for all the comments on this-Jay and the others.
Those of you who have a protective relay in service in an E probe-have 
you any recommendations to make as regards the mechanical layout?

Keeping the stray C to a minimum is obviously the main requirement, 
along with short ground path when the relay is shorting the E probe 
input. For maximum protection, isolating the probe antenna seems to 
also be desirable, which is why I was thinking along the lines of the 
Dow Key relay arrangement with a double sided spring loaded contact.
But I guess any relay that has low stray and intercontact capacitance 
(contacts open) and reliable grounding via a short path (contacts 
closed) will do the trick.

 73
 Dave, ZL3FJ