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Re: Lightening and mast mounted preamps



Hello John,
   guess it would depend on the type of preamp, but Icom ones for example are out of the RF path when not powered, so if the
rig is off or the preamp is turned off they are relatively safe... would think most preamps operate the same way... a near miss
would have to induce a high enough voltage to jump the relay contact points inside the preamp...
73's
Kevin
WA6FWF

----- Original Message -----
From: "John Geiger" <johngeig@yahoo.com>
To: <sidewindersontwo@yahoogroups.com>; <amsat-bb@AMSAT.Org>; <vhf@w6yx.stanford.edu>; <newsvhf@mailman.qth.net>;
<nwwsvhf@mailman.qth.net>
Sent: Saturday, March 08, 2003 1:55 PM
Subject: [amsat-bb] Lightening and mast mounted preamps


> I have a question that I have not seen addressed
> before.  Asked my friend Don, NL7CO, who is a big VHF
> operator, and he didn't know but said put it on the
> reflector, so here it is.
>
> We generally unhook our antennas during thunderstorms
> because a nearby lightening strike can cause enough
> energy to burn out the receiver's front end-or at
> least important components in the front end, like the
> RF amp.  What happens with mast mounted preamps?  You
> usually cannot unhook the coax from them during a
> thunderstorm.  Do they have some sort of protection
> device built in to handle surges down the coax?
>
> WOuld be interested to know, as we get pretty good
> thunderstorms around here.
>
> 73s john NE0P  EM04to-Lawton, OK
>
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