[Boatanchors] How much is too much?

[Carl]

Thats very simple to fix, use a bias voltage on the neon.

Carl
KM1H


----- Original Message ----- 
From: <w8au at sssnet.com>
To: <boatanchors at mailman.qth.net>
Sent: Saturday, January 29, 2011 10:53 PM
Subject: Re: [Boatanchors] How much is too much?


> At 07:33 PM 1/29/2011, Jim Haynes wrote:
>>I recall some old military tube equipment that had something like a neon
>>bulb across the antenna terminal to ground.  Doesn't seem like that would
>>limit the voltage enough, but maybe it did.
>
> The old military receiver input Z's were typically 300 ohms or more, plus
> the separate receiving antennas could approximate hi-Z also.  This
> made NE-2 neons somewhat protective at an ionization voltage of 85-90 V.
>
> Today, at 50 ohms Z, neons would not be
> effective.  (Watts=E2/R)  90(squared)/50= 162W (!)
>
> Consider checking out the Navy R-1051G receiver input protection circuit, 
> if
> you are serious about mutual coupling of close antennas.  It provided an
> instantaneous hi-level attenuator switching arrangement.
>
> Perry  w8au
>
>
>
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