Jim Miller wrote:
> Rain, interesting thought. Can they be mounted horizontally so the raindrop
> will not tend to close the gap? OR the contacts separately mounted up at 45
> degrees with the contact points of EACH pointed up so the rain will run away
> from the spark gap? Can they be shielded? With a plastic soda bottle or a
> plastic kit box?
>
>
Use a plain old fashioned automotive spark plug screwed into a piece of
grounded pipe.
Roger (K8RI)
> I haven't seen these things but have been considering one and the pictures
> seem to be from a museum or belong in a dungeon or something.
>
> 73, Jim
>
> ----- Original Message -----
> From: "jim Jarvis" <jimjarvis@optonline.net>
> To: <towertalk@contesting.com>
> Sent: Monday, October 06, 2008 7:40 AM
> Subject: Re: [TowerTalk] spark gap/ insulated tower
>
>
>
>> Todd wrote:
>>
>> I recently erected an 80' base insulated Rohn 25G tower. It is
>> guyed with
>> philystran cable. I have been told that I should install a spark gap
>> at the
>> base insulators. If this is the case, what should the gap be for such a
>> spark gap? I currently have 2 brass straps 1.5" wide X 1/4" thick
>> from the
>> top and bottom of the insulators. The gap is 3/16" wide. Any advice is
>> greatly appreciated. Todd, WA7U
>> -0-
>>
>> Todd, it somewhat depends on the shape of your gap materials.
>> Broadcast towers have balls, the spacing of which can be varied,
>> depending
>> on power levels involved.
>>
>> 3/16" may be just fine for you. You don't want it arcing over at
>> full power, even when
>> it's raining. But you want it spaced as closely as possible, beyond
>> that.
>> The arc-over situation will vary, depending on whether you have
>> pointed metal
>> to pointed metal, or to a flat plate, or other shape.
>>
>> So, no simple answer will be correct.
>>
>> N2EA
>>
>>
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>>
>>
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>
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