[TowerTalk] Lightning Protection via gas tube devices

Adam Kennedy fuzzy at fuzzydice.net
Fri Jul 20 22:24:58 PDT 2012


I should say the 5Ghz stuff is PoE. The 6 and 11Ghz are all -48v DC 
powered in the shack.

On 7/21/12 1:21 AM, Adam Kennedy wrote:
> It runs IF and DC up an LMR600 run between the transmitter in the shack
> and the amplifier up top. The amp takes N-Type from the IF and has
> Waveguide out to the antenna(s). The 6 and 11Ghz stuff is all Ceragon
> brand, the 5Ghz is in the unlicensed band and has very short cable runs
> of a couple feet. The transmitters are fed by Ethernet cables with Power
> over Ethernet on the cable.
>
> On 7/21/12 1:07 AM, Jim W7RY wrote:
>> Gas tubes for 5, 6 and 11 GHz?   I bet the microwave down-coverts at
>> the back of the dish and your running 1/2 LDF down the tower. I've
>> never seen a lightning surge suppressor on a piece of waveguide at any
>> frequency.
>>
>> 73
>> Jim W7RY
>>
>>
>> -----Original Message----- From: Adam Kennedy
>> Sent: Friday, July 20, 2012 9:38 PM
>> To: towertalk at contesting.com
>> Subject: Re: [TowerTalk] Lightning Protection via gas tube devices
>>
>> We put gas tube lightning protectors at the bottom of every cable run
>> for our microwave (5, 6 and 11Ghz bands) links. At the half-way point
>> and at the top we install grounding kits to ground the shield of the
>> cable to a good ground. The Motorola R56 standards have some good tips
>> and standards to use for grounding of towers and feed lines. Feed line
>> ground kits aren't always cheap, but the first time they protect your
>> equipment from a lightning strike, they have already paid for themselves!
>>
>> On 7/17/12 2:46 PM, Larry Loen wrote:
>>> On the subject of lightning protection, is this sort of thing:
>>> http://www.l-com.com/item.aspx?id=21474  useful or advisable?
>>>
>>> Do I put one just at the base of the tower (and connect it to the
>>> tower ground system) or do I also have one next to the shack.
>>>
>>> I was looking into female-female SO239 type devices for use as the
>>> shack side ground for my coax (I'd have a connector box and then make
>>> sure the paired "SO239"s would then be grounded), but I wondered about
>>> this.
>>>
>>> The price isn't great, but what worries me more is the 0.4 dB
>>> insertion loss.  Or, is that at GHz frequencies only?
>>>
>>>
>>>
>>> Larry  Wo0Z
>>> _______________________________________________
>>>
>>>
>>>
>>> _______________________________________________
>>> TowerTalk mailing list
>>> TowerTalk at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/towertalk
>>>
>>
>


-- 
Adam "Fuzzy" Kennedy
W0FZY



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