[Elecraft] Grounding, Lightning & Attic Antennas

[Fred Jensen]

And all other cables entering the house.  Much of the damage caused by 
lightning stems from currents induced in conductors entering the house 
caused by the intense electromagnetic fields.  Lightning is an RF event.



73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

Ray Maxfield wrote on 7/29/2023 10:39 AM:
> If you are using Attic Antenna's ......
>   I would focus on the Power lines.
> wa6vab Ray k3
>
> On Sat, Jul 29, 2023 at 10:11 AM Rick NK7I <rick.nk7i at gmail.com> wrote:
>
>> Heh, try Hardee board (concrete) or aluminum siding, or stucco (wire
>> based to hold it together).  Or clay brick roofing.
>>
>> BUT that also contains wifi within the structure for network security hi
>> hi.
>>
>> If the antenna choice is HOA based (yuck, ick, ew) perhaps laying the
>> invisible wire ON the roof will work (better) for you (install on a week
>> day while everyone is at work/school).  The other issues include potent
>> RFI in the building (smoke detectors are great receivers, particularly
>> on 40M; GFCI devices are second best).
>>
>> 73,
>> Rick nk7i
>>
>> On 7/29/2023 9:46 AM, Dr. William J. Schmidt wrote:
>>> A bigger concern for attic antennas is the use of "radiation shield"
>> plywood on the roof of houses build in the last 10 years or so that turn
>> the attic into a Faraday cage.  The single most annoying reason cell phones
>> don't work inside your houses anymore.
>>> Dr. William J. Schmidt - K9HZ J68HZ
>>>
>>>
>>> -----Original Message-----
>>> From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net>
>> On Behalf Of Steve L
>>> Sent: Saturday, July 29, 2023 10:42 AM
>>> To: elecraft at mailman.qth.net
>>> Subject: [Elecraft] Grounding, Lightning & Attic Antennas
>>>
>>> Jim & Co.,
>>> I’m reading all the recent posts on the Elecraft reflector concerning
>> lightning protection…
>>> After a recent move, I am working on the design and construction of
>> attic antennas for both HF and V/UHF.  The topic of grounding and/or
>> providing lightning protection for this installation has baffled me given
>> no outside presence of any antenna components.  While not so concerned
>> about a direct strike (perhaps naively?) I am concerned about induced
>> currents and resulting equipment damage - where clearly disconnection may
>> be the best protection.
>>> Might anyone have any good references for reading/study on grounding
>> recommendations, how to’s, best practices, etc. for attic antennas?
>>> Thanks a bunch,
>>>
>>> 73,
>>> Steve
>>> AA8AF
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