[NJARC] question regarding long wire antennas

[Al Klase]

Matt,

The lead-in wire as well as the ground go to the radio.  The arrester, 
hopefully, shunts most of a lightning strike to ground outside the 
house.  Traditional arresters were typically simple air gaps, I'm 
guessing in the neighborhood of 0.01 inch.  Normally, the arrester is an 
open circuit.

For most of us, our antennas are lower than the nearby tree, buildings, 
and power lines, so the chance of a direct strike is minimal.  In this 
case, a simple arrester, and disconnecting the radios, especially solid 
state things is sufficient.

If your antenna is high and exposed, things get complicated.

Al

On 9/1/2017 11:10 AM, Matt Reynolds wrote:
>
> While we are on the subject, Can someone "explain like I'm five" how 
> the lightning arrestor works?
>
>
> You run a long wire in your backyard, all the way up to your window.  
> The arrestor has two terminals.  One goes to the long wire, the other 
> goes to a wire you ran to earth ground.
>
>
> Then what?  How does the antenna go into the radio then? Capacitive 
> coupling? or do you wire it into one of the terminals?
>
>
> I get that the idea is to put a path into ground as direct as possible 
> if the long wire is struck, but if you ran the wire directly to the 
> long wire terminal what's to stop it from going both to ground and to 
> the set?  I'm guessing you don't connect it to ground either.  If you 
> connect it to ground is the gap capactively coupled?
>
>
> I'm sure this is relatively simple to many of you, but I'm not sure if 
> I understand it correctly.
>
>
> Matt
>
> ------------------------------------------------------------------------
> *From:* njarc-bounces at mailman.qth.net <njarc-bounces at mailman.qth.net> 
> on behalf of Al Klase <ark at ar88.net>
> *Sent:* Friday, September 1, 2017 10:26:47 AM
> *To:* njarc at mailman.qth.net
> *Subject:* Re: [NJARC] question regarding long wire antennas
> Just remember
> Reply = Poster
> Reply All = Everyone
>
> _________________________________________________________
> Joe,
>
> Mike is correct.  KISS = keep it simple, stupid!  You might also want to
> think about a lightning arrestor or grounding switch if the antenna is 
> high.
>
> Al
>
> On 9/1/2017 9:08 AM, Mike Feher wrote:
> > Just remember
> > Reply = Poster
> > Reply All = Everyone
> >
> > _________________________________________________________
> > Joe -
> >
> > I suggest that you use the left over length as the feedline coming 
> into the
> > house and forget about coax. Unmatched coax can act like a big 
> capacitor and
> > ground all your incoming RF substantially. Regards - Mike
> >
> > Mike B. Feher, N4FS
> > 89 Arnold Blvd.
> > Howell NJ 07731
> > 848-245-9115
> >
> > -----Original Message-----
> > From: njarc-bounces at mailman.qth.net 
> [mailto:njarc-bounces at mailman.qth.net]
> > On Behalf Of Joe Giliberti
> > Sent: Friday, September 1, 2017 8:44 AM
> > To: New Jersey Antique Radio Club <njarc at mailman.qth.net>
> > Subject: [NJARC] question regarding long wire antennas
> >
> > Just remember
> > Reply = Poster
> > Reply All = Everyone
> >
> > _________________________________________________________
> >
> > ______________________________________________________________
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> -- 
> Al Klase – N3FRQ
> Jersey City, NJ
> http://www.skywaves.ar88.net/
>
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-- 
Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

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