[Elecraft] Antenna static charge precautions - any tips?

[Ron D'Eau Claire]

Ha, ha!  A simple check is to terminate the TX in a dummy load, then add the
choke and see if the SWR changes significantly on any of the bands where you
might transmit. 

73, Ron AC7AC

-----Original Message-----
From: hawley, charles j jr [mailto:c-hawley at illinois.edu] 
Sent: Sunday, September 09, 2012 9:04 AM
To: Ron D'Eau Claire
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Antenna static charge precautions - any tips?

I'll keep an eye on it :)

Sent from my iPhone

On Sep 9, 2012, at 10:53 AM, "Ron D'Eau Claire" <ron at cobi.biz> wrote:

> Many antenna systems do not require this protection. They are shunt 
> fed which provides a direct-current short across the feed line at all
times.
> 
> Chokes may work fine, but all chokes have some parasitic capacitance 
> across the windings which means they have a series resonances 
> somewhere across the RF spectrum. At those points the choke will 
> greatly disturb the impedance presented to the rig and absorb RF, even to
the point of catching fire!
> 
> 73, Ron AC7AC
> 
> list: http://www.qsl.net/donate.html