Topband: Static Discharge Inductor

[donovanf at erols.com]

Hi Ray, 


Simply connect your 160 meter transceiver to a dummy load. 
If the VSWR meter in your transceiver isn't accurate, connect 
an external VSWR meter. Or use your hand held antenna 
analyzer or VNA if its accurate. 


Your VSWR should read near 1:1. 


Now connect your choke across the dummy load. A properly 
built choke should have no effect on the VSWR reading and 
as a result will not affect antenna performance. 


73 
Frank 
w3LPL 

----- Original Message -----

From: "Raymond Benny" <rayn6vr at gmail.com> 
To: "John Jolly" <wa7nwl at gmail.com>, "160" <topband at contesting.com> 
Sent: Friday, July 16, 2021 5:42:09 AM 
Subject: Re: Topband: Static Discharge Inductor 

Hank et all , 

The verticals base impedance is between 45 - 50 ohms. 

My issue is that I'm hoping to fit 1ea inductor into the 4"X 4" box at the 
base of each vertical. 

I have not checked Google yet, but did check the ARRL Antenna Handbook and 
my latest ON4UN Topband Book but very little was mentioned. 

I guess I could try to use smaller wire on a slightly larger diameter form 
to increase the resistance and impedance... 

Any suggestions? 

Ray, 
N6VR/W7YA 

On Thu, Jul 15, 2021, 5:40 PM John Jolly <wa7nwl at gmail.com> wrote: 

> HI, Ray - 
> 
> If you do a Google search on 'static discharge bleeders' or something like 
> that, there should be a ton of information show-up. Years ago I saw 
> inductors, resistors , diodes and combinations of those used on mobile and 
> fixed antennas. Gas-discharge devices are a newer option and available 
> from various vendors. With inductors, apparently they need to present a 
> high resistance at rf frequency but a dc-short at dc - examples and 
> discussions are online. Phil Salax has at least one article about how he 
> made his. 100uH seems to be a frequently listed value. 
> 
> 73, 
> 
> John, N7NWL 
> 
> On Thu, Jul 15, 2021 at 4:22 PM Raymond Benny <rayn6vr at gmail.com> wrote: 
> 
>> Here in Arizona, we are in our monsoon season, lots of thunder, lightning 
>> and rain. I have built two inductors to put across the base of my homebrew 
>> phased 80m verticals feed point. I have a small 4" X 4" weatherproof box 
>> at the base with a K9YC CMC enclosed and wondering if the inductors are 
>> adequate. They are 3 1/2" long, 3/4" diameter, 20ga enamel copper wire, 
>> with an estimated 93 turns. I have used several inductor calculators, they 
>> say between 32 and 34 uH. 
>> 
>> Is these adequate for use as a static discharge coil that will not affect 
>> the vertical antenna loading or performance? 
>> 
>> Thanks for your input. 
>> 
>> Ray, 
>> N6VR/W7YA 
>> _________________ 
>> Searchable Archives: http://www.contesting.com/_topband - Topband 
>> Reflector 
>> 
> 
_________________ 
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector