Matching with a shunt coil across the feedpoint is one way. 12 turns no. 12
solid on 1.5" ID PVC has worked for me for 160m. 6 turns for 80m.
73/Jon
Jon P. Zaimes, AA1K Tower climber for hire http://www.aa1k.us/ Cell:
302-632-2353email: jz73@verizon.net or aa1k@arrl.net
-----Original Message-----
From: WW3S <ww3s@zoominternet.net>
To: Jeff Blaine <KeepWalking188@ac0c.com>; towertalk@contesting.com
<towertalk@contesting.com>
Sent: Thu, Jun 30, 2022 9:16 pm
Subject: Re: [TowerTalk] Resistor Across a Choke Balun
so what is the best way to drain static off a vertical with either a
resistor or choke?
------ Original Message ------
From: "Jeff Blaine" <KeepWalking188@ac0c.com>
To: towertalk@contesting.com
Sent: 6/30/2022 8:49:31 PM
Subject: Re: [TowerTalk] Resistor Across a Choke Balun
>After getting my hands on a floating 80m vertical one summer and then getting
>up off the ground, I decided then and there that the 50K 200W resistor in my
>junk box could do some good and maybe save me a future surprise. Ran it that
>way for a few years until it came down in 85 mph winds once night. Never got
>shocked again. I'm more careful now - don't need to learn that lesson more
>than once...
>
>73/jeff/ac0c
>alpha-charlie-zero-charlie
>www.ac0c.com
>
>
>On 6/30/22 7:45 PM, Jim W7RY wrote:
>>You are correct Ed.
>>
>>73, Jim W7RY
>>
>>On 6/30/2022 7:01 PM, Edward McCann via TowerTalk wrote:
>>>I think the query had to do with static-relieving resistor or choke across
>>>his antennas terminals effective at DC, if I read it correctly.
>>>
>>>Ed McCann
>>>AG6CX
>>>
>>>>On Jun 30, 2022, at 3:34 PM, Jim Brown <jim@audiosystemsgroup.com> wrote:
>>>>
>>>>On 6/30/2022 2:57 PM, KD7JYK DM09 wrote:
>>>>>I've looked on and off over the years for a tutorial, but not had any
>>>>>luck, can anyone suggest a route of study for me?
>>>>Yes. k9yc.com/RFI-Ham.pdf includes an extensive tutorial on how ferrite
>>>>chokes work, as well as a lot of other fundamental EMC concepts.
>>>>
>>>>k9yc.com/publish.htm includes two choke "Cookbooks," one for MF/HF, another
>>>>VHF/UHF. The MF/HF cookbook is based on more than a year of winding and
>>>>measuring more than a thousand chokes; the VHF/UHF cookbook is based on
>>>>Fair-Rite data sheets for specific cores. This material has been in the
>>>>ARRL Handbook for a while.
>>>>
>>>>There's also an applications note on identifying RF noise by type and
>>>>providing advice on how to locate and kill it. It includes winding
>>>>guidelines for clamp-ons at the source of noise.
>>>>
>>>>73, Jim K9YC
>>>>
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