[TowerTalk] Feed Point Choke Question

[Artek Manuals]

Kirk

The short answer is how tight you make the turns will have little real 
world effect. Use the RG-8X I would probably use the #31 core over the 
43 . The poor mans 8 turns of coax 4-5" in diameter without ferrites 
will probably actually work as well. Depending on SWR and feed line 
dressing (always perpendicular to the plane of the beam the need for 
choke at all� is arguable .

Dont forget you guys up north get several dB of extra gain for erecting 
antennas in subzero weather and another 1dB bonus if done during a blizzard.

Dave
NR1DX

On 11/6/2020 2:39 PM, Kirk Kleinschmidt via TowerTalk wrote:
> Hi, gang,
> I'm racing the arrival on Minnesota's winter, and I need to install a 
> hexagonal beam on top of my short test tower.
> In the past, when building RF chokes onto FT-240-43 or FT-240-31 
> ferrite cores, I wrap the turns tightly around the core. With my RG-8X 
> rotator loop, I'm not sure that I should wrap them so tightly?
> The G3??? Hex Beam SK from karinya.net tested a bunch of RF chokes, 
> and one of his recipes that should work for a 20-10 antenna is 5 turns 
> of RG-58 around an above-mentioned Type 43 core.
> Question: Do I have to wrap the turns tightly (risking center 
> conductor migration?), or can I loop the 5 turns through the core with 
> a 2-inch bending radius?
> If that makes a difference, should I add additional 2-inch-radius 
> loops? I tested and can get as many as 10 turns through the core.
> NOTE: I do not have time to purchase different cores, cables, etc. 
> Winter is 48 hours away. :)
> I have suitable lengths of RG-58, RG-8X, RG-213 (don't wanna cut it 
> tho), LMR-240, RG-6 quad, LMR-400 clone (can get from a fellow ham) on 
> hand to make this rotator loop/choke. I have FT-240-43 and FT-240-31 
> cores on hand,
> Thanks, as always,
> Kirk, NT0Z
>
> My book, "Stealth Amateur Radio," is now available from 
> www.stealthamateur.com and on the Amazon Kindle (soon)
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-- 
Dave Manuals at ArtekManuals.com www.ArtekManuals.com


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