[TowerTalk] Balun dimensions

[David Gilbert]

Type 31 is fine throughout the HF bands.  K9YC's Cookbook has specs and 
test data for chokes built with it ... not just opinion.

Dave   AB7E


On 6/25/2025 11:40 AM, Kirk Kleinschmidt via TowerTalk wrote:
> John,
> The type 31 material is optimized for 160-80 meters. Type 43 is generally used on the upper HF bands.
> I use 8-12 turns through FT-240 cores.
> Various online cookbooks may weigh in on that, but it has worked well for me.
> Regards,
> Kirk, NT0Z
>
> My book, "Stealth Amateur Radio," is now available from www.stealthamateur.com and on the Amazon Kindle (soon)
>
>      On Wednesday, June 25, 2025 at 12:42:19 PM CDT, John Geiger via TowerTalk <towertalk at contesting.com> wrote:
>   
>   The balun I was using on my TGM Communications MQ-26 miniquad died a couple of months ago. I came up with the idea today of making one myself since I have some extra RG58 I salvaged from a mobile antenna mount. I plan on running some turns of it on a FT240-31 ring torrid. Maybe 2 rings, one on top of the other. I need it to cover 14-50mhz. Any good idea as to how many turns through the ring I need?
>
> I have found some plans using a FT140-43 torrid but that looks pretty small to work with.
>
> 73 John AF5CC
>
> Sent with [Proton Mail](https://proton.me/mail/home) secure email.
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