[Elecraft] Balun Questions

[Bob McGraw K4TAX]

I am speaking of the radius of the coax bend.   To have a coax bend 
radius of 3" the torroid would be huge.......the size of a large coffee 
can.  A 3" OD, x 1.5" ID   torroid would typically have a winding radius 
of less than ~1", even with 2 stacked cores.    For my "ugly balun" 
project I use 4" ID PVC which has an OD of ~4.5" and which provides a 
bend radius of 2.25".

73
Bob, K4TAX



On 2/7/2016 10:32 PM, Chuck Catledge wrote:
> It’s quite practical to use 25 to 35 mm radius bends of RG400 for large ferrite cores including both the one-piece and the snap-on varieties.  RG400 has the same diameter as RG-58, i.e. 0.195”.  See K9YC’s tutorial here:
>
> http://audiosystemsgroup.com/RFI-Ham.pdf
>
> All of the RF common mode chokes I have made using small cable (i.e. RG400 through RG6) use radii of 1-3 inches with the RG6 tending toward 3” and greater due to the foam dielectric.
>
> ---
>
> Chuck, AE4CW
>
> From: Mel Farrer [mailto:farrerfolks at yahoo.com]
>
> Subject: Re: [Elecraft] Balun Questions
>
>   
>
> SORRY, but the min static bending radius for RG-303 is 25 mm and RG-400 is 35 mm.  For torroid wrap which is better?????
>
>