[Elecraft] Balun Questions

[Wes (N7WS)]

Bob,

It appears that you're of a mind that the winding (coax) is tightly wound around 
the core.  That's not how some guys are doing it.  It's just loosely looped 
through the core. See fig. 36 in Jim's paper.

Wes


On 2/7/2016 10:03 PM, Bob McGraw K4TAX wrote:
> 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?????
>>
>>
>
>
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