[Elecraft] Coiled Coax Choke

[david Moes]

what ever it was in the balun I purchased and took apart so Im not sure.

David Moes
President: Peterborough Amateur Radio Club.
dmoes at nexicom.net
VE3DVY,  VE3SD

On 10/21/2014 09:49, Michael Walker wrote:
> David
>
> What mix of ferrites are you using?
>
> Mike va3mw
>
>
> On Tue, Oct 21, 2014 at 8:29 AM, david Moes <dmoes at nexicom.net> wrote:
>
>> You say a 1:1 balun.    What type is it and  should it not be preventing
>> common mode currents?   If not Id consider one that will rather than adding
>> a choke.  I bought a commercial 1:1 Balun  opened it up and found it to be
>> just a length of RG8X looped once inside the casing with half a dozen
>> ferrites around it.  What I have done is have ground rods at the base of
>> the pole.   I am using a 10-80 +warc fan dipole that looks a little like a
>> flattened spider web supported with guyed camouflage tent poles to about 40
>> ft   I have 6 ferrites on the coax at the feed  the ones I got out of the
>> commercial balun. Then at the base I have several 5 ft copper pipes driven
>> into the ground  around the pole about 5 ft apart  all bonded together with
>> 6 gauge bare copper that is also burred a few inched below the surface
>> safe from the lawn mower.  I have a barrel connector at the base that lets
>> me connect the shield  to this ground    I have no common mode issues. at
>> least I have not experienced any.
>>
>>
>> David VE3SD
>>
>> On 10/20/2014 22:28, Dauer, Edward wrote:
>>
>>> I am thinking of adding a coiled coax common-mode choke to my system.
>>> Presently it goes K3-KPA500-KAT500 then 100 ft coax to the base of an
>>> inverted Vee¹s center support pole (collapsible fiberglass), then 30 feet
>>> up the pole to a 1:1 balun feeding a fanned 10-15-20 Vee.  The idea, for a
>>> couple of reasons, is to put the choke at the base of the pole, something
>>> I haven¹t seen discussed in the literature.  Two questions I am wondering
>>> about:  1. The choke would be 100 feet from the tuner and about 25 feet
>>> from the antenna/balun.  Probably not as good as having it right at the
>>> Vee, but is that compromise worth while?  2.  For appearance sake I am
>>> thinking about winding the coax around the base of the support pole.  It
>>> is 2 inches in diameter but I could slip a 3 inch PVC over that section to
>>> increase the diameter.  Anyone know an algorithm for determining the
>>> number of turns in the winding if I do that?  I would be much obliged for
>>> any thoughts and suggestions . . .   Tnx!
>>>
>>> Ted, KN1CBR
>>>
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