[Lowfer] Common Mode Chokes (was Active Whips)

[Douglas D. Williams]

I count twenty turns. I did another one with just two cores glued together
and was about to get about thirty turns through that one. I have them
connected in series on the coax between the indoor dc power coupler and the
antenna, so they have dc voltage going through them. Thought about putting
another one at the base of the antenna, but that would just introduce
another point where moisture might get into the coax...

I also used those same toroids on all my DC power leads inside the shack,
wrapping as many turns as I could through them each time. I have
some toroids left over, so I may do all my USB and CAT5 cables next, lol.

73, Doug KB4OER

On Thu, Jan 24, 2013 at 7:00 PM, Dexter McIntyre W4DEX
<dexter.mc at gmail.com>wrote:

> Thanks for the info Doug.  The coax you used looks a bit larger in
> diameter than the RG-174 I'm familiar with.  How many turns did you get
> through the 23 mm ID of the cores?  Looks like maybe 30?
>
> Dex
>
>
> Douglas D. Williams wrote:
>
>> Regarding the Clifton Labs common mode choke plans, once I told Jack at
>> Clifton Labs that I was mainly interested in 8 kHz to 500 kHz reception
>> and
>> was planning on building one of his common mode chokes he told me, and I
>> paraphrase, to glue five 40T1417-10H (Digi-Key part # 240-2537-ND)
>> together
>> and to wrap as many turns of RG-174 through them as I could fit. This I
>> did.
>>
>> https://dl.dropbox.com/u/**33457409/common%20mode%**20choke.jpg<https://dl.dropbox.com/u/33457409/common%20mode%20choke.jpg>
>>
>> 73, Doug KB4OER
>>
>>
>>
>
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