[TowerTalk] Common mode choke.
Mike Reublin NF4L
nf4l at comcast.net
Thu Oct 9 15:59:24 EDT 2014
Thanks Roger.
Yeah 75 & 160 slopers, common feed. The tower is a 72' crank-up. We'll see how it plays.
73, Mike
On Oct 9, 2014, at 3:44 PM, Roger (K8RI) on TT <K8RI-on-TowerTalk at tm.net> wrote:
> On 10/9/2014 3:37 PM, Roger (K8RI) on TT wrote:
>
> Don't know if this went or not.
>
> 73
>
> Roger (K8RI)
>
>> On 10/9/2014 3:01 PM, Mike Reublin NF4L wrote:
>>
>> It works OK for me on a center fed half wave. A single choke at the feed point wasn't sufficient, so I added a second where the feedline reaches the tower. The choke is right against the tower . With the single choke and the highly imbalanced 75 meter fan dipole when the power reached about a KW IIRC all the controled LEDs would light. At the legal limit, they were bright. When I added the second choke, located st the 20' level on the tower, the RF in the shack disappeared even with the amp at the full legal limit with a steady carrier.
>>
>> Yes, I'm sure the tower affects it, but it works. You didn't say what bands your half slopers are on, but I assume 75 and maybe 160. To get a 45 to 60 degree angle on 160 takes a tower of 100' or more
>>> I wrapped the coax for my 1/4 wave slopers thru 6 toroids. The bundle hangs so it touches the tower. Zat OK?
>>>
>>> 73, Mike NF4L
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>>
>>
>> --
>>
>> 73
>>
>> Roger (K8RI)
>
>
> --
>
> 73
>
> Roger (K8RI)
>
>
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