[TowerTalk] Common mode choke.

[Mike Reublin NF4L]

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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