It would seem logical to expect that that RF voltage on the cables would track
that of the tower at the same height so bringing the cables off the tower at
the lowest possible height should result in the least RF remaining on them. A
few ferrites wouldn't hurt either.
-Mike-
>________________________________
> From: "Joe Subich, W4TV" <lists@subich.com>
>To: towertalk@contesting.com
>Sent: Wednesday, August 27, 2014 12:32 PM
>Subject: Re: [TowerTalk] Topband: Shunt feeding tower
>
>
>
>As long as the cables are connected tightly to the tower/tower leg
>and shields are bonded to the tower top and bottom, you are not
>likely to see any problem. K6SE used crank up towers with the cables
>coming down the stand-offs without much reported problem but I don't
>have any details on his system.
>
>For several years in the early 1980s back in Ohio I used a half
>sloper - the tower was certainly "hot" in that configuration and
>there were no rotator/antenna switch issues.
>
>73,
>
> ... Joe, W4TV
>
>
>On 2014-08-27 2:19 PM, Herbert Schoenbohm wrote:
>> Larry if you use a 3 or 4 wire cage I understand that the cage itself is
>> what is doing most of the radiating and not the tower.
>>
>>
>> Herb, KV4FZ
>>
>>
>> On 8/27/2014 12:08 PM, Larry wrote:
>>> I believe it was ON4UN that suggested running cables inside the tower
>>> would help. I ran my cables inside but have not shunt fed my tower
>>> yet so I don't know if that will really help.
>>>
>>> 73, Larry W6NWS
>>>
>>> -----Original Message----- From: LB3RE LJ3RE Stein-Roar Brobakken
>>> Sent: Wednesday, August 27, 2014 8:35 AM
>>> To: Pete Smith N4ZR
>>> Cc: topband@contesting.com
>>> Subject: Re: Topband: Shunt feeding tower
>>>
>>> How is inteference on rotor or relay boxes?I thinking 1kw generate
>>> magnetic radiation into cables ??? How u solve this guys ?? Tnx
>>>
>>> ---Sent by iphoneLB3RE LJ3RE K3RAG ex: LA6FJAwww.lb3re.com ~ Rag ~
>>> Stein Roar Brobakken
>>> e-mail:post@lb3re.comhttp://la5o.wordpress.comwww.contesting.no
>>>
>>> Reading about 3-wire cages and the like, I feel a serious case of shunt
>>> envy. Mine is a single wire about 18 inches from one corner of my Rohn
>>> 25, connected to the tower at about 50 feet. I used an omega match with
>>> a couple of 3 KV transmitting variables, because my tower is quite tall
>>> for 160 (97 feet with 3 yagis, 2 on top) and I could not find a 50-ohm
>>> point.It was absurdly easy to adjust and seems to work quite well at 100
>>> watts. I'm sure there are better solutions (including Herb's), but this
>>> was really simple.
>>>
>>>
>>>
>>> 73, Pete N4ZR
>>>
>>> Check out the Reverse Beacon Network at
>>>
>>> http://reversebeacon.net,
>>>
>>> blog at reversebeacon.blogspot.com.
>>>
>>> For spots, please go to your favorite
>>>
>>> ARC V6 or VE7CC DX cluster node.
>>>
>>>
>>>
>>> On 8/26/2014 5:12 PM, Don wrote:
>>>
>>>> I would like to get on 160 this question most likely has been asked a
>>>> 1000 time but I need information as how or can I shunt feed my 55 ft
>>>> rohn 45 .
>>>
>>>>
>>>
>>>> Don
>>>
>>>> _________________
>>>
>>>> Topband Reflector Archives - http://www.contesting.com/_topband
>>>
>>>>
>>>
>>>
>>>
>>> _________________
>>>
>>> Topband Reflector Archives - http://www.contesting.com/_topband
>>>
>>> _________________
>>> Topband Reflector Archives - http://www.contesting.com/_topband
>>> _______________________________________________
>>>
>>>
>>>
>>> _______________________________________________
>>> TowerTalk mailing list
>>> TowerTalk@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
>
>
>>
>> _______________________________________________
>>
>>
>>
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>>
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