[TowerTalk] RF on Tower

[Kim Elmore]

I shunt feed my short (~55 ft) tower with a KLM KT-34A, a CushCraft 40-CD2 a DW3, a 2 m corner reflector and a discone and have never seen any adverse effects even at full legal limit. 

Kim N5OP 

"People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith

> On Oct 16, 2018, at 16:18, Jon Zaimes <jz73 at verizon.net> wrote:
> 
> I have used various shunt-fed and series-fed towers on 160 meters that had a
> variety of antennas, from UHF to HF, and rotors, and never had any issues
> with RF from 160 causing damage to things at the top. YMMV
> 
> 73/Jon
> 
> Jon P. Zaimes, AA1K
> Tower climber for hire
> http://www.aa1k.us/
> Cell: 302-632-2353
> 
> Reviews of AA1K tower work on eham website:
> http://www.eham.net/reviews/detail/12922
> 
> Hug your favorite tower every day, and always stay connected to it.
> 
> -----Original Message-----
> From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of N1BUG
> Sent: Tuesday, October 16, 2018 5:00 PM
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] RF on Tower
> 
> Every situation is probably a little different but I have a 100 foot tower
> with TH-11DX, 7 element 6 meter and 13 element 2 meter antennas. I have been
> shunt feeding it on on 160m running full legal limit without problems. My
> thinking would be that the choke is just a small inductor at 160m and
> probably doesn't have much RF voltage across it. Being so far up the
> vertical it probably has little current through it. In any case, mine has
> not had any problems.
> 
> 73,
> Paul N1BUG
> 
> 
>> On 10/16/2018 04:34 PM, Speer, Douglas via TowerTalk wrote:
>> I  have a phillystran guyed tower holding a Hy-Gain TH11DX and a Force 
>> 12 Delta 240 stack.  The stack is turned with a small prop pitch 
>> motor.  The TH11DX utilizes a LPA driven element combined with passive 
>> reflector and director elements.  The LPA driven elements are RF 
>> insulated from the boom but DC grounded through a small choke located 
>> at the 10m end of the LPA (out of reach from the tower).
>> 
>> Am I thinking correctly that I probably should NOT consider shunt 
>> feeding the tower or feeding it as a half sloper for risk of damaging 
>> the small choke or the prop pitch motor?  I would at times be running 
>> full legal limit to the antennas.
>> 
>> Doug, W5WTX Amarillo, TX
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