[TowerTalk] shut fed tower and rotator (clarification)

K8RI on TT k8ri-on-towertalk at tm.net
Sun Feb 13 11:15:41 PST 2011


On 2/13/2011 1:53 PM, K8RI on TT wrote:
> On 2/13/2011 1:25 PM, Gary Slagel wrote:
>> I recently built 2 verticals for 80 and 160 by shuntfeeding my tower.  They both seem to load nicely and are broadbanded, partly because of an insufficient radial system.
>>
>> When I transmit on either 160 or 80 the meter on my rotator controller deflects.... this makes sense since I'm running rf right through the rotator.   Till now I've run only 100 watts thru the antennas but I'd like to see if the antennas will handle a KW ok.   I'm wondering if there's any chance of damage to the rotator (Ham IV) if I do this.   I'd guess not but it makes me a little nervous.
> <snip>
>
> The chokes/baluns I used were 5, 2.4" 31 Mix toroids with 5 turns of
> LMR-400.
Most probably understood what I meant, but just-in-case:
I should have said that the choke consists of 5 turns of LMR-400 on a 
stack of 5, 2.4", 31 mix toroid cores.

73

Roger (K8RI)
> I'd try one in the rotator cable near the control box to see what happens.
>
> Read Jim Brown's (K9YC) RFI tutorial
> http://www.audiosystemsgroup.com/RFI-Ham.pdf about toroids, RFI, baluns,
> and audio interfacing.  It's well worth the time.
>
> 73
>
> Roger (K8RI)
>>
>> Currently 10 watts deflects the meter about 10%.  100 watts deflects it about 25%.
>>
>> Anyone have a thought on this?
>>
>> Thanks,
>>
>> Gary Slagel
>> Hot Springs, SD
>> N0SXX
>> http://marina.fortunecity.com/sanpedro/351
>>
>>
>>
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