[TowerTalk] Wiring Sky Needle tower for 220 VAC
wa6zty at yahoo.com
Tue Nov 5 15:37:33 EST 2013
A 10 volt filament transformer can be wired autotransformer style to pre-compensate for the Cu drop.
> From: Richard Karlquist <richard at karlquist.com>
>To: towertalk at contesting.com
>Sent: Tuesday, November 5, 2013 9:31 AM
>Subject: Re: [TowerTalk] Wiring Sky Needle tower for 220 VAC
>On 2013-11-04 22:48, Ray Benny wrote:
>> I have an older 90 ft Triex Sky Needle that I have been working on. I'm
>> down to the wiring of the raising/lowering motor. Because of the long
>> distance, I ran four conductors (250 ft) of #10 wire. The motor current
>> draw for 220 VAC is 9 amps, versus 18 amps for 110 VAC. There would be
>I had exactly the same situation with my HDX-5106 and the motor
>worked (barely) with 4 #10 250 feet on 120VAC. I have since moved
>the shack much closer so this problem went away, but if I had
>not, the plan was to put a 240VAC to 120VAC transformer at the tower.
>This seemed to be much easier (and idiot proof) compared to monkeying
>around with the electrical stuff at the tower. I have a number of
>big transformers I have acquired over the years. Anything with dual
>primaries can be wired as a step down autotransformer (you don't
>need isolation). Also, a 120VAC isolation transformer can be wired
>as an autotransformer. I picked up a 5 kVA unit at a swap meet.
>As an autotransformer, it is good for 10kVa.
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