[TowerTalk] [Tower Talk] 7 wire rotator cable

[Dick Williams]

Jack,

That 7 wire cable will work with any of the Ham M series, Tailtwister, etc. 
rotors.  You really only need 6 wires in the first place (though 8 is 
better).

The "trick" is to mount the phasing capacitor that is in the control box at 
the rotor (which is where it should be anyway, and the far majority of hams 
with any length of rotor cable run do this).   I have five Tailtwisters/Ham 
IV's with runs of up to 450 or so feet and have the capacitors mounted on 
the tower by the rotors.   This "trick"  frees up two wires going to the 
control box (lugs 4 & 8).

Doing this has two advantages:  first, it mounts the phasing capacitor right 
at the motor where it will work the best; and second you can then run double 
wires to the motor itself and cut the voltage drop considerable (use the 
wires originally going to 4 and 8  in parallel with the wires going to 5 and 
6).

So, if your rotor run isn't too long just use 6 wires and for go paralleling 
two more with the wires going to 5 and 6.  At least you will get the 
additional torque by having the capacitor at the rotor.

Dick  K8ZTT



> Quoting Jack - K4WSB <k4wsb at arrl.net>:
>
>> I purchased an 500' spool of wire labeled 'antenna rotor' wire
>> The price was [very] right.  However, I'm curious; who makes a
>> rotator which uses 7 wires?
>>
>> Have not found anything using google
>>
>>
>> Jack Hartley
>> K4WSB / VP2MSB
>> ARRL - QCWA - OOTC
>> DXCC Honor Roll
>>
>>
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