[TowerTalk] Long Cable for Yaesu Rotor
kz8e at wt.net
Mon Apr 21 09:18:29 EDT 2014
>From: Larry K4AB
>Sent: Sunday, April 20, 2014 12:41 PM
>To: Tower and HF antenna construction topics.
>Subject: [TowerTalk] Long Cable for Yaesu Rotor
>Does anyone have any experience with long runs of rotor cable
>for a Yaesu G-1000?
>I'm planning for a run of 400' and I'm thinking that maybe too long,
>even using the heavier cable.
You can figure this out.
The G-1000 specs 125' maximum runs of #20 wire. #20 is 1.015 ohms/100 ft. That leaves you with a max resistance budget of 1.26875 ohms for 125' of #20.
If you use #18 with a resistivity of .006385 ohms /ft then you can go to 198 ft and keep the same resistivity.
If you use #16 with a resistivity of .004016 ohms /ft then you can go to 315 ft and keep the same resistivity.
If you use #14 with a resistivity of .002525 ohms /ft then you can go to 502 ft and keep the same resistivity.
It looks like you need to use #14 to make the run and meet the requirements that Yaesu specified for a 400 ft run.
Make sure that the wire you do buy has these resistivity numbers or better. Not saying that smaller wire doesn't work, but thats not what Yaesu specified.
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