Lee,
My tower is not 750ft away, however, 750 ft. should not be a problem for the
position indicator. The problem would be the loss of power to the rotor
motor. I would suggest he install a power supply and relays for the
motor/brake at the base of the tower and operate the relays with the
existing controller.
I have a Prop Pitch drive motor on my tower and have this arraignment. My
controller activates the relays at the tower. I am using the conventional
azimuth feedback from the position pot. This position pot current is very
low, so the 750 ft. should not present a big loss. The controller
calibration should have enough range to compensate for the small loss. The
relays can be operated by the same motor power supply and activated by using
a TIP-120 Darlington power transistor. This would virtually eliminate any
high current requirements from the controller. A Darlington transistor could
also be incorporated into the position feedback if necessary.
All lines should be bypassed at each end to avoid RFI/static interference.
* 73's Jim W5IFP *
>-----Original Message-----
>From: towertalk-bounces@contesting.com
>[mailto:towertalk-bounces@contesting.com]On Behalf Of Its from Onion
>Sent: Wednesday, January 14, 2009 5:26 AM
>To: A TOWER TALK GROUP
>Subject: [TowerTalk] Rotor control
>
>
>I have a question that was asked of me and I thought I would
>put it to the group.
>
>A friend needs to control his rotor from a rather long distance
>of 750 feet away.
>My first thought was ditch the 'traditional' rotor box and just
>run power to a step-down transformer
>of the correct value and use wireless video for a 'spotter' to
>check direction.
>Then I thought, is there a company that builds a digital
>encoder/decoder for this exact application?
>Of course, lighting protection is always a issue.
>
>BTW, thanks everyone on the dipole help. The wire went up
>Sunday, but Monday I gave birth
>to a 1.2mm bouncing baby kidney stone! It was my first and,
>WOW! Anyway, the dipole is delayed
>a bit while I recoup.
>Also to answer another question about that antenna, it is for
>mulit-band use and I live on a hillside
>so an inverted 'L' was a no go first off.
>
>Thanks all and
>
>73,
>Lee
>KE4VYN
>HTTP://WWW.QRZ.COM/CALLSIGN/KE4VYN<http://www.qrz.com/CALLSIGN/KE4VYN>
>
>
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