Bob: I have used PP rotators for many years. I found a pot coupled to the PP
by small chain or dial cord works well. Indicator was a large meter. I used
a small variac into a xfmr/rectifier for smooth start-stop on large antennas
(full size 40m beam). I believe M2 has one version of the controller used
for the 2800 that is modified for PP use and they supply the spinning
magnet/magnetic switch pulse generator. If you go to K7NV web page you will
see how a pro handles the conversion of PP motors to rotators.
Of course, the PP motor top and rotation indicator must be protected from
the wx. You can seal around the mast exit with a modified funnel upside down
and a bit of soldering. I have also used a rubber feeding dish upside down
as available at farm stores for the same purpose.
73, Dan, N5AR
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com]On Behalf Of Bob Maser
Sent: Sunday, March 16, 2008 10:50 AM
To: Towertalk
Subject: [TowerTalk] Prop Pitch Power Supply and Control Circuit
I am in need of a schematic for providing an adjustable 24VDC for a small
prop pitch. Also need a circuit for controlling the direction other than
selsyn motors. I understand that some people have used a Hall effect device
and a magnet mounted on the PP motor shaft.
Bob W6TR
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