On Sat, 29 Jan 2005 20:36:13 -0600,
wrote:

I bought a house out in the boonies and I can only get tv from the
antenna, unless I spend a fortune on satellite. I dont watch it much
so the antenna is fine. The antenna has an Alliance Tenna Rotor on
the pole, but the control box is gone. I'd like to build a simple
control. I was told the motor needs 24volts, but is it AC or DC, and
how do I reverse it?. I know I wont have the pointer, so I will have
to go outside to see which way it is pointing, but as long as I can
move it. Does anyone have a schematic for this, and also know what
numbered wire screws do what on the rotor?

The other option is to buy a used control and there are some on Ebay.
The only problem is how do I know which one will work with my rotor.
Obviously it would have to be an Alliance brand, but beyond that, are
they all the same (other than appearance), or do I need a certain one
to match my rotor?

Thanks to all

The Other George (NOT Bush)


Mine is not for sale on eBay, but I have a control box that I used
with my rotor (which is now lost).

The control box says: Alliance Tenna Rotor. Model U-100, I just
tested it and it works. It has four wires at the bottom. It has
been modified so it rotates across the north and has to be reversed
from the south, in other words, you can swing past north going between
east and west, but if you go to the south, it stops at south and has
to go all the way around to get back to the south. It was an easy
change, but I had to constantly swing between north east and north
west.

write me at my call at towncorp dot net.


--
Buck
N4PGW

wrote in message
...

The antenna has an Alliance Tenna Rotor on the pole, but the
control box is gone. I'd like to build a simple control. I
was told the motor needs 24volts, but is it AC or DC, and
how do I reverse it?. I know I wont have the pointer, so I
will have to go outside to see which way it is pointing, but
as long as I can move it. Does anyone have a schematic for
this, and also know what numbered wire screws do what on the
rotor?

Alliance made several models of rotors differing in their
mechanism for indicating direction. However, the motor
requirements are virtually identical. You will find two motor
windings with a common connection. The motor is powered with
24 volts 60 Hz but in TWO PHASES. The second phase is supplied
by placing a non-polar electrolytic capacitor in series with
the transformer output. Using a center-off single-pole double-
throw switch, you can control the rotor direction.

Connect the common connection of the two motor windings to one
transformer lead. Connect each of the two winding leads to the
switch connections. Connect the switch common to the other
transformer lead. Then connect a 100 uF to 200 uF 50-volt non-
polar electrolytic capacitor between the switch connections.
[If you cannot find a non-polar electrolytic of the correct
value, two conventional electrolytic capacitors with their
cathodes (negative leads) connected together will work, using
the two anode (positive) leads as the non-polar capacitor.]

In the "off" position, obviously the rotor will not turn. In
either of the "on" positions, the transformer voltage will be
directly connected to one motor winding and the other motor
winding will be connected in series with the capacitor to the
transformer voltage. One position will provide clockwise
rotation and the other will provide counter-clockwise rotation.

This will turn the antenna. It's crude, but it works. You
will need to know which model of rotor you have to develop an
indicator circuit if you wish to go further.

73, Barry WA4VZQ

wrote:
The other option is to buy a used control and there are some on Ebay.
The only problem is how do I know which one will work with my rotor.
Obviously it would have to be an Alliance brand, but beyond that, are
they all the same (other than appearance), or do I need a certain one
to match my rotor?

Thanks to all

If you email me I can send you the service manual pages for the U98
rotor. You probably have a U100 and this should help you out.

73
Richard WB8KRN