Tenna-Rotor® consists of two units: the
rotor unit, which mounts on the mast below the Antenna
and the control box, which is placed on or about the TV
receiver. These are interconnected by a four- or
The theory of operation concerns two separate circuits.
The first is the power circuit, which in all Tenna-Rotors®
transmits the power that actuates the motor and rotates
. The second is the indicator or signal circuit,
which reports the rotor’s progress back to the control
box. In the K-22
the signal circuit turns on the panel
light when the rotor reaches the stop or end of rotation.
In the T-10
the signal circuit
registers the Antenna
direction on the control box
indicator. The signal circuit in the U-83
actuates the escapement assemblies, causing the rotor
to turn to the desired position automatically.
The Model C-225
is an automatic, transistorized unit
using a unique patented Phase-sensing unit. The use
of this bridge circuit results in extreme accuracy,
quiet operation of control, and constant synchronization.
Rotation is attained from a reversible, capacitor-type
24 volt, AC motor and is limited by mechanical stops
within the rotor housing. The U-83
controls are protected by a thermostat within the rotor
or control assembly.
Tenna-Rotor® Models K-22
produced after June 1, 1958, have been changed from a
speed of 2 RPM to a speed of 1 RPM.
This change makes possible better orientation for
“color” and “black and white” television reception,
improves torque, braking, and general overall performance.
Kits are available to convert the T-10
T-12, and U-98
rotors manufactured before June 1, 1958,
to 1 RPM.