Interchangeability of Alliance Tenna-Rotors. Wire Charts .. Wire Chart for Extra Long Runs of Cable Use of 2 or more Controls on One Rotor. The U Tenna-Rotor includes a control box. (FIG. 1), rotor (FIG. 2), mast clamp (FIG. 3) and one hardware bag containing U-bolts, terminal cover. GENERAL INFORMATION. The Alliance Tenna-RotorĀ® Model U is a fully auto- matic unit. The control knob is turned to the desired di- rection and the rotor .

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I waited for many months for such an example to appear at a decent price because of wanting to document the entire system as originally supplied, so it was disappointing to have the cover missing.

Sometime I couldn’t get even relatively nearby stations no matter the orientation. The rotator box motor rotation direction is determined by which set of field coils is energized by the control box; i. I plan to make the best of the situation and exploit my local library’s MakerSpace facility’s 3D printer to make a replacement.

Vintage Alliance Model U Tenna-Rotor Installation (Kirt’s Cogitation #) – RF Cafe

Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. Lower quality copies are posted here in case they ever disappear from Norm’s Rotor Service website.

Load bearing surfaces are simple bushings rather than ball bearings, but the shaft will turn alliande little in tennna-rotor typical lifetime of use that it shouldn’t matter. Applying a torque to the output shaft, which is connected to the antenna, cannot cause the worm gear to rotate.


Mechanical drawings were located on the Norm’s Rotor Service website and Bougetoline has schematics, so I thank them for that.

My primary interest is being able to pick up radio stations since I rarely watch TV. When I first began planning an antenna installation, I was going to put it on the roof like in the old days, but I decided I would try it in the garage attic first to see how well it worked there. Everything looked good except the grease in the rotator was hard caked and needed to be cleaned off and replaced, which I did.

A huge collection of my ‘Factoids’ can be accessed from my ‘ Kirt’s Cogitations ‘ table of contents. Topical Smorgasbordanother manifestation of Factoids, are be found on these pages:. Doing so wouldn’t get me the classic antenna-on-the-roof look I wanted, but it would keep the antenna and rotator unit safe from the weather and it would probably last the rest of my lifetime.

Customer reviews of the new units reveal dissatisfaction with the weakness of the rotator unit that mounts on the antenna mast, tenna-rotor the inability of it to prevent the antenna from being rotated in a strong wind no brake or poor brake.

As you can see in the photos, the cast aluminum parts are very robust.

Slliance are a few companies AudiovoxChannel MasterRCA who still sell antenna rotators that are modern transistorized units with digital readouts.

A worm drive is like a mechanical diode in that only a rotation of the worm input motor drive shaft will cause the output shaft to rotate.

Tenna-Rotor U-100

Do you remember the signature ker-chunk, ker-chunk sound of that solenoid turning the controller dial? Control and feedback is about as simple as it gets with a motor turning the antenna mast and a solenoid in the control box that advances the dial as the antenna rotates.


All pertain to topics that are related to the allince engineering and science theme of RF Cafe. A half-wave folded dipole has been used for many years, but because of where my house is located reception quality varies throughout the year and according to the weather. The seller found it in his father’s attic. Topical Smorgasbordanother manifestation of Factoids, are be found on these pages: A photo of the cover will be added here when it is available.

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged. If you grew up in the era of rooftop television antennas, then there is a good chance you are familiar with the electromechanical antenna pointing systems that were often installed as well.

Cams on both ends open and close contacts as required. It is possible for the wind or some other force to prevent the antenna shaft from turning as the worm gear tries to turn, which would strain or stall the motor, tenja-rotor it cannot be forced forward or backward.

Often time I would need to re-orient one or both sides of the dipole to get good pickup. That was one of the reasons I wanted this old system, just to hear allkance sound again.