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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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. I plan to make the alliancw of the situation and exploit my local library’s MakerSpace facility’s 3D printer to make a replacement. A huge collection of my ‘Factoids’ can be accessed from my ‘ Kirt’s Cogitations ‘ table of contents.

That was one of the reasons I wanted this old system, just to hear that sound again.

Tenna-Rotor U98

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.

The seller found it in his father’s tenn-rotor. Customer alpiance of the new units reveal dissatisfaction with the weakness of the rotator unit that mounts on the antenna mast, and the inability of it to prevent the antenna from being rotated in a strong wind no brake or poor brake. Doing so wouldn’t get me the classic antenna-on-the-roof look I wanted, but it tdnna-rotor keep the antenna and rotator unit safe from the weather and it would probably last the rest of my lifetime.


Topical Smorgasbordanother manifestation of Factoids, are be found on these pages: All pertain to topics that are related to the general engineering and science theme of RF Cafe. I waited for many months for such an example to tenna-rofor at a decent price because of wanting to document the entire system as originally supplied, so it was disappointing to have the cover missing.

Lower quality copies are posted here in case they ever disappear from Norm’s Rotor Service website. 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.

Do you remember the signature ker-chunk, ker-chunk sound of that solenoid turning the controller dial? Topical Smorgasbordanother manifestation of Factoids, are be found on these pages:. A photo of the cover will be added here when it is available.

Alliance Rotor | eBay

The rotator box motor rotation direction is determined by which set of field coils is energized by the control box; i. Applying a torque to the output shaft, which is connected to the antenna, cannot cause the worm gear to rotate.

Load bearing surfaces are simple bushings rather than ball bearings, but the shaft will turn so little in a typical lifetime of use that it shouldn’t matter. Often time I would need to re-orient one or both sides of the dipole to get good pickup. Sometime I couldn’t get even relatively nearby stations no matter the orientation. Cams on both ends open and close contacts as required.

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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.

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.

My primary interest is being able to pick up radio stations since I rarely watch TV.

As you can see in the photos, the cast aluminum parts are very robust. There are a few companies AudiovoxChannel MasterRCA who still sell antenna rotators that are modern transistorized units with digital readouts.

Mechanical drawings were located on the Norm’s Rotor Service website and Bougetoline has schematics, so I thank them for that. 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 tenna-royor were often installed as well. 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 tenna-eotor stall the motor, but it cannot be forced forward or backward.

Everything looked good except the grease in the rotator was hard caked and needed to be cleaned off and replaced, which I did. All trademarks, copyrights, patents, and other tenna-otor of ownership to images and text used on tnna-rotor RF Cafe website are hereby acknowledged.