The Train-N-Track (TNT) system for Vixen's Porta II Mount is a basic alt-az motor drive system with adjustable or trainable tracking. With alt-azimuth mounts, the motor speeds will vary greatly depending on what area of the sky you are viewing. In some situations, the altitude motor will run very fast and the azimuth motor will run very slowly. In other areas of the sky, the opposite will be true. Completely computerized alt-az systems will track automatically in any part of the sky. The TNT, however, requires that you adjust the motor speeds for your position.
The adjustment, or training, is very simple. Once you become familiar with the process it can be accomplished in about 30 seconds and tracking will continue for 10 minutes or more without noticeable drifting. At that point you will need to do another simple training adjustment. Quick slewing can be accomplished, without adjusting the tracking speed, by simply pressing one key. This feature allows for re-centering an object without changing the carefully adjusted tracking speed.
The TNT motor drive system includes adjustable speeds on both axes and high speed centering. The friction drives also allow you to move the telescope around manually by hand at any time, in both altitude and azimuth, without unlocking any clutches. You just let go and the drive takes over.
The Porta Mount TNT is battery driven using 8 AA batteries and includes complete instructions. Installing the motors on the Porta II Mount is simple. (Porta Mount Sold Separately). TNT Motors shown on StarGuy Alt Az Mount (SG5863M) for reference, but mount is not included.
Manufacturer part number: SGTNT