vixen porta mount with jmi tnt tracking
Posted 19 May 2013 - 01:30 PM
and are you happy with it? Is it worth it? Thanks Anthony
Posted 19 May 2013 - 03:02 PM
Anyway, JMI usually makes good stuff, and this seems to be made for the Porta Mount. The only thing would be your patience with having to continually adjust the tracking speeds, as it appears that the speed adjustments don't self-adjust the speeds of the individual axes as the mount tracks through various parts of the sky. Here's a blurb from ScopeCity's ad for the Train-N-Track for the Vixen Mount:
"The Train-n-Track (TNT) system 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."
Based on this, it appears that JMI's use of the word "train" may mean nothing more than "manually adjust the speed of either axis as the situation warrants it!" And it's also pretty apparent that this isn't adding GOTO capability to whatever mount you add it to.
So, this appears to be nothing more than a costly replacement for the slo-motion knobs you would normally use with a Porta-Mount. Depending on your particular needs, it may be a boon, or it may be a costly burden!
Welcome to Cloudy Nights, and good luck!
Posted 19 May 2013 - 06:14 PM
It is pricey so be prepared to follow the learning curve and spend a good deal of time with it if you decide to get it. Otherwise it will, as was said above, just be a costly (although much better) replacement for slo mo controls.
Posted 19 May 2013 - 07:34 PM
Posted 20 May 2013 - 12:06 AM