I affix my PC (Shuttle DS-81 or DS-87) to the pier, which limits the length required for USB & RS-232 cables.

Just to start at the basics. The keypad does not have 1600 as an option for mount type. What is the correct selection for the 1600 mount? Tom

You can do that if you wish. You will find nothing wrong whatsoever. The issue always was quite simple. Placing the scope in Park 1 position (scope on Wests side), then pressing Resume from Park1

In your opinion if I switch the date back to 2016 and let the scope park on the east side of the mount in Park 1, would there be any problem with that until the fix is released? Those who say it

Joe, BTW, you have to turn off the machine and start up again to see the change. Hope it helps. Steve

The problem bedevilled me too. I'm in S and when I first got the mount, I slided the switch to (what I thought was) S. I slided it one 'click'. Still, I was having a real headache, just like Joe.

Steve, You peaked my curiosity. The N/S switch on the CP3 panelis a “3-way” ? Checked mine, and it is a slide switch with no click stops, so I assume anyposition slightly left or right of

You might want to re-check the N/S switch. It's a 3-way switch - make sure it'shard over on N. Steve

Silly suggestion but make sure that you have tracking set to Siderealand not to Stop, Lunar or Solar. Christopher Erickson ConsultingEngineer Summit Kinetics Waikoloa,

-----Original Message----- From: chris1011 To: ap-gto Sent: Tue, Jan 12, 2016 11:22 am Subject: Re: [ap-gto] Tracking difficulties I am simply guessing because there was not enough information. In

It is about the same color red as the keypad display. Stays that color throughout slew and track. The keypad does not have the 1600 as an option for mount type. I assume you leave it at 1200? Tom

Just thought of something else: What color is the LED on the CP3 servo controller? Rolando

I am simply guessing because there was not enough information. In my mind trailing can mean 1 arc second error in 30 seconds, or 5 minutes. Trailing can also occur when the motor is turned off. In

Rolando, 1. The PEM is off. I attempted a PEMPRO run. The Y axis values appear as expected. The X values within seconds, run off the top of the graph. X values quickly exceed 90. 2. The trailing

The encoders are very precise, so if they are on, the tracking will be exactly sidereal. The PEM is simply a backup in case the encoders are not used for some reason. The mount servo always has this

1) check to see if you have turned PEM to ON 2) Are you getting trailing in both RA and Dec? If so, you may not be properly polar aligned. 3) Do you get trailing nearer to the horizon, or straight

The mount curve is very accurate. No need to update it for many moons. Unless you plan to turn off the encoder corrections, but why do that? Rolando

The answer to that would depend on where the noise is greater and precision is lower: in the PE curve, or the encoders. :-) Generally speaking, it's usually best to refine the hardware calibration,

I have finally gotten the opportunity to install my new AP1600. I am having difficulty getting the tracking accurate. Symptoms: Stars trailed on 30 second exposure. Telescope appears to slew

>> Why would you bother to create a PEM curve? The encoders take care of PE. No need to do anything. The AP documentation (or web site - can't remember which) said a PEM curve is added to each mount