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I still cannot get PEMPRO to work with my mount, but I wrote my own PEC programming software :)

PEMPro works well on other Gemini equipped mounts if you follow the directions. You seemed pretty stubborn about me being wrong about the move distances being different between East/West, so maybe you didn't follow the directions?

You state "the Gemini firmware is using the current guide rate instead of the rates defined by the divisors".
However, as I described in my previous post, this is not my observation. I can change the guide rate to any
value, it does not change PEC behavior.

You should get some correction when the rates are different, but not the best possible correction. The more severe effect is the extra drift introduced, which can cause poorer autoguiding RMS than if you turned PEC off.

The first time I noticed this is when I forgot to match the guide rate to
the currPEC rate and collected residual PE data. The residual PE with PEC ON was well corrected regardless
of the guide rate.

According to your PDF when you had mismatched guide and PEC rates you observed drift (mount would indicate "slew"). I've definitely seen logs where there has been extra drift when the rates do not match. I don't have a mount myself to test with but others can try this test. There is always the possibility that there has been a firmware change to account for this.

Have you tried measuring drift with mismatched guide/pec rates?

-Ray Gralak
Author of APCC (Astro-Physics Command Center):
Author of PEMPro V3:
Author of Astro-Physics V2 ASCOM Driver:

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Cyclone
Sent: Tuesday, August 18, 2020 7:27 AM
To: [email protected]
Subject: Re: [Losmandy_users_io] Valid Guide Rates for PEC on Gemini Level 4

Ray,
I still cannot get PEMPRO to work with my mount, but I wrote my own PEC programming software :)

You state "the Gemini firmware is using the current guide rate instead of the rates defined by the divisors".
However, as I described in my previous post, this is not my observation. I can change the guide rate to any
value, it does not change PEC behavior. The first time I noticed this is when I forgot to match the guide rate to
the currPEC rate and collected residual PE data. The residual PE with PEC ON was well corrected regardless
of the guide rate.

Do you have data that shows that the guide rate affects PEC? That behaviour does not match my mount.

Eric