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Greg
Some detail on PHD2 Predictive PEC guiding -
Advanced Functions for PHD2 - Predictive PEC ( Periodic Error Correction) in PHD2
PPEC is an alternative to the Hysteresis algorithm normally used for your mounts RA guide corrections and can provide improvements to your mounts overall guiding
Go to Brain
Select Algorithms
In ‘Right Ascension’ select “Predictive PEC”
Use all default settings for Predictive Weight, Reactive Weight and Min Move ( Period Length can be adjusted to suit your mounts worm cycle period but always leave “Auto Adjust Period” checked or ticked )
Do your normal Calibration then start guiding
PPEC takes time to train itself and perform
It starts out using the normal RA Hysteresis algorithm then shifts seamlessly to the PPEC algorithm after about 2 worm cycles of the mount when it learns the mounts performance
HEQ5 mount worm cycle period is 638 sec or 10 minutes 38 seconds
EQ6-R mount worm cycle period is about 480 sec or 8 minutes
PPEC will remain whilst guiding , stopping and starting guiding for focusing and dithering on the same target
If you stop and slew to a new target , PPEC must be turned off and then on again , start guiding and then re train itself again on the new target
Once training is complete after 2 worm cycles, the PPEC algorithm uses both reactive and predictive guide corrections which in principle is usually more accurate than just Hysteresis on its own
EQMOD has a feature to store your mounts PEC curve which is created by a third part software like PECprep and allows PHD2 to retain and use this data when running the PPEC algorithm. This saves PHD2 time when setting up and guiding for the next imaging session
The mounts Synscan handcontroller also has a function to record PEC and store it in the mount for PHD2 to use along side the PPEC function
Cheers
Martin
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