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I found some information on a old PHD google forum this afternoon which explains a bit about dithering
Random dithering was the first process to be developed and is used extensively but Spiral was developed later to assist with mounts that have DEC backlash issues
The Spiral Dither doesn’t not reverse back on itself like the Random Dither which helps with Dec backlash issues in guiding.The movement starts from the centre (guide star )and moves out and around rather than the zig zag movement of Random
I will try both methods and see how the mount and guiding recovers after a Dither
Thanks
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