[g__day (Matthew)]

Guys thanks - in order of questions asked.

I say the Moon - because I used it to determine the size of my frame.

The I see drift normally after alinging through Refer stars on three stars - so the rate I presume should be should be sidereal - not lunar!

The Sidereal rate as I say seems slightly slow.

Balance on RA - drift is evident at all points in the sky equally - no matter East or West of the Meridan, nor high or low in the sky. The mount can image with 22kgs - so 14 isn't going to be stressing it - pretty sure its not a balance thing.

I guide all the time - but I wanted to see the raw tracking errors! The trick is to have as good tracking as possible - to avoid corrections whenever possible = sawtooth. I have to be careful to set pulses low in PHD and set aggressive low as well else it overshoots and see-saws - even if adjustments are only every 3 seconds (to minimise seeing errors).

Houghy - I do Meade DSI -> 80mm Megrez or 130mm MAK, via GPINT and PHD. Yes DSLR can only go about 10 minutes and yes I stack on long shots,

Terry - yes - I've asked there too - rings a bell - I am supplying plenty of current via a regulated power suplly - via a UPS (which line filters) - from mains.

PS

Now I've gone Losmandy bars and loaded the mount right up - still purrs! With 3 scopes the set-up looks like: