HEQ5 Belt mod help

[benklerk]

I just recently got a belt mod conversion for my HEQ5 Pro, the guiding is much smoother then it is. But I was expecting a flatter line.
I don't have much mount experience or using PHD2, but can someone point me in the right direction to get this issue fixed?

The 2 sec graph shows bad RA oscillation while the 1 sec the RA is more smoothed out.

PHD2 has the correct focal length and pixel size.
EQmod pulse guide is at 0.30 same in PHD2.
The mount is balanced using the 90 deg angle method.
I am using a guide scope.

Is it a PHD2/software issue, or is it a mount/motor issue?

Ben

[AndrewJ]

Gday Ben
Can you post the log itself please.
Also, can you try to grab say 2 minutes of unguided data as well, using the highest framerate you can get.
I strongly suspect you have a belt tension problem, and doing an FFT analysis of your unguided data will confirm that.
I had similar with my AZEQ5, but with the right tension, it all comes good.

Andrew