QHY5-II banding

[pmrid]

Anyone come across this? It's a band across the image bottom 20% or so. I can't find a cause and it's giving me the willies. The band is much brighter in a FITS image. For some reason, turning it into a JPG for posting here has subdued it almost to vanishing point. But when in use as an imager, it is almost white.
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Peter

[AlexN]

Is it directly connected to a computer or a usb hub? Possible electrical interference from a powered hub or an unshielded unpowered hub.

I used to get that sometimes using the Qhy5 in ccdsoft when it was set to high priority downloading.

[pmrid]

Hi Alex.
yes. It goes through the same powered hum as the main imaging camera. I wondered about that but dismissed it because a plain old QHY5 (before they got fancy) didn't exhibit that sort of banding.
Peter

[AlexN]

Give it a go on its own lead and seebwhere that gets you. I'm looking at buying a guide camera this week. Let me know if you manage to resolve this. I'm pondering a used Qhy5 vs Qhy5 II or Qhy5L II.

[pmrid]

Just to clarify - this one is the L-II version.
I'll see if I can give it a run on its own lead. I have one of those USB powered leads I might use.


Peter