Home position not Dec 90-deg

cpl42

Hi,
I'm still commissioning my ASIAIR and I notice that when I select my 'scope (Sky-Watcher EQ6-R Pro/EQMOD Mount) and the Home option in the application, it shows Home at 89-deg Dec. Sure enough, that's where it parks the 'scope. Why doesn't it show 90-deg Dec and is there a way of changing it from its current 89-deg? It's a nuisance to remember to reset the park position manually, and frankly, 89-deg seems to make absolutely no sense to me. P.

cpl42

Well, this seems to have stumped you all. I will raise it with ZWO tech support. So far, I haven't found it to be a problem with PA. It just niggles that it isn't a true static SCP position, as required by the PA process.

cpl42

I got in touch with ZWO tech support in the USA. To their credit, they responded rather quickly - I'm not used to such enthusiastic support service!!

Here is what they say, verbatum:

"No the offset won't affect PA.

The offset is used to avoid the direct homing sensor position -

There was some talk to fine tuning it out but its merely asthetic and won't mess with operations inc PA

at some point there will be a fine tune but its only for visual purposes"

I'm not sure what the "direct homing sensor position" is/means and why it is an issue - every other GEM I have ever used had no problem homing/parking in the CWD & Dec = 90-deg position. The tech support person, in a later email, indicated that this issue will be addressed in V.2 of the ASiair firmware. However, it is my experience that such statements need to be taken with care, as much can happen between plans now, and actual delivery.

I hope this has been a curious/interesting diversion for you viewers.

Clear skies, Paul.

PMTeam@ZWO

cpl42 Yep, thank you, Paul. Just confirmed: If the mount has GoHome cmd, it will back to DEC 90 degrees while doing Go Home POS, if not, it still uses the GoTo cmd to DEC 89 degrees. Modifies includes in v2.0.