Author Topic: Limitation with G11  (Read 238 times)

Roger Evans

  • Active Astronomer
  • ***
  • Posts: 117
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Limitation with G11
« on: December 30, 2017, 02:34:00 PM »
When the mount approaches the North South meridian as the scope is facing toward the east...the guide star starts to drift in declination. It starts this at about an hour before it would be reaching the meridian. Becomes more pronounced as the angle to the southern decreases. So, not really an issue when I am imaging cassieopia objects but major issue when I am imaging Orion objects. I have tried shifting weight balance several times back and forth and no change. There is no cord pulling. This doesn't happen when the mount starts from the other side. Is this just a limitation of the Losmandy G11 mount?..would be nice to get that extra hour. My polar alignment is perfect and I have redone phd calibration at this point just to see but no change. My guidescope and guide camera are fixed and stable.



Maurice Deuschle

  • Jr. Astronomer
  • **
  • Posts: 98
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: Limitation with G11
« Reply #1 on: January 01, 2018, 09:57:13 AM »
Have you done a Meridian Flip?

https://www.youtube....h?v=3AdODjqwTV4

Nong Inthisorn

  • Active Astronomer
  • ***
  • Posts: 123
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: Limitation with G11
« Reply #2 on: January 04, 2018, 12:46:30 AM »
Quote
When the mount approaches the North South meridian as the scope is facing toward the east...the guide star starts to drift in declination. It starts this at about an hour before it would be reaching the meridian. Becomes more pronounced as the angle to the southern decreases. So, not really an issue when I am imaging cassieopia objects but major issue when I am imaging Orion objects. I have tried shifting weight balance several times back and forth and no change. There is no cord pulling. This doesn't happen when the mount starts from the other side. Is this just a limitation of the Losmandy G11 mount?..would be nice to get that extra hour. My polar alignment is perfect and I have redone phd calibration at this point just to see but no change. My guidescope and guide camera are fixed and stable.

Never seen this up to 10 degrees past meridian. Leveling?

Regards,

Charlie B

Jason Pederes

  • Active Astronomer
  • ***
  • Posts: 129
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: Limitation with G11
« Reply #3 on: January 08, 2018, 04:47:55 AM »
Quote
Quote

When the mount approaches the North South meridian as the scope is facing toward the east...the guide star starts to drift in declination. It starts this at about an hour before it would be reaching the meridian. Becomes more pronounced as the angle to the southern decreases. So, not really an issue when I am imaging cassieopia objects but major issue when I am imaging Orion objects. I have tried shifting weight balance several times back and forth and no change. There is no cord pulling. This doesn't happen when the mount starts from the other side. Is this just a limitation of the Losmandy G11 mount?..would be nice to get that extra hour. My polar alignment is perfect and I have redone phd calibration at this point just to see but no change. My guidescope and guide camera are fixed and stable.

Never seen this up to 10 degrees past meridian. Leveling?

Regards,

Charlie B
Leveling? No. Balance? Perhaps.

unetankem

  • Active Astronomer
  • ***
  • Posts: 125
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: Limitation with G11
« Reply #4 on: January 11, 2018, 10:56:11 AM »
Quote
What is leveling ?

Seeing the mount is level, this generally not a critical as balance is though but the level should be reasonably close.

Jorge Herbert

  • Active Astronomer
  • ***
  • Posts: 132
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: Limitation with G11
« Reply #5 on: January 12, 2018, 06:12:37 AM »
Quote
Have you done a Meridian Flip?

https://www.youtube....h?v=3AdODjqwTV4

yeah, I have ..but I have to wait about an hour to get the object back in sight

Rodrigo Page

  • Active Astronomer
  • ***
  • Posts: 123
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: Limitation with G11
« Reply #6 on: January 17, 2018, 12:15:03 AM »
Quote
Quote

What is leveling ?

Seeing the mount is level, this generally not a critical as balance is though but the level should be reasonably close.
oh yeah, right.., ...yeah, it's leveled

unoritvie

  • Active Astronomer
  • ***
  • Posts: 120
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: Limitation with G11
« Reply #7 on: January 20, 2018, 09:55:54 PM »
Have you already asked on the Losmandy Yahoo forum? If not, I'd suggest doing so, that is where you will find a much deeper depth of knowledge of Losmandy users.

rioclamabik

  • Active Astronomer
  • ***
  • Posts: 139
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: Limitation with G11
« Reply #8 on: January 21, 2018, 07:44:31 AM »
Quote
Quote

Quote

When the mount approaches the North South meridian as the scope is facing toward the east...the guide star starts to drift in declination. It starts this at about an hour before it would be reaching the meridian. Becomes more pronounced as the angle to the southern decreases. So, not really an issue when I am imaging cassieopia objects but major issue when I am imaging Orion objects. I have tried shifting weight balance several times back and forth and no change. There is no cord pulling. This doesn't happen when the mount starts from the other side. Is this just a limitation of the Losmandy G11 mount?..would be nice to get that extra hour. My polar alignment is perfect and I have redone phd calibration at this point just to see but no change. My guidescope and guide camera are fixed and stable.

Never seen this up to 10 degrees past meridian. Leveling?

Regards,

Charlie B
Leveling? No. Balance? Perhaps.
Another thought! Cable dragging!

Regards,

Charlie B

Coco Moten

  • Active Astronomer
  • ***
  • Posts: 132
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: Limitation with G11
« Reply #9 on: January 25, 2018, 08:58:56 PM »
Quote
Quote

When the mount approaches the North South meridian as the scope is facing toward the east...the guide star starts to drift in declination. It starts this at about an hour before it would be reaching the meridian. Becomes more pronounced as the angle to the southern decreases. So, not really an issue when I am imaging cassieopia objects but major issue when I am imaging Orion objects. I have tried shifting weight balance several times back and forth and no change. There is no cord pulling. This doesn't happen when the mount starts from the other side. Is this just a limitation of the Losmandy G11 mount?..would be nice to get that extra hour. My polar alignment is perfect and I have redone phd calibration at this point just to see but no change. My guidescope and guide camera are fixed and stable.

Never seen this up to 10 degrees past meridian. Leveling?

Regards,

Charlie B
Leveling? No. Balance? Perhaps.[/quote]
Another thought! Cable dragging!

Regards,

Charlie B[/quote]
yeah, i covered that (cord pulling in the OP)..I have had that happen to me before though ...

massgisttesci

  • Active Astronomer
  • ***
  • Posts: 128
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: Limitation with G11
« Reply #10 on: January 26, 2018, 12:43:07 AM »
Quote
Have you already asked on the Losmandy Yahoo forum? If not, I'd suggest doing so, that is where you will find a much deeper depth of knowledge of Losmandy users.

Oh right, duh...thanks!

Robert Estrada

  • Active Astronomer
  • ***
  • Posts: 132
  • Activity:
    0%
  • Reputation: +0/-0
    • View Profile
Re: Limitation with G11
« Reply #11 on: January 30, 2018, 05:34:35 AM »
what is odd about this is that I do polar alignment with the scope/mount near this position ...perhaps my guide scope and guide camera are colluding against me