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NexStar vs. SynScan

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#1 deSitter

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Posted 10 January 2009 - 07:36 PM

(remember the first DoubCap word? I think it was WordStar, the text editor..)

Could someone point to a quick comparo between these hand controllers?

Why doesn't the Atlas have permanent PEC?

How do they compare to the Autostar 497?

thanks in advance

-drl

#2 Patrick

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Posted 10 January 2009 - 08:25 PM

NexStar is a more mature product with a reliable and solid interface.

Patrick

#3 celestial_search

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Posted 10 January 2009 - 08:29 PM

Atlas/EQ-6 has stepper motors vs. servo.
Synscan HC is now flash-upgradable, but even at its current incarnation it is not at the same evolutionary point as the Celestron.
However, with EQ-mod and laptop the Atlas/EQ-6 is a great mount. You don't need the HC either (I have one that I occasionally use). SynScan is okay, but needs to evolve more. It is functional, but it did take some getting used to after using the Celestron HC.

#4 Steve Fisher

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Posted 10 January 2009 - 08:34 PM

NexStar is a more mature product with a reliable and solid interface.

Patrick


My experience as well.

#5 RogerRZ

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Posted 10 January 2009 - 11:02 PM

I tried EQmod, but found it to have a bit too much of a leaning curve for my liking (for now, anyway). I'm back to the HC. It's been too long since I've had a Nexstar to be able to draw a comparison, bit I seem to recall the Nexstar wad quite a few more features, one of them being a polar align routine...

#6 gordianknot

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Posted 11 January 2009 - 02:11 AM

Atlas/EQ-6 has stepper motors vs. servo


I don't think that matters in the least. SynScan and NexStar hand controllers speak a relatively high level protocol with the mount's motor controller which is what actually runs the motors. These commands are of the form "slew to this position", "rotate the Az axis at speed X", etc. I looked at them a while ago and concluded that the protocols were very similar, if not the same.

#7 Charlie Hein

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Posted 11 January 2009 - 08:48 AM

In fact you can run a SynScan controller through ASCOM using the Nexstar5 or Nexstar8 drivers. They are not at all similar in their software and I do not think for a moment that the hand controllers themselves are interchangeable in any way, but the language used to speak to them is close enough to be compatible.

SynScan software certainly has a long way to go to get the level that the NexStar software (or the Meade 497 for that matter) is at right now. That said, they have only been working on it for a relatively short amount of time, and in that time they have done a remarkable job with the product (IMO). It is a completely usable product.

#8 Robert Babb

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Posted 11 January 2009 - 08:53 AM

I have just purchased a "NEQ6" have had cloudy skys ever since!!
Wondering though what is "EQmod" I see this term referred to in the mounts section?

Robert Babb

#9 Charlie Hein

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Posted 11 January 2009 - 08:55 AM

I have just purchased a "NEQ6" have had cloudy skys ever since!!
Wondering though what is "EQmod" I see this term referred to in the mounts section?

Robert Babb


Welcome to CN! Best way to answer your question is to refer you to the EQMOD site:

http://eq-mod.sourceforge.net/

Have a read over at this site and you should be set.

Charlie

#10 Robert Babb

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Posted 11 January 2009 - 09:19 AM

Thank you so much, I will educate myself and no doubt make further comments.

RB

#11 celestial_search

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Posted 11 January 2009 - 12:52 PM

Atlas/EQ-6 has stepper motors vs. servo


I don't think that matters in the least. SynScan and NexStar hand controllers speak a relatively high level protocol with the mount's motor controller which is what actually runs the motors. These commands are of the form "slew to this position", "rotate the Az axis at speed X", etc. I looked at them a while ago and concluded that the protocols were very similar, if not the same.


All I stated was a fact differentiating the two mounts. Nothing else implied or stated. Doesn't matter if it doesn't matter--a fact is a fact and the poster may want to know that fact.

How is that for "cutting the Gordion knot?" ;)

#12 deSitter

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Posted 13 January 2009 - 01:25 AM

c_search,

Well as you said servos vs. steppers matters a great deal. A stepper is just dumb motor shaft rev counting and has no feedback from the mount. A servo system actually knows the physical orientation of the drive shaft through the encoders. Thus a servo system can do sophisticated error and rate correction on the fly.

-drl

#13 ccs_hello

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Posted 13 January 2009 - 07:59 AM

DRL,

RE: DC perm-mag servo motor vs. micro-stepping stepping motor

It's all in the details:
see this CN post.

DC perm-mag motor requires high gear-down ratio, e.g., for LXD75, it's 7611:1 speed reduction. This is the reason during fastest speed slewing, the "coffe grinder" noise is heard. On the other hand, for SynScan EQ-G, it's 705:1 gear-down.

Clear Skies!

ccs_hello






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