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Equipment Discussions >> Mounts

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FlyBD5
sage
*****

Reged: 02/12/13

Loc: Boston MA
CG-5GT prepurchase
      #5914908 - 06/11/13 11:45 AM

What should I look for when inspecting a used CG-5GT mount that I am interested in purchasing?

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pjensen
super member


Reged: 04/08/12

Loc: Highland Village, Tx
Re: CG-5GT prepurchase new [Re: FlyBD5]
      #5914996 - 06/11/13 12:36 PM

Quote:

What should I look for when inspecting a used CG-5GT mount that I am interested in purchasing?




If it is possible, do a 2 star + 4 alignment and see how good the goto is. Try a couple of double stars - are they in the eyepiece field of view?

This will bring out any problems, if there are any.


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FlyBD5
sage
*****

Reged: 02/12/13

Loc: Boston MA
Re: CG-5GT prepurchase new [Re: pjensen]
      #5915090 - 06/11/13 01:40 PM

Okdok. Thanks!

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frito
Pooh-Bah


Reged: 10/05/12

Loc: Fremont, CA
Re: CG-5GT prepurchase new [Re: FlyBD5]
      #5915109 - 06/11/13 01:50 PM

also flip over the hand control and make sure it has a little phone jack at the bottom. it is a serial interface so you can upgrade the HC and MC firmwares if needed and also control with computers etc. the earliest versions of the mount had non upgradable HC's with no port.

lastly don't be alarmed if it sounds like its dying while slewing! it's simply just singing to you while it moves


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jrcrillyAdministrator
Refractor wienie no more
*****

Reged: 04/30/03

Loc: NE Ohio
Re: CG-5GT prepurchase new [Re: frito]
      #5915123 - 06/11/13 01:58 PM

Quote:

also flip over the hand control and make sure it has a little phone jack at the bottom. it is a serial interface so you can upgrade the HC and MC firmwares if needed and also control with computers etc. the earliest versions of the mount had non upgradable HC's with no port.




Nexstar handboxes have always had that port, even in models long before the CG-5GT came out - but in early versions it was used only for PC control of the mount. The later, upgradable handboxes are much to be preferred over the older, non-upgradable models (some very powerful and desirable features are available only on the later model) but you can't tell them apart by looking at them. If you power the mount up, you can check the installed firmware revision and that will tell the tale but I don't remember what version was first implemented on the upgradable hardware. I can check that unless someone here remembers it.

Edited by jrcrilly (06/11/13 02:04 PM)


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Fred1
Carpal Tunnel
*****

Reged: 09/19/07

Loc: Somewhere in the Orion Spur
Re: CG-5GT prepurchase new [Re: jrcrilly]
      #5915134 - 06/11/13 02:05 PM

Quote:

- but I don't remember what version was first implemented on the upgradable hardware. I can check that unless someone here remembers it.




4.xxx is the upgradeable version. If it says 3.xxx then its isn't upgradeable.


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jrcrillyAdministrator
Refractor wienie no more
*****

Reged: 04/30/03

Loc: NE Ohio
Re: CG-5GT prepurchase new [Re: Fred1]
      #5915143 - 06/11/13 02:13 PM

Quote:


4.xxx is the upgradeable version. If it says 3.xxx then its isn't upgradeable.




Thanks! I've owned both, but not recently.


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frito
Pooh-Bah


Reged: 10/05/12

Loc: Fremont, CA
Re: CG-5GT prepurchase new [Re: jrcrilly]
      #5915145 - 06/11/13 02:15 PM

well there you go, ignore me. i for some reason thought the non-upgradeable ones had no port, not sure where i got that from.

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jrcrillyAdministrator
Refractor wienie no more
*****

Reged: 04/30/03

Loc: NE Ohio
Re: CG-5GT prepurchase new [Re: frito]
      #5915154 - 06/11/13 02:22 PM

Quote:

well there you go, ignore me. i for some reason thought the non-upgradeable ones had no port, not sure where i got that from.




Still, you raised an excellent point. ASPA alone makes the later version far more capable.


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FlyBD5
sage
*****

Reged: 02/12/13

Loc: Boston MA
Re: CG-5GT prepurchase new [Re: jrcrilly]
      #5915172 - 06/11/13 02:33 PM

True, I should still check for the port and the version. I'm looking at two, one is new, still in the box, the other is used, about 18 mos old, all firmware upgraded for HC and MC, -and- proven good results in astrophotography.

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rmollise
Postmaster
*****

Reged: 07/06/07

Re: CG-5GT prepurchase new [Re: frito]
      #5915487 - 06/11/13 05:21 PM

Quote:

also flip over the hand control and make sure it has a little phone jack at the bottom. it is a serial interface so you can upgrade the HC and MC firmwares if needed and also control with computers etc. the earliest versions of the mount had non upgradable HC's with no port.

lastly don't be alarmed if it sounds like its dying while slewing! it's simply just singing to you while it moves




Well..not exactly...since the original non-upgradeable HC also has the serial port on the bottom that allows control with a laptop. The only way to tell is by checking the firmware version (in the HC menus). If it is 4.x, it is upgradeable. 3.x? Uh-uh.


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jrbarnett
Eyepiece Hooligan
*****

Reged: 02/28/06

Loc: Petaluma, CA
Re: CG-5GT prepurchase new [Re: FlyBD5]
      #5915710 - 06/11/13 07:32 PM

How much you paying?

You can get a brand new one on clearance with the latest hardware and firmware for $549.

- Jim


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FlyBD5
sage
*****

Reged: 02/12/13

Loc: Boston MA
Re: CG-5GT prepurchase new [Re: jrbarnett]
      #5915797 - 06/11/13 08:32 PM

Just picked up for $420, new in the box, unused. Firmware is easy to update, it's got the right hand control (NexStar, not NexStar+, makes no difference to me and I can upgrade the hand control later if I want to.) I'm pleased. Thanks, folks! Much obliged for the help!

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FlyBD5
sage
*****

Reged: 02/12/13

Loc: Boston MA
Re: CG-5GT prepurchase new [Re: FlyBD5]
      #5916145 - 06/12/13 12:11 AM



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frito
Pooh-Bah


Reged: 10/05/12

Loc: Fremont, CA
Re: CG-5GT prepurchase new [Re: FlyBD5]
      #5916245 - 06/12/13 01:52 AM

congrats.

i was going to say, at those ages they will be newer versions. i'm the third owner of my CG-5. the non-upgradable firmware ones are not very common and are pretty darn old.


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frito
Pooh-Bah


Reged: 10/05/12

Loc: Fremont, CA
Re: CG-5GT prepurchase new [Re: jrcrilly]
      #5916247 - 06/12/13 01:53 AM

Quote:

Quote:

well there you go, ignore me. i for some reason thought the non-upgradeable ones had no port, not sure where i got that from.




Still, you raised an excellent point. ASPA alone makes the later version far more capable.




yes, i love the ASPA, i'd probably be frustrated as hell trying to image with my CG-5 unguided with no polar scope without it.


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FlyBD5
sage
*****

Reged: 02/12/13

Loc: Boston MA
Re: CG-5GT prepurchase new [Re: frito]
      #5916614 - 06/12/13 09:53 AM

What a difference in the motors and stability. Wow. It's all set and ready to go for a family Father's Day star party.

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munchmeister
sage
*****

Reged: 04/04/12

Loc: Fort Collins, Colorado, USA
Re: CG-5GT prepurchase new [Re: FlyBD5]
      #5916821 - 06/12/13 12:05 PM

PMJI, do any of you guys know how to upgrade an HC so that the All Star alignment procedure is available? TIA.

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RTLR 12
Post Laureate
*****

Reged: 12/04/08

Loc: The Great Pacific NorthWest
Re: CG-5GT prepurchase new [Re: munchmeister]
      #5916830 - 06/12/13 12:08 PM

Here you go...

http://www.celestron.com/c3/support3/index.php?_m=knowledgebase&_a=viewar...,255


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FlyBD5
sage
*****

Reged: 02/12/13

Loc: Boston MA
Re: CG-5GT prepurchase [Re: RTLR 12]
      #5916892 - 06/12/13 12:39 PM

Quote:

Here you go...

http://www.celestron.com/c3/support3/index.php?_m=knowledgebase&_a=viewar...,255




Add to that =patience= as the process takes a bit of time, and make sure the mount is plugged into AC power while you are upgrading the firmware. Failure to complete the update correctly may cause self-inflicted premature hair loss.


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