Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Synchronos drive variable speed

This topic has been archived. This means that you cannot reply to this topic.
5 replies to this topic

#1 John Jarosz

John Jarosz

    Astro Gearhead

  • *****
  • topic starter
  • Posts: 3517
  • Joined: 25 Apr 2004

Posted 19 November 2006 - 04:40 AM

In the 60's and 70's Criterion used to advertise a gizmo to vary the speed of their synchronos drive (electrically). They sold it for $90 or so which seemed cheap compared to the cost of the scope. I assume it's something that varies the electrical frequency. Is there a source for something like this? Or some contemporary equivalent? I've not seen anything like this crop up on the auction sites.

Thanks

John

#2 jrcrilly

jrcrilly

    Refractor wienie no more

  • *****
  • Administrators
  • Posts: 35458
  • Joined: 30 Apr 2003

Posted 19 November 2006 - 05:28 AM

I don't know of any new drive correctors that are currently available but the Meade #43 pops up from time to time as new old stock. This outfit always seems to have some.

#3 John Jarosz

John Jarosz

    Astro Gearhead

  • *****
  • topic starter
  • Posts: 3517
  • Joined: 25 Apr 2004

Posted 19 November 2006 - 09:20 AM

Thanks John,
Is that 12VDC input and 110AC output? I have seen those before but I always thought it was DC output for a DC motor.

There is very little info on old Meade stuff on the web. I'm surprised what I can't find with Google here.

john

#4 Mark Lancaster

Mark Lancaster

    Explorer 1

  • -----
  • Posts: 83
  • Joined: 10 Aug 2005

Posted 19 November 2006 - 11:30 AM

The variable speed drives rectified 120 VAC to 12 VDC, then converted back to 120 VAC with a frequency range typically spanning 50-70 Hertz, or greater. These units also accepted 12 VDC directly for use in the field.

They often show up on Astromart. These three appeared last month:

http://www.astromart...ified_id=459194

http://www.astromart...ified_id=459164

http://www.astromart...ified_id=458307

#5 John Jarosz

John Jarosz

    Astro Gearhead

  • *****
  • topic starter
  • Posts: 3517
  • Joined: 25 Apr 2004

Posted 19 November 2006 - 12:18 PM

Thanks mark, exactly what I was thinking of. Now I know what I'm looking at.

john

#6 tybee

tybee

    Ranger 4

  • *****
  • Posts: 310
  • Joined: 02 May 2006

Posted 19 November 2006 - 06:29 PM

The Meade #43 was a basic drive corrector which ran on 12VDC only. The JMI Mototrack V was about the ultimate which even had provisions for PEC, CCD autoguider input and DEC control. I've owned and used both.


CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics