[RadioTelescope] Stepping rates

Harry McNally harrymc at decisions-and-designs.com.au
Mon Oct 11 18:20:03 WST 2010


Hi again

Andrew Williams wrote:
> On 11/10/2010 1:34 PM, Harry McNally wrote:

> A better way would be to allow, say, 540 (or more) degrees of travel. If
> you slew to a new object, you calculate the direction to 'unwind' to the
> most central cable-wrap azimuth, but if tracking, you could continue in
> one direction for much longer.

Why don't we digitise in both directions and use a wireless link to the dish
electronics ? All we need then is a slip ring for the mains supply on the
azimuth and we can ignore azimuth limits.

See: http://www.eslipring.com/en/index.aspx

I'm presently pondering an arduino I have here as a lash up for stepper clocks
and directions with some serial strings to define ramp up and down and total
steps for each axis, a preload of the next move and a "go" command that allows
the two movements to happen in sync. It won't need to worry about axis limits
initially but could be used to work out the motion limits of the dish.

All the best
Harry




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