[Moon] Is it possible to use Absolute and Incremental Encoderstracking moon with an antenna.

[w2drz]

Hi Anders,

As I read your installation you are doing simple pulse count.

The H3 is a 2-channel quadrature, TTL squarewave outputs,
Using the quadrature encode and controller decode mode allows for
automatic position correction,
this is how the controller of mine is used.

http://www.w2drz.ramcoinc.com/ControllerDoc.htm

The encoder will correct the count + and - as it moves in the free mode
of following the
antenna movement and this will always be the correct antenna position.

Using the H3 - 2,000 count encoder can also on the controller to be a
 8,000 pulse count or 2,000 pulse count depending on a jumper selection
on the controller.

If the encoder has the 3rd, (I) index channel then when the new software
package is released,
still in development at this time,
 that will provide for automatic position correction after calibration
is complete.

Also with the controller, the count is calibrated in the DrzCom program
and 
this allows for any count,
 (do not care what the encoder count is),
 to be used after calibration is complete.

Down load the DrzCom version 1.05 and see how it works,
the program requires the controller to be connected to access all the
controller features.

http://www.w2drz.ramcoinc.com/download.htm
use the " Download via http " to select the file to download.

The controller allows for (5) different tracking software programs to be
used,

for EME the VK3UM and F1EHN software tracking programs are the common
ones used.


Thank You,

Tom W2DRZ

> "Anders, LA8LF" wrote:
> 
> Hello,
> 
> Untill now I have used my own constructed pulse encoders on the AZ and
> EL motor shafts to create pulses for my modem. Yesterday I installed
> US Digital type H3-2000HS  inclinometer encoders that gives 2000
> pulses/360 deg. rotation, i.e. 5.55555 pulses/deg movement.
> Between AZ motor and 90 mm. AZ mast tube there is approx. 1 deg. free
> run (backlash). No backlash between the 130 Kg. commercial 3 phase
> 230V driven EL-screw but the 700 Kg. 4.65M solid dish moves slightle
> even with slightest wind. Any movement of the
> dish greater than 0.2 deg. adds false counts in the tracking mode,
> both AZ and EL due to movement of AZ free move (backlash)  and slight
> wiggleing of the dish in EL.  The EL encoder uses a 0.2 Kg.
> counterweight always in vertival pos.I have seen pictures of numerous
> installed encoders the same way as mine, but honestly do not
> understand how these installations can cope with the slightest wind!
> And we will have increasing wind in numbers and force in the coming
> years. I could go back to using my own made encoder mounted on the
> shaft
> coming out on the back of my 3 phase 230V AC motor, but this is more
> difficult to do on the EL motor as it takes 45 minutes to travel from
> 15 to 55 deg. EL. That is a tremendous number of motor rotations and a
> reduction gear of some 300:1 needed to be mounted at the motor shaft
> coming out at the back end of the motor.
> 
> Does anyone have a working solution for using commercial encoders like
> mine mounted on the  AZ mast tube (those who faces a small backlash in
> their motor/gear system) and non-motor mounted EL encoders?
> 
> 73 de
> Anders
> 
> Anders at LA8LF.com
> www.la8lf.com
> 
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