Advice Needed Laminas 1.8m project with 3 motor

[dreambox1959]

no it s only for those who have a corotor or something like that .

 

[Channel Hopper]

I do not know exactly, but if you install the actuator along the A-B line, then it will move the elevation of the dish very little.

If the levers are crossed over with a pivot point close to the polarmout it will put the actuator into compression mode, which I have always found to provide better position accuracy.

In fact, I also want minimal movement, as precisely as possible. The arm itself will go a little lower, so I have the possibility of movement in both directions. That is, a movement of a couple of degrees. I don't mean to move the crosshair half a meter vertically

You could, if the energy required is minimised with better leverage, use a DiSEqc worm actuator, removing the need for linear electrics/commands.

 

[Beli1910]

Do you have this system for sale? I'm afraid that this is not feasible on the prototype that was made.

 

[a33]

I do not know exactly, but if you install the actuator along the A-B line, then it will move the elevation of the dish very little.

@Beli1910 :
Remember it is not primarily the length of AB in the drawing of @RimaNTSS that determines the stroke-length per degree, but the distances between A and the pivot, and B and the pivot (assuming in your design those two distances are taken about equal). These distances of the 'legs' taken as a straight line.

Greetz,
A33

 

[dreambox1959]

Beli1910
I will explain to you the operation of the positioner as I plan: it must be able to work even without Diseqc commands with the keyboard and the remote control.
-you choose the satellite number (by remote control or diseqc command).
-the data stored in the posi are used to create a USALS type command for your AZ motor, a classic servo for the elevation cylinder, the production of polarotor pulses according to the 14/18v voltage coming from the receiver.
-The LNB number makes another usals type command for the LNB Changer.
in this system the settings in the receiver must be of the classic type (not USALS) sat number, LNB input number etc.

 

[dreambox1959]

i have build your positionner today
i have to add the third motor (diseqc motor for AZ) .

 

[Beli1910]

Looks good. Can't wait for it to be finished so I can try it out. Thanks

 

[dreambox1959]

after a week of intensive work, I have a firmware version that meets BELI1910's request!
the structure has remained the same but I have added a second diseqc engine type output. the control is of the USALS type (therefore limited to +/-80°), the precision is 0.1° (-79.9 to +79.9).
the consumption of these engines is low they can run at the same time.
the elevation command remained standard (for actuator).
the receiver remains in diseqc 1.2 mode and sends the sat number from 0 to 240, this number points to the memory of the positioner to recover the calculated and modifiable position, it is sent to the diseqc AZ motor.
BELI1910 will tell us if the precision will be sufficient!

 

[Beli1910]

Excellent. So the project of this positioner is coming to an end. It remains to be tried in practice. Thank you for your effort - let me know when the final version is finished so that we can cover the costs.

 

[dreambox1959]

how is the construction of the mount? I designed the program for unmodified diseqc engines (divider board) but it will be easy to do it afterwards! it is absolutely necessary that these engines accept USALS commands, but I have not seen examples which refused in the models which are all clones!.

 

[Beli1910]

All my engines receive Usals commands. I didn't quite understand the bracket. It doesn't change anything, because it is mounted like classic Diqec engines.

 

[a33]

it is absolutely necessary that these engines accept USALS commands, but I have not seen examples which refused

Well, of course there seem to be two different USALS/GotoX type commands.
See USALS/ GotoX; Raw diseqc commands

I think it is strange that two different command types are used, but we cannot change that...

Greetz,
A33.

 

[Beli1910]

According to my thinking, the go to X function is a command that sends the motor to the last stored position for that satellite, regardless of whether it is stored via the Diqec 1.2 protocol and manual positioning. The same thing happens if you manually move the motor and select the USALS option by pressing the go to x function turns the motor to the memorized position - in this example on usals. It is possible that these commands are recorded differently, but the principle of operation is identical.

 

[a33]

According to my thinking, .....

I'm afraid that is not what the GotoX command is about.
The GotoX command is just: goto angular position X degrees left or right from center (zero).
The amount of X degrees is often calculated in the receiver with a program that is called USALS (nothing is stored).
Or, of course, you can calculate it yourself; and convert it in a raw diseqc command.

Greetz,
A33

 

[Beli1910]

Here, if you are looking for a satellite - for example, you manually move the engine in a certain direction - for example, turn the engine to the west - and you want to return to the initial position that is stored under the satellite that you are adjusting - with the go to x option, you return to the same position where is memorized - before that you started turning the engine manually. That's what it's for

 

[Channel Hopper]

Well, of course there seem to be two different USALS/GotoX type commands.
See USALS/ GotoX; Raw diseqc commands

I think it is strange that two different command types are used, but we cannot change that...

Greetz,
A33.

There are three types of DiSEqC actuator, two are horizon to horizon and the third is linear, requiring calculation of angular rotation with the inclusion of a polarmount.

 

[Channel Hopper]

Do you have this system for sale? I'm afraid that this is not feasible on the prototype that was made.

Apologies , was this question directed at me ?

 

[Beli1910]

Apologies , was this question directed at me ?

Yes, I immediately asked you when you recommended me.

 

[Channel Hopper]

As it wasn't a reply I didn't consider it as such.

Yes, I have a couple here, they are new/boxed but require a good leverage to move things (hence my suggestion to extend the arms on your design)

Linear means accurate tracking for motor calculation above/below the Clarke belt regardless of where the centre point is (up to a point).

 

[dreambox1959]

A33 said there is 3 mode for usals command
motor:_______________________to the left (+ no. degrees)____________to the right (+ no. degrees)
STAB and SM3D12____________Ex xx_______________________________Dx xx
SG2100_______________________Ex xx_______________________________0x xx
Geotrack H120 and generic____Fx xx (counting back from FF FF)____0x xx

but i read commands on my SF8008 and diseqc original papers
sf8008_______________________Ex yz_______________________________Fx yz
E or F for East or West
xy is hex value of absolute value for azimut
x upper nibble y lower nibble z value for decimal (ex 2 for 19.2)
USALS is diseqc command gotoXY E0 31 6E Fx yz .

USALS system is a calculation , in my home EUT16°e is at 11.7°E (usals result) but if i need to
set my dish at 11.6 or 11.8 i can do it with my positioner not with receiver in usals mode.
it may not matter for small dish (90cm) but for a laminas (180) it will be important