Advice Needed Positioner Mod?

[dafydd]

After my recent Vbox troubles I have been reading up on positioners. (I wish my - Tm5402 M3 had a proper 36V drive and autofocus like my old TM 5500 CIP which is heading for the scrap.)
Now to ask a daft question!!!
With a permanent 36V feed to the dish, would it be possible to fit a USALS drive with it's motor removed and replaced with two relays to direct the 36V to a jack?
This would provide the speed and power of a jack whilst controlling it with USALS from the receiver. If the output shaft of the USALS positioner were coupled to the pivot of the polar mount, it would not need to be a structurally strong item as it would only be used to provide control.
Is this a totally stupid question on my part?
Comments most welcome!

 

[7mdish]

I suspect it is a very difficult job and you cannot be sure of good working until you make proper test.
So, why not thinking to the positioner by dreambox1959? You could control a very common 36v actuator from your TM5402 M3 without any problem.

 

[Channel Hopper]

I suspect it is a very difficult job and you cannot be sure of good working until you make proper test.
So, why not thinking to the positioner by dreambox1959? You could control a very common 36v actuator from your TM5402 M3 without any problem.

Splitter !

Can you tell what it is yet ?

As Rolf Harris would say A couple of hours spare, so why not ?

www.satellites.co.uk

 

[dreambox1959]

first question: what mount and motor do you have??
Trust has adapted the control board from an HtoH rotor with relays and 36v to an SMR1224 type motor.
otherwise if you are able you can assemble a copy of my positioner (several ones are made).

 

[dafydd]

At this stage it is only an academic exercise.
My thought process was that it could use the existing installation - the USALS ability of the receiver, the power feed to the jack (which would become the permanent 36V feed), the polar mount and jack.
A cheap unit could have the motor removed and in it's place two reed relays and two diodes - low power devices which would provide isolation.
In a small box, two 36V relays energised by the three leads from the reed relays, fed from the permanent 36V feed and the output of the relays going to the jack.
If converting from a Vbox, the 36V supply is available with a slight modification.
The most difficult part may be making the brackets to mount the modified drive and coupling it to the axis of the polar mount.

 

[dafydd]

The attached PDF is my thoughts circuit-wise. Are there any obvious snags to this?
If I can find a USALS motor, without spending a lot of money, I can easily build a test bench version of this as I have a small polar mount, a 90cm dish, an 8" jack and a dead vbox to give me the 36V supply.
Any thoughts and comments gratefully received.

 

[ozumo]

Might be useful?

ROTATING SATELLITE DISH SPARES | eBay

<p dir="ltr" style="margin-top:0; margin-bottom:0;">Rotating Sattelite Dish Spares </p> <p dir="ltr" style="margin-top:0; margin-bottom:0;">2 Super Jack dish mounts</p> <p dir="ltr" style="margin-top:0; margin-bottom:0;">Satellite Finder</p> <p dir="ltr" style="margin-top:0; margin-bottom:0;">4...

www.ebay.co.uk

edit: never mind don't think that motor is USALS compatible

 

[Trust]

Might be useful?

ROTATING SATELLITE DISH SPARES | eBay

<p dir="ltr" style="margin-top:0; margin-bottom:0;">Rotating Sattelite Dish Spares </p> <p dir="ltr" style="margin-top:0; margin-bottom:0;">2 Super Jack dish mounts</p> <p dir="ltr" style="margin-top:0; margin-bottom:0;">Satellite Finder</p> <p dir="ltr" style="margin-top:0; margin-bottom:0;">4...

www.ebay.co.uk

edit: never mind don't think that motor is USALS compatible

Right ! Usals is only working with a motor system that provide a lineair amount of pulses/degree .
So only H2H rotors are usefull or the pulses must be provided by a encoder at the polarmount axle
Edit : I dont mean that motor at Ebay but the 8” jack .

 

[ozumo]

or the pulses must be provided by a encoder at the polar axle

From dafydd's first post this appears to be the plan, connect the output shaft of the DiSEqC motor to the polar axis to drive the encoder as the actuator moves the dish.

 

[Trust]

From dafydd's first post this appears to be the plan, connect the output shaft of the DiSEqC motor to the polar axis to drive the encoder as the actuator moves the dish.

That wont work because then of the worm gear in the diseqc motor will prevented the movement of the polar axis .

 

[Trust]

Just Sharing This - Jaeger SMR1224 Usals ready

Today did some work to modify my SMR 1224 for the use with Usals . First removed the reedswitch en replaced the magnet wheel for one slot wheel . Put the optical sensor board at the right place , there is plenty of room in there . Set the limit switches to 80º E and 75 W making a 155º turn...

www.satellites.co.uk

here a example how to make Usals working at a 36 V H2H rotor

 

[dafydd]

Do all diseqc motors use a worm gear? I found a manual online for Stab HH100 (in Dutch) where the assembly diagrams seem to indicate that it uses straight gearing.

 

[Trust]

I've seen a lot of different types and brands of diseqc rotors , all of them uses wormgear for the outgoing axle .
Only the gears in the little gearbox attached to the electromotor , are strait .

Also Stab

 

[dafydd]

Thanks for the reply. Here is the picture from the STAB manual that led me to believe that it did not use a worm drive, because all the shaft axes are parallel. The manual may prove useful for anyone who has problems with a STAB as it gives the circuit diagram of the circuit board and a complete component list. It is a 3.6 MB pdf file, so probably to big to upload here.

 

[Trust]

showing the worm

 

[dafydd]

@Trust,
I was not doubting your word - just saying that was the picture which gave me my original idea! So the whole scheme has gone west - I did say in my original post that I was asking a daft question.
However, the document I have discovered may prove useful to others - actually it is in French and a worm gear in the parts list is "vis-sans-fin".

 

[dreambox1959]

if you own some others pages of this datasheet i m very interresting in it .

 

[dafydd]

@dreambox1959,
I have the complete document. It is 34 pages and a pdf file of 3.6 MB.
I am sure you will find much of it irrelevant, but a few pages of greater value. How would you like me to send it you?

 

[Trust]

@dafydd , I'm interested too , can you load it up to a site like WeTransfer ?

 

[a33]

it s been here for a few years:

STAB HH100 onderdeeltje doorgebrand

Mijn STAB motor draaide al een tijdje niet meer. Ik heb 'm vandaag gedemonteerd en opengemaakt, en ontdekt dat er een weerstand of spoeltje helemaal zwartgeblakerd was (vlak naast de twee diodes, en de dikke spoel/trafo). De koperbaan naar boven die eindigt bij het middenste pootje van de BD438 (...

www.sat4all.com