positionner

I have between 6 and 7 db of loss.
In addition to the DISEQC commands I also had it switch between 2 receivers.
The losses are identical in the 2 outputs.
I think my problem is the design of the PCB with the F connectors
 
hi rodrigo
i have implemented PWM in my positioner : it s works perfectly with classic actuator (18 or 24 inch arm) but for an smr1224 ( a friend of mine) it s erratic
sometime motor dont run or stop anywhere
when power supply is low motor dont start !!
do you manage mosfet all the time or do you put power on only with mosfet ?
what is frequency rate with mosfet ?
what is the range of your duty factor ?
 
Hi.
The frequency of the PWM with arduino is 490Hz if I remember correctly.
I made the duty configurable because not all actuators are the same.
To change the direction of rotation I use a relay and activate the actuator with a mosfet

the smr1224 has some electronic circuits inside, maybe that's the problem
 
thanks all
in my device pwm frequency is 5khz , i thought it was not enough but if its ok with less 1K i can try it
the smr1224 of my friend is like Trust said : no electronics just like a classic actuator
the problem is : as soon as the motor power is pulsed the reed switch line is also modulated !!
that s why pulses are not counted ! but motor run !!
does the motor doesnt accept PWM ? does motor has a common ground with lnb ground or pulse ground ?
 
Are you generating the PWM with the micro-controller chip or using an external dedicated chip?
 
i m using micro-controller , i think that problem comes from "diaphony"
i cant go upside 5khz (200µs) with this chip (89s52) but if i use dedicated chip like a small pic16 i can reach 20K !!
 
hi rodrigocn
i have seen your videos on FTA-FORO
i have some questions :
does the pmw frequency is 50hz ? (like in video)
what is your concept dish1/dish2 ?
what is diseqc command for step move (10 pulses for example?)
 
thanks all
in my device pwm frequency is 5khz , i thought it was not enough but if its ok with less 1K i can try it
the smr1224 of my friend is like Trust said : no electronics just like a classic actuator
the problem is : as soon as the motor power is pulsed the reed switch line is also modulated !!
that s why pulses are not counted ! but motor run !!
does the motor doesnt accept PWM ? does motor has a common ground with lnb ground or pulse ground ?


problem was fixed : there are buried cables in ground , there are out of order !!! new cables works well !!
 
hi rodrigocn
i have seen your videos on FTA-FORO
i have some questions :
does the pmw frequency is 50hz ? (like in video)
what is your concept dish1/dish2 ?
what is diseqc command for step move (10 pulses for example?)

Hi.
I currently have the pwm frequency at 800Hz.

The value of 50hz that you see in the video is the frequency of the pulses received from the sensor

The idea of dish1 / dish2 is that this positioner can control 2 actuators to position 2 independent antennas

Some receivers implement the option to move X number of pulses
 
Hi.
I currently have the pwm frequency at 800Hz.

The value of 50hz that you see in the video is the frequency of the pulses received from the sensor

thanks for your answer !
i do pwm supply for actuator at about 5khz then cycle is about 200µs and i have conflict with interupt routines so my duty cycle run from 25% to 60% and above i put 100%¨!
i will try to 800hz/1khz (1mS) and see if it s ok !!
do you manage mechanical polariser ?

BR
 
thanks for your answer !
i do pwm supply for actuator at about 5khz then cycle is about 200µs and i have conflict with interupt routines so my duty cycle run from 25% to 60% and above i put 100%¨!
i will try to 800hz/1khz (1mS) and see if it s ok !!
do you manage mechanical polariser ?

BR


I do not use polarizer.
 
hi rodrigo
i have read your latest post on FTAFORO (with google translation) in the last post you are talking about the pwm utility !

i have seen the same problem with my SF8008 (when there is no signal, receiver send diseqc command always and always)

i have filtered command from diseqc : i look if there is change before asking a move to positionner

even if the current position is 1 or 2 near the request position , motors dont run again but with PWM i have a perfect stop !!
 
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hi rodrigo
i have read your latest post on FTAFORO (with google translation) in the last post you are talking about the pwm utility !

i have seen the same problem with my SF8008 (when there is no signal, receiver send diseqc command always and always)

i have filtered command from diseqc : i look if there is change before asking a move to positionner

even if the current position is 1 or 2 near the request position , motors dont run again but with PWM i have a perfect stop !!

Yes,
I prefer to use the PWM, you can make a soft start and soft stop

Also in the case of H-H motors, the magnet is directly coupled to the shaft and the count is very fast.

I have 2 H-H motors with the electronics damaged, I am making another version of the positioner for this type of motors
 
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