Advice Needed 14/18V to 0/5V polariser ?

zorrin

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Do you know if this stuff exists?

From the receiver 14/18V for H/V to 0/5V to polariser

1635718667914.png


To continu to use this

1635719027784.jpeg
 

dreambox1959

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in PM i did not see you want to use an electrical polariser !!!
in fact voltage to apply to this device depends on the frequency !
to get perfect results you have to set differents values from 10.7ghz to 12.7ghz
it s not usable with E2 receiver.
mechanical polariser is a best solution !!
 

zorrin

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in PM i did not see you want to use an electrical polariser !!!
in fact voltage to apply to this device depends on the frequency !
to get perfect results you have to set differents values from 10.7ghz to 12.7ghz
it s not usable with E2 receiver.
mechanical polariser is a best solution !!
Yes you are right my friend. :)
I wondered last night if I remembered how this type of LNB and polarizer works ...
My idea was to find a simple solution to switch from a current universal LNB to an LNB + magnetic polarizer + feedhorn as in the photo.
But it seems I'm mixing things up ...
I will start again from the beginning. if I have for H / V 14/18 on one side, what should I have to do it with a magnetic polarizer?
If I have 22Khz to go from the high band to the low band, what should I have on the Echostar LNB side?
Thank you for your feedback, I am so happy to be able to share with you especially to learn from your experiences. :)
 

dreambox1959

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It depended on the magnetic polar model but in general it was supplied between + 5v and -5v which is the same as 0v to + 10v but the current increases with the voltage! I remember that some models worked between 0 and + 5v on the condition of putting the lnb already at 45 ° In my analog receiver I had set up a mathematical rule to calculate the correct value according to the frequency. But there was a setting per channel so per frequency .
 

zorrin

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and I also believe that for this type of LNB it is 14 / 18V which was used to switch from one band to another.
It's too old for me to remember ...
It's a shame to let them sleep in a box.
 

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Right, it was like that , nowadays pretty much useless indeed with Enigma 2 boxes and other contemporary receivers.

You could however replace the LNB with a "Universal" one (with WR-75 waveguide ... like Invacom SPV-30SM or NJRC NJR2842) and probably still use the magnetic/ferrite polarizer with the help of a polarity controller like ASC1 Titanium, or a home-made contoller like made by colleague Riz-la, or any other based on Arduino. I haven't personally tested the magnetic polarizer however it works perfect with a mechanical polarizer. Maybe dreambox1959 could correct me wrong or tell more...
 

Trust

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That home made controller from Riz-la wont work with magnetic / ferrit polarizers .
Long time ago I made this simple manual "controller"

schema polarizer.jpg
 

zorrin

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That home made controller from Riz-la wont work with magnetic / ferrit polarizers .
Long time ago I made this simple manual "controller"

View attachment 139326
Wow !
This is interesting.
You mean that V = 0V and H = 8V@150mA or vice versa? So if I understand correctly the principles related to the use of the magnetic polarizer + LNB Echostat if they are connected via a converter to a current Enigma tuner:

1635947405310.png
It's correct ?
If yes, it is possible to do that ?
 

dreambox1959

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there have been two models of magnetic polarizer:
those who have a WR75 output (rectangle)
and those who have a round output -output wr75 to mono polarity and dual-band LNB, for example
-round output to universal or orthomode head.
but the principle is to position the whole lnb at 45 ° and to send a direct current in the winding of the polarizer, we test with a current of 0mA at 80mA max (to cause a rotation of the wave of 45 ° in addition) and we reverse the polarity to change the axial plane
So a potentiometer in series with the winding and a double inverter and it works.
but as I said the ideal value varies with the frequency: we do not have the same setting at 10,700 and 12,750 !!

i have pace mss200 schematics where we can see magnetic and mechanical polarizer
 

zorrin

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there have been two models of magnetic polarizer:
those who have a WR75 output (rectangle)
and those who have a round output -output wr75 to mono polarity and dual-band LNB, for example
-round output to universal or orthomode head.
but the principle is to position the whole lnb at 45 ° and to send a direct current in the winding of the polarizer, we test with a current of 0mA at 80mA max (to cause a rotation of the wave of 45 ° in addition) and we reverse the polarity to change the axial plane
So a potentiometer in series with the winding and a double inverter and it works.
but as I said the ideal value varies with the frequency: we do not have the same setting at 10,700 and 12,750 !!

i have pace mss200 schematics where we can see magnetic and mechanical polarizer
@Trust this one is a variable resistor ?

1635962982671.png
@dreambox1959 I'm sure you're right about the frequency problem.
But what would you say to have two values following the high band and the low band ?
Clearly the two values would be the average for each band.
But I imagine something simple and without adjustment with each use.
just a "factory setting" in fact.

For the 45 ° you're also right,
I checked my feedhorn, all in one polarizer reicevd with my Channel Master.
We can see the angle at 45 ° relative to the 0 ° adjustment.

IMG_7276 (Copier).JPG

And this is all my polarizer, all same.

IMG_7277 (Copier).JPG
 

Trust

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@Trust this one is a variable resistor ?

View attachment 139331
@dreambox1959 I'm sure you're right about the frequency problem.
But what would you say to have two values following the high band and the low band ?
Clearly the two values would be the average for each band.
But I imagine something simple and without adjustment with each use.
just a "factory setting" in fact.

For the 45 ° you're also right,
I checked my feedhorn, all in one polarizer reicevd with my Channel Master.
We can see the angle at 45 ° relative to the 0 ° adjustment.

View attachment 139332

And this is all my polarizer, all same.

View attachment 139333
@Trust this one is a variable resistor ? Yes it is .
 

dreambox1959

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here is some pictures of my ferrite polarizer :
one of them is full C120 feed.
1st picture is output 2nd picture is input 3rd picture is what i used a long time ago !!!
 

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