Gibertini polarmount settings

[satsid]

With circular polarisation, it makes no difference but with linear, the 0 degree line should be pointing downwards. On mine, this makes the heatsink appear at a 45 degree angle.

cool, i'll follow that logic when I have a play with mine

 

[satsid]

and there are 2 positions that the dielectric plate will slot into, how is it known which position to use please?

 

[samoloko]

Correct polar mount elevation for your location is 38.8º. Declination is 6.7º. If you subtract the declination from the elevation it will give you the elevation of your due south satellite. 38.8 - 6.7 = 32.1º

why you substitute declination angle Instead of adding It - In practice declination angle Is added to polar mount elevation angle _http://arrowe.com/polarmount.html

 

[samoloko]

sorry about confusion In upper post - I wrongly replaced polar mount axis with polar mount elevation angles

 

[Huevos]

why you substitute declination angle Instead of adding It - In practice declination angle Is added to polar mount elevation angle _http://arrowe.com/polarmount.html

You are getting confusing elevation and polar axis. They are at 90º to each other. Declination is always less than polar elevation. Satellites are over the equator. You are further north. That means you have to point the dish down towards the horizon a little.

 

[samoloko]

Huevos
thank you for reply
two questions If you please
where are you getting from modifyed polar mount settings
when I have apex declination angle for prime focus dish how can I convert It to use with Gilbertiny 150 offset which Is said to have offset angle of 21.3 deg
for example If apex declination angle for prime focus dish Is 57.9 deg do I have to add 21.3 deg

 

[Archive-8]

Huevos
thank you for reply
two questions If you please
where are you getting from modifyed polar mount settings
when I have apex declination angle for prime focus dish how can I convert It to use with Gilbertiny 150 offset which Is said to have offset angle of 21.3 deg
for example If apex declination angle for prime focus dish Is 57.9 deg do I have to add 21.3 deg

I have a gibertini 125, the 32.1° was for 1°W if you have a prime focus dish set it to 32.1° if you have offset dish set it to (gibertini 1.25 offset 21.3) so 32.1-21.3=10.8 dish angle.

 

[Archive-8]

I have a gibertini 125, the 32.1° was for 1°W if you have a prime focus dish set it to 32.1° if you have offset dish set it to (gibertini 1.25 offset 21.3) so 32.1-21.3=10.8 dish angle.

At my location I found that setting the dish face to 11.2° was best.

 

[RimaNTSS]

Chris! You have got 0,4* difference between calculated and real. That simply means LNB is not located in antennas focus , otherwise you would be getting best performance of system when antenna is leaning exactly 10,8*

 

[Archive-8]

Chris! You have got 0,4* difference between calculated and real. That simply means LNB is not located in antennas focus , otherwise you would be getting best performance of system when antenna is leaning exactly 10,8*

I also have a multi lnb rail on the dish, I think this is the cause.

 

[RimaNTSS]

If you are speaking about central LNB than it does not matter how many LNBs are installed additionally

 

[Archive-8]

If you are speaking about central LNB than it does not matter how many LNBs are installed additionally

The lnb I am talking about is the centre one.
View attachment 80583

 

[Archive-8]

 

[Archive-8]

Other sat app



What is the correct elevation for 1° W?

 

[RimaNTSS]

What is the correct elevation for 1° W?

Find your house @ dishpointer.com and look for elevation, that will be something about 32*

 

[Archive-8]

 

[RimaNTSS]

OK, now extract from 31,6* offset angle of your dish and result will be needed leaning of the face of the dish when it is pointed to 0,8*W (with some mistake, as you are using polar-mount ant Thor is not your due-South satellite).

 

[Archive-8]

OK, now extract from 31,6* offset angle of your dish and result will be needed leaning of the face of the dish when it is pointed to 0,8*W (with some mistake, as you are using polar-mount ant Thor is not your due-South satellite).

Ok so the dish face for 1°W is 31.6°-21.3=10.3°

So what say is nearest due south sat then?

 

[RimaNTSS]

In fact, you do not have due-South satellite (unfortunately). But nearest due-South is 0,8*W, you have not big choice.
If you know for sure that your antenna has 21,3* offset angle, than antenna's face should be leaning 10,3*backwards. If you do not have 10,3* leaning that mean LNB not in focus and ..... system is not performing at it's maximum possible.

 

[smithysmudge]

Looking from a bit of guidance from people with more experience setting up a polar mount I’ve read this thread and numerous others and sadly have brain freeze and the more I try and work it out in my head the worse it gets.
I have had a gibertini 1.25 for a few years now on a Diseqc motor but even although ground mounted and relatively sheltered I feel a polar mount and actuator will be a better solution.
I’m looking for the correct angle to set the polar mount too?
Is it my latitude as below or something else?