Compass for sat dishes

A

Archive-8

Guest
Hi I am trying to find some sort of compass app/ digital compass that can used without a satellite dish affecting it.
 

timo_w2s

Retired Mod
Joined
Sep 28, 2005
Messages
4,359
Reaction score
2,883
Points
113
Website
www.timo.me.uk
My Satellite Setup
See Signature
My Location
Maidenhead, UK & Helsinki, Finland
I can't see how it could be possible if using magnetic fields, they are always going to be distorted somewhat by metal objects like dishes.
 

smoggy07

Specialist Contributor
Joined
Aug 20, 2008
Messages
945
Reaction score
384
Points
63
Age
37
My Satellite Setup
Sky minidish and Sky + HD 250gig Anytime+ box with full ish appart from sports and movies, Dreambox DM500s clone (Pli Jade3 max var F/W), Motorised 1.1Meter Dish
My Location
middlesbrough, teesside, northeast coast, uk
I tried the compass app on my iPhone the other week and it worked quite well until I went anywhere near the dish (which I found odd because I thought the compass app used GPS)
 

timo_w2s

Retired Mod
Joined
Sep 28, 2005
Messages
4,359
Reaction score
2,883
Points
113
Website
www.timo.me.uk
My Satellite Setup
See Signature
My Location
Maidenhead, UK & Helsinki, Finland
Some phones have built in compasses. GPS isn't much use for direction finding unless you are moving, and even then it can't show the direction your phone is pointing in, just the direction you are travelling in.
 

Captain Jack

Модератор
Staff member
Joined
Oct 21, 2006
Messages
11,216
Reaction score
7,464
Points
113
My Satellite Setup
See signature
My Location
North Somerset
What you need instead is a dish that won't affect the compass. Like a fibreglass one.
 

timo_w2s

Retired Mod
Joined
Sep 28, 2005
Messages
4,359
Reaction score
2,883
Points
113
Website
www.timo.me.uk
My Satellite Setup
See Signature
My Location
Maidenhead, UK & Helsinki, Finland
But doesn't that still have a metal base in the fibreglass to reflect the signals? Plus the mount can be a problem too.
 

sonnetpete

Grumpy Old Moderator and quiz inquisitor..
Staff member
Joined
Dec 13, 2008
Messages
8,673
Reaction score
3,309
Points
113
Age
70
Website
wordpress.com
My Satellite Setup
Laminas 1.2M fibre dish with an IBU, on a Clarke Tech USALS motor, covering 57E - 24.5W to an Octagon SX88. Displayed on a 20" Dyon LED TV.

Seperate 80 cm dish on 28E with a Humax Freesat for SWMBO.
Free Sat V8 meter. Sony Bravia 46" LCD, Sony BluRay and Home Cinema.
My Location
Normandy, France
There seem to be several for Windows phones/Android/i pads and i phones etc. I guess they use gps and the orientation of your phone somehow. (Not having a smart phone of any kind, I'm a bit hazy about this).

Certainly you can't use a magnetic compass near a dish, even a fibreglass one has a metallic layer I believe. I've never used a compass to set up a dish, relying on a meter of some sort instead.
 

Lazarus

Tout Rond Bon Oeuf
Staff member
Joined
May 29, 2009
Messages
26,410
Reaction score
8,153
Points
113
My Satellite Setup
80cm Motorised.
Several small Dishes.
Much else.
My Location
North York Moors
I've found that compasses give wildly inaccurate results when in close proximity to buildings regardless of whether there is an evident mass of metal present. A fairly pointless exercise, IMHO.

Surely Dishpointer is a far better resource?
 

BlindFaith

Specialist Contributor
Joined
Oct 2, 2011
Messages
639
Reaction score
309
Points
63
Age
40
My Satellite Setup
-
120cm Echostar and 70cm (2nd location)
TBS 5925
My Location
52,0°N, 4,3°E and 52,5°N, 13,4°E
The compass is quite useless but you can use landmarks. The red line points to 19E :)
 

Attachments

  • Screenshot_2014-08-09-10-46-11.png
    Screenshot_2014-08-09-10-46-11.png
    494.8 KB · Views: 60

BlindFaith

Specialist Contributor
Joined
Oct 2, 2011
Messages
639
Reaction score
309
Points
63
Age
40
My Satellite Setup
-
120cm Echostar and 70cm (2nd location)
TBS 5925
My Location
52,0°N, 4,3°E and 52,5°N, 13,4°E
If you don't have a smart phone you can find a landmark with your PC ;)

www.dishpointer.com/


Mod.Note: Live Link enabled - these are now permitted if worthy and relevant
 
Last edited by a moderator:

Captain Jack

Модератор
Staff member
Joined
Oct 21, 2006
Messages
11,216
Reaction score
7,464
Points
113
My Satellite Setup
See signature
My Location
North Somerset
Yes, sorry, forgot about the metal base and the mount. Would aluminium affect the magnetic field?

But, yes, agree with others re dishpointer.
 
A

Archive-8

Guest
I tried the compass app on my iPhone the other week and it worked quite well until I went anywhere near the dish (which I found odd because I thought the compass app used GPS)
That was my point, it's gps based.
 

timo_w2s

Retired Mod
Joined
Sep 28, 2005
Messages
4,359
Reaction score
2,883
Points
113
Website
www.timo.me.uk
My Satellite Setup
See Signature
My Location
Maidenhead, UK & Helsinki, Finland
GPS can only pin point you to a point on earth not tell your phone which way it is looking. You need a compass in the phone to do that.
 

smoggy07

Specialist Contributor
Joined
Aug 20, 2008
Messages
945
Reaction score
384
Points
63
Age
37
My Satellite Setup
Sky minidish and Sky + HD 250gig Anytime+ box with full ish appart from sports and movies, Dreambox DM500s clone (Pli Jade3 max var F/W), Motorised 1.1Meter Dish
My Location
middlesbrough, teesside, northeast coast, uk
I've just found this on one of the crapple sites

They primarily use a magnetometer chip to sense the the earth's field relative to the device. The chip senses the field in three directions, and from that can figure where the magnetic field pointing north is. It can also detect direction of movement with accelerometers and GPS.

Answered by Brodyn W from Perth
  • 23-May-2013
hxxp://store.apple.com/uk/question/answers/iphone/is-the-compass-in-my-iphone-magnetic-or-gps-generated/QFJAXH2FFTU9A9X7X

I never knew that
 
A

archive10

Guest
I've just found this on one of the crapple sites



I never knew that
Smartphones with a compass feature use what is described in your quote (electronic compass on a chip). This is sometimes also found in up-scale digital watches.
Smart-phones also have built-in inclonometers (mechanical, but almost on-a-chip - they come in a package you either surface mount or solder to the edge of the PCB along with the rest of the electronics. This is used for many things, not just to provide a compass, but e.g. to turn display on if phone is moved suddenly (e.g. taken away from ear so the screen can be interacted with). They are also used in device the monitor windows being opened, container doors being opened etc.
These features are what disphpointer-the-app uses to make the augmented reality display shoing where the sats are.
I find you get resonable results, even when holding phone next to metallic dish.
But for correct alignment, I use a dish and a meter, and some patience... ;)
 

Terryl

Specialist Contributor
Joined
Apr 14, 2011
Messages
2,843
Reaction score
1,691
Points
113
Age
79
My Satellite Setup
OpenBox X5 on a 1 meter motorized dish.
And now a 10 foot "C" band dish.

Custom built PC
My Location
Deep in the Boonies in the central Sierra Nevada mountains of California.
Don't stand so close to the dish, about ten feet away would work fine.
 
Top