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am i getting the max from my 1.2m cm

iwol

Specialist Contributor
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My Satellite Setup
channel master 1.2m dish
technomate 6900,,and invacom 0.3 quad lnb
satlook micro
My Location
yorkshire
#1
hi could anyone please do some quick calculations for me please to see if i am getting a signal on my full dish face, the lowest incoming angle at my position would be about 21 degrees,the dish faces the obstacle square on at about 7w,ive done some calculations but wondered what anyone else thought, i know the obstacle is 2.8m tall but the bottom of the dish is 65cm making the obstacle 2.15m in theory with a distance of 4.3m from dish to obstacle thanks iwol
 

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Topper

Amo Amas Amant Admin
Staff member
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My Satellite Setup
IDD CI24 ECONO MM Penta 1.20 Galaxy II
1.2Mtr Polar MTG yes it has been on the arc for 25 years and is now fixed on 13 East using two pairs of rusty molegrips. Unlike me they never groan but always perform.
My Location
Blackburn, Lancashire
#2
Do we assume offset dish?, if so what is the focal length?
 

iwol

Specialist Contributor
Messages
688
Likes
11
My Satellite Setup
channel master 1.2m dish
technomate 6900,,and invacom 0.3 quad lnb
satlook micro
My Location
yorkshire
#3
hi topper its a 1.2 channel master off set dont know the focal length
 

rolfw

Believe it when I see it Admin.
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#4
If you draw it to scale and use a protractor, you should be able to measure the angle at the bottom of the dish and compare this to the angle given by the calculator downloadable at www.smw.se
 

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iwol

Specialist Contributor
Messages
688
Likes
11
My Satellite Setup
channel master 1.2m dish
technomate 6900,,and invacom 0.3 quad lnb
satlook micro
My Location
yorkshire
#5
is there a small program to do this for you:)
 

rolfw

Believe it when I see it Admin.
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#6
There is probably an equation for doing it, as it is a right angled triangle and given two side dimensions, you should be able to work out the angle, but I have no idea of how to do it, as it is too many years since I was at School.

All you need is a protractor to work it out, it is a doddle if you have one.
 

Topper

Amo Amas Amant Admin
Staff member
Messages
21,448
Likes
3,209
My Satellite Setup
IDD CI24 ECONO MM Penta 1.20 Galaxy II
1.2Mtr Polar MTG yes it has been on the arc for 25 years and is now fixed on 13 East using two pairs of rusty molegrips. Unlike me they never groan but always perform.
My Location
Blackburn, Lancashire
#7
tan(theta) = sin(theta) / cos(theta) = a / b
 

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Robbo

Super Moderator
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My Satellite Setup
TM6800HD, TM1000, TM600 Linux,TM2200 motor, Channel Master 1.2m motorised, TD110 dish Meter=Satlook Micro+G2 NIT
My Location
Gravesend,Kent,UK
#8
iwol said:
hi could anyone please do some quick calculations for me please to see if i am getting a signal on my full dish face, the lowest incoming angle at my position would be about 21 degrees,the dish faces the obstacle square on at about 7w,ive done some calculations but wondered what anyone else thought, i know the obstacle is 2.8m tall but the bottom of the dish is 65cm making the obstacle 2.15m in theory with a distance of 4.3m from dish to obstacle thanks iwol

Hi The minimum elevation you will be able to see without blocking some of your dish is 26.56 degrees.

--tan (theta)= 215/430. (opposite/adjacent)

therefore, theta = inverse tan (215/430)
= 26.56 degrees

cheers
Robbo
 

Park Royal

Regular Member
Messages
364
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0
My Satellite Setup
Smart lnb, 1m Gibby dish, Stab motor, TM5200D receiver, 57east to 61west. DTT from Sudbury. Virgin Media broadband.
My Location
So called capital of Suffolk, UK.
#9
Dead right "Robbo71, basic trig.
Parky
 

iwol

Specialist Contributor
Messages
688
Likes
11
My Satellite Setup
channel master 1.2m dish
technomate 6900,,and invacom 0.3 quad lnb
satlook micro
My Location
yorkshire
#10
thank you guys:)
 

iwol

Specialist Contributor
Messages
688
Likes
11
My Satellite Setup
channel master 1.2m dish
technomate 6900,,and invacom 0.3 quad lnb
satlook micro
My Location
yorkshire
#11
just managed to find the perfect progam to do this its at _www.satlex.net/en/elobst_calc.html hope it helps anyone
 

Robbo

Super Moderator
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6,424
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My Satellite Setup
TM6800HD, TM1000, TM600 Linux,TM2200 motor, Channel Master 1.2m motorised, TD110 dish Meter=Satlook Micro+G2 NIT
My Location
Gravesend,Kent,UK
#12
iwol said:
just managed to find the perfect progam to do this its at _www.satlex.net/en/elobst_calc.html hope it helps anyone
Other useful information on that site too. Thanks iwol.
 

rolfw

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#13
Here's another one, with a lot more calculators for everything satellite _http://www.satellite-calculations.com/