Lot of dialogue in this thread about LOS definitions, not-detailed enough on-topic discussion for novices.
Assume if the sub is asking... then they are not familiar with basic tools (dishpointer) and terminology.
To give the poster a more practical set of instructions, which do not require any special tools (satfinder instruments or apps)...
You will (might) need a compass, a level, a laser pointer pen, cardboard, and tape.
First of all, DO Go to the dishpointer site and enter in your address.
I see that you're in MA, so generally speaking the RANGE of the direction of the sats 99° and 119°, are roughly the SE and NW corners, respectively of Georgia from MA projected onto a 2D map. (I know, not much fidelity, which is why you need to enter your address).
Depending upon whether your locals, or if you subscribe to Spanish-language channels, etc., you likely do not need to acquire the 110° and 119° sats, so you would have a 3LNB (99° 101° 103°) rather than 5LNB feed. If you do need a 5LNB, then also factor in the 110° and 119° sats.
From MA (atlantic coast) rather than (pacific coast), the sats arc downward (elevation) from left to right (99° to 119°) looking from the dish to the sky, where the opposite is true from the pacific coast.
In the dishpointer application, you will get an AZimuth, ELevation, SKew, and the obstruction trigonometric "legs", example: at a distance of 100', the obstruction "must be less than" 70', etc.
There is an option to select a 3 or 5 LNB multi-sat direction.
The results default to the nominal (101°) for alignment. (for the 3LNB this is sufficient).
For the 5LNB, get the numbers for EACH of the individual sats, so that you can locate each one.
By entering your exact address on the dishpointer site, you'll be able to take advantage of the LOS mapping, providing a visual line superimposed on your site imagery, where you can reference existing landmarks... example: from the SW corner eave of the house, the 99° sat is located in the direction 10' W of driveway/road intersection (much easier than using a compass).
You can then physically walk off the distance from the dish (100' from the example) and ensure that the tree top is less than 70'... or possibly in your case, that the canopy is higher than 70' AND that the tree trunk(s) are not in the LOS.
The materials I mentioned... tape the laser pointing pen to the cardboard with a reference line or edge of the bottom to align to the level based upon the ELevation.
You will then be able to walk your site, and check the LOS from any point.
The ROM numbers for MA are approximately:
SAT AZ(True) ELev OBst(@100')
99° 218° 34° 67'
101° 220° 33° 65'
103° 222° 32° 63'
119° 238° 22° 41' (notice the relatively large delta's)
The tolerances on the home-made sat finder, is such that for a 3LNB, it will suffice to locate the 101° sat, since the 99° and 103° sats are offset only 2° AZ and 1° EL.
Because the 110° and 119° are spaced relatively far apart from the 3LNB sats, you should verify these in addition to the 101° sat.
Note: Usually a workable location for a dish in your situation, is to pole-mount on the N side of (and away from) the house and aim over the house (and hopefully the trees).EDIT:
This post can be referenced to help explain what you're looking at, but skip the field instructions and download the app damondlt
references in his post (3rd post after this one).
Damondlt: The "once per year" that I look at the sky never warranted me spending $20 for an app, but I immediately installed and tried out the free one you posted, Thanks...
Edited by Michael Hilley, 20 March 2013 - 07:38 AM.