150cm dish 'support arms'

Measure the dish, if its 1.65 m from top to bottom and 1.5m across, then the focus length (lnb to dish) is usually 900mm.

Provide a temporary setup as above, then measure for the side arms, its a bit of hit and miss but you will get there eventually.

btw;
Astra 2E has a very narrow footprint, which only covers the UK , Ireland, northern France and west Belgium.

Alas,reception outside of the above drops off rapidly.

you should look at the satellite footprint diagrams on the internet, you'll see the signal range and the direction its being pointed at. Google satellite astra 2e footprint and click images.

I just google'd "Gibertini 155cm", plus the concave nature of the dish would also determine the position, cos the lnb would need to be at the prime focal length, bang got it, here's a link to determining prime focal length of an lnb:

http://www.satsig.net/focal-length-parabolic-dish.htm

smasher2 said:

...I can't find any info' anywhere on the net...

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I don't want to discourage you,but such support arm for offset antennas are not found on the net.And I do not know if it can be made manually,because the focal length of the arm for offset dish and angle of the arm relative to the reflector it calculates by manufacturer.Eventually you can make an arm,but for an accurate reception,especially for weak signals,you need a professional skillfully.I want you to succeed :thum:

maybe smw dish antenna?
ODU OA 1400?

Yesterday I had a hangover and I went by thread title (offset dish) which led me to the wrong conclusion, measurement wise.

Previous posters, rick412 and satesco have made some very valid contributions and if you are determined to press on, as I would (never give up easily) we shall proceed.

Your measurements of 154.5 cms x 154.5 cms is including the curved part flat across, I am assuming, whereas the parabolic area is 150 cm exactly, is this correct?

The focal point of a standard 1.5 m prime focus dish is usually 570mm.

Bearing this in mind and in order to determine different manufactures dish production characteristics, there is a last precise measurement you will need to make as follows;

To determine the exact focal point of your 1.5 m dish, you would need a piece of fishing line cut to exactly 1.5 m, then with the aid of an assistant, hold the line across and just touching the dish without any slackness, these touching points should be just inside (not above) the curved part of the dish.

Measure from centre of dish to fishing line and either calculate yourself or post the result here and I will calculate the focal point for you, either way, post your measurements including focal point you have achived here.

Once you have this exact focal point, only then can you measure for side arm lengths, which will be relatively easy to achive.

Maybe worth asking here http://www.satellitesuperstore.com/cat.htm

You got it in one, well done.

Always where possible use original holes, keeping with dish design and just maintain centre focal point measurement, it should be OK.

Best of luck.

2smasher2:
If your antenna is prime-focus (and seems that it really is) than go to any shop that sells nuts&bolts and buy 3 threaded metal 1m long bars. So you will get LNB holder adjustable. I have 1,5m PFA and mounted several LNBs on it exactly as described above.
https://www.dropbox.com/s/eg8ackyn9o1d2wh/P1240412 (Large).JPG?dl=0
https://www.dropbox.com/s/lw1rohf8hjqfvbj/P1250456 (Large).JPG?dl=0

Lmkiu said:

.....Astra 2E has a very narrow footprint, which only covers the UK , Ireland, northern France and west Belgium.

Alas,reception outside of the above drops off rapidly.

Click to expand...

El Astra 2E y Astra 2F tienen una huella mucho mas abierta de lo que refleja la huella del satelite realmente, en Madrid con 150cm offset y cerca de Valencia con 180cm Foco Primario muy bien (38.5N, 0.5W).

Es un dato importante y estos 2 satelites no dicen toda la verdad al indicar niveles de señal fuera de UK.
Incluso en Madrid con 100cm se sintonizan perfectamente, pero no es normal, seguramente al estar en el punto de maxima señal.
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The Astra 2E and Astra 2F have a much more open than it reflects the footprint of the satellite footprint really, 150cm offset in Madrid and Valencia near 180cm Prime Focus fine (38.5N, 0.5W).

It is an important thing and these two satellites do not tell the whole truth to indicate signal levels outside the UK.

Even in Madrid 100cm perfectly tuned, but not normal, likely to be at the point of maximum signal.



PD: Sorry translations.:thum:
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smasher2 said:

Thanks so much, you've been a real help!

Fingers crossed now!

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You are welcome and again, the very best of luck.:thum:

btw;
I have only just remembered our chats back in June, triggered by Tururu' s post.
I have included the link as a reminder of the bad changes in the pipeline.


@RimaNTSS
Thats a very goood idea, pleanty of strength with very little interference to reception.:thum:

Tururu said:

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The Astra 2E and Astra 2F have a much more open than it reflects the footprint of the satellite footprint really, 150cm offset in Madrid and Valencia near 180cm Prime Focus fine (38.5N, 0.5W).

It is an important thing and these two satellites do not tell the whole truth to indicate signal levels outside the UK.

Even in Madrid 100cm perfectly tuned, but not normal, likely to be at the point of maximum signal.
PD: Sorry translations.:thum:
.

Click to expand...

Translation is perfect.:thum:

Alas, unfortunately, it would seem, the reception of Astra 2E changes in September, see below;

http://www.sat-universe.com/showthread.php?p=1144921#post1144921



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