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Multi - satellite reception.
Why have your dish aimed at just one satellite? With a bit of home bodging and experimentation, you can get reception of more than 1 satellite from one dish.
Mount a dish in the garden on an adjustable base.
The easiest way is to do what I do, and sit your dish on an old car tyre in the garden. (I used bricks originally, but they knocked too much paint off the dish - causing it to rust). Then you can just swing the dish round to whatever satellite you want to watch. This has distinct disadvantages during bad weather - believe me its no fun re-aligning the dish in heavy rain or snow!
If you try this you must make sure the dish can't blow over every time a gust of winds blows across the garden. I use a couple of wood laths jammed up against the back of the dish and always lay the dish flat on the ground if high winds are forecast.
More than 1 dish
Point 2 dishes at 2 seperate satellites. If you mount the dishes as shown in the picture below, you will likely be in breach of planning regulations in the UK, since normally you are only allowed 1 dish. However as long as one of the dishes is not permanently mounted, you may be ok. (This is not a definitive statement of UK planning law!) Read this: "A Householder's Planning Guide for the Installation of Satellite Television Dishes" which has much more information about this area.
More than 1 lnb on a single dish.
You can use more than 1 lnb on the dish. Until recently, 3 lnb's was the most I had seen on one dish, but here is a dish with 4 !
This picture is taken with permission from the website of Gerd Schweizer in Germany, and was provided by Hauke Peinz.
The 4 lnb's, can receive Astra 28.2E / Astra 19.2E / Hotbird 13E / Sirius 5E !!
And here is a dish with 5 lnb's!
I have got a picture of a dish with 9 lnb's on it, but that is getting a bit extreme! Unfortunately it's not suitable for reproduction on the site.
Of course you would need a lnb switch box by your receiver if you decided to try these multiple lnb's. Or possibly have more than 1 receiver, with each lnb feeding a seperate box. This system works because as long as you use a big enough dish, you can get away with having lnb's off the main reception axis. The dish has its prime focus pointing at the weakest satellite cluster - probably Hotbird 13E in most of Europe. The other satellites are powerful enough to provide sufficient signal even though they are not being received at the prime focal point.
A simpler way of doing this is to fit a monoblock lnb. These are single lnb's that have two seperate receive heads within the casing. Most of them are set for a 6 degree seperation, so would receive Astra 19E and Hotbird 13E no problem. These have the advantage that most of them only require 1 coax cable, with the switching between the heads being done electronically by the receiver. This only works if the receiver has the facility for auto switching of course - not all of them have.
Motorise your dish.
Not a particularly cheap option, and definitely not for beginners to install. The dish has to track left-right, and also up-down to follow the orbital arc. The sorts of adjustments needed to get a dish like this working properly really need an experienced touch. If you are interested in this, get the services of a specialised satellite dealer to set it up (Not a Sky installer - most of them know how to install the toy Sky dishes and that's about it) . |
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发表于 2007-1-11 00:35
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