SatCure LNB fitting instructions
We have been selling LNBs since 1995 and always thought that how to fit them was obvious!
But recently I've had a few people complaining that we didn't provide fitting instructions.
Well, that's fair comment and we specialise in making technical things easy to understand so here goes.
Firstly, if you need an LNB specifically for a Sky (wide, oval) dish, we supply ONLY the MK4 Sky LNB now (see below).
Secondly, if you are replacing an existing LNB, it's good idea to touch the dish as little as possible. If the dish is already aligned correctly, you don't want to move it even a fraction of a degree because the alignment is critical!
So, make a careful note of the position of the LNB. There are often two possible adjustments.
1. Focus - the LNB can be slid back and forth to set its exact distance from the dish.
2. Skew - the LNB can be rotated. Often numbered 1 to 5.
Carefully remove the LNB from the dish arm. For a conventional fitting, the LNB will be held by a "saddle clamp" and two screws. Remove the screws and lift out the LNB.
For a Sky minidish the LNB has a plastic spigot or "finger" which is pushed into the dish arm (except latest MK4 type which fits OVER the arm). To remove the LNB, remove plastic pin and place a piece of wood or thick card against the cap that faces the dish and strike it smartly with a piece of wood or mallet. The LNB spigot should spring out of the hollow dish arm.
Now the old LNB is free from the dish arm, cut off any self-amalgamating tape with a sharp blade or remove the rubber cap that keeps rainwater out of the screw "F" connector. Unscrew the "F" connector. If it is tight you will need an 11 mm spanner.
Check the cable for signs of corrosion. If water has entered it, the cable will be ruined and may cause some channels to give a "blocky" picture (or none at all). The typical life of unprotected cable outdoors is 5 years. You can protect the cable by giving it a good, thick coating of oil-based paint or by routing it through conduit or trunking.
Screw the cable to the new LNB. The modern quad-output LNB has an integral pulldown rain cover, but condensation can still get into the connections, so apply a liberal coating of silicone grease inside each 'F' plug, before tightening, then pull the cover down. If there is no such cover on your new LNB, use a rubber boot or self-amalgamating tape to waterproof the connection so that rainwater can not enter the connection. This is most important since water can quickly run down the inside of the cable and straight into your satellite receiver! If you don't have any self-amalgamating tape or boots, use Blu-Tack temporarily. DO NOT use any other tape such as PVC electrical tape, Sellotape or Duct tape, because it's impossible to make a waterproof seal and such tape will simply trap water inside, making a bad job even worse.
Unused LNB outputs can be protected with a little "Blu-Tack" to keep out moisture. If the LNB comes with plastic caps fitted to the output threads, put a little silicone grease into each cap and push onto unused output connectors.
See "How to fit an 'F' connector" and "Using silicone Grease".
Aligning the dish
If your dish needs realigning then, provided that it is only slightly misaligned and still receiving a signal, you can achieve perfect alignment by using your Sky Digibox.
Connect a portable TV to your Digibox with a cable long enough to reach. Position the portable TV in a window close to the dish or tie it to the ladder (care!) where you can see it. Don't bother to try the "wife looks and shouts instructions" method. It doesn't work!)
Select the Digibox signal menu by pressing [services] 4 6.
Set the dish to give maximum signal.
Set the LNB focal position (if adjustable) to give maximum signal.
Now rotate the LNB clockwise from vertical ("skew") to give maximum "signal quality". For more information about skew, click HERE.
If you are getting no signal at all, then you may need to use a meter to locate the satellite position first.
Please DO inspect the dish assembly on delivery. If there is a problem please REJECT the whole delivery so you don't have to pay for return postage. Cosmetic faults, such as scratched paint, are deemed acceptable because we advise you to paint all parts (except the LNB cap that faces the dish) to protect them from the effects of sun and rain. Matt paint is recommended.
Dents and distortion to the face of the dish (no matter how slight) are not acceptable and you should reject any delivery where there is such damage. Slight rim damage is usually permissible if it does not affect the dish face.
If any parts are missing, please contact our SALES department using the email form and state which parts are missing.
Sky minidish LNBs are different from standard LNBs.
1. They have a "spigot" or "finger" which slides into the dish arm.
2. They are designed to focus on an oval area. This prevents them from picking up excessive background noise, which an ordinary LNB will do when used with an oval dish.
How can I tell if I have a minidish LNB?
By inspection of the feed horn shape.