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First we need to know a little more details about the kind of TV you have, the kind of service (Cable, Satellite or off Air).
Comparing showroom to your home is also something we need to know. Was the showroom using Cable or Satellite. Satellite will always have a better picture quality wise.
If you are using composite input for the signal path between TV and source this would not produce a High Dif picture Composite = Yellow for video, red and white for audio. If you are using Component source that will produce a HD signal cable is RED/BLUE and Green with different audio.
The best quality is using an HDMI cable, this is all in one cable and the sources is the best. One last thing, if you are using the RF *cable as source it will not give you a quality signal.
Three things here the unit the cable or the LNB.
Simple things first Cable
Check the satellite plugs on Both ends are correctly fitted and there is no shorting of the core central cable and the shield. Check the cable with a meter put a loop( connect core to shield at one end) on the other end and check resistance.
Check your unit with a know good setup a friends perhaps.
3. LNB the unit on the arm of the dish
You should be able to get a signal from the LNB with a alignment meter. or replace with known good to test
A word of warning! Do not attempt to split any feed coming from a single output LNB to another satellite box - you will be asking for trouble!
Now for the solution. If you are using a standard sky minidish you will need a 40mm adaptor kit, a dual output LNB and another length of satellite cable (Webro WF100 prefereably) but I suppose RG-6 will do the job providing it is not too long (around 10-15 meters or so) a couple of F connectors and self-amalgamating rubber tape.
Power off everything! Remove the old LNB and to do this you'll notice a plastic rivet on the LNB arm of the dish which must be removed. When you have done that and the new LNB is place (don't tighten everything yet), connect your current length of cable to one output and the new length to the other (finger tight should be fine) and make sure BOTH of your boxes are connected. Remember to waterproof those LNB connections.
Power on! You should be getting pictures - if not the LNB will need skewing round a bit. Look at the dish from the front and turn the LNB in a clockwise position say the 2 o'clock position - that should do the trick. Then tighten everything.
I wish you well with it - good luck! (:-)
The 311 receiver is normall a pretty tough machine. Getting a 70 % signal is normal, and it shouldn't fluctuate too much unless you have something like a tree or other obstacle in the way.
85% of the problems with these older systems is the LNB. I see it all the time.
My first suggestion would be changing the LNB (the eye of the dish). You say that your system is 10 years old, and there are a lot of LNB's out there that go bad over time. It may say that you are getting signal, but the quality may be so poor that the receiver may not know what to do with it.
If you have 2 LNB's (separate eyes) on your dish, then you have two singles or duals with a switch 21. I'd remove these and replace them with a Legacy Twin LNB. If you have a Twin LNB, then replace it with another Twin (especially if it has "lot" number printer in the front of it, these are notoriously bad).
You will need a DP or Legacy twin or quad, or DPP twin without using an external switch. If you use Legacy Duals, or DP Duals you will need a switch. USUALLY a SW21 is used to combine the signals but you may have a different one in use if at all.
The primary thing to remember when using a switch is that you must use the same type of LNB as switch e.g. Legacy switches with Legacy LNB's and Dish Pro switches with Dish Pro LNB's.
Check your LNB type. Legacy LNB's have only a Dish Network Logo on them, Dish Pro has DP on them and DPP have DP PLUS on them.
One of three things could be the cause:
1. Line of site. Must be clear of all obstructions to ensure adequate signal.
2. You have a faulty switch, or conflicting LNB and switch, or no switch at all.
3 you may have a bad port on the LNB.
As a fail safe check that your mount is level and plumb. You also may have the dish pointed directly at 119. Check the Skew and elevation settings as well. If LOS IS THE ISSUE YOU MAY NEED TO RELOCATE THE DISH OR REMOVE THE OBSTRUCTION.
In some extreme cases microwave towers and High Voltage lines also pose a problem but doubt this is the case for you.
I looks like you are picking 110W with the LNB on your left if you are facing the dish.
Try to get 119W first if you connect the cable to the 119 LNB, once you find 119W that way, you will also have 110W.