Briantist:Read this! You know you want to... is out! http://t.co/iZRMlAut0g Briantist:Box TV channels now available online - CMU Complete Music Update http://t.co/rgjyIdo0vy Briantist:Read this! You know you want to... is out! http://t.co/iZRMlAut0g ▸ Top stories today via @SEOSeanUK Briantist:Media Talk podcast Woolwich attack coverage and Boris ban lifted http://t.co/qe1Ag4afdQ yorkshirewander:RT @Briantist: New Google maps has some interesting bugs. you have to take a bus to get from Victoria Station to Victoria Station! http://t.co/I5bspH6UZR Briantist:Victoria Station #fail for new Google maps ... http://t.co/t7uCQruyDz Briantist:New Google maps has some interesting bugs. you have to take a bus to get from Victoria Station to Victoria Station! http://t.co/I5bspH6UZR mapperz:RT @Briantist: From the archive: Want to see where a point on a line of sight on a map? Click on UK Free TV! Here's another ... http://t.co/Mx19ptoKdb Briantist:From the archive: Want to see where a point on a line of sight on a map? Click on UK Free TV! Here's another ... http://t.co/Mx19ptoKdb Briantist:Now picks up Freesat advertising business - Advertising news - Campaign http://t.co/rSLGNsOWnZ
By using much higher frequencies (gigahertz, compared to terrestrial televisions megahertz) more transmission channels called transponders (the satellite equivalent of multiplexes) can be provided. For example, there are only six Freeview multiplexes, but Sky or Freesat users can access two hundred satellite transponders.
Aside from exceptional weather conditions (very heavy rain for example) digital satellite provides stable pictures and audio. Where Freeview transmitters are no more than 732 metres above sea level, the geostationary satellites used for television are 35,800,000 metres above the equator so reception is possible even where buildings, trees and hills make terrestrial reception impossible.
The downside of the transmitters being 22,300 miles up in the air is that the signals are very, very weak - so standard TV aerial is of little use. When the signals are sent to the satellites, huge dish transmitters are used to uplink the signal to the satellite. These are tens of metres from side to side, and feature an emitter that generates the signal, which is first bounced of a mirror (called a reflector) and then off the surface of the parabolic dish.
There are many satellites in the sky over the equator. Often these are in clusters over a particular position, for example there are four used for UK television are at 28.2 degrees east. There is another cluster over the 19.2 degrees east positions that are used for German television.
To receive these very weak signals from the satellite, it is necessary to use a dish for reception too. By using a reflective dish, this concentrates the signals onto a small device called a LNB. This is held in front of the dish by a metal arm.
The size of dish for reception is typically much smaller; often 60cm to 100cm in diameter, but the exact size depends upon the transmitting satellite transponder. To keep the transmission power levels down to levels that can be powered by the satellite's solar panels, each beam is focused on a particular area of the Earth's surface. If you are trying to receive the signal at the centre of this zone, a small dish is required. At the outer edges, you may need a 5 metre dish. Maps of these zones are provided by the satellite companies, and are called satellite footprints.
When the dish is installed it must be aligned carefully as the signal is very weak. The installer needs to know the inclination and the azimuth from the ground location to the satellite. If you install yourself you will find that there are markings on the dish that are used to point the dish in the correct position. It is important that the view of the satellite will not be blocked, so must take into account leaves growing on trees and potential building works.
For many people the LNB will have a single cable connected to it, however if you have Sky+ or a multi-room installation the LNB package will actually contain four receivers a quad-LNB. Unlike terrestrial television where you can split the aerial cable to feed more than one Freeview box or television set, with satelite reception you cannot. So, a Sky+ box with two receivers (so you can watch one thing and record another) has two cables connecting the box to the dish.
The cable that connects the dish to the receiver must be satellite grade cable. Whilst this looks superficially like the cable used to connect and aerial to a television, a higher grade cable is required for satellite reception.
Here is an image of a co-axial cable. This sort of cable is used to connect any type of receiving aerial to the reception equipment.
RG6, PF100 and PH100 are all types of coax cable that are suitable for the very weak signals that are received by a satellite dish. (The power is the same as you would receive from a one-bar electric heater on the moon).
The conductor in the centre passes the signals received from the dish to the set-top box. This is made from steel in RG6 cable, and from copper in the RF100 and PH100 types. This makes RG6 less suitable in the UK where rain can damage the cable.
The shielding is responsible for keeping unwanted external interference from damaging the signal. In the cheaper cable this will be a foil wrap, in better specified cables this is a braid (or mesh) of copper wires. The sheild in the RF100 covers 58% of the cable.
The non-conducting layer between the shield and the conductor is called the dielectric. This can be either a solid (RG6), foam (RF100) or air-spaced (PH100) dielectric. This makes the cables progressively more flexible (ie bendy without damage).
I have recently purchased a Freesat HD digitalbox. I already have a working sky dish and cabling. When I connected the Freesat box to the existing dish the signal strength is zero. Please can anyone post a possible cause and solution to this problem?
Keith: Assuming you have connected only the Freesatbox to the dish then the box may be faulty (return it for an immediate swap), but if you are using another output on the quad-LNB then it might be that output or possibly a cable fault.
Keith Thacker Monday 5 January 2009 10:31AM Burnham-on-crouch
Early last month, I asked whether it might it pay me to fit a 60 cm as opposed to a 43 cm dish to receive Freesat? I had very helpful replies from Mark of Aberfan Aerials and "Aerialman" who both suggested that I should go with the larger dish. In fact, I'm now thinking of fitting a Triax TD78 which is 70cm x 78cm and has a gain of 37.1 dB. They cost a bit more but I've got the space and a fairly unobtrusive and sheltered position and I want a system that can give good reception regardless of what the British weather throws at us. Can the experts think of any downside with using the larger dish please? Secondly, I already have a Sony PVR so see no need to fit the Humax Foxsat - HDR, especially as they are not yet being discounted. I do however want to record and play programmes at the same time and will run two cables from the dish to the receiver. I would go with the Humax Foxsat receiver but it has only one tuner. Can anyone please recommend a good twin-tuner receiver? Happy New Year to all!
Briantist: My Parents are looking to have Freesat installed, and they will require a dish. They will only be using it for a HDTV with built-in Freesat tunert at present, but may look to but a Freesat PVR in the future.
I'm concerned that the dish installer will install a dish with only one LNB, as that is all they need at present. How much of a problem will this create in the future if they wish to buy a PVR? Can you upgrade just the LNB, or will it be a whole new dish? Does a dish with a quad LNB cost more than one with a single LNB, and is it worth paying the extra therefore? What should they be telling the dish installer?
brian matthews it depends on if you are on about a tv with freesat built in, if it is then it will be hd ready anyway but if you are getting a tuner then you will need a hd tv to see hd channles in full hd it all depends on what you want
Quite a simple one i think, but here go,s.
I have just perchased a panosonic hd tv, with out the built in freesat.I am hopeing to install my old mini skydish coupled up to a humax freesat top box to recieve all of the freesat hd services. Is this feesable and any help on siteing the dish and the connection to lnb would be most welcome
Hi Dave, There is no point having both the panasonic freesat tv & the humax connected (unless the humax is the freesat+ recorder) as they both give exactly the same channels, If the humax is the freesat+ recorder you will need a quad lnb fitted to the dish & three cables from the quad lnb to the equipment, 1 cable should go direct to the panasonic's satellite input & the two others should go to lnb 1 & lnb 2 inputs on the humax recorder the humax should be connected to the panasonic via a hdmi lead. Mark Aberfan Aerials
Variable Freeview Signal Quality,
I am using a Humax HDD Rec. with a 40cm standarddish, after the leaves came out on the trees nearby which are higher than the house there was a severe loss of signal then no signal and a warning to check cables. I replaced the LNB with a Quad Thompson LNB which does Freesat and Sky/HD £48 from Currys. This works but with occasional signal problems when its good I get 85%signal / 50% Quality
1/ is the solution to get a bigger / higher quality dish
2/ are there higher sensitivity/better quality LNB's so I can avoid the need for a bigger dish?
3/ If all the signals are digital and all come from the same satellite, how do some TV Channels work well when others are very poor or do not work at all??
Roughly speaking zone 1 area is south of liverpool manchester huddersfield leeds & zone 2 area is above there & to the west inc isle of man, & all of ireland, however is common to see zone one dishes is use both in the north & in Ireland & they will work, they just wont have as much resistance to rain fade (reduction in signal level / quality in rain / snow).
Most riggers I know have a zone 2 dish or better,wherever they live !
If the end thing (f-con) is not a crimped on type, unscrew it & check to see if there is braid on the cable & none of it is touching the core (stinger) bit in the middle, push all the braid strands back over the cable outer then screw the f-con back on over the stands, check by looking into the pointy end to make sure no braid stands are touching the core & the screw back onto the sat input on the tv. the cable going back to the dish should be one piece without joins in if possible,
good luck !
stuart sandell: You can run as many boxes as you like, but each receiver (some boxes may have two) needs an independent connection to the LNB. Also, the LNB must have enough outputs. A quad LNB has four, for example, so you many need to get a quad LNB.
stuart sandell: When space can be found on the Astra 2D satellite. At the moment, FIVE is a public service and the BBC have given it space, but this can't happen for the two wholly commercial channels.
I am looking to get freesat but am not sure what the zones mean. From what I have seen it seems zone 1 is for the South and zone 2 is for the North where there is worse weather conditions. Is this correct? I am in the South East so think I could have a zone 1 dish but is there any benefit of having a zone 2 one? Thanks
I used to receive sky on contract. But now still have a sky box and dish, having purchased a new "card" and receive Free channels e.g. BBC and ITV. If I were to purchase a new Freesat TV could I use my existing "sky" dish and receive Freesat channels easily.
Hello – I’m from a home networking background and new to this satellite and aerial game but have been researching the posts. I've been running Cat5 cables for Vista and would welcome any advice.
I’m currently doing a barn conversion and have decided to wire 5 different rooms for satellite Freesat and Freeview. I’m planning on a Quattro LNB and a log periodic UHF antenna feeding into a Multiswitch in the loft, with 2 cables from the loft to each room to a Triple-plexer Plate. Which would hopefully allow FM/DAB to be added later. Plus a 3rd cable to the sitting room to enable a satellite receiver there to be used to feed the rest of the barn if needed in the future. The cable runs will be about 15m from LNB to Multiswitch and 17m from the Multiswitch to each of the Plates.
As it's a barn conversion subject to some sticky planning approvals, I want to use the smallest and most unobtrusive dish and wall mounting possible. Do you have any recommendations?
I am planning on using CT100 cable or PF100 from screwfix. Would either of these be suitable or do i need a lower loss cable to enable the smallest dish possible?
Also is it best to use the same cable from the LNB to Multiswitch, or do I need to get hold of some multi-core cable for this element?
Now to fitting and aligning the dish. I currently do not have mainspower at the barn and furthermore do not own a satellite receiver. Do I need to invest in some sort of battery powered satellite meter to identify the right satellite and to make sure that I’m getting the very best signal.
If I buy a meter I was looking at a Laguna Mk4 on Ebay which I thought I could sell again when i’ve done this job and a couple of others i’m working on what meter would you recommend?
How do I work a meter on the Quattro LMB, given that I’ve not got no power at the barn yet and so couldn’t use the output of the multiswitch to feed into a meter?
In addition to recommendations for the unobtrusive mounting kit, do you have any further recommendations on which Quattro LNB and Multiswitch. I should go with bearing in mind that I also want to try and keep the cost down?
Thanks ever so much for any help that you can give me.
CT/PF 100 will be fine for the whole job, the only advantage of multicore is it is colour coded making correct connections to the switch & octo easier, but if label the cable runs from the dish to the switch you should be ok.
when using a meter on a quatro you have to match the band to the output of the lnb, i.e. if you are connected t H/H on the quatro you need to select a H/H band frequency on the meter.
The luguna is a ok mid price meter that should suit your purpose.
unless the barn is listed you can use almost any dish you want, a good one is a triax td 54 which comes in charcoal colour .
FM / DAB connects either directly to inputs on the switch or via a combiner on the aerial feed to the switch
triax & vision switches & lnbs are good, but i suspect most switches / lnb's come out of the same factories in china whatever badge the have on them.
Martin Bradshaw - Itworks Friday 30 October 2009 9:47AM
Mark Aberfan Aerials - Many thanks Mark for taking the time and giving your expert opinion. It has been very helpful although i think i may be out of my depth taking on these satellite systems within these the barn conversions and i don't know were to begin with the communal system for the apartments . Would you have any cast iron recommendations of any qualified installation company's close to the Hereford/ Worcester area? I see from your website of which i was quite impressed with the pictures of your work, you would be an hour and half away. I don't suppose you would have any interest yourself? Martin Bradshaw - Itworks
Just purchased a Panasonic HD Tv with built in Freesat. I have a Sky dish and Sky+box. The existing LNB appears to have 4 outputs. (There are 4 holes on the underside.) A twin cable connects to 2 connections on the box. Dispite much research I'm still confused to exactly how to get Freesat reception.
a) Will existing LNB work if fitted with an additional cable?
b) Running in a new cable from dish to TV is a major hassle due to a sizable shed being in the way. Is there any other way?
I will be taking delivery of a Panasonic plasma TV with built-in Freesat next week and already have Sky +. I am upgrading to Sky + HD and moving my existing Sky + box to another room (to replace old Sky digibox). This will mean that all 4 outputs on the LNB will be used. Is there any point in wanting to use Freesat? I did think that I could put a splitter on one of the feeds to my Sky +HD box and that would allow me to connect the Freesat as well.
Not sure whether it would work or whether it's necessary.
I have a Grundig HD DigitalBox with FreesatHD. It is about one year old and has worked perfectly here in Spain until the end of September when it started to switch itself off and on together with the loss of programs.
I have tried to contact Grundig with-out success. It would appear they do not wish to know.
Have any other readers got the same problem? If so is there a possible solution, other than installing a new box (by a different manufacturer of course)?
I look forward to hearing some comment.
Regards to all.
Since turning to Taggert on Wednesday, Thursday and this evening I cannot receive any other channels. All other channels give a 'No signal or scrambled' message. I have a humax foxsat-hdr box and a milton keynes postal code.(Is this even relevant?