Receiving Freesat signals
Robin7
Posts: 96 Forum Member
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This may sound like a silly question but I am not very knowlegeable and would appreciate any response. I have a quad LNB on my dish and when out in my caravan I obviously receive freesat channels OK, I have my own Post Code logged into my Humax recorder and use two feeds from my LNB.
My question is if there was someone else on a pitch next to me and they used one of the other two feeds on my quad LNB to their receiver, if they have their own Post Code logged into their receiver will they receive all freesat channels and local weather for both post codes having two different receivers with two different Post Codes logged into the receiver connected to the same LNB, i.e. their receiver and mine. I hope this makes sense. Thanks in anticipation for any response. ATB Rob.
My question is if there was someone else on a pitch next to me and they used one of the other two feeds on my quad LNB to their receiver, if they have their own Post Code logged into their receiver will they receive all freesat channels and local weather for both post codes having two different receivers with two different Post Codes logged into the receiver connected to the same LNB, i.e. their receiver and mine. I hope this makes sense. Thanks in anticipation for any response. ATB Rob.
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Comments
One thing to be aware of is that the electrical supplies need to use the same phase, for example sharing an LNB with the house next door can be dangerous. I would imagine it's okay on a caravan site but I don't know anything about caravan sites.
The grid comes in 3 phases 120 degrees apart. Your house will use just one of them as will your caravan, your neighbour will also use one of the phases but it may be different to the one you use and if so that can be dangerous in the event of a fault occurring. I expect the caravan next to yours would be on the same phase but I know absolutely nothing about how caravan parks are wired so don't know.
As a general rule you should not share LNBs between properties (or caravans) unless you know what you are doing.
The reason adjacent properties are on different phases is to balance the load on the cable. Any inbalance appears as a current on the neutral conductor.
Under fault conditions this can be transferred between properties.
Basically in this circumstance all the coax leads screens are bonded together and connected to earth with a conductor capable of carrying the full potential earth fault current. .
Provided the Caravan Site is installed to full up to date safety standards you have little to worry about.
1 It would be madness to mount electrical sockets that are designed to connect to long leads on different phases within a distance that two leads could create a phase to phase voltage.
2 They will be protected by near instantaneous rcd (residual current detection) circuit breakers and also have current limiting MCB's. These devices operate in a fraction of the time a conventional fuse takes to blow and in the case of an earth fault wouldn't operate at all.
Basically right, although since 2008 the nominal mains voltage is actually 230V for single phase and 400V for three phase supplies.
It's all to do with European harmonisation, the 220V countries also changed to 230V at the same time as the 240V ones (although the allowed tolerances actually allow the voltage to rise above 240 and fall below 220 dependant on application).
A tad misleading, the EU specified a nominal voltage throughout the EU. In reality nothing changed, The 11000/415V transformers supplying the LV networks do not have onload tap changing capabilities. To change the ratios require each transformer to be taken off load and the internal winding tap moved (A massive task). Reducing the 11Kv system voltage at the primary transformer would increase system losses down to the extra current required to meet the same demand for demands that aren't voltage dependent. So nobody changed a thing, only the way the nominal voltage is expressed. If you check most peoples supply voltage it will still be around 240V in the UK, other than under maximum LV network loads - normally late afternoons after clock change means people are still at work after the lighting load is applied. . There has always been a permissible voltage variation +/- 6% except under emergency load shedding when National Grid can call for a temporary reduction of 12% (in specific areas) to avoid load reduction by disconnection. There's no magic control you can change the voltage supplied to every consumer. You can only maintain a voltage profile at the last point the supply transformers have on load tap changers with automatic control. Voltage control on the 400/275Kv network is down to the excitation levels of the supplying generators and any dynamic compensation that NGC and your ISP have connected to the network.