All posts by Dave Lindsay
Below are all of Dave Lindsay's postings, with the most recent are at the bottom of the page.
Adrian: I've never used a satellite a receiver, so am commenting based on what I know.
The LNB is fed with a voltage whose level "tells" it what polarity to use. Thus, the receiver sends a voltage to the LNB out of the satellite socket.
If there was a short circuit between the inner conductor and the screen then this would, by its nature, "overload" whatever is supplying the voltage. I would be inclined to turn off the TV and/or disconnect the lead to the dish pronto as you may be damaging the TV, particularly if it isn't designed to stop supplying the voltage when it recognises an overload (I don't know whether they do this).
Look for a short which could be a single strand.
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Lesley: The issue with the receiver picking up and tuning to Skipton (which is the reason for the filter) is one which applies only when the set is tuned. The receiver scans all frequencies and then must make a "decision" as to which it will put as the main ones. The filter simply stops it from ever seeing the Skipton signals. Unplugging the aerial lead after the first 30% should achieve the same result. Only if the thing retunes when unattended (which can sometimes be a nuisance in situations such as yours) might the Skipton signal come into play in which case the filter might be the only solution. The filter does not have to be fitted at the aerial end and can be fitted behind the TV so as to allow it to be removed easily, should the need arise.
If you receive from Skipton then you will get Yorkshire regional programming whereas Pendle Forest broadcasts North West. Skipton only carries Public Service (PSB) channels whereas Pendle Forest carries all Freeview channels. Therefore those who have no choice but to use Skipton (or one of 1,000 other similar transmitters) only get PSB channels.
If the purpose of combining aerials for Pendle Forest and Skipton is to pick up Skipton PSBs and Pendle Forest COMs (the channels that Skipton doesn't broadcast), then is it only the Pendle Forest PSBs that are the issue? If it isn't and it is all Pendle Forest channels, then you will be no better off for the COM channels.
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Frank: See the posting from Transmitter engineering above; there are ongoing engineering works.
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Tom Halsall: Evidently your TV is tuning to one of the transmitters in Wales, probably Moel y Parc. From the Welsh transmitters S4C uses logical channel number (LCN) 4 and Channel 4 is on LCN 8.
The signal strength screen should help you identify what you are picking up.
For Winter Hill ITV1, C4, C5 etc are on C59 whilst Moel y Parc is on C39 (if it gives frequencies in MHz, these are 778MHz and 618MHz respectively).
Running the automatic tuning scan with the aerial unplugged and then plugging in around 55% should avoid Moel y Parc whilst being connected for Winter Hill.
If the set retunes itself when unattended, then this may or may not be an issue. If it turns out to be, then look to see if there is a setting that can be disabled, something along the lines of automatic update or add new channels automatically.
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makelele: I found this page on the National Communications Authority's website:
Digital Switchover Project - National Communication Authority
It states that the DVB-T2 standard will be adopted which is that used in the UK for Freeview HD. Freeview standard definition uses the earlier DVB-T standard, so they will not work in Ghana.
In short, it will need to have a Freeview HD receiver to receive Ghanese TV broadcasts.
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Philip Lane: I would check that it is tuned to the correct transmitter.
Answer to question 2 depends on what is the issue!
Bring up the signal strength screen and it should hopefully tell you which UHF channel it is tuned to. HD from Midhurst is on C58 and Heathfield's is on C47.
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brian: There are a few horizontally polarised relays; Kensal Town and Alexandra Palace are both so.
Probably two male F-connectors with a back-to-back female adaptor covered in self amalgamating tape to waterproof it:
Satellite, Television, FM, DAB, Aerial, Coaxial Cable, Plugs, Sockets, Connectors & Leads
Make sure that it is covered entirely and that no water can get in.
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Wilf Fletcher: I should imagine that the West Midlands transmitter that it has tuned to is The Wrekin.
In which case, run the automatic tuning scan with the aerial unplugged for the first 50%.
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Sunday 16 December 2012 1:23PM
brian manley: I have drawn up the following list of transmitters that probably overlap with Greenwich to some degree:
48H Kensal Town
49H Alexandra Palace
50V Lea Bridge
52H Kensal Town
53V Woolwich
54H Alexandra Palace
55V Lea Bridge
56H Kensal Town
57V Woolwich
58H Alexandra Palace
59V Lea Bridge
60V Woolwich
The others seem definately likely, but I included Lea Bridge as it was the only other one that fitted in. It is definately a "maybe" as it's only 2W and not directed towards Greenwich. The only thing we do know is that it wasn't co-channel with Greenwich pre-DSO and isn't co-channel now.