All posts by Dave Lindsay
Below are all of Dave Lindsay's postings, with the most recent are at the bottom of the page.Mike Dimmick: How easy is it to connect two aerials, each for different transmitters?
Presumably there has to be a diplexer (or some sort of filtering). You can't simply connect via a splitter (in reverse).
I was looking at these here:
Online TV Splitters, Amps & Diplexers sales
So if, say, I wanted to receive Group A channels on one and Group B on another, I could use the first diplexer on that page (Channels 21 to 35 combined with 37 to 68 (i.e. split at CH36)). Simple. (OK, so a spanner could go in the works if a new mux goes on C36. Let's assume it will be rubbish and that I won't be interested in it!)
Now what if the UHF channels used by each transmitter aren't split so nicely?
Let's suppose I'm in King's Lynn. From the local relay I want 43, 46 and 49 (49 to be swapped for 39 at a later date). From Belmont I want 30, 53 and 60. How can this be made to work? (DN31NJ)
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Kenneth Timms: See:
Freeview signals: too much of a good thing is bad for you | ukfree.tv - independent free digital TV advice
I think you can get rid of that signal booster. (DN31NJ)
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june maxim: See the posting above yours entitled "Transmitter engineering".
Also, Digital UK website says that Aldeburgh is expected to be up and running by mid-afternoon:
Digital UK - Relay transmitter switching times (DN31NJ)
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Mike Kew: You will probably have to wait another two weeks until it is boosted to full DSO power. Only the BBC channels increased strength last night.
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Eileen Bosworth: The message itself suggests no signal. What aerial are you using?
Please can you post your postcode and someone might be able to help you further?
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Waltham (Leicestershire, England) Full Freeview transmitter
Wednesday 9 November 2011 5:21PM
Doncaster
Wednesday 9 November 2011 5:21PM
Doncaster
Jim: If you're looking at DIYing, or even if you just want to know more, I recommend taking a look at the highly-informative www.aerialsandtv.com website.
Personally I would steer clear of the DIY stuff.
The commercial muxes are at lower power than the PSBs, so they are the ones that you're going to have to work harder to get (from Waltham).
If you can't get them (commercial muxes) from Waltham, then another possibility is that you might be able to diplex the Waltham aerial with the one you already have on SC (assuming that it picks them up). You will need to look around for a suitable diplexer that combines the required UHF channel numbers.
The PSBs from Waltham are 54, 58 and 61. The Coms from SC are 39, 42 and 45.
C61 from Waltham is likely to change in the future in order to release the spectrum for 4G mobile services. I *think* that it is to be moved to C49 (can the pros shed more light on this?), but don't quote me on that.
So you *might* be looking to combine channels up to and including 45 with those 49 and above.
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Waltham (Leicestershire, England) Full Freeview transmitter
Wednesday 9 November 2011 5:54PM
Doncaster
Wednesday 9 November 2011 5:54PM
Doncaster
I said I would steer clear of DIY stuff and I must say that I have come to that conclusion having read the ATV website. I should add that I'm an interested anorak and not a pro.
The exception to this would be where a product is recommended by professionals.
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My Freeview box has no EPG, is blank on FIVE, ITV3, ITV4, ITV2+
Wednesday 9 November 2011 6:09PM
Doncaster
Wednesday 9 November 2011 6:09PM
Doncaster
Glenn: Try doing what I suggested to Ray. (Posting made at 8:55PM)
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Tuesday 8 November 2011 11:59PM
Doncaster
The digital signal from most transmitters is -7dB on the analogue. How does this affect the coverage area?
Is the reason for doing this due to the way in which digital pictures don't degrade as analogues do? And therefore, does DVB-T at -7dB equate to roughly the same coverage as analogue?