All posts by Michael Perry
Below are all of Michael Perry's postings, with the most recent are at the bottom of the page.
Michael Martin:
The title 'Channel 4' is merely a title for the services. It was chosen before the service started as it would be the fourth 'channel', joining BBC1, BBC2 and ITV. It is merely a name, nothing more. The same is true for Channel 5 (or C5) and for S4C, etc.
When we refer to the Logical Channel Numbers, LCNs, we are talking about the number you enter on your remote control to select a particular service, the number being chosen by Freeview, Freesat or Sky, etc.
When we refer to channels we are talking about the frequencies allocated for TV transmissions, these days it is the multiplexes that are broadcast on a particular frequency from a particular transmitter. These are the channels 21 to 68 (or in some cases 69) which refer to an internationally agreed frequency per 'channel'. You can find these by looking at https://en.wikipedia.org/…ies.
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Maie Richards:
The maps show you are likely to be using the Haywards Heath transmitter, which is a Freeview Lite type so only carries the multiplexs BBC A, D3&4 and BBC B HD. If you are using Crystal Palace, the multipexes ARQ A and COM 7 are shown as variable reliability. Or you might be using the Heathfield transmitter, so check which it is currently tuned to. Heathfield is not shown as carrying COM7 or COM8.
If you go to Channels At Your Address | Freeview and there the details asked for you should get a listing of the services available at you particular location. It is approximate though.
If it is listed there, check which transmitter it is said to be available from at that location and then check whether your TV is tuned to that particular transmitter by looking at the channel frequency numbers and also check the signal strength (too much or too littyle is not good - over 85% is too much).
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Ray Earl:
Looking at the listing given at Coverage Checker - Detailed View (which is the link under your posting as 'digitaluk trade) it looks as if you should be using Hannington and not Rowridge.
If after checking all your aerial cables and connections and that your TV is indeed tuned to Rowridge VP (check the channel number shown for each multiplex), then you may need to consider trying Hannington. Note though that your aerial for Rowridge is not ideal for Hannington, so some results will be unreliable unless you change your aerial for a log-periodic type that will cover both sources with some adjustment of where it is aimed, bearing 347 degrees for Hannington or 196 degrees for Rowridge (either HP or VP).
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John Baker:
Your post code as given is just 3 km from the Melling transmitter so you should have a very good signal, maybe too much? Please will you check what the signal strength reported by your TV set is forthe channels giving the problem. Ideally you want between 60% and 85% strength - anything more will cause the problems you report.
If the signal is too strong then you can insert an attenuator into the aerial feed, but don't let the weight of it 'hang' on the aerial socket but use a short flylead to connect it to the back of the set. Attenuators are quite cheap and can be bought from several on-line suppliers or the likes of Maplins.
Let us know if that helps, please.
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Wayne Todd:
To assist with your query we need you to provide a full post code of your location please? TGhat way we will be able to determine what the reception is like from the different transmitters.
As far as is understood at present, there is not expected to be any changes to the services being broadcast currently. Emley Moor and Belmont. both being 'main' transmitters, are likely to carry the same mix of programming with regional differences only.
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Jason T:
We need a full post code for you location so that we can determine the reception conditions there and possibly see if there are alternatives.
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Adrian Jones:This is a well known phenomenon as the small amount of corrosion on the contacts causes frequency selective attenuation. It has been known about since the day of VHF 405 line TV transmissions and even affected VHF radio. Your action of unplugging and re-inserting the aerial plug was the correct sollution and what would have been suggested by many contributors who have experience of correcting TV reception issues.
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nicholas:
The international agreement allocating the bands used for TV services allowed Australia and a number of oriental and African countries to use Band 2 for TV services. In Europe, including the UK, Band 2 was allocated for FM radio services whilst Bands 1, 3, 4 and 5 were for TV broadcasts. In the US, they had a slightly different allocation of bands.
There is a lot of information about this on several websites.
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George Quarless:
Your comment would better be addressed to the broadcaster rather than this independent wevsite which is intended to offer assistance for reception problems.
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Thursday 10 August 2017 5:36PM
So Murphy:
It is still transmitting as it has done for some years. If it had ceased transmission there would be thousands of complaints!
So check your aerial, cables and equipment.