Full Freeview on the Reigate (Surrey, England) transmitter

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10:53 PM

David Curtis: Having made my earlier posting I have had a look at your local area. Clearly the trees might be the issue. I can see that there are quite a few bungalows and that aerials are on tall poles.

Perhaps, therefore, that the answer is to try moving the , your objective being to find a spot where they are all good.

R

Raoul Schepen
2:32 PM

I live in and have no ITV, Ch4 & 5, ITV2 which I assume is attributable due to the high pressure weather we're experiencing at the moment unless I need to my for a high one as mine is about 12 years old and might not be properly suited for

Raoul Schepen's 1 post GB flag

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2:54 PM

Raoul Schepen: Your possibly being of not the best type is not the issue!

There is no such thing as a "" aerial and a high aerial isn't always the answer.

The high transmissions of 2kW from Hill, which if my understanding is correct you are only a mile from, will be more than enough to make up for any potential shortfall in sensitivity of your aerial. In any case, the Public Service (PSB) , of which those you identify are one, are which is that formerly used by ITV's .

The point is that "if" your aerial a Group C/D one then it is most sensitive on the top third of the band of frequencies used for TV, with sensitivity sloping downwards through Group B (middle third) and Group A (bottom third). The PSB channels are on C/D channels, as were the four main analogue channels. The other channels (the COMs) are on Group A channels. The high power of these channels is what means that a C/D aerial will work at your location.

If anything I suggest that you investigate the possibility of there being too much signal:

Freeview signals: too much of a good thing is bad for you | Digital switchover | ukfree.tv - 10 years of independent, free digital TV advice

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Nick
10:04 PM
East Molesey

I live in Hampton Court (KY8 9BZ). I have two aerials in my , pointing 107 degrees from magnetic North. They were in place when we bought the house.
They both have horizontal 'blades' (pointing left - right).
The aerials were in place when we bought the house and deliver a to 4 sockets in the house.
We have never had any problems with , aside from slight pixilation when scooters go past, until the end of June when we suffered a big loss in signal resulting in loss of most . There have not been any changes in the house that we know of. I have checked the aerials, which look just the same as normal. I noticed that they both have red plastic stoppers at the end - don't know if that indicated the type or not.
Any advice gratefully received.

Nick's 3 posts GB flag

Nick's: N's Freeview map N's terrain plot N's frequency data N's Freeview Detailed Coverage

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12:45 PM

Nick: A red stopper means they are Group A aerials. uses Group A exclusively, even after , so there is no need to replace them because they are the wrong group:

Aerials, TV Aerial and Digital Aerial

According to UK, Crystal Palace is on a bearing of 82 degrees. I presume this is relative to either True North or Grid North. Magnetic North moves over time.

You may be in an area where 4G at testing was taking place:

at800 West London 4G tests

According to what we know on this site there are base stations on Hampton Court Way for the four mobile operators. On Streetview they can quite clearly be seen, all to the south of the river: two by the railway line and not far back from the river bank and three a few tens of metres away on on the grass verges.

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12:55 PM

Nick: You say there are two aerials feeding four points. How do the feeds split? Does each feed two points?

If there is a powered splitter (distribution ) involved then it might be that you can do away with it because the TV signals are so strong now has taken place.

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Nick
4:40 PM
East Molesey

Dave: Many thanks for your reply. Since the aerials looked professionally installed I was loath to move them, but I also worked out that was the best for my location and that it was on a different bearing to the current direction - so I moved them. This boosted the strength and considerably and I am able to see the (BBC1, 2, ITV, C4, C5) very well. I wasn't able to get other channels like Dave and Really etc. I thought about this again today and it occurred to me that if I am now receiving a signal from a different transmitter, I might have to re-tune (auto tune) the TVs?
I will also check at800.co.uk as this might explain why the signal suddenly dropped out and didn't return.
The aerials are both installed on the same pole and although are different brands are otherwise similar. They are mounted about 30-40 cm apart. All the wires go into a small box, but I will have to investigate further to tell you more about this.
Thanks again.

Nick's 3 posts GB flag

Nick's: N's Freeview map N's terrain plot N's frequency data N's Freeview Detailed Coverage

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5:22 PM

Nick: Whilst it is always good practice to check that the TV or box is tuned to the correct (and that you aren't trying to affect better with the pointing the wrong way), based on the of what might be available it does seem doubtful that this may be so.

Nonetheless, confirm by viewing the tuned UHF on the signal strength screen while on each of the following:

PSB1 | BBC One =
PSB2 | ITV =
PSB3 | BBC One HD =
COM4 | ITV3 =
COM5 | Pick TV =
COM6 | Film4 =

For a full list of service by (mux), see:

DTG :: DTT Services by Multiplex

Having checked one service from each mux, the rest "should" be the same.

The COM use a signal that is less rugged than PSB1 and PSB2. This is so they can get more in (more shopping channels!) and it comes at the expense of making them more fragile.

Consequently, the direction of the aerial will probably be more critical for them. I am not an aerial installer but I know this from my own experience. Whilst all five definition muxes are radiated at the same from my transmitter, which is , on turning the aerial off-beam the COMs are lost but the PSBs are still strong. I guess that as also has all muxes at the same power (not all do) then a similar situation may exist.

N

Nick
4:44 PM
East Molesey

Dave: Brilliant . I really appreciate the effort you've gone to to me.
What you say makes sense based on my observations so far. I will do what you suggest tonight to see if I am receiving a good from a service from each mux. My TV has a good info screen with signal strength and bars. When I realigned the the other evening it was more of a hunch than a definite intention and I can probably improve the accuracy as well.
Will let you know the results. Thanks again.

Nick's 3 posts GB flag

Nick's: N's Freeview map N's terrain plot N's frequency data N's Freeview Detailed Coverage

D

David Curtis
11:43 PM

David Lindsay,

Not familiar with the blog system so have only just discovered your replies to my July 1st!

Why should Ch 49 be the only affected? All the others are 10/10.