Post switchover signal strength.
Brian Butterworth published on UK Free TV Stephen Phillips asked about the relative strength of the analogue and digital signals.
Below is a table which shows the absolute and relative values.
The table lists the names of all the current digital transmitters, their current average power output for Freeview, the current average output for analogue, the post-switchover average output for Freeview.
It is worth noting that the Freeview signals will be doing their bit to save the planet - being at around 20% of the current analogue levels.
Current digital | Current analogue (W) | Post-switchover(W) | Digital Increase | Final d:a | ||
75 | 500 | 100 | 133.33% | 20.00% | ||
2000 | 100 | 15000 | 750.00% | 15000.00% | ||
1000 | 100000 | 15000 | 1500.00% | 15.00% | ||
7166 | 500000 | 116666.67 | 1628.06% | 23.33% | ||
5800 | 500000 | 75000 | 1293.10% | 15.00% | ||
20000 | 500000 | 100000 | 500.00% | 20.00% | ||
1666 | 100000 | 25000 | 1500.60% | 25.00% | ||
2666 | 30000 | 20000 | 750.19% | 66.67% | ||
1000 | 10000 | 2000 | 200.00% | 20.00% | ||
122 | 10000 | 2000 | 1639.34% | 20.00% | ||
45 | 1000 | 200 | 444.44% | 20.00% | ||
31 | 2 | 400 | 1290.32% | 20000.00% | ||
500 | 100000 | 11000 | 2200.00% | 11.00% | ||
4133.33 | 500000 | 72222.22 | 1747.31% | 14.44% | ||
3833 | 500000 | 75000 | 1956.69% | 15.00% | ||
2000 | 100000 | 15000 | 750.00% | 15.00% | ||
4166 | 100000 | 15000 | 360.06% | 15.00% | ||
36 | 2000 | 466.67 | 1296.30% | 23.33% | ||
2000 | 100000 | 15000 | 750.00% | 15.00% | ||
20000 | 1000000 | 200000 | 1000.00% | 20.00% | ||
2000 | 100000 | 15000 | 750.00% | 15.00% | ||
2483 | 500000 | 75000 | 3020.54% | 15.00% | ||
1000 | 100000 | 60000 | 6000.00% | 60.00% | ||
10000 | 500000 | 75000 | 750.00% | 15.00% | ||
800 | 100000 | 15000 | 1875.00% | 15.00% | ||
8166 | 870000 | 174000 | 2130.79% | 20.00% | ||
20 | 2000 | 400 | 2000.00% | 20.00% | ||
50 | 10000 | 1500 | 3000.00% | 15.00% | ||
100 | 10000 | 2000 | 2000.00% | 20.00% | ||
10000 | 250000 | 37500 | 375.00% | 15.00% | ||
183 | 1000 | 750 | 409.84% | 75.00% | ||
1200 | 100000 | 20000 | 1666.67% | 20.00% | ||
200 | 10000 | 2000 | 1000.00% | 20.00% | ||
3666 | 100000 | 15000 | 409.17% | 15.00% | ||
5 | 250 | 50 | 1000.00% | 20.00% | ||
20 | 500 | 150 | 750.00% | 30.00% | ||
1000 | 100000 | 15000 | 1500.00% | 15.00% | ||
91 | 10000 | 2000 | 2197.80% | 20.00% | ||
383 | 10000 | 2000 | 522.19% | 20.00% | ||
1000 | 100000 | 11287.5 | 1128.75% | 11.29% | ||
183 | 10000 | 2000 | 1092.90% | 20.00% | ||
25 | 6 | 1300 | 5200.00% | 21666.67% | ||
800 | 100000 | 15000 | 1875.00% | 15.00% | ||
1000 | 100000 | 15000 | 1500.00% | 15.00% | ||
200 | 2000 | 400 | 200.00% | 20.00% | ||
9166 | 500000 | 100000 | 1090.99% | 20.00% | ||
1250 | 100000 | 15000 | 1200.00% | 15.00% | ||
Moel-Y-Parc | 416 | 100000 | 15000 | 3605.77% | 15.00% | |
37 | 2000 | 400 | 1081.08% | 20.00% | ||
91 | 1000 | 1500 | 1648.35% | 150.00% | ||
8000 | 500000 | 75000 | 937.50% | 15.00% | ||
91 | 500 | 100 | 109.89% | 20.00% | ||
183 | 2000 | 400 | 218.58% | 20.00% | ||
9666 | 500000 | 75000 | 775.92% | 15.00% | ||
15 | 250 | 50 | 333.33% | 20.00% | ||
833 | 100000 | 15000 | 1800.72% | 15.00% | ||
1850 | 100000 | 15000 | 810.81% | 15.00% | ||
150 | 10 | 2000 | 1333.33% | 20000.00% | ||
2000 | 100000 | 15000 | 750.00% | 15.00% | ||
10000 | 100000 | 15000 | 150.00% | 15.00% | ||
200 | 10000 | 1336 | 668.00% | 13.36% | ||
20000 | 500000 | 200000 | 1000.00% | 40.00% | ||
1333 | 100000 | 15000 | 1125.28% | 15.00% | ||
36 | 2000 | 400 | 1111.11% | 20.00% | ||
690 | 10000 | 2000 | 289.86% | 20.00% | ||
18333 | 1000000 | 200000 | 1090.93% | 20.00% | ||
3000 | 50000 | 7500 | 250.00% | 15.00% | ||
50 | 5000 | 1000 | 2000.00% | 20.00% | ||
2500 | 250000 | 37500 | 1500.00% | 15.00% | ||
51 | 2 | 560 | 1098.04% | 28000.00% | ||
5033 | 250000 | 100000 | 1986.89% | 40.00% | ||
8000 | 1000000 | 200000 | 2500.00% | 20.00% | ||
6666 | 250000 | 100000 | 1500.15% | 40.00% | ||
1000 | 100000 | 15000 | 1500.00% | 15.00% | ||
125 | 20000 | 4000 | 3200.00% | 20.00% | ||
100 | 10000 | 4000 | 4000.00% | 40.00% | ||
4500 | 250000 | 37500 | 833.33% | 15.00% | ||
5833 | 500000 | 75000 | 1285.79% | 15.00% | ||
367 | 10000 | 4000 | 1089.92% | 40.00% | ||
9166 | 500000 | 100000 | 1090.99% | 20.00% | ||
Grant Buckley: Looking at the location and the fact that your aerial is, one assumes, on the top of the six storey block, you should not have any issues with signal strength.
Where a communal aerial system is provided, then the signal should be the appropriate level when it comes out of the wall socket. If it's not, then it is the operator's responsibility. The operator is probably the landlord.
However, the first thing to check is that the your receiver is tuned to the signals from the transmitter to which the aerial faces. The height of the aerial makes it very likely to be receptive to signals from other (which the aerial does not face).
Which programme channels show low signal strength and drop-out?
Also, for each of the following, go to the signal strength screen and let us know which UHF channel it is tuned to. Receivers usually give this information, although not always.
BBC One (probably channel 24 or 47)
ITV1 (probably channel 21 or 44)
BBC One HD (if applicable) (probably channel 27 or 41)
ITV3 (probably 42 or 51)
Pick TV (probably 45 or 52)
Yesterday (probably 39 or 48).
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Grant Buckley: Yesterday will probably be 39 or 48; let us know which.
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2:35 PM
Thanks for getting back so quickly. The main channels are all OK - BBC 1 & 2 on 47, ITV 1 on 44, Ch4 on 44 & Ch5 on 44.
The channels, which I would want to watch, that are causing the problems are:
ITV3 on 51, Dave on 52, ITV 4 on 48 (varies), Dave ja vue also on 52 (don't understand how this is the same as Dave), ITV2 + 1 on 51, E4+1 on 52, 5* & 5 USA both on 51, Quest on 51, Channel 5+1 on 51 and Food network on 52.
I don't understand how the programme channels can share the broadcast channels, but I suppose that is the 'digital' bit.
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Grant Buckley: Your reply has confirmed that all channels are tuned correctly to the same transmitter, Emley Moor.
As you have found, digital broadcasts carry a number of services as part of the same signal. That is you get a basket of programme channels on one frequency known as a multiplex. The six I listed above are each part of a different multiplex.
When did this problem begin?
Have you tried changing the aerial lead from the wall to the TV? Is it short?
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5:47 AM
Dave Lindsey: I moved in to the flat a couple of weeks ago and so, with settling in, it has taken me a bit of time to find the pattern of behaviour of the channels.
I have put a shorter aerial cable in place and this morning the signal strength, on the affected channels, seems to be better.
I'll monitor it and let you know of any prolonged improvement. Thanks.
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7:58 AM
Dave Lindsey: It looks like the shorter, better quality aerial cable has solved the problem - thanks.
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