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% | ||
1:24 AM
My TV has just stopped, Am getting the message on screen, NO OR BAD SIGNAL, It went of about an hour ago, 12.30 ish ???????
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12:10 PM
Reading
Ken Dalton: At a guess, you were using the Emley Moor transmitter, which was shut down for maintenance from around midnight to around 6am on Wednesday.
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Mike's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage
4:35 PM
I fitted a MXDAT45 and an 26dB mast head amp then feed into a 8way amplifier all has been will for months I was called by the custoner a few days ago to say he had lost some cannals on all five of the sets I retuned all and found at off the 105 channals he had thear now was only 51 i ran the main aerial to his set re tuned and got back all 105 as befor so i suppected the 8 way amp But i was not happy As with the old uhf i new to much signal was a bad thing so in inserted a 3dB attenuater to the imput off the 8way which has cleared the problem Dus this sound right ??? Thamk you
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terry ireson: Digital reception requires the perfect reception of the digital multiplex. Attempts to increase the signal strength will usually destroy the signal, not improve it.
Remove the boosters from your system, fitting attenuators to a boosted signal is just asking for trouble.
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10:18 PM
terry ireson, did you run the main aerial to his tv set with the 26db mast amp or with out it? that would cause more over power than an 8way which you would need in the system
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6:46 AM
Ashford
I have a Pnasonic HD ready/Freeview TV. This is fed by an external (new) wideband digital aerial plus a power driven signal booster in the loft, fitted by aerial installer. The Transmitter is DOVER. 95% of the reception on the digital channels is Good - but I experience picture freezing/pixellation intermittently. All aerial connections have been checked to be OK. This interference does not seem to relate to any home based elecrical equipment. Could this problem relate to pre-switchover transmitter signal strength? I have temporarily by-passed the booster unit, the signal disappears! BBC1 & 2 are most affected.
Thanks for your time
Christopher Coe
TN26 3SG
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CHRISTOPHER's: mapC's Freeview map terrainC's terrain plot wavesC's frequency data C's Freeview Detailed Coverage
11:17 AM
Christopher Coe: Dover transmits three of the multiplexes - 1, 2 and C - on two different frequencies. The second set, which aren't in the old aerial group, are often called 'Dover B' and are listed on this website at Freeview on Dover B TV transmitter | ukfree.tv - independent free digital TV advice (except, for some reason, Mux C on C39+ is missing). These two sets are transmitted from different sets of aerials pointing in different directions.
Many boxes just store the services in the order they were found, scanning from the lowest frequency to the highest. If you've just exchanged a grouped aerial for a wideband, but are out of the proper coverage area for 'Dover B', you may find that your box now tunes in 'Dover B' when it didn't before.
Check for another version of the channels in the 800s, or elsewhere in the channel list. If you want to move them to the proper positions, see Digital Region Overlap.
Digital UK's predictor does show a good chance of reliable results from Dover right now, on all except Mux A, but it doesn't differentiate between the two different frequencies available, it just shows the prediction for the best one, so I'm afraid I can't say which is best for you.
Unless you're splitting the signal to feed multiple TVs, you really shouldn't need a booster after switchover - indeed you shouldn't need one now. In fact a wideband aerial isn't necessary immediately after switchover either - all post-switchover services are in Group C/D. There are proposals on the drawing board to launch new services in a lower frequency range, which will require a wideband, but we're still waiting for information on whether Ofcom will dedicate this range to TV services, and on how they will be auctioning it.
If you still can't get it to tune in reliably, call the installer back.
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11:24 AM
Bradford
Has anyone any information about connecting a TV signal booster into a TV ariel feed?
I am living in the Bradford area and have full Freeview reception but some of the channels have low signal strength and so tend to 'drop out' when being viewed. I live in a block of flats and so share the ariel. Would a booster connected to my ariel feed reduce the 'drop out' problem?
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Grant's: mapG's Freeview map terrainG's terrain plot wavesG's frequency data G's Freeview Detailed Coverage
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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