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Post switchover signal strength.

Stephen Phillips asked about the relative strength of the analogue and digital signals.

Stephen Phillips asked about the relative strength of the analo
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.

Transmitter

Current digital

Current analogue (W)

Post-switchover(W)

Digital Increase

Final d:a

Aberdare

75

500

100

133.33%

20.00%

Angus

2000

100

15000

750.00%

15000.00%

Beacon Hill

1000

100000

15000

1500.00%

15.00%

Belmont

7166

500000

116666.67

1628.06%

23.33%

Bilsdale

5800

500000

75000

1293.10%

15.00%

Black Hill

20000

500000

100000

500.00%

20.00%

Blaenplwyf

1666

100000

25000

1500.60%

25.00%

Bluebell Hill

2666

30000

20000

750.19%

66.67%

Bressay

1000

10000

2000

200.00%

20.00%

Brierley Hill

122

10000

2000

1639.34%

20.00%

Bristol Kings Weston

45

1000

200

444.44%

20.00%

Bromsgrove

31

2

400

1290.32%

20000.00%

Brougher Mountain

500

100000

11000

2200.00%

11.00%

Caldbeck

4133.33

500000

72222.22

1747.31%

14.44%

Caradon Hill

3833

500000

75000

1956.69%

15.00%

Carmel

2000

100000

15000

750.00%

15.00%

Chatton

4166

100000

15000

360.06%

15.00%

Chesterfield

36

2000

466.67

1296.30%

23.33%

Craigkelly

2000

100000

15000

750.00%

15.00%

Crystal Palace

20000

1000000

200000

1000.00%

20.00%

Darvel

2000

100000

15000

750.00%

15.00%

Divis

2483

500000

75000

3020.54%

15.00%

Dover

1000

100000

60000

6000.00%

60.00%

Durris

10000

500000

75000

750.00%

15.00%

Eitshal

800

100000

15000

1875.00%

15.00%

Emley Moor

8166

870000

174000

2130.79%

20.00%

Fenham

20

2000

400

2000.00%

20.00%

Fenton

50

10000

1500

3000.00%

15.00%

Guildford

100

10000

2000

2000.00%

20.00%

Hannington

10000

250000

37500

375.00%

15.00%

Hastings

183

1000

750

409.84%

75.00%

Heathfield

1200

100000

20000

1666.67%

20.00%

Hemel Hempstead

200

10000

2000

1000.00%

20.00%

Huntshaw Cross

3666

100000

15000

409.17%

15.00%

Idle

5

250

50

1000.00%

20.00%

Ilchester Crescent

20

500

150

750.00%

30.00%

Keelylang Hill

1000

100000

15000

1500.00%

15.00%

Keighley

91

10000

2000

2197.80%

20.00%

Kilvey Hill

383

10000

2000

522.19%

20.00%

Knock More

1000

100000

11287.5

1128.75%

11.29%

Lancaster

183

10000

2000

1092.90%

20.00%

Lark Stoke

25

6

1300

5200.00%

21666.67%

Limavady

800

100000

15000

1875.00%

15.00%

Llanddona

1000

100000

15000

1500.00%

15.00%

Malvern

200

2000

400

200.00%

20.00%

Mendip

9166

500000

100000

1090.99%

20.00%

Midhurst

1250

100000

15000

1200.00%

15.00%

Moel-Y-Parc

416

100000

15000

3605.77%

15.00%

Nottingham

37

2000

400

1081.08%

20.00%

Olivers Mount

91

1000

1500

1648.35%

150.00%

Oxford

8000

500000

75000

937.50%

15.00%

Pendle Forest

91

500

100

109.89%

20.00%

Plympton

183

2000

400

218.58%

20.00%

Pontop Pike

9666

500000

75000

775.92%

15.00%

Pontypool

15

250

50

333.33%

20.00%

Presely

833

100000

15000

1800.72%

15.00%

Redruth

1850

100000

15000

810.81%

15.00%

Reigate

150

10

2000

1333.33%

20000.00%

Ridge Hill

2000

100000

15000

750.00%

15.00%

Rosemarkie

10000

100000

15000

150.00%

15.00%

Rosneath

200

10000

1336

668.00%

13.36%

Rowridge

20000

500000

200000

1000.00%

40.00%

Rumster Forest

1333

100000

15000

1125.28%

15.00%

Saddleworth

36

2000

400

1111.11%

20.00%

Salisbury

690

10000

2000

289.86%

20.00%

Sandy Heath

18333

1000000

200000

1090.93%

20.00%

Selkirk

3000

50000

7500

250.00%

15.00%

Sheffield

50

5000

1000

2000.00%

20.00%

Stockland Hill

2500

250000

37500

1500.00%

15.00%

Storeton

51

2

560

1098.04%

28000.00%

Sudbury

5033

250000

100000

1986.89%

40.00%

Sutton Coldfield

8000

1000000

200000

2500.00%

20.00%

Tacolneston

6666

250000

100000

1500.15%

40.00%

The Wrekin

1000

100000

15000

1500.00%

15.00%

Torosay

125

20000

4000

3200.00%

20.00%

Tunbridge Wells

100

10000

4000

4000.00%

40.00%

Waltham

4500

250000

37500

833.33%

15.00%

Wenvoe

5833

500000

75000

1285.79%

15.00%

Whitehawk Hill

367

10000

4000

1089.92%

40.00%

Winter Hill

9166

500000

100000

1090.99%

20.00%



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Comments
Wednesday, 16 March 2011
K
Ken Dalton
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 ???????

link to this comment
Ken Dalton's 1 post GB
Thursday, 17 March 2011
M
Mike Dimmick
sentiment_very_satisfiedPlatinum

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.

link to this comment
Mike Dimmick's 2,486 posts GB
Wednesday, 23 March 2011
T
terry ireson
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

link to this comment
terry ireson's 1 post GB
Wednesday, 30 March 2011
Briantist
sentiment_very_satisfiedOwner

8:49 AM

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.

link to this comment
Briantist's 38,844 posts GB
I
ian, notts
sentiment_satisfiedSilver

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

link to this comment
ian, notts's 253 posts GB
Wednesday, 22 February 2012
C
CHRISTOPHER COE
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

link to this comment
CHRISTOPHER COE's 1 post GB
M
Mike Dimmick
sentiment_very_satisfiedPlatinum

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.

link to this comment
Mike Dimmick's 2,486 posts GB
Saturday, 17 March 2012
G
Grant Buckley
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?

link to this comment
Grant Buckley's 5 posts GB
Dave Lindsay
sentiment_very_satisfiedPlatinum

12:05 PM

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).

link to this comment
Dave Lindsay's 5,724 posts GB
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