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Full Freeview on the Sandy Heath (Central Bedfordshire, England) transmitter

first published this on - UK Free TV
sa_streetviewGoogle Streetviewsa_gmapsGoogle mapsa_bingBing mapsa_gearthGoogle Earthsa_gps52.130,-0.242 or 52°7'47"N 0°14'33"Wsa_postcodeSG19 2NH


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The symbol shows the location of the Sandy Heath (Central Bedfordshire, England) transmitter which serves 920,000 homes. The bright green areas shown where the signal from this transmitter is strong, dark green areas are poorer signals. Those parts shown in yellow may have interference on the same frequency from other masts.

This transmitter has no current reported problems

The BBC and Digital UK report there are no faults or engineering work on the Sandy Heath (Central Bedfordshire, England) transmitter.



List by multiplex|List by channel number|List by channel name|See terrain plot

Which Freeview channels does the Sandy Heath transmitter broadcast?

If you have any kind of Freeview fault, follow this Freeview reset procedure first.

Digital television services are broadcast on a multiplexes (or Mux) where many stations occupy a single broadcast frequency, as shown below.

MuxH/VFrequencyHeightModeWatts
PSB1
BBCA
 H max
C27 (522.0MHz)291mDTG-3180,000W
Channel icons
1 BBC One Cambridge, 2 BBC Two England, 7 BBC Three, 9 BBC Four, 120 CBBC, 121 CBeebies, 130 BBC News, 131 BBC Parliament, 601 BBC Red Button 1, plus 12 others

PSB2
D3+4
 H max
C24 (498.0MHz)291mDTG-3180,000W
Channel icons
3 ITV (Anglia (West micro region)), 4 Channel 4 South ads, 5 Channel 5 Part Network ads, 6 ITV 2, 13 Channel 4 +1 South ads, 14 More 4, 15 Film 4, 28 E4, 33 ITV +1 (Anglia east),

PSB3
BBCB
 H max
C21+ (474.2MHz)291mDTG-6180,000W
Channel icons
45 Film 4 +1, 101 BBC One HD (England no regional news), 102 BBC Two HD (England), 103 ITV HD (ITV Meridian Southampton), 104 Channel 4 HD South ads, 105 BBC Three HD, 123 CBBC HD, plus 1 others

COM4
SDN
 H -0.2dB
C51 (714.0MHz)291mDTG-8170,000W
Channel icons
10 ITV 3, 20 Drama, 26 ITV Be, 27 ITV 2 +1, 30 5*, 31 5USA, 34 ITV 3 +1, 37 Quest, 44 Channel 5 +1, 55 Channel 5 +24, 61 True Entertainment, 62 ITV 4 +1, 66 CBS Reality, 72 ITV Be, 122 CITV, plus 20 others

COM5
ArqA
 H -0.2dB
C52 (722.0MHz)289mDTG-8170,000W
Channel icons
 BBC Red Button 2, 11 pick, 12 Dave, 17 Really, 29 E4 +1, 32 Movie Mix, 41 Food Network, 42 Travel Channel, 46 Challenge, 48 Movies4Men, 68 truTV, 69 truTV +1, 126 Tiny Pop, 132 Sky News, 242 Vintage TV, plus 18 others

COM6
ArqB
 H -0.2dB
C48 (690.0MHz)289mDTG-8170,000W
Channel icons
18 4Music, 19 Yesterday, 21 VIVA, 24 ITV 4, 25 Dave ja vu, 38 Quest +1, 47 4seven, 58 BT Sport 1 (not free), 59 BT Sport 2 (not free), 63 Community Channel, 133 Al Jazeera English, 135 RT English , plus 18 others

com7
 H -5.6dB
C32 (562.0MHz)291mDTG-649,600W
Channel icons
71 Motors TV, 106 BBC Four HD, 107 BBC News HD, 108 Al Jazeera HD, 109 Community Channel HD, 110 Channel 4+1 HD, 111 4seven HD, 124 CBeebies HD, 134 Al Jazeera Arabic, plus 3 others

com8
 H -13.3dB
C34 (578.0MHz)291mDTG-68,400W
Channel icons
starts sometime during 2014/5:



DTG-3 64QAM 8K 2/324.1Mb/s DVB-T MPEG2
DTG-6 256QAM 32KE 2/340.2Mb/s DVB-T2 MPEG4
DTG-8 64QAM 8K 3/427.1Mb/s DVB-T MPEG2
H/V: aerial position (horizontal or vertical)

Which BBC and ITV regional news can I watch from the Sandy Heath transmitter?

regional news image
BBC Look East (West) 1.0m homes 3.7%
from Cambridge CB4 0WZ, 29km east-northeast
to BBC Cambridge region - 4 masts.
70% of BBC East (East) and BBC East (West) is shared output
regional news image
ITV Anglia News 1.0m homes 3.7%
from Norwich NR1 3JG, 119km east-northeast
to ITV Anglia (West) region - 5 masts.
All of lunch, weekend and 80% evening news is shared with Anglia (East)

How will the Sandy Heath (Central Bedfordshire, England) transmission frequencies change over time?

years1965~851984-971997-981998-20112011-132013-182013-18
aerial groupVHFA KKWWWW
C6ITV
C21C4C4C4+BBCB+BBCB+BBCB
C24ITVITVITVD3+4D3+4D3+4
C27BBC2BBC2BBC2BBCABBCABBCA
600C31BBC1BBC1BBC1
C32com7
C34com8
C39C5C5
C40+C
C42-1
C43+A_local_local_local
C45-2
C46+D
C48ArqBArqBArqB
700C51SDNSDNSDN
C52ArqAArqAArqA
800C67B

orange background for multiplexes names more
green background for transmission frequencies
lilac background for power levels in watts
800MHz band: 4G mobile started in 2013
700MHz band: possible 4G in 2019 more
600MHz band: new or moved digital TV services more
Notes: + and - denote 166kHz offset; aerial group are shown as A B C/D E K W
Italics for analogue, digital switchover was Wednesdays 30th March and 13th April 2011.
Click/touch here to read How do the old analogue and currrent digital signal levels compare?Analogue 1-4 1000kWBBCA, D3+
Click/touch here to read Other mapsSandy Heath FreeviewSandy Heath DABSandy Heath AM/FMSandy Heath TV regionBBC Cambridg
Click/touch here to read Which companies have run the Channel 3 services in the Sandy Heath transmitter areaOct 1959-Feb 2
Click/touch here to read Is the transmitter output the same in all directions? Internet Explorer 9+, Firefox, Opera, Chrom

Comments
Sunday, 22 February 2015
D
David Nash
5:48 PM

Yes it's a little odd I agree.
The aerial downfeed goes into the amp, and it has 8 outputs, only one of which is in use although some of the others have cables going to other rooms, but not connected to a receiver. The amplifier is Wolsey, described as "8+1" output. One output (the one I normally use) is marked "Full" and the others are marked 1-8.
This has been the same for >10 years and working properly until now.
With the amp on, the signal is very poor, some channels are detected by the TV but not all, presumably some muxes are not seen although I didn't bother checking which.
With the amp off, and all cables plugged in, signal is fine, all channels detected OK.
With the output from the amp unplugged, ie. just a cable to the TV, there is still a signal. I guess being only 7 miles from the transmitter the cable is picking up the signal itself.
Turning the amp on definitely breaks things.

link to this
David Nash's 5 posts GB
J
jb38
8:02 PM

David Nash: Thanks for the info re: distribution amplifier being used. However, there are two versions of this 8 way+1 amp. (1): being a two input model (334038) with each of the 8 UHF outputs having a gain of 11dB, full output being 18dB, and (2): a 1 input model (334044) with each of the 8 wideband outputs being 13dB, full being 23dB.

Irrespective of which model you have, try connecting the feed that runs to the TV into one of the 8 lower gain outputs rather than being connected into full, as this level of amplification (whether 18 or 23db) being used in a location such as yours is (in normal circumstances) grossly excessive.

Of course, I do appreciate the fact of you having been using this set up for 10 years or so, but something has obviously changed, and which I suspect as not necessarily being connected with your installation, but one never knows!

By the way, Wolsey also manufactures another 8 way+1 distribution amp called an "LTE" model, should by any chance you be using this model ? (albeit I doubt that you would be) disregard that previously mentioned regarding 4G, as the LTE model features built in protection against 4G transmitters.

link to this
jb38's 6,323 posts Platinum Platinum GB
Monday, 23 February 2015
D
David Nash
11:13 PM

Hi again.
It's not the LTE model, as it precedes 4G by a long time.
I did actually try one of the lower gain outputs with no luck.
I guess I will replace the amplifier anyway.

link to this
David Nash's 5 posts GB
Tuesday, 24 February 2015
M
MikeB
8:27 AM

David Nash : why replace it?

You don't seem to need the aerial, so an unpowered splitter might be fine. It would be cheaper and have little that could go wrong, and 4g is certainly not much of a worry.

link to this
MikeB's 1,290 posts Gold Gold GB
J
jb38
7:50 PM

David Nash - If the lower gain output test has made no difference to the situation, then I cant really see any way forward other than by replacing the Wolsey, but though with the replacement distribution amplifier being of the somewhat less powerful variety, as you only require the absolute minimum of gain just enough to compensate for the large number of outputs, whether they be presently used or not.

However, there is one final test that I would like you to carry out, that being, with the amplifier connected up in exactly the same way as it has been over the years but "not" powered up, which as you have said, results in all channels being detected, kill the signal whilst viewing any of the channels by powering up the amplifier.

The test being to remove the amplifiers aerial "input" connector and replace it with a short length of wire (3 or 4 feet) pushed into the middle of the aerial input socket, the question being, does this enable a picture of sorts to be seen? By the way, an old (non powered) set top aerial is ideal for this test if its coax connector is removed.

The reason for requesting this test is that I am beginning to suspect that the problem "might" be caused by instability in the amplifiers high gain input stage, (possibly by an electrolytic capacitor having dried out through age) the instability being triggered by the high level signal from the aerial being fed into the amps input stage, high gain stages being far more vulnerable to developing instability problems should anything be amiss component wise.

Purely out of curiosity, are you using a roof mounted aerial? and can you confirm (or not) that your Wolsey uses "F" sockets rather than coax types?





link to this
jb38's 6,323 posts Platinum Platinum GB
D
David Nash
10:47 PM

I will try that test when I get a chance, thanks for the suggestions.
To answer your other questions, the aerial is in the loft and the amp has the traditional (as I know them!) co-ax sockets, not F-connectors.
Mike: I am splitting to 6 room sockets which all have an outlet, I'd like them all to be usable without poking around under the stairs, although currently only one is in use. Hence an 8-way amp (obviously 6-way would do!).
An 8-way SLX amp is inexpensive on Amazon so I may as well.

link to this
David Nash's 5 posts GB
Wednesday, 25 February 2015
J
jb38
12:23 AM

David Nash: Yes, I would be interested to know the outcome of the "short wire" instead of aerial test, as obviously the signal level being fed into the Wolsey amp from the wire aerial would be a great deal less than from the aerial and I was curious as to whether the amp would still lock up or not, because if it didn't, then an attenuator could be placed in line between the aerial and the amplifiers input.


The undermentioned links are for an SLX 6 way distribution amplifier with built in 4G protection, the second link being for the same amp but with a more detailed specification being given. (by clicking on "specification")


SLx 27823BMG 6 Output Aerial Distribution Amplifier: Amazon.co.uk: TV



Philex Electronic (UK) Ltd. Homepage


link to this
jb38's 6,323 posts Platinum Platinum GB
M
mikey keller
2:58 PM

No tv signal on channel destanation America
???? ...

link to this
mikey keller's 1 post GB
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