London Control transmitter locations

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London Control transmitter locations

Postby shatnersbassoon » Tue Mar 10, 2020 1:01 pm

Hi All,

I live in Wiltshire and now that I've got my airband antenna on the roof, I've noticed that I can hear the ground station for 134.750 very clearly.
I think this is the S23 Bristol CTA for London Control.

Does anyone know where the transmitter might be located?
It must be fairly local to me, but I can't find any reliable sources for transmitter locations.

Matt
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Re: London Control transmitter locations

Postby mhm » Tue Mar 10, 2020 9:28 pm

2 Transmitters hold that frequency
Winstone on pike road
Clee Hill on Dhuteston lane
Whistler TRX1, Uniden 396T, Icom R5,TSC100RA, Yaesu FTA-310
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Re: London Control transmitter locations

Postby Chris P » Tue Mar 10, 2020 9:29 pm

If you know anyone who has a copy of Airwaves which is sadly no longer published there is a map of Transmitter sites , Mine is packed away due to a pending house move so I am unable to make a copy of the relevant map at the moment
Regards Chris aka G8FFF nipper or tazmin88
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Re: London Control transmitter locations

Postby shatnersbassoon » Tue Mar 10, 2020 9:41 pm

Thanks for that.

I'm in Calne, so I guess it's most likely the Winstone one I pick up.
The HeyWhatsThat website shows a couple of hills in the way, but the transmission is very clear.
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Re: London Control transmitter locations

Postby mhm » Tue Mar 10, 2020 10:37 pm

shatnersbassoon wrote:Thanks for that.

I'm in Calne, so I guess it's most likely the Winstone one I pick up.
The HeyWhatsThat website shows a couple of hills in the way, but the transmission is very clear.


These were on winstone have not updated it for a while
118.8250
119.7750
124.7500
126.0800
128.4800
128.8150
129.2050
129.3800
130.9250
131.1300
132.1500
132.1650
132.4550
132.6050
132.8400
132.8600
133.6000
134.4600
134.7500
135.1500
135.2550
278.6000
Whistler TRX1, Uniden 396T, Icom R5,TSC100RA, Yaesu FTA-310
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Re: London Control transmitter locations

Postby shatnersbassoon » Tue Mar 10, 2020 11:00 pm

mhm wrote:These were on winstone have not updated it for a while
118.8250
119.7750
124.7500
126.0800
128.4800
128.8150
129.2050
129.3800
130.9250
131.1300
132.1500
132.1650
132.4550
132.6050
132.8400
132.8600
133.6000
134.4600
134.7500
135.1500
135.2550
278.6000



Excellent, I'll monitor those and see if I can hear the ground station.
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Re: London Control transmitter locations

Postby rozbiff » Wed Mar 11, 2020 12:13 pm

shatnersbassoon wrote:It must be fairly local to me, but I can't find any reliable sources for transmitter locations.


Airlines and pilots use the AIP - is that not reliable enough for you?

I've posted details of the site locations on here before - as have others. User Minus1 often posts very precise details of his findings. (admittedly, the search functionality of this bulletin board is pants and you are better off searching it using your favourite web crawler)

Here's a rough guide to the locations:
http://img4.imagetitan.com/img.php?imag ... d01873.jpg
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Re: London Control transmitter locations

Postby shatnersbassoon » Wed Mar 11, 2020 12:30 pm

rozbiff wrote:
shatnersbassoon wrote:It must be fairly local to me, but I can't find any reliable sources for transmitter locations.


Airlines and pilots use the AIP - is that not reliable enough for you?

I've posted details of the site locations on here before - as have others. User Minus1 often posts very precise details of his findings. (admittedly, the search functionality of this bulletin board is pants and you are better off searching it using your favourite web crawler)

Here's a rough guide to the locations:
http://img4.imagetitan.com/img.php?imag ... d01873.jpg



I am somewhat familiar with the AIP (I hold a microlight pilot license), but couldn't find any physical locations for the transmitters for a given frequency.
Some frequencies (134.750) I can hear the ground station clearly, while others not at all, and I was trying to work out why this one was much clearer than the others.

Thanks for the map
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Re: London Control transmitter locations

Postby Minus1 » Thu Mar 12, 2020 12:51 am

rozbiff wrote:Here's a rough guide to the locations:
http://img4.imagetitan.com/img.php?imag ... d01873.jpg


That's a good guide.

AIP does not have transmitter site details that I've ever found.

There was a NATS document about Wind Farms (potential interference to radio comms) which showed all the sites a few years ago.

Where two mast symbols are very close together, one is the transmitter, the other is the receiver. (e.g. Kelsall, Preston, Chedburgh, Waltham-on-the-Wolds (NATS call it 'Grantham') - receiver mast at Stewstern, Davidstow Moor )
The two at Rothwell in Lincs, and Davidstow Moor in Cornwall, are very close together (About 3 km)
You can usually track them down precisely using transmitter symbols on OS maps and Google Streetview.
Once you know what one ATC mast looks like…

Never found at transmissions found at Ru Stafnish in Kyntyre, so may be just a receiver. Needs a long walk into the forest to be sure though as it is too far from the road for Close Call.
I think the one in North Devon is just the Burrington radar dome.
Only found RAF Valley comms on Anglesey. (Snaefell is within range for ATC.)

The Northumbria site near Alnmouth seemed defunct for VHF a few years ago, ATC signals came all the way from Craigowl Hill near Dundee, or Great Dun Fell.
The Alnmouth site is still used for UHF (GCI). Big dark green tubes being a dead giveaway!

The mast shown in the sea north of Tyree is actually on Tiree. :biggrin:

Remember to check for +/- 5 kHz offsets when a freq is transmitted by 2 sites, and 0 & +/- 7.5 kHz offsets when a freq is transmitted by 3 sites.

I've not been able to find a definitive list of the VHF sites in Ireland, though radar locations may offer a clue. There is an IAA site on Mount Gabriel in Co Cork.
I reserve the right to ignore people who have made no attempt to the read the manual, and expect others to do it for them.
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Re: London Control transmitter locations

Postby shatnersbassoon » Thu Mar 12, 2020 10:40 am

Great information, thanks Minus1. I hadn't though of looking on the OS maps.
I suppose the best way of finding out what each transmitter is broadcasting is to camp out nearby and have a listen.

I'm making an assumption that the Winstone transmitter is the one I can hear. The others look to be further away.
Do you happen to know if the transmitters are slightly directional or use a different power depending on the area they might be providing a service to?

For example, I can hear 134.750(Cotswold/Brecon) clear as a bell, I can also hear another ground station on 135.??? I can't remember the exact freq and I think this is bandboxed? with 134.750 as it's sometimes the same transmission, but it's not quite as clear most of the time.
Assuming they are sent by the same transmitter, should the transmitting signal be of the same strength?

None of this makes much difference, but it's interesting to know where these transmission originate.

Cheers, Matt
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