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Old 18-08-2016, 17:09   #1
G4TMV
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Special DRM Transmission from Ascension Island 21715 kHz

Hi All,

The latest DRM Newsletter is just out, and shows details of a special broadcast from Ascension Island on Sunday 28th of August at 1155 GMT:


DRM will be part of a big anniversary on a small island in the Atlantic Ocean. On 28th of August at 1155 GMT Babcock International will ensure a special BBC digital transmission on 21715 kHz from the BBC Atlantic Relay station, marking the fiftieth anniversary of the BBC’s first short-wave radio broadcast from Ascension Island.

Since 1966, the Atlantic Relay station has broadcast BBC World Service programmes to Africa and South America, and to this day, continues to broadcast over 250 programme hours every week to East and West Africa in English, French, Hausa and Somali.

The two hour-transmission on 21715 kHz will start with the old, special sound of Bow Church Bell in east London, the sound of which, even if in DRM this time, will remind older listeners of the BBC broadcasts of many decades ago. The 21-hour transmission will be the regular BBC programmes for West and South Africa and will end at 1400.

DRM – Digital Radio Mondiale, is an international digital radio standard designed by broadcasters, for broadcasters, in co-operation with transmitter and receiver manufacturers. DRM is a high quality digital replacement for analogue radio broadcasting in the AM and FM bands.

This special transmission will be sent with greetings from Ascension Island’s BBC and Babcock International staff and visitors, who will be celebrating half a century of sterling broadcasting on August 28th.
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Old 19-08-2016, 09:30   #2
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Hi Alan,

I was just reading the DRM Newsletter myself and I wonder what the target area would be. Most of BBC's transmissions from ASC are directed to southern Africa. Previous experience from Ascension Island were difficult to receive in Switzerland (where I lived then). Any information about the target area for this DRM transmission?

Playing around with VOAAREA suggests that Brazil would be quite a good location from the back of the beam.
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Last edited by Digger : 19-08-2016 at 09:52.
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Old 19-08-2016, 15:25   #3
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Smile

Quote:
Originally Posted by Digger
Hi Alan,

I was just reading the DRM Newsletter myself and I wonder what the target area would be. Most of BBC's transmissions from ASC are directed to southern Africa. Previous experience from Ascension Island were difficult to receive in Switzerland (where I lived then). Any information about the target area for this DRM transmission?

Playing around with VOAAREA suggests that Brazil would be quite a good location from the back of the beam.


Hi Digger, They seem to be using the African programmes for it, so I suspect they will just be beaming south. Depending on the MUF at that time it is possible we could hear something via the long path, but considering just how bad this latest solar cycle has been I wouldn't place any money on that happening. If it had been held after the Equinox our chances would have been greatly improved I think.

It should at least offer a good chance for our Brazilian members to hear them and let us know what we are missing. :-)
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Old 20-08-2016, 16:16   #4
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Aug_20

During the 10th Southern African Development Community Digital Broadcasting Migration Forum, which took place Dec 2–3/2015 in Dar es Salaam, Tanzania, BBC made a live DRM transmission relayed by Babcock via transmitters on Ascension Island (on 17830kHz ) across the continent to the other coast of Africa in Dar Es Salam, Tanzania.

I received this transmission and below are the log and the label.

Unfortunately this post have been lost due to the known site breakdown.
Attached Images
File Type: png 17830_20151203_mitajohn_lbl.png (7.1 KB, 148 views)
File Type: png 17830-151203-0901-1001-mitajohn.png (39.7 KB, 149 views)
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Old 20-08-2016, 18:01   #5
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... something I missed completely...
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Old 22-08-2016, 22:24   #6
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We look forward to broadcast here in Brazil. I hope you have these various services that you can capture on 3955 and 17790 kHz, such as the Journaline and maybe some images too, who knows (listening with Uniwave). 73!
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Old 25-08-2016, 04:15   #7
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DRM part of the Ascension Island 50th Anniversary – DRM for Africa and now for BRAZIL too!

Special DRM transmission for Africa and Brazil from Ascension Island on its 50th anniversary – Sunday 28th August 2016

DRM will be part of a big anniversary on a small island in the Atlantic Ocean. On 28th of August at 1155 GMT. Babcock International will ensure a special BBC digital transmission from the BBC Atlantic Relay station, marking the fiftieth anniversary of the BBC’s first short-wave radio broadcast from Ascension Island.

The first 2-hour transmission will be the regular BBC programmes for West and South Africa and will end at 1400.From 1400-1430 another DRM transmission ( BBC English) will be aimed at South America/Brazil !

This special transmission will be sent with greetings from Ascension Island’s BBC and Babcock International staff and visitors, who will be celebrating half a century of sterling broadcasting on August 28th.

To confirm details of Sunday’s DRM transmission from Ascension, as follows:

FREQ TIME (UTC) SERVICE TX kW Bearing Day LANG TARGET

21715 1155-1201 BBC DRM ASC 250 114 1 English SOUTH AFRICA (Special Announcement)
21715 1201-1400 BBC DRM ASC 250 114 1 English SOUTH AFRICA (English)
21715 1400-1430 BBC DRM ASC 250 250 1 English BRAZIL (English)

Related :

http://babcock.media/latest/010816/

(Ruxandra Obreja, Digital Radio Mondiale Consortium)
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Old 28-08-2016, 12:49   #8
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Aug_28

I received a very weak signal with some fragments of audio. Attached is a log and the IPSD.
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File Type: png 21715_160828_1157_mitajohn_sm.png (36.3 KB, 124 views)
File Type: png 21717_20160828_mitajohn_IPSD.png (23.1 KB, 164 views)
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Old 28-08-2016, 12:52   #9
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Aug_28

A more detailed log for 40 mins, 5.5% CDA / 17.3dB max SNR.
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File Type: png 21715-160828-1157-1237-mitajohn.png (36.8 KB, 108 views)
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Old 28-08-2016, 12:56   #10
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All I got so far was an almost label...

@John: The ASC is in the latest TX Sites on my web page or just update from the DRM-Log Plotter!
Attached Images
File Type: jpg 21715@1205utc.jpg (22.5 KB, 115 views)
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Last edited by Digger : 28-08-2016 at 13:23.
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Old 28-08-2016, 13:40   #11
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I have just also briefly received the ID label!
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Old 28-08-2016, 14:05   #12
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Here in eastern Newfoundland, I have been tuned since before 1200 UTC and have seen not a sign of it. I had hoped that there might be a difference after 1400, but it is 1405 now and there is still none.

I have also been listening on the Satellit 750 (in AM) for the telltale DRM whoosh and hear none of it either.

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Old 28-08-2016, 14:22   #13
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Aug_28_2nd

Another log a bit more audio from this transmission. 13.2% CDA / 20.4dB max SNR.
Attached Images
File Type: png 21715-160828-1256-1410-mitajohn.png (38.1 KB, 121 views)
File Type: png 21715_160828_1256_mitajohn.png (28.4 KB, 108 views)
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Old 28-08-2016, 14:27   #14
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Aug_28_3rd

And some recorded sounds from this transmission...
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File Type: zip DreamOut21715_mitajohn_20160828.zip (51.8 KB, 116 views)
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Old 28-08-2016, 14:30   #15
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Just a few snatches of audio here, and a label. I was surprised to hear anything at all though as the MUF was quite low at that time, pity it wasn't in September or October, it would have been much higher then. Highest SNR I got was about 11.6db, and when there was audio it sounded very good.
Attached Images
File Type: jpg Image2.jpg (82.1 KB, 123 views)
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Alan.

Modified NRD-525G with
Radiokit DRM Decoder Board,
SDRplay RSP-1A,
Airspy HF+ Discovery
SDR Console v3

Lancashire, UK
53:39.18N 02:10.28W
IO83vp

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