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* Program No NWS41 (ENGPU_WAVE_20091206)
* Production Date Tuesday December 1, 2009
* Uploaded Date By - EST Wednesday December 2, 2009 7:00 pm EST
UTC Thursday December 3, 2009 0000 UTC
Singapore morning, Thursday December 3, 2009
* Broadcast Date Sunday December 6, 2009
* Contents 1. American Radio Stations in Australia
2. Identification Signal
3. Usage of Callsigns - Mixed Numbers & Letters
4. National Anthem
5. DX Report from Japan
6. Music of the World
* Research & Script Dr. Adrian M. Peterson, Indianapolis, Indiana USA
* Recording Studios of WRMI, Radio Miami International, Miami, Florida USA
* Distribution AWR Network
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Wavescan NWS41
* Theme - 00:00
"Birthday Waltz" with Willi Glahe
* Opening Announcement - 00:16
Welcome to "Wavescan", DX program from Adventist World Radio
Researched and written in Indianapolis, produced in studios of WRMI
Program outline
1. American Radio Stations in Australia
2. Usage of Callsigns - Mixed Numbers & Letters
3. DX Report from Japan
* American Radio Stations in Australia - 00:50
Some time ago, we presented the story of the American shortwave station in Australia that was established under General Douglas McArthur for communication with American units in the Pacific and in the continental United States. This shortwave transmitter facility was established at Hemmant, which is an outer suburb of Brisbane in Queensland, and it was on the air for a period of three or more years with the usage of several units, including a 10 kW Federal transmitter and a 40 kW Press Wireless transmitter. The shortwave receiver station was located half a dozen miles distant, in another outer suburb, Capalaba.
It is true that this double station was established primarily for armed forces communication purposes during the latter half of World War 2. However, there were many occasions when it was in use for the forwarding of news information to the United States, and even voice reports for re-broadcast by the mediumwave networks in the United States.
Since the researching and writing of this topic, we have discovered that there was a whole network of at least ten of these American communication stations in Australia, beginning in the year 1942. These stations were used mainly for teletype transmissions, as well as for communications in high speed Morse Code.
The very first of these American radio stations in Australia was installed in a suburb of Melbourne, the capital of the south eastern state of Victoria. This unit became operational on March 10, 1942, just two weeks before General MacArthur arrived in the city by train. The Melbourne station was a joint operation between American and Australian personnel, and under MacArthur, it was in service under the American callsign WTJJ.
This Melbourne station, WTJJ, received messages from the Philippines and elsewhere via WVJK in Darwin and forwarded them on to the United States via the army station WTJ in Hawaii. In view of the long range transmission from WTJJ Melbourne, we would presume that this transmitter was rated at least at 10 kW, and probably more likely at 40 kW.
It was around this time that another temporary station was installed, this time in a railway train, for use in various areas of eastern Australia. The train facility was made up of teletype transmitters, probably three of them, rated at 3 kW and manufactured by Hallicrafters for use in airplanes.
Another one of these stations was installed in Sydney, New South Wales and this was on the air under the American army callsign, WVJM. This station communicated with American army communication stations located in Melbourne, Brisbane and Townsville.
In the north eastern state of Queensland, three more of these American radio stations were established for communications within Australia and beyond. These stations were located in Brisbane and Townsville.
Initially, the first Brisbane station was installed temporarily in a tent on the Redlands Bay Golf Course, some distance north of Brisbane itself. A substantial building was quickly erected and it housed a 10 kW Federal transmitter with 5 rhombic antennas nearly one hundred feet tall.
Another temporary station with a 1 kW Federal transmitter was installed in the girl's high school at Somerville House Brisbane for communication with Sydney and Townsville. The two temporary stations in Brisbane, Redlands Golf Course and Somerville House, were closed in February 1943 when the more substantial facilities at Hemmant and Capalaba were inaugurated.
The American communication station WVJL in Townsville in northern Queensland, was located adjacent to the Coastal Radio Station, which housed the transmitters for the AWA maritime station VIT and the local mediumwave broadcast station 4TO. During this era, VIT-4TO communicated with VIG Port Moresby as part of the wartime Coast Watch service. The Port Moresby transmitter was the old mediumwave unit, 4PM, which had been converted for shortwave telegraphy usage.
In the Northern Territory, there were two American shortwave communication stations, one near Darwin itself right on the north coast, and the other at Adelaide River, 75 miles inland. The Darwin station was identified as WVJK, and the inland station as KAZ. The inland station initially handled all American traffic from the Philippines, and in 1944 it was transferred to Hollandia in Dutch New Guinea; but that's another story for another time.
Suffice it to say that each of these ten known American communication radio stations handled communication traffic, as well as at times, media messages for broadcast and publication. The stronger stations, and in particular the 40 kW unit on the edge of suburban Brisbane, also carried voice messages for relay on mediumwave throughout the United States.
* Identification Signal - 06:22
Italy RAI - Interval Signal, Bird Chirps
Bells Melody, theme
Announcement in Italian
* Program Announcement - 08:31
Allen Graham
* Usage of Callsigns - Mixed Numbers & Letters - 09:21
What is the origin for the system of radio station callsigns that are in use throughout the world to this day? How come some stations are identified with just alphabetic letters only? And other stations are identified with both numbers and letters?
Way back 150 years ago, in the early days of telegraphy by Morse Code, the operators at each station that was connected by telegraph wire used a simple abbreviation to identify the sending station, rather than laboriously spelling out the location name. The usage of many abbreviations enabled the operators to send their messages more quickly.
Some 50 years later, when wireless stations were erected for the transmission of messages by Morse Code, the same procedures were followed; that is, the usage of as many abbreviations as possible, including an abbreviation for the sending location. Some abbreviations for the locations of very early wireless stations were quite logical, such as for example:-
CC Cape Cod Massachusetts USA
FL Eiffel Tower Paris France
SF San Francisco California USA
GB Glace Bay Nova Scotia Canada
However, due to the number of wireless stations proliferating throughout the world, most of the abbreviations in use for the locations of wireless stations bore no resemblance to the actual location. For example:-
EX Los Angeles California USA
SN Cordova Alaska
UA Nantes France
DF Santa Barbara California USA
Another DF Vancouver British Columbia Canada
In an endeavor to regulate this confusing system of random choices, an international wireless convention was held in Berlin in 1906. This was the second international convention in Berlin that addressed the need for the regularization of the newly developing wireless scene that began with the work of the famous Italian, Guglielmo Marconi.
At this 1906 wireless convention, a system of alphabetic designations was allocated for all countries throughout the world. For example, transmitter callsigns beginning with:-
G were allocated to England
V British countries
F France & French colonies
I Italy
J Japan
K N W USA
There was a third international wireless convention held in London, England on April 23, 1913. Even though this event was staged mainly to address the wireless scene in Europe, yet delegates from the United States also attended and participated.
One of the important matters looked at on this occasion was the identification of amateur and experimental wireless stations which were beginning to proliferate in many countries. However, because the coverage area from these lower powered operations was considered to be quite local, it was decided to implement a different system of identification.
Their decision was to introduce a system of numbers and letters, with the initial number indicating the geographic location. Single numbers were chosen for each of the participating countries in Europe, as follows:-
Luxembourg 1
United Kingdom 2 5 & 6
Germany 4
Denmark 7
France 8
Holland 0
The major determining factor at the 1913 convention was that the initial digit number in a callsign indicated a specific geographic area. At this stage in Europe, the initial number indicated a specific country.
Likewise, when the American delegates returned home, the government authorities decided to implement a similar system in the United States using the numbers 1 through 9, with each number indicating a specific cluster of states. North of the border, up there in Canada, they soon implemented a similar system, with the initial digit number indicating usually an individual province.
This same numeric scheme was also implemented in the South Pacific. Australia chose the numbers 2 through 9, indicating each separate state, as well as nearby Papua & New Guinea. New Zealand chose the numbers 1 through 4, indicating major geographic areas in the twin island country, beginning with 1 at the top of the North Island and ending with 4 at the bottom of the South Island.
When radio broadcasting was introduced into England, this same numeric system was implemented according to the action taken at the Third International Convention in London in 1913. Their first radio broadcasting station was 2MT Writtle, a Marconi experimental station launched out north east from London in February 1922; and next on the list came 2LO London, three months later.
However, in the list of the 22 introductory radio broadcasting stations in England from 1922 to 1925, there seems to be little apparent logic in the choice of the initial digit number, whether it was 2 or 5 or 6. Likewise, there was little apparent logic in the two letters of the alphabet that made up the remainder of the callsign.
Obvious callsigns in Great Britain during this era were 2BE Belfast in Northern Ireland; 5WA in Wales, at Cardiff; and 6ST in Stoke-on-Trent. However, in view of the fact that so many of the other callsigns in England during this early era seem to be almost a random selection, it would seem therefore that calls were chosen that were not already taken up by amateur radio operators.
Even to this day, all amateur radio stations throughout the world are identified according to a mixture of letters and numbers. The initial alphabetic digits indicate the country, and the following numeric digits usually indicate regions within that country.
Likewise with the countries that have retained a similar system for the callsigns of radio broadcasting stations. In Australia, the initial number indicates the state, and the following two letters identify the station, and quite often, also the location. For example:-
2BH is located in Broken Hill New South Wales,
4TI Thursday Island Queensland
6XM Exmouth Western Australia
8AL Alice Springs Northern Territory
Next week here in Wavescan, we will take a further look at the interesting story regarding the usage of radio callsigns throughout the world; and on this next occasion, it will be the interesting story of shortwave callsigns.
* National Anthem - 16:29
Italy - Brass Band
* DX Report from Japan - 18:29
Yokiko Tsuji
* Music of the World - 23:32
Israel - Instrumental & vocal
* Closing Announcement - 24:07
Thanks for listening to "Wavescan", weekly DX program from Adventist World Radio
Researched and written in Indianapolis
Next week
1. Return to Pitcairn Island
2. Usage of Callsigns - Shortwave
3. DX Report from the Philippines
Wavescan address
Box 29235
Indianapolis
Indiana 46229 USA
Wavescan @ AWR.org
Jeff White, WRMI
* Music Outrun - 25:15
* Program End - 28:55
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1. American Radio Stations in Australia
Integrated Chronology
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Year Date Call Event Reference
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1942 Mar 10 WTJJ WTJ Hawaii opened manual CW to RAAF Melbourne, became US HQ Home.st
1942 Established at Moorabbin, Melbourne, Australian & US Navy DXC 11-97 1
1942 Mar 22 MacArthur arrived in Melbourne Internet
1942 Apr 18 MacArthur appointed Commander-in-Chief Allied Forces Home.st.net.au
1942 Railway Train, Gen MacArthur's HQ, 3 kW Hallicrafters BC610-HT4, aircraft style
1942 May 6 Surrender of Corregidor Internet
194x KAZ Adelaide River handled all American radio traffic to and from the Philippines
1942 May Early US military took over Redlands Bay Golf Course after May 2 Sandgate
1942 1 kW Federal transmitter set up in tent, Redlands Golf Course
1942 May WTJJ (RAAF) operated by US Army Signal Corp, MacArthur HQ Melbourne Home.st
1942 May WVJL Already on air, operated by US Army Signal Corp Townsville Home.st.net.au
1942 May WVJM Already on air, Sydney, operated by US Army Signal Corp Home.st.net.au
1942 Large transmitter building Redlands Bay Golf Course, 5 rhombics
1942 10 kW transmitter amplifier from USA installed Redlands Bay Golf Course Home
1942 May Already on air WVJK Darwin, operated by US Army Signal Corp Home.st.net.au
1942 Jun 18 US radio company arrived Brisbane for Somerville House Home.st.net.au
1942 Jun Established 1 kW Federal transmitter Somerville for Sydney & Townsville
1942 Jul 20 MacArthur established HQ in Brisbane, AMP Building Internet
1942 Late Redlands, circuit established with WVLQ Port Moresby Home.st.net.au
1943 Feb Redlands Bay station closed in favor of Hemmant Home.st.net.au
1943 Feb Hemmant transmitter station established 180 Youngs Rd Home.st.net.au
1943 1 kW Federal, 10 kW Colonial amplifier, 100ft high rhombics, Hemmant
1943 Hemmant 40 kW PW SSB transmitter installed 999th Signal Co Tegeler
1943 Capalaba established by US Army Signal Corps at Cotton's Farm Home.st
1944 Nov 21 KAZ moved from Adelaide River to Hollandia New Guinea
1944 KAZ moved from Hollandia to Leyte after Philippine landings
194x KAZ Hollandia closed in September (1944?)
1946 Aug 20 Capalaba taken over by PMG, receiver station & monitoring Home.st.net.au
1946 Aug 26 Hemmant station taken over by PMG as Radio Station Home.st.net.au
1950s-1960s New building erected Capalaba for aircraft communication Home.st.net.au
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2. American Radio Stations in Australia
Radio Chronology - Eastern Australia
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Year Date Call Event Reference
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Railway Train
1942 Gen MacArthur's HQ, 3 kW Hallicrafters BC610-HT4, aircraft style RN 1-46 94 R&H ==============================================================================
3. American Radio Stations in Australia
Radio Chronology - Victoria
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Year Date Call Event Reference
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Melbourne, WTJJ
1942 Mar 10 WTJ Hawaii opened manual CW to RAAF Melbourne, became US HQ Home.st
1942 Mar Mid Traffic flow began Corregidor WVDM-WVJK-WTJJ-WTJ-DC Home.st.net.au
1942 Mar 22 MacArthur arrived in Melbourne Internet
1942 Mar MacArthur commandeered Trustees Building 401 Collins St, Melbourne Home.st
1942 Mar MacArthur's real HQ, Melbourne Boys' High School, tunnel to Yarra Home.st.net
1942 Apr 18 MacArthur appointed Commander-in-Chief Allied Forces Home.st.net.au
1942 May 6 Surrender of Corregidor Internet
1942 May WTJJ (RAAF) operated by US Army Signal Corp, MacArthur HQ Home.st.net.au
1942 Part of ACAN, American Army Command & Administrative Network Home.st.net
1942 Established at Moorabbin, Melbourne, Australian & US Navy DXC 11-97 1
1942 Jul 20 Established AMP HQ in Brisbane Internet
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4. American Radio Stations in Australia
Radio Chronology - New South Wales
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Year Date Call Event Reference
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Sydney, WVJM
1942 May WVJM Operated by US Army Signal Corp Home.st.net.au
Part of ACAN, American Army Command & Administrative Network Home.st.net
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5. American Radio Stations in Australia
Radio Chronology - Northern Territory
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Year Date Call Event Reference
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Darwin, WVJK
1942 May WVJK Operated by US Army Signal Corp Home.st.net.au
Part of ACAN, American Army Command & Administrative Network Home.st.net
Adelaide River, KAZ
194x KAZ Handled all American radio traffic to and from the Philippines
1944 Nov 21 Moved to Hollandia New Guinea
1944 Moved to Leyte after Philippine landings
194x Closed in September (1944?)
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6. American Radio Stations in Australia
Radio Chronology - Queensland
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Year Date Call Event Reference
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Redlands Bay, Brisbane
1942 May US military took over after May 2 Sandgate
1942 Operated by US Army Signal Corp Home.st.net.au
Part of ACAN, American Army Command & Administrative Network Home.st.net
1942 Jul 20 MacArthur HQ established in AMP Building Internet
1942 Brisbane, terminal for Melbourne, Sydney, Townsville Darwin circuits Sandgate
194x MacArthur issued news releases to news correspondents PP 91
1942 10 kW transmitter amplifier from USA installed Home.st.net.au
1942 Transmitting station established, staff of 10 ACAN personnel Sandgate.net
1 kW Federal set up in tent, Redlands Golf Course
Large transmitter building, 5 rhombics, poles 20 - 30 metres high
Civilian guards on horseback
1942 Late Circuit established with WVLQ Port Moresby Home.st.net.au
1943 Feb Redlands Bay station closed in favor of Hemmant Home.st.net.au
Somerville House, Brisbane
1942 Jun 18 US radio company arrived Brisbane Home.st.net.au
1942 Jun Established 1 kW Federal transmitter Sydney, TG5 Townsville Home.st.net.au
Townsville, WVJL
1942 May WVJL Operated by US Army Signal Corp Home.st.net.au
Part of ACAN, American Army Command & Administrative Network Home.st.net
Hemmant, Brisbane: Transmitter Station
1942 Jul 20 MacArthur HQ established AMP Building Brisbane, com centre basement Internet
1942 Brisbane, terminal for Melbourne, Sydney, Townsville Darwin circuits Sandgate
1943 Feb Hemmant transmitter station established 180 Youngs Rd Home.st.net.au
T shaped building, PW shifter, 1 kW Federal, 10 kW Colonial amplifier
Separate 250 kW generator, 100ft high rhombics
40 kW PW SSB transmitter installed 999th Signal Co Tegeler Document 2
1943 Redlands Bay station closed in favor of Hemmant Home.st.net.au
1945 Jul 20 Copy of official pass to work at Hemmant station Home.st.net.au
1946 Aug 26 Station taken over by PMG as Radio Station Home.st.net.au
Capalaba, Brisbane: Receiver Station
1943 Established by US Army Signal Corps at Cotton's Farm Home.st.net.au
5 or 6 miles from Hemmant; Tingalpa, Uhlman, Old Celveland
Wilcox receiver, teletype, emergency generator
Landline to AMP Building
1946 Aug 20 Taken over by PMG, receiver station & monitoring Home.st.net.au
1950s-1960s New building erected for aircraft communication Home.st.net.au
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7. The Usage of Radio Callsigns
International Radio Regulations
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Year Date Event Reference
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1904 Feb 1st Wireless Telegraphy Convention, Berlin
1906 Nov 3 2nd Berlin Wireless Telegraphy Convention
1908 Jul Decisions of Berlin Convention implemented
1912 Jun 4 3rd International Telegraphic Conference, London
1913 Apr 23 London International Telegraphic Conference implemented
Luxembourg 1, United Kingdom 2 5 & 6, Germany 4, France 8, Denmark 7, Holland 0
1929 Dec 10 Till Jan 5, Washington Conference, ITU requirement, all countries add national prefix
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8. The Usage of Radio Callsigns
United States of America
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Year Date Event Reference
----------------------------------------------------------------------------------------------------------------------------------------- 1906 Nov 3 Berlin Wireless Telegraphy Convention
1907 Dept of Navy printed document International Wireless Telegraph Convention
1908 Jul Decisions of Berlin Convention implemented in USA
1912 Jun 4 International Telegraphic Conference, London (USA as participant)
1913 Apr 23 London International Telegraphic Conference (implemented?)
Luxembourg 1, United Kingdom 2 5 & 6, Germany 4, France 8, Denmark 7 Holland 0
1913 9 radio districts, 2 letters; 1AW, 6OI, etc, these are local not international stations
1922 4 letter callsigns broadcast stations, K & W, E border, NM, CO, WY, MT Astrosurf
1923 Jan Border line moved to Mississippi River Astrosurf
1927 NU N = North America, U = United States
1928 Oct 1 W or K added as prefix
1929 Dec 10 Till Jan 5, Washington Conference, ITU requirement, all countries add national prefix
USA received A, N, part K, W
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9. The Usage of Radio Callsigns
Europe
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Year Date Event Reference
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1906 Nov 3 2nd Berlin Wireless Telegraphy Convention
1908 Jul Decisions of Berlin Convention implemented
1913 Apr 23 London International Telegraphic Conference
Luxembourg 1, United Kingdom 2 5 & 6, Germany 4, France 8, Denmark 7 Holland 0
1929 Dec 10 Till Jan 5, Washington Conference, ITU requirement, all countries add national prefix
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10. The Usage of Radio Callsigns
Australia
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Year Date Event References: HOARCS
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1901 PMG Department organized at time of Federation
1905 Oct Wireless telegraphy Act; placed control of wireless under PMG
1905 Nov 1st license issued to H. G. Robertson
1906 Marconi Co NZ obtained license for tests between Victoria & Tasmania
1910 Australian Wireless Co license for ATY
1910 Apr Wireless Institute of Australia formed
1910 Mid PMG issued experimental licenses, three letters, XAA and onwards
1911 License for new station AAA
1912 Pennant Hills POS & Applecross POP inaugurated
1912 International convention, V honoring Queen Victoria
1912 Aug NSW XAA-XIZ, Vic XJA-XPZ, Q XQA-XUZ, SA XVA-XXZ, WA XYA-XYZ, Tas XZA-XZZ
1914 Jul NSW X2AA, Vic X3AA, Q X4AA, SA X5AA, WA X6AA, Tas X7AA
1914 Aug All experimental stations closed, except Perth WC listen only, Fisk transmit & listen
1916 Nov Navy took control all wireless stations
1919 Jun Navy issued a few permits to listen, ½ dozen to transmit
1919 Jun New system, state initial & license number; eg V237, Q238
1920 Sep Wireless Telegraphy Act, Director Radio Telegraphy, Prime Minister's Dept. Melbourne
1921 Early New director took over from navy, pre-war calls re-implemented, X2AA, X3AA, etc
1922 Oct Some licenses issued in anticipation of new regulations
1922 Nov 3 Transfer to PMG Dept. XA2AA, XA3AA, etc; X = experimental, A = Australia
1922 Dec 1 Official date for implementation of new regulations
1922 Broadcasting licenses also permitted
1923 May Broadcasting Conference
1923 Aug Implementation of new Broadcast Listener's Licence
1924 Jul New PMG regulations implemented, due to 2nd Broadcast Conference
1927 Feb 1 Amateur callsign prefix, OA; O = Oceania, A = Australia
1928 Dec 8 VK calls could be used beginning this date
1928 Dec 31 Midnight, official change to VK calls
1939 Aug 31 Thursday, amateur licenses withdrawn
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11. The Usage of Radio Callsigns
Early Mediumwave Broadcasting Stations in the British Isles
According to Callsign
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Station Location Year Date kHz Service Information Area
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2BD Aberdeen 1923 Oct 10 605 Main station Scotland
2BE Belfast 1924 Oct 24 682 Main station Ireland
2DE Dundee 1924 Nov 12 906 Relay station Scotland
2EH Edinburgh 1924 May 1 914 Relay station Scotland
2LO London 1922 May 11 825 Main station Marconi House South
2LO London 1925 Apr 66 825 Main station Selfridges Store South
2LS Leeds 1924 Jul 8 866 Relay station North
2LS Bradford 1924 Jul 8 968 Relay station Relay from Leeds North
2MT Writtle 1922 Feb 14 430 Marconi Co West
2ZY Manchester 1922 May 16 793 Main station North
5IT Birmingham 1922 Nov 15 629 Main station Central
5NG Nottingham 1924 Sep 16 920 Relay station Central
5NO Newcastle 1922 Dec 24 742 Main station North
5PY Plymouth 1924 Mar 28 887 Relay station Cornwall
5SC Glasgow 1923 Mar 6 717 Main station Scotland
5SX Swansea 1924 Dec 12 622 Relay station Wales
5WA Cardiff 1923 Feb 13 850 Main station Wales
6BM Bournemouth 1923 Oct 17 775 Main station South
6FL Sheffield 1923 Nov 16 980 Relay station North
6KH Hull 1924 Aug 15 844 Relay station North
6LV Liverpool 1924 Jun 11 943 Relay station North
6ST Stoke/Trent 1924 Oct 21 996 Relay station Central
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12. The Usage of Radio Callsigns
Early European QSL Cards - Number System
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Station Country City Year Date Type
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2NM England Caterham 1924 Dec 6 Original
5LB England Lancaster 1925 Apr 1 Original
6BD England Eastbourne 1925 Dec 28 Original
8EN France Marseille 1923 Jul 22 Original
0CZ Holland Utrecht 192x Oct 21 Original
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13. The Usage of Radio Callsigns
Early Mediumwave Broadcasting Stations in the British Isles
According to Area
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Station Location Year Date kHz Service Information Area
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2BD Aberdeen 1923 Oct 10 605 Main station Scotland
2DE Dundee 1924 Nov 12 906 Relay station Scotland
2EH Edinburgh 1924 May 1 914 Relay station Scotland
5SC Glasgow 1923 Mar 6 717 Main station Scotland
2BE Belfast 1924 Oct 24 682 Main station Ireland
2LS Leeds 1924 Jul 8 866 Relay station North
2LS Bradford 1924 Jul 8 968 Relay station Relay from Leeds North
2ZY Manchester 1922 May 16 793 Main station North
5NO Newcastle 1922 Dec 24 742 Main station North
6FL Sheffield 1923 Nov 16 980 Relay station North
6KH Hull 1924 Aug 15 844 Relay station North
6LV Liverpool 1924 Jun 11 943 Relay station North
5SX Swansea 1924 Dec 12 622 Relay station Wales
5WA Cardiff 1923 Feb 13 850 Main station Wales
5IT Birmingham 1922 Nov 15 629 Main station Central
5NG Nottingham 1924 Sep 16 920 Relay station Central
6ST Stoke/Trent 1924 Oct 21 996 Relay station Central
2MT Writtle 1922 Feb 14 430 Marconi Co East
2LO London 1922 May 11 825 Main station Marconi House South
2LO London 1925 Apr 66 825 Main station Selfridges Store South
6BM Bournemouth 1923 Oct 17 775 Main station South
5PY Plymouth 1924 Mar 28 887 Relay station Cornwall
Source: Juan Franco Crespo, Spain
Via Yimber Gaviria, Colombia
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