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DECCA JAPAN
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This was the final Decca configuration for Japan showing the approximate coverage area. (Graphic courtesy Sena Company Ltd., Tokyo, Japan. Enhanced by Jerry Proc).
Power output for all transmitters was 1.2 kilowatts
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FUNCTION |
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FREQ. |
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| HOKKAIDO 9C | Master (6f) | Biei (1) | 43°35' 55"N
142°26'59"E |
14.2880 kHz | 85.7250 kHz | July 1967 | March 2001 |
| Red (8f) | Akkeshi | 43°03'51"N
144°47'41"E |
114.300 kHz | ||||
| Green | Wakkanai | 45°23'10" N
141°39'18"E |
128.588 kHz | ||||
| Purple | Oshamanbe | 42°30'08"N
140°21'47"E |
71.438 kHz | ||||
| KITA-
KYUSHU 7C |
Master (6f) | Maebaru | 33°27' 44"N
130°10'41"E |
14.2283 kHz |
85.3700 kHz | May 1969 | March 1998 |
| Red (8f) | Kamiagta | 34°38'24"N
129°21'21"E |
113.827 kHz | ||||
| Green (9f) | Nagashima | 32°07'57"N
130°08'39"E |
128.055 kHz | ||||
| Purple (5f) | Seto | 33°25'55"N
132°13'32"E |
71.142 kHz | ||||
| TOHOKU 6C | Master (6f) | Kannari (2) | 38°52'00"N
141°04'57"E |
14.1975 kHz | 85.185 kHz | March 1976 | June 1992 |
| Red (8f) | Kawauchi | 37°22'10"N
140°51' 09"E |
113.580 kHz | March 1976 | |||
| Green | Taneichi | 40°17'35"N
141°45' 13"E |
127.788 kHz | March 1976 | |||
| Purple | Awashirma (3) | 38°27'38"N
139°14' 43"E |
70.988 kHz | March 1980 | |||
| KANTO 8C | Master (6f) | Tateyama | 34°57'36" N
139°53' 59"E |
14.2583 kHz | 85.550 kHz | March 1979 | June 1993 |
| Red (8f) | Hachijojima | 33°05' 21" N
139°48' 58"E |
114.066 kHz | March 1979 | |||
| Green | Hokota | 36° 09' 35"N
140°33' 23"E |
128.325 kHz | March 1979 | |||
| Purple | Hamaoka (3) | 34° 37' 52"N
138°06' 45"E |
71.291 kHz | March 1980 | |||
| SHIKOKU 4C | Master (6f) | Nahari | 33°26' 10"N
134°05' 52"E |
14.1383 kHz | 84.830 kHz | April 1982 | June 1993 |
| Red (8f) | Outsuki | 32° 46' 53"N
132°44' 43"E |
113.106 kHz | ||||
| Green | Taiji | 33° 34' 37"N
135°57' 23"E |
127.245 kHz | ||||
| HOKURIKU 2C | Master (6f) | Mikuni | 36°14'43"N
136°08' 31"E |
14.0775 kHz | 84.465 kHz | May 1985 | June 1993 |
| Red (8f) | Suzu | 37° 26' 42"N
137°13' 13"E |
112.6200 kHz | ||||
| Green | Tottori | 35° 31' 07"N
134°15' 58"E |
126.6975 kHz |
Note 1 - This station had a 200 meter mast. Typical mast height in the Japanese chains was 120 meters.
Note 2 - The announcement that Japan was going to add a third Decca chain came in June 1973. Multipulse (MP) equipment was installed at the onset at the Tohoku. Experimental transmissions began in 1974.
Note 3 - This Purple station was added later.
TYPICAL STATION CONFIGURATION Depicted below are the elements of the Decca site of the Mikuni master station in the Hokuriku Chain.
It is believed the Japanese based their equipment design on the Decca 1880 series of equipment as there are many similarities in the design. In particular, there was additional metering added to each cabinet.
Helix Coil System - Connects between transmitter and antenna.Transmitting Antenna - Connects to Helix Coil System. The spark gap can be seen at the left of the photo Decca Transmitter Set - Interconnects with Phase Control and Switching and Control Panel.
Switching and Control - Connects to Helix Coil System, Decca Transmitter Set, Phase Control Cabinet and Remote Control Equipment. Phase Control Cabinet - Interconnects with the Decca Transmitter Set and the Switching and Control Panel.
Remote Control Equipment - Connects with 2 GHz Transmitting/Receiving Equipment, Switching and Control Panel, Control Desk, and Monitor and Control Desk. Control Desk - Connects to Remote Control Equipment, 2 GHz Transmitting/Receiving Equipment, and Monitor/Control Console. Monitor and Control Console - Connects to Control Desk, Remote Control Equipment, and 2 GHz Transmitting/Receiving Equipment. 2GHz Transmitting Receiving Equipment - Connects to Remote Control Equipment, Control Desk, and Monitor and Control Desk Control Link Antenna - Only connects to the 2GHz Transmitting/Receiving Equipment. Station Power System All images provided by the Sena Company Ltd., Tokyo, Japan
June 20/03
