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Transmitting Stations and using frequencies

In Japan, the most famous frequency is 53.750MHz (Ham-band). The transmitting station is located at Fukui, Japan. As other frequency, Japanese observers use 28.208MHz (Ham-band). And some observers also use VOR (VHF Omni directional Range) at 108MHz - 118MHz. The countable meteor echo number becomes low count using higher frequency. Japanese observers therefore adopt 53MHz radio wave. 28.208MHz radio wave is used for detection of darker meteor echoes.

about Transmitting Station

As above, there are some transmitting stations in Japan.

HRO at 53.750MHz (located at Fukui, Japan, transmitted by Kimio MAEGAWA)

JA9YDB

This radio wave is beacon in Ham-band. The transmitting power is 50W and the cross Yagi antenna is setup. The radio wave of this station is very stable and continuously at all times for ham commnication. Japanese radio observers use this frequency. The right picture is transmitting antenna (left). The following is the antenna pattern simulation by Mr. Kimio Maegawa.

53MHz 53MHz

HRO at28.208MHz (located at Nagano, Japan, transmitted by Noriyuki YAGUCHI)

28MHz

28.208MHz observation started since November 2002 for detecting fainter meteor of Leonids. Since 2002 Leonids, 28MHz observation has caught many meteor showers and interesting results. This frequency is expected to catch darker meteor activity than 53MHz observation. This is because the underdense (the electron density on the ionized trail is lower than 10^(-14) electrons per meter) causes Heigh Ceiling effect. This effect determins limited hight of detection of ionized trail. Although there are many problems, this observation will be useful for researching the mass distribution (I think ...) . The antenna pattern at transmitting station is shown in right figure. The transmitting power is 50W with CW radio wave.