| 摘要 |
The present invention seeks to provide a dual mode mobile satellite communication unit, which requires low communication cost and very little battery power, does not require always carrying a large unit frame and does not always provide great weight burden on the user. A terrestrial communication portable unit is detachably mounted in the mobile satellite communication unit. The mobile satellite communication unit as base unit does not include a key operating section, a display section and a speech transducer section having a microphone and a loudspeaker, and utilizes those mechanically assembled on the portable unit side for keying and other operations.In an interlocked relation to the removal of the portable unit, the stand-by state of the base unit is turned off. It is thus possible to avoid wasteful battery power consumption on the base unit side. Using a hollow cylindrical antenna, the inner cylindrical space thereof is used as a battery insertion space, thus dispensing with an independent battery mounting space. Very great space saving is thus attainable particularly in a mobile satellite communication unit, which requires high power and large size battery power supply.
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