| 摘要 |
<p>PURPOSE:To attain data transmission with one radio frequency between remote points and to eliminate radio interference, by storing received polling and data signals temporarily, and transmitting the signals after subjecting to signal conversion as required. CONSTITUTION:Relay stations RR1, RR2 are provided with storage/discrimination circuits MD1, MD2. The frequency of the polling signal calling out an observation station OS from a supervisory station SS is made common in F1, the polling signal is somewhat converted into A1-A3. A response signal B from the station OS is a signal F1, and the content of the response signal is converted into B1-B3. Each station uses the radio wave F1 under time division control.</p> |
