|
Items |
Technical standards |
| Class of emissions | A1D, F1D, G1D |
| Assigned frequency or designated frequency | 402MHz to 405MHz |
| Tolerance of frequency (×10-6) | 100 |
| Tolerance of occupied bandwidth | 300kHz |
| Tolerance of unwanted emission intensity | In frequency ranges detuned from carrier frequency
by ±150kHz or more: EIRP: 250nW or less |
| Antenna gain | EIRP : 25µW Error : +20%, -50% |
| Limit of secondary radiated emission | EIRP : 4nW or less |
| Carrier sensing function | (1) When radio station receives a radio wave transmitted from other station
etc which reception power level is higher than the value calculated from
the following expression, the radio station shall not transmit radio wave
in the received frequency band. 10 log B – 150 + G (dBm) where B : Maximum radiation bandwidth under communications (Hz) G : Absolute gain of receiving antenna (dBi) However when radio station receives radio waves transmitted from other station etc which reception power level are higher than the value calculated from above expression at all frequency bands from over 402MHz to 405MHz, the radio station may transmit radio wave at a frequency band where the receiving power level is the minimum. (2) Reception bandwidth for carrier sensing shall be wider than the maximum radiation bandwidth. (3) Reception period at carrier sensing shall be longer than 10milli-seconds and sweep repetition period for carrier sensing at all frequencies from over 402MHz to 405MHz shall be shorter than 5seconds. |
| Transmission suspension function due to interruption of communications | Transmission shall be suspended when communication is interrupted for 5seconds or more |
| Notice: Regulations in the Ordinance Regulating Radio Equipment shall have priority over the descriptions in the sheet when any difference is found between them. Further above descriptions do not cover all of the regulations. |