FreeWave Technologies Inc. AMM0300AT 사용자 설명서
Chapter 2: Hardware and Pinouts
LIM0001AA Rev B (DRAFT)
The FCC permits 1 Watt output power at the transceiver and 36 dBm (4 Watts) at the antenna. When
calculating the power gain, use the following equation to determine the total output power at the antenna. Loss
calculations should include cable, connectors, surge protectors, and so on.
calculating the power gain, use the following equation to determine the total output power at the antenna. Loss
calculations should include cable, connectors, surge protectors, and so on.
Transceiver Output – Losses + Antenna Gain = Output Antenna Power
For example, 30 dBm – 2 dB + 6 dB = 34 dBm (or 2.5 Watts). 34 dBm is within the FCC limits. However,
30 dBm – 2 dB + 10 dB = 38 dBm (or 6.3 Watts) exceeds the FCC limits.
30 dBm – 2 dB + 10 dB = 38 dBm (or 6.3 Watts) exceeds the FCC limits.
Cable
Type
Attenuation
(db/100 ft)
Run Length (ft)
Total Run Attenuation (dB)
LMR400
3.93
25
1.0
LMR500
3.154
25
0.8
LMR600
2.518
25
0.6
LMR900
1.709
25
0.4
Shielding
FreeWave OEM transceivers are shielded to prevent any unintended emission. Additional shielding may be
required to prevent the OEM equipment from interfering with the FreeWave transceiver. This is unlikely but it
depends on the equipment and components in the OEM application.
required to prevent the OEM equipment from interfering with the FreeWave transceiver. This is unlikely but it
depends on the equipment and components in the OEM application.
8
Draft