4
Equation 2:
2
/
(
4
)
(
cm
mW
mt
ExposureLi
n
AntennaGai
DutyCycle
mW
ower
ConductedP
MPED
Where: MPED is Maximum Permissible Exposure Distance or safe distance.
All quantities are calculated in linear or numeric quantities.
The exposure limit, MPED, and conducted power units must be consistent, mW and cm
for this case.
Duty cycle is set using packet sizes for master and slave. Packet sizes are set in the radio
Network Configuration Menu. At Power up and with no data transmitting, the radios
will transmit or beacon with a duty cycle of 6 to 10% depending upon modulation
setting. The maximum Duty Cycle is 100%.
Table of MPE Safe Distance vs. Antenna Gain and Power Output Setting
Power Out
Setting
(mW)*
Duty
Cycle
(linear)
Antenna
Gain
(dBi)
Antenna
Gain
(linear)
FCC MPE
Limit
(mW/cm
2
)
Safe
Distance
(cm)
5890
1.00
2.1
1.622
0.2
61.65
*The worst case is 5890 mW with a 2.1dBi gain antenna at 61.65cm
1.1 Performance
Transmitter
Frequency Range:
217-222 MHz
Output Power:
2 Watts, all 217-220 MHz modulations
3 Watts, MSK, 15 KHz, 220-222 MHz
2 Watts, MSK, 50 KHz, 220-222 MHz
5 Watts, all 220-222 MHz modulations except MSK
Range (Line of Sight): 70+ miles
Modulation (Part 90): MSK, QPSK, 8PSK, 16PSK, 32PSK
Modulation (Part 80): MSK, QPSK, 8PSK, 16QAM, 32QAM
RF Data Rate:
8.75 Kbps to 800 Kbps
Occupied Bandwidth: 9.2 KHz to 176 KHz
Frequency Stability:
Better than 1.0 ppm
Duty Cycle:
Continuous
Output Impedance:
50 Ohms
Specifications
