User Manual

Table Of Contents
Notices Notices-iiiPTX-PRO User and Technical Manual
1. [P] RF power input. Convert watts to milliwatts =
Watts * 1000
2. [G] Antenna gain dBi. Convert to numeric gain =
Antilog (dBi/10)
3. [EIRP] Multiply P * G
4. [R] Convert centimeters to feet = Centimeters * .0328
5. Square R
6. Multiply R² * 4π
7. [S] Divide (R² * 4π) into EIRP
S = Power Density in milliwatts per square centimeters.
Note: At frequencies above 1500 MHz, S must not be
greater than 1
Reference
FCC OET Bulletin 65, August 1997 - Evaluating
Compliance with FCC Guidelines for Human Exposure to
Radio Frequency Electromagnetic Fields
The example shown in Figure 1 is a typical graph for an
MRC PTX-PRO 13 GHz Transmitter and shows the
permissible exposure distance for various antennas.
Graphs and data will vary, based on the actual transmitter,
output power, frequency, and antenna utilized. The plot
provides the permissible output of the transmitter for digital
modulation
MRC, in accordance with the requirements set forth by the
FCC, provides this information as a guide to the user. It is
assumed that the users of this equipment are licensed and
qualified to operate the equipment per the guidelines and
recommendations contained within the product user guides
and in accordance with any FCC rules that may apply.
Figure 1: Digital Modulation
The following table reflects the graphic representations above.
Table 1:
Antenna
Gain (dBi)
Minimum
Distance from
Antenna (cm)
Minimum Distance
from Antenna (inch)
08 3.15
5 45 17.71
16 51 20.07
20 80 31.49
35 449 176.73