Notices Notices-iiDXL5000 User and Technical Manual
DXL5000 System Receiver
This equipment has been tested and found to comply with the
limits for a Class A digital Device, pursuant to Part 15 of the FCC
Rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is
operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the instruction manual,
may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to
cause harmful interference in which case the user will be
required to correct the interference at his own expense.
DXL5000 System Transmitter
Changes or modifications not expressly approved by MRC could
void the user’s authority to operate the equipment.
WARNING - RF Power Hazard
High levels of RF power are present in the unit. Exposure to RF
or microwave power can cause burns and may be harmful to
health.
Remove power from the unit before disconnecting any RF cables
and before inspecting damaged cables and/or antennas.
Avoid standing in front of high gain antennas (such as a dish
antenna) and never look into the open end of a waveguide or
cable where RF power may be present.
RF Exposure - Safe Working Distances
MRC provides this warning for safety purposes with the intent to
inform the user of the potential hazard to RF exposure. The
following guidelines for safe operation were derived from OET
bulletin 65, August 1997, as recommended by the Federal
Communications Commission (FCC).
The DXL5000 Transmitter is designed to provide services to
broadcast ENG users under CFR 74 subpart F and 74.601 TV
pickup stations. This unit, operated without an antenna, will not
create RF energy exceeding 1.0 mW/cm
2
, the FCC limit for
exposure. Once connected to an antenna, the potential for
harmful exposure will be greatly enhanced.
In this situation, a certain distance from the radiator is to be
maintained. Calculations need to be performed to understand
what that safe margin for exposure is. This is known as the
Maximum Permissible Exposure (MPE) limit.
Note
Hazardous RF radiation limits and recommended
distances may vary by country. Ensure that all
applicable state and federal regulations are
observed when using this transmitter.
Calculations provided are for common antennas often utilized in
the ENG environment. The following formula used is that
suggested by OET 65.
Calculating MPE
EIRP = P * (10 ^ (G / 10)) = (antilog of G/10) * P
P = RF power delivered to the antenna in mW
G = Power gain of the antenna in the direction of interest relative
to an isotropic radiator
R = distance to the center of radiation of the antenna in
centimeters
S = MPE in mW/cm² (milliwatts per square centimeters)
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