Pacific Microwave Research AT100C3 Microwave Video and Audio Transmitter User Manual AT 100C3 User s Manual REV

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Pacific Microwave Research, Inc.
AT-100 Series
Microwave Video and Audio Transmitter
USER’S MANUAL
Pacific Microwave Research, Inc.
1485 Poinsettia Avenue, Suite 111
Vista, CA 92081
760.295.5416
www.pmicrowave.com
S/N ________________
Pacific Microwave Research, Inc.
AT-100C3 User’s Manual
© 2003
IMPORTANT WARNING!
THIS EQUIPMENT WILL POSE A RADIATION HAZARD
IF IMPROPERLY HANDLED
Pacific Microwave Research, Inc. (PMR), in compliance with RF exposures limits set
forth in OET Bulletin 65, Fourth Edition, August, 1999.1 The following text is intended
to notify the user of PMR’s transmitter equipment that a radiation hazard could exist if
the AT-100C3 transmitter is improperly operated. The user should carefully read and
understand this section before operating equipment.
PMR’s AT-100C3 microwave transmitter is rated at 0.5W (+27 dBm) nominal RF power
output and has been designed as an intentional radiator. The transmitter may produce as
much as 1.0W (+30 dBm). The device can deliver video and audio signals over short
ranges when used with PMR’s AR-100C3 receiver and appropriate antennas in either
fixed or mobile applications. When the AT-100C3 transmitter is operating into an
antenna, the system is emitting radio frequency energy!
An internal RF isolator prevents emission of energy at the antenna terminal when no
antenna is connected even when the transmitter is powered up. Because the AT-100C3 is
an isolator protected low power device, there is no hazard potential until a proper antenna
is connected to the RF output terminal. Safe operating procedures must be observed
when the unit is transmitting into an antenna.
Safe distance is based on the MPE exposure limits identified in Table 1. (FCC Limits for
Maximum Permissible Exposure) of OST 65. The maximum power density allowed at
6400 MHz is 5 mW/cm2 for occupational/controller exposure and 1 mW/ cm2 for general
population/uncontrolled exposure.
Table 1 indicates the safe distance for mobile
operations based upon a transmitter power output of 1.0W and an antenna gain of +2 dBi.
Frequency – 6400 MHz
TX Power – 1.0W (+30 dBm)
Antenna Gain - +2 dBi
Safe Distance from Antenna Under Mobile Conditions
Controlled Exposure (5 mW/cm2)
Uncontrolled Exposure (1 mW/cm2)
5 cm
11.3 cm
Table 1. FCC limits for MPE based on OST 65 for PMR AT-100C3 Transmitter (mobile)
The complete text may be found at:
www.fcc.gov/bureaus/engineering_technology/documents/bulletins/oet65/oet65.pdf
Pacific Microwave Research, Inc.
AT-100C3 User’s Manual
© 2003
Exposure level is relative to antenna gain. Gain antennas (parabolic dish, horn, helical,
Yagi, etc.) will increase the safe distance required. A typical high-gain antenna used for
fixed applications may exhibit up to 30 dBi gain. The high-gain antenna concentrates
transmitter energy into a narrow beam and extends the safe operating distance. The
maximum power density allowed at 6400 MHz is 5 mW/cm2 for occupational/controller
exposure and 1 mW/ cm2 for general population/uncontrolled exposure. Table 2 indicates
the safe distance for fixed operations based upon a transmitter power output of 1.0W and
an antenna gain of +30 dBi.
Frequency – 6400 MHz
TX Power – 1.0W (+30 dBm)
Antenna Gain - +30 dBi
Safe Distance from Antenna Under Fixed Conditions
Controlled Exposure (5 mW/cm2)
Uncontrolled Exposure (1 mW/cm2)
1.3 m
2.8 m
Table 2. FCC limits for MPE based on OST 65 for PMR AT-100C3 Transmitter (fixed)
The user must calculate the safe distance based on the antenna gain required for the
application. Pacific Microwave Research can provide such calculations in consultation
with the user if required. Contact PMR at 760.295.5416 for additional information.
SAMPLE CALCULATIONS
Equation:
r=
EIRPmW
4π • Pd
Where:
r= safe distance in cm
EIRPmW = TX power(dBm) plus Antenna gain
(dBi) in mW {referenced to isotropic radiator}
Pd= Power density in cm2 (1 or 5)
Example: Mobile use with 2dBi antenna under controlled conditions.
r=
1600
4π • 5
Where:
r= 5.04 cm
EIRPmW = +32 dBm (30 + 2) = 1600 mW
Pd= Power density 5cm2
Example: Fixed use with 30dBi antenna under controlled conditions.
1,000,000
r=
4π • 5
Where:
r= 126 cm (1.26 m)
EIRPmW = +60 dBm (30 + 30) = 1,000,000 mW
Pd= Power density 5cm2
Pacific Microwave Research, Inc.
AT-100C3 User’s Manual
© 2003
1.0 Introduction
The AT-100C3 Microwave Video and Audio Transmitter from Pacific Microwave
Research is a compact transmitter designed for short-range transmission applications
under FCC Part 74, and Part 101. Common uses include law enforcement surveillance
and electronic field production. The AT-100C3 is a compact unit designed for portable
and field applications to transmit remote video to a central receive location. The AT100C3 is designed to transmit one NTSC (or PAL) video signal plus two high quality
video signals. The AT-100C3 operates from a 12 Vdc power source and is capable of up
to 0.5 Watts of output power. The AT-100C3 may be equipped with up to 16 channels
consistent with parameters listed on the user’s FCC station license.
2.0 Operation
The following section describes the proper operating techniques for the AT-100C3
transmitter including power, antenna, video, and audio connections. The AT-100C3
generates heat during normal operation. The user should give careful consideration to
mounting the transmitter in such as way as to insure heat is directed away from the
housing. An external heatsink may be desirable in some operational modes.
2.1 Primary Connections
A number of connections must be made in order for the AT-100C3 to operate properly.
These include dc power; transmit antenna, video input, and audio input.
WARNING
Prior to transmitting, the user should determine the proper frequency or
channel of operation. Operating on the wrong frequency could cause
interference to other licensed users. Part 101 users may coordinate
frequencies through nationally recognized frequency coordination bodies
or through local law enforcement user groups. Part 74 users should contact
their local frequency coordinator or check www.sbe.org for additional
information. Always verify a frequency is not in use before transmitting.
2.1.1 DC Power Input
Pacific Microwave Research, Inc.
AT-100C3 User’s Manual
© 2003
The AT-100C3 is designed to operate from a nominal +12 Vdc power source. Power is
supplied through the front panel DB-9M connector (J3) with +12 Vdc on Pin 5 and
Ground on Pin 9. This source should be fused at 2.0 A. The AT-100C3 will operate over
a voltage range of +11 to +14.5 Vdc. Power consumption at the high power setting (2 W)
is nominally 1.2 A. Power consumption at the low power setting (0.5 W) is nominally
0.7 A. The input to the AT-100C3 is internally protected against reverse polarity. The
AT-100C3 transmitter is operating whenever power is applied.
2.1.2 Antenna
The antenna is connected to front panel female SMA connector (J9). Any resonant
antenna is suitable for connection. Antenna type and gain should be determined based
upon the intended application. Only high quality coaxial cable should be used to
interconnect the transmitter and antenna. All SMA connectors should be tightened with
the appropriate 5/16” wrench using approximately 5 in./lbs of torque. MAXIMUM
TORQUE IS 8 IN./LBS. DO NOT OVERTIGHTEN. Thumb tight connections are not
suitable for reliable operation!
2.1.3 Video Input
Video is input to the AT-100C3 through the front panel BNC connector (J10). This
unbalanced input accepts a nominal 1 Vp/p video input. The transmitter may be factory
configured for the NTSC or PAL standard. An NTSC transmitter must be used with an
NTSC receiver. A PAL transmitter must be used with a PAL receiver. Maintenance of
proper video levels is important to prevent over-modulation of the transmitter. High
video levels could potentially cause interference to adjacent channel users. Low video
levels will result in a lack of luminance at the receiver. Proper link performance demands
attention to video levels.
2.1.4 Audio Input
Audio is input to the AT-100C3 through the front panel DB-9M connector (J3).
Typically, the AT-100 is configured for two audio subcarrier channels. Each audio
subcarrier has a balanced input with a nominal impedance of 600 Ω. The AT-100C3 may
be factory configured for line or microphone level inputs. Line level audio is typically 0
dBm and microphone level is typically –50 dBm. Full deviation (+ 75 kHz) on a
transmitter configured for line level input is represented by a signal input level of + 9
dBm at 400 Hz. The input for subcarrier number one is on Pin 2 (+) and Pin 7 (-). The
input for subcarrier number two is on Pin 3 (+) and Pin 8 (-). Unbalanced audio may be
connected to the subcarrier inputs by connecting the high side of the audio source to the
(+) terminals and leaving the (-) terminals unconnected.
3.0 Power Output
Pacific Microwave Research, Inc.
AT-100C3 User’s Manual
© 2003
The AT-100C3 is capable of operating at two power levels to fit a variety of operational
scenarios. The high power setting is defaulted with no connection to Pin 1 of J3. The
nominal power output on high power is 0.5 W. To select low power, Pin 1 of J3 must be
connected to ground. This can be accomplished by placing a jumper in the rear of the
mating connector (Pin 6), by a remote switch, or by an open collector transistor junction.
4.0 Frequency Selection
Frequency selection of the AT-100C3 is accomplished by operation of a 16-position
rotary switch located on the rear panel. Use a small flat blade screwdriver or “tweaker”
tool to operate the switch. Frequencies are programmed into the transmitter in
accordance with the users FCC license parameters. Your radio (S/N ____________) is
programmed as indicated in Table 1.
CH
10
11
12
13
14
15
16
FREQ MHz
PIN
10
11
12
13
14
15
MHz
10
20
40
80
100
200
400
N/C
N/C
N/C
N/C
Table 2. Remote Frequency Control
Table 1. AT-100 Channel Assignments
As an option, users may select the frequency of operation of the AT-100C3 in 1 MHz
steps. This is accomplished by connecting a BCD switch to optional connector J11 in
accordance with the pin-out shown in Table 2. This option is only available to
government users.
Pacific Microwave Research, Inc.
AT-100C3 User’s Manual
© 2003
5.0 Specifications
Electrical:
• Frequency Range
o AT 100C3 – 6.4 to 7.1 GHz
• VSWR – Infinite (open or short)
• Modulation – True FM
• Modulation Sense – Positive
• Frequency Stability – +0.002%
• Emphasis – NTSC or PAL
• Spurious/Harmonic Output – > -65 dBc
• Analog or Digital Input filtering options
•
•
•
•
•
Video Input Impedance – 75 Ω unbalanced
Video Input Response – 10 Hz to 4.5 MHz
Video Input Sensitivity – 8 MHz/Volt
Audio – any two between 5.5 to 7.5 MHz
o Phase Lock Loop
o 20 Hz to 20 kHz +1.5 dB
ƒ 600 Ω Balanced Input
ƒ Microphone or Line Level
Power Output
o High Power – 0.5 W nominal
o Low Power – 0.1 W nominal
Environmental:
• Operating temperature: -10 to +65 °C
•
Relative Humidity: 0 to 95%, noncondensing
Mechanical:
• 9-pin full function I/O connector
• Dimensions – 1.5 H x 2.5 W x 3.5 L inches
• Video Input – BNC female
•
•
•
Housing – milled aluminum
Weight – 6.0 oz.
RF Output – SMA female
6.0 Mechanical
Pacific Microwave Research, Inc.
AT-100C3 User’s Manual
© 2003
7.0 Connector Pin-out
Connector J3 „ DB-9 Male „ System I/O
Connector Pinout Data
Pin #
Function
Lo/Hi Power – Tie to ground for low power
Audio 1 Input (HI)
Audio 2 Input (HI)
Aux Video Input (parallel with J10 BNC)
+11 to +14.5 Vdc – Primary power input
Ground
Audio 1 Input (LO)
Audio 2 Input (LO)
Ground
8.0 Repair
There are no user serviceable parts inside the AT-100C3. Damage to the QC seals on the
transmitter voids the warranty. Should your unit require service, contact Pacific
Microwave Research, Inc. at 760.295.5416 or www.pmicrowave.com to request an RMA
number.

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Title                           : Microsoft Word - AT-100C3 User's Manual REV.doc

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