Marti Electronics SR-20M User manual
MARTI
ELECTRONICS
STL RECEIVER
MODELS: SR–20M
SR–20C
October, 2003 IM No. 597–8105
i
WARNING
THIS EQUIPMENT
MUST
BE OPERATED WITH A 3–PRONG
GROUNDED OUTLET RECEPTACLE. FAILURE TO USE A
PROPERLY GROUNDED OUTLET MAY RESULT IN
IMPROPER OPERATION OR SAFETY HAZARD!
LIMITED WARRANTY
The Seller warrants that, at the time of shipment, the products manufactured by the Seller are free from defects in
material and workmanship. The Seller’s obligation under this warranty is limited to replacement or repair of such
products, which are returned to Marti at its factory, transportation prepaid and properly insured, provided:
a. Notice of the claimed defect is given to Marti within one (1) year [two (2) years for STL systems] from date of
original shipment and goods are returned in accordance with Marti instructions.
b. Equipment, accessories, tubes and batteries not manufactured by Marti are subject to only such adjustments as
Marti may obtain from the supplier thereof.
c. This warranty does not apply to equipment that has been altered, improperly handled, or damaged in any way.
The Seller is in no event liable for consequential damages, installation cost or other costs of any nature as a result of
the use of the products manufactured or supplied by the Seller, whether used in accordance with instructions or not.
This warranty is in lieu of all others, either expressed or implied. No representative is authorized to assume for the
Seller any other liability in connection with Seller’s products.
MAILING & SHIPPING ADDRESS:
Broadcast Electronics
MARTI
Electronics Division
4100 North 24th Street
Quincy, IL 62301
The United States of America
COPYRIGHT NOTICE
2003 All Rights Reserved
Marti Electronics
No part of this manual may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into
any language, natural or computer, in any form or by any means, without the prior written permission of Marti
Electronics.
ii
Copyright laws protect artwork depicting circuitry in this manual.
Information in this manual is subject to change without notice and does not represent a commitment on the part of
Marti Electronics.
Marti Electronics may make improvements and/or changes in this manual or in the product described herein at any
time.
This product could include technical inaccuracies or typographical errors.
PHONE NUMBERS:
Sales (817) 735–8134
Service (217) 224–9600
FAX (817) 735–9340
iii
ABOUT THIS MANUAL
This manual supports both the SR–20M and SR–20C STL receivers for all standard frequency bands. The manual
will be revised as new frequency bands become available.
Manual Part Numbers:
Kit, Binder And Manual: 979–9998
Manual Only 597–8105
iv
TABLE OF CONTENTS
Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications & Ordering 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unpacking & Inspecting 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Antennas 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Performance Tests 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Theory of Operation 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Equipment 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tools For Alignment 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tune–up and Adjustments 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Schematic and Assembly Drawings 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INTRODUCTION
See the SPECIFICATIONS & ORDERING section for a listing of available frequency
ranges.
SR–20M MONO STL RECEIVER
SR–20C COMPOSITE STL RECEIVER
2
The Marti STL Transmitters with companion SR–20C and SR–20M Receivers form a high quality FM, syn-
thesized, point–to–point, line of sight, studio–to–transmitter link with two optional sub–channels. A dual link con-
sisting of two SR–20M systems for stereo provides two identical broadcast quality channels with better than 70 dB
stereo cross–talk and four optional sub–channels. Complex systems can be built from basic STL transmitters and
SR–20M/SR–20C receivers having multiple relay (repeaters), bi–directional (full duplex), and automatic switching
hot standby features.
The SR–20M receiver is a monophonic single channel unit that can be programmed on any frequency within a
50 MHz band. The SR–20C is a composite frequency agile receiver. The SR–20C can be programmed for any
frequency within a 50 MHz band. Each SR–20M and SR–20C STL receiver is offered in a wide range of band
models. Refer to the SPECIFICATIONS & ORDERING section for a listing of available frequency ranges.
The SR–20M/SR–20C receivers operate from: 1) an 85 to 264 volt, 47 to 63 Hz AC source or 2) a +10 to +14
volt DC source. SR–20M units are equipped with a multimeter and meter select switch for the monitoring of signal
level, subcarrier level, power supply voltage, and program output level parameters. SR–20C units are also equipped
with a multimeter and meter select switch for the monitoring of signal level, subcarrier level, power supply voltage,
monophonic program output level, and composite output level parameters. A front panel attenuation switch allows
the input level to be adjusted to minimize any IMD products. Additional front panel controls include: 1) a mono-
phonic program output level control, 2) a squelch control, and 3) a composite level control for SR–20C units. The
SR–20M/SR–20C front panel indicators include: 1) MAX signal, 2) ATT signal, 3) UNSQUELCHED, 4) POWER,
and 5) AFC LOCK.
STL Transmitter/SR–20M Applications:
STL for FM stereo broadcast (dual system)
STL for AM stereo broadcast (dual system)
STL for FM monaural or AM monaural broadcast
Inter–city relay for linking two or more broadcast facilities
Multi–relay system for radio network distribution
Communications link between satellite earth station and broadcast facilities
Data and Background Music links
Private microwave service
STL Transmitter/SR–20C Applications:
•Composite FM Stereo audio with subcarrier
•Monophonic audio with two subcarriers
•Digital stereo audio (requires external modems)
•Multi–channel audio or data (requires external MUX)
•Digital data (requires external modems)
3
SR–20M/SR–20C Features:
•Mechanical – 19 inch rack mount design
•Wideband operation – 50 MHz
•SR–20M Models – Monophonic single channel operation within a 50 MHz band
•SR–40C Models – Composite frequency agile operation within a 50 MHz band
•Operation from: 1) 85V to 264V, 47 to 63 Hz AC source or 2) an external +10 to +14
VDC source
•Frequency synthesized dual stage RF converter module with Automatic Frequency
Control (AFC)
•Front panel signal attenuation control – used to minimize IMD products
•Front panel squelch control
•Front panel headphone control and receptacle
•A microcontroller programmed to perform the following functions:
•Front–panel switch and indicator control
•AFC lock control
•Metering control
•Auto recovery from loss of ac/dc power
•Squelch relay with contacts available for external switching
4
SPECIFICATIONS & ORDERING
SR–20M STL Receiver
Frequency Bands: See ORDERING INFORMATION below.
Type of technology to produce op-
erating frequency: Phase–locked loop; synthesized.
Operating Temp. Range: –10ºC to +50ºC.
Frequency Stability (over operat-
ing temperature range): 0.0001 %.
SR–20M Signal–to–Noise
@ 100 uV:
200 kHz BW @ 50 kHz Dev
125 kHz BW @ 15 kHz Dev
125 kHz BW @ 9 kHz Dev
Greater than 77 dB.
Greater than 66 dB.
Greater than 62 dB.
Frequency Response: ±0.25 dB, 20 Hz to 15 kHz.
Distortion @ 100 uV:
200 kHz BW @ 50 kHz Dev
125 kHz BW @ 15 kHz Dev
125 kHz BW @ 9 kHz Dev
0.25% or less, 20 Hz to 15 kHz.
0.3% or less, 20 Hz to 15 kHz.
0.3% or less, 20 Hz to 15 kHz.
Spurious Response: –90 dB.
RF Input Impedance: 50 ohms.
RF Connector: Type N–Female.
Output Level: –10 to +11 dBm .
Output Impedance: Balanced, 600 Ohms – terminal strip/15 pin D–Type. Unbalanced 600
Ohms – BNC.
Sensitivity: 3 microvolts for 50 dB signal–to–noise.
10 microvolts for 60 dB signal–to–noise.
100 microvolts for maximum signal–to–noise, typically 75 dB or greater.
Metering/Indicators: Illuminated meter indicates: 1) signal level, 2) subcarrier level, 3) power
supply level, and 4) mono program output level. LEDs – MAX Signal,
ATT Signal, UNSQUELCHED, POWER supply, and AFC LOCK.
Front Panel Controls: SIGNAL ATTENUATION, MONO PROGRAM OUTPUT LEVEL,
SQUELCH LEVEL, meter selection control, HEADPHONE level control.
Power Requirements: 85 to 264 VAC, 47 to 63 Hz.
External DC operation – +10 to +14 VDC.
Approximate AC Current Re-
quirements: 1.5 Amps.
Accessory Connector: Terminal strip or 15 pin D–Type.
Weight: Net 7.6 pounds.(3.5 kilograms).
Dimensions: 3.5 in. high x 19 in. wide x 15 in. deep.
(8.9 cm. high x 48.3 cm. wide x 38.1 cm. deep.)
Regulatory: FCC, DOC.
5
SR–20C STL Receiver
Frequency Bands: See ORDERING INFORMATION below.
Type of technology to produce op-
erating frequency: Phase–locked loop; synthesized.
Operating Temp. Range: –10ºC to +50ºC.
Frequency Stability (over operat-
ing temperature range): 0.0001%.
Monophonic Signal–to–Noise
@ 100 uV:
200 kHz BW @ 50 kHz Dev
125 kHz BW @ 15 kHz Dev
125 kHz BW @ 9 kHz Dev
Greater than 75 dB.
Greater than 64 dB.
Greater than 60 dB.
Monophonic Frequency
Response: ±0.2 dB, 20 Hz to 15 kHz.
Monophonic Distortion
@ 100 uV:
200 kHz BW @ 50 kHz Dev
125 kHz BW @ 15 kHz Dev
125 kHz BW @ 9 kHz Dev
0.25% or less, 20 Hz to 15 kHz.
0.3% or less, 20 Hz to 15 kHz.
0.3% or less, 20 Hz to 15 kHz.
Composite Signal–to–Noise: Greater than 75 dB, dependent upon the operating frequency, demodu-
lated, deemphasized.
Composite Frequency Response:
Composite
Wideband ±0.2 dB, 30 Hz to 53 kHz.
±0.3 dB, 30 Hz to 100 kHz.
Composite Distortion: 0.2% or less, 20 Hz to 15 kHz, demodulated, deemphasized, low–pass
filtered, left or right channel.
Spurious Response: –90 dB.
RF Input Impedance: 50 ohms.
RF Connector: Type N–Female.
Monophonic Output Level: –10 to +11 dBm.
Monophonic Output Impedance: Balanced, 600 Ohms – terminal strip/15–pin D–Type.
Composite Output Level: 0.25V to 8V p–p.
Sensitivity: 4 microvolts for 50 dB signal–to–noise.
14 microvolts for 60 dB signal–to–noise.
100 microvolts for maximum signal–to–noise, typically 75 dB or greater.
Metering/Indicators: Illuminated meter indicates: 1) signal level, 2) subcarrier level, 3) power
supply level, 4) mono program output level, and composite program out-
put level. LEDs – MAX Signal, ATT Signal, UNSQUELCHED, POWER
supply, and AFC LOCK.
Front Panel Controls: SIGNAL ATTENUATION, MONO PROGRAM OUTPUT LEVEL,
COMPOSITE OUTPUT LEVEL, SQUELCH LEVEL, meter selection
control, HEADPHONE level control.
Power Requirements: 85 to 264 VAC, 47 to 63 Hz.
External DC operation – +10 to +14 VDC.
Approximate AC Current Re-
quirements: 1.5 Amps.
Accessory Connector: 15–pin D connector or terminal strip.
6
Weight: Net 7.8 pounds.(3.5 kilograms).
Dimensions: 3.5 in. high x 19 in. wide x 15 in. deep.
(8.9 cm. high x 48.3 cm. wide x 38.1 cm. deep.)
Regulatory: FCC, DOC.
7
ORDERING INFORMATION
MARTI PART # Description
SR20M–150–200 SR–20M Mono STL Receiver, 135 to 185 MHz, Single Channel, 200 kHz Receive Bandwidth,
110/220VAC 50/60 Hz Operation.
SR20M–150–125 SR–20M Mono STL Receiver, 135 to 185 MHz, Single Channel, 125 kHz Receive Bandwidth,
110/220VAC 50/60 Hz Operation.
SR20M–240–200 SR–20M Mono STL Receiver, 215 to 265 MHz, Single Channel, 200 kHz Receive Bandwidth,
110/220VAC 50/60 Hz Operation.
SR20M–240–125 SR–20M Mono STL Receiver, 215 to 265 MHz, Single Channel, 125 kHz Receive Bandwidth,
110/220VAC 50/60 Hz Operation.
SR20M–330–200 SR–20M Mono STL Receiver, 300 To 350 MHz, Single Channel, 200 kHz Receive Bandwidth,
110/220VAC 50/60 Hz Operation.
SR20M–330–125 SR–20M Mono STL Receiver, 300 To 350 MHz, Single Channel, 125 kHz Receive Bandwidth,
110/220VAC 50/60 Hz Operation.
SR20M–450–200 SR–20M Mono STL Receiver, 430 To 480 MHz, Single Channel, 200 kHz Receive Bandwidth,
110/220VAC 50/60 Hz Operation.
SR20M–450–125 SR–20M Mono STL Receiver, 430 To 480 MHz, Single Channel, 125 kHz Receive Bandwidth,
110/220VAC 50/60 Hz Operation.
SR20M–950–200 SR–20M Mono STL Receiver, 935 To 965 MHz, Single Channel, 200 kHz Receive Bandwidth,
110/220VAC 50/60 Hz Operation.
SR20C–150–250 SR–20C Composite STL Receiver, 135 to 185 MHz, Frequency Agile, 250 kHz Receive
Bandwidth, 110/220VAC 50/60 Hz Operation.
SR20C–240–250 SR–20C Composite STL Receiver, 215 to 265 MHz, Frequency Agile, 250 kHz Receive
Bandwidth, 110/220VAC 50/60 Hz Operation.
SR20C–330–250 SR–20C Composite STL Receiver, 300 To 350 MHz, Frequency Agile, 250 kHz Receive
Bandwidth, 110/220VAC 50/60 Hz Operation.
SR20C–450–250 SR–20C Composite STL Receiver, 430 To 480 MHz, Frequency Agile, 250 kHz Receive
Bandwidth, 110/220VAC 50/60 Hz Operation.
SR20C–950–250 SR–20C Composite STL Receiver, 935 To 965 MHz, Frequency Agile, 250 kHz Receive
Bandwidth, 110/220VAC 50/60 Hz Operation.
8
UNPACKING & INSPECTING
This equipment was factory tested, inspected, packed, and delivered to the carrier with utmost care. Do
not accept shipment from carrier, which shows damage or shortage until the carrier’s agent endorses a state-
ment of the irregularity on the face of the carrier’s receipt. Without documentary evidence, a claim cannot be
filed.
Unpack equipment immediately up–on receipt and thoroughly inspect for concealed damage. If damage
is discovered, stop further unpacking and request immediate inspection by local agent of carrier. A written
report of the agent’s findings, with his signature is necessary to support claim. Check your shipment against
the shipping papers for possible shortage. Do not discard any packing material until all items are accounted
for. Small items are often thrown away with packing material.
Packing material should be retained until equipment testing is completed. Any equipment returned to the
factory should be packed in original cartons, insured, and pre–paid.
9
INSTALLATION
IMPORTANT NOTICE
This equipment must be operated in a well–ventilated
rack cabinet.
Install rack–mounted equipment in a well–ventilated, well–grounded, and shielded rack
cabinet. Do not locate solid–state equipment in a rack above tube–type equipment, which
produces high temperatures.
Problems can also be avoided by locating this unit away from other equipment, which has
transformers that produce strong magnetic fields. These fields can induce hum and noise into the
Marti equipment thus reducing performance. Strong radio frequency (RF) fields should be avoided
where possible. Extensive shielding and filtering has been incorporated into this equipment to
permit operation in moderate RF environments. All equipment racks, cabinets, etc. should be
bonded together by wide copper grounding strap to ensure that all system elements are at RF
ground potential.
SR–20M CONNECTIONS
Refer to Figure 1 as required for the following connections.
1. Connect the receiving antenna coax to the ANTENNA TYPE N port on the rear–panel using a type–N male
connector. A short flexible jumper, 20 inches maximum, may be used between the ANTENNA port and the
Heliax. Marti Part No. 585–017 Double–Shielded, Low–Loss RG–214/U jumper is recommended.
2. Balanced program audio output is located at accessory circuit board connector J2–1 and J2–2 (refer to Figure 2).
The output level can be adjusted from –10 to +11 dBm. Connect shielded audio cable to J2–1 and J2–2. If
unbalanced audio is desired, connect a cable to BNC receptacle J2 on the rear panel.
3. Connect a Remote Control or Subcarrier Demodulator to the SUB1 OUT J1 or SUB2 OUT J3 BNC connectors
on the rear–panel. The subcarrier: 1) impedance may be 600 to 10 K ohms and 2) the output level is approxi-
mately 0.5 Volts peak–to–peak. Subcarrier frequencies may be between 26 KHz and 110 KHz.
4. For dual channel stereo operation, use only Marti MTS–1 coaxial transformer for splitting the received signal to
the two receivers.
CAUTION
IF DC OPERATION IS REQUIRED, DO NOT APPLY MORE THAN +14V
TO THE UNIT.
5. Ensure the receiver rear–panel ON/OFF switch is OFF. Connect the rear–panel AC line receptacle to an 85 to
264V, 47 to 63 Hz AC power source. USE ONLY A 3–PRONG GROUNDED OUTLET RECEPTACLE
FOR SAFETY. The unit can also be operated from a +10V to +14V external dc supply. If dc operation is
required, refer to Figure 2 and connect: 1) the positive wire to J2–13 and 2) ground to J2–14.
6. The receiver is equipped with a rear–panel ground terminal. Connect a ground wire between earth ground and
the GND terminal on the receiver rear panel.
10
FIGURE 1. SINGLE/DUAL SR–20M SYSTEM
597–8105–1
COPYRIGHT2003 MARTI ELECTRONICS, INC
11
FIGURE 2. ACCESSORY/REMOTE CONNECTIONS
597–8105–2
COPYRIGHT 2003 MARTI ELECTRONICS, INC
12
SR–20C MONOPHONIC OPERATION CONNECTIONS
Refer to Figure 3 as required for the following connections.
1. Connect the receiving antenna coax to the ANTENNA TYPE N port on the rear–panel using a type–N male
connector. A short flexible jumper, 20 inches maximum, may be used between the ANTENNA port and the
Heliax. Marti Part No. 585–017 Double–Shielded, Low–Loss RG–214/U jumper is recommended.
2. Balanced program audio output is located at accessory circuit board connector J2–1 and J2–2 (refer to Figure 2).
The output level can be adjusted from –10 to +11 dBm. Connect shielded audio cable to J2–1 and J2–2. If
unbalanced audio is desired, connect a cable to BNC receptacle J2 on the rear panel.
3. Connect a remote control or subcarrier demodulator to the jack marked, “J1”. The subcarrier load may be 600
to 5K ohms impedance, and the output level is approximately 0.5 Volts peak–to–peak. Systems factory supplied
with 250 KHz IF bandwidth will carry subcarriers up to 110 KHz. For other subcarrier frequencies or narrow IF
bandwidth systems contact the factory. A second subcarrier system can be connected to “J3”. Subcarrier
frequencies may be between 26 KHz and 110 KHz.
4. For dual channel stereo operation, use only Marti MTS–1 coaxial transformer for splitting the received signal to
the two receivers.
CAUTION
IF DC OPERATION IS REQUIRED, DO NOT APPLY MORE THAN +14V
TO THE UNIT.
5. Ensure the receiver rear–panel ON/OFF switch is OFF. Connect the rear–panel AC line receptacle to an 85 to
264V, 47 to 63 Hz AC power source. USE ONLY A 3–PRONG GROUNDED OUTLET RECEPTACLE
FOR SAFETY. The unit can also be operated from a +10V to +14V external dc supply. If dc operation is
required, refer to Figure 2 and connect: 1) the positive wire to J2–13 and 2) ground to J2–14.
6. The receiver is equipped with a rear–panel ground terminal. Connect a ground wire between earth ground and
the GND terminal on the receiver rear panel.
SR–20C COMPOSITE OPERATION CONNECTIONS
1. Connect the receiving antenna coax to the ANTENNA TYPE N port on the rear–panel using a type–N male
connector. A short flexible jumper, 20 inches maximum, may be used between the ANTENNA port and the
Heliax. Marti Part No. 585–017 Double–Shielded, Low–Loss RG–214/U jumper is recommended.
2. Balanced monophonic program audio output is located at accessory circuit board connector J2–1 and J2–2 (refer
to Figure 2). The output level can be adjusted from –10 to +11 dBm. Connect shielded audio cable to J2–1 and
J2–2. If unbalanced audio is desired, connect the cable between J2–1 (audio) and J2–3 (ground).
3. The composite signal output of the receiver is located at J2 on the rear panel. The composite output is con-
nected to the composite signal input of the FM transmitter exciter by a short length of RG–58 coaxial cable.
Connect the cable between J2 COMPOSITE OUT and the composite input on the exciter.
4. A subcarrier demodulator or remote control can be connected to the SUB 1 OUT J1 or SUB 2 OUT J3 BNC
receptacles on the rear panel. The ability of the STL transmitter system to transmit subcarriers depends upon the
channel bandwidth available. The SR–20C receiver IF filter selectivity must be compatible with the available
interference free channel bandwidth. The following text presents the approximate bandwidth required for
various sub carriers using 50 KHz deviation for 100% modulation.
Subcarrier Frequency Receiver IF Bandwidth (3 dB)
67 KHz 234 KHz
92 KHz 284 KHz
110 KHz 320 KHz
13
FIGURE 3. SR–20C SYSTEM DIAGRAM 597–8105–8
COPYRIGHT2003 MARTI ELECTRONICS, INC
14
Actual bandwidth may require an additional 10% to 15% to allow for the modulation on the subcarrier itself.
With severe STL channel crowding with resulting interference prevalent around large markets, subcarriers
above 110 KHz are not recommended.
5. For subcarrier operation, connect a Remote Control or Subcarrier Demodulator to the SU1 OUT J1 or SUB2
OUT J3 BNC connectors on the rear–panel. The subcarrier: 1) impedance may be 600 to 10 K ohms and 2) the
output level is approximately 0.5 Volts peak–to–peak. Subcarrier frequencies may be between 85 kHz and 110
kHz.
CAUTION
IF DC OPERATION IS REQUIRED, DO NOT APPLY MORE THAN +14V
TO THE UNIT.
6. Ensure the receiver rear–panel ON/OFF switch is OFF. Connect the rear–panel AC line receptacle to an 85 to
264V, 47 to 63 Hz AC power source. USE ONLY A 3–PRONG GROUNDED OUTLET RECEPTACLE
FOR SAFETY. The unit can also be operated from a +10V to +14V external dc supply. If dc operation is
required, refer to Figure 2 and connect: 1) the positive wire to J2–13 and 2) ground to J2–14.
7. The receiver is equipped with a rear–panel ground terminal. Connect a ground wire between earth ground and
the GND terminal on the receiver rear panel.
15
ANTENNAS
CAUTION & WARNING
You can be
killed
if an antenna comes in contact with electric
power lines or exposed electrical wiring. For your safety use
extreme caution when installing antennas. Keep away from
power lines.
Personnel must not be near the antenna when radiating. Locate antenna as far as possible from
people and equipment susceptible to RF radiation. Do not mount antenna directly on transmitter.
Refer to ANSI C95.1 “Limits on Non–Ionizing Radiation.”
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