YDI Wireless A2400S Spread Spectrum Transmission System User Manual Ver2 4

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Date Submitted	2001-07-16 00:00:00
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Version 2.4
July, 2001
LIMITED WARRANTY
Young Design, Inc. (YDI) warrants that your device is free of defects in material and
workmanship for a period of one year after initial purchase. YDI will, in this period of time,
repair or replace, any YDI product returned to the factory, freight prepaid.
The YDI warranty covers repairs or replacement (at YDI’s option) of the product only. YDI is
not responsible for the cost of removal, reinstallation, or shipping to the place of repair. YDI
does not extend or modify its warranty period as a result of repair or replacement.
YDI reserves the right to void a warranty and/or make reasonable charges for repair of a unit if
the warranty seal is broken or the unit displays evidence of misuse, abuse, or tampering.
YDI is not responsible for damage to any other equipment or property, or any other
consequential or incidental damages of any kind, whether based on contract, negligence, or
strict liability. Maximum liability shall not in any case exceed the purchase price of the unit.
Warranties give you (the buyer) specific legal rights. You may also have other rights that vary
from state to state. This warranty is only extended to purchases made in the United States of
America or its possessions.
Warranty Notice
The AMP2440 warranty is null and void if any of the following occurs:
1. The amplifier is opened.
2. The antenna connections are not properly waterproofed.
3. The amplifier is operated with no antenna attached.
4. Improper connectors are used.
5. The amplifier is mounted outdoors with the connectors facing any direction except downwards.
Important FCC Notice
This device complies with part 15 of the FCC rules. Operation is subject to the following
two conditions: (1) This device may not cause harmful interference, and (2) This device
must accept any interference received, including interference that may cause undesired
operation.
© 2000, 2001 Young Design, Inc All Rights Reserved. No part or parts of this document may be reproduced,
translated, stored in any electronic retrieval system, or transmitted, in any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, without the prior written permission Young Design, Inc.
TABLE OF CONTENTS
1. DESCRIPTION ......................................................................................................................................................................... 1
2. AMPLIFIER FEATURES ............................................................................................................................................... 1
2.1 GENERAL SPECIFICATIONS ............................................................................................................................ 2
3. AMPLIFIER KIT ..................................................................................................................................................................... 3
4. INSTALLATION AND CABLING INSTRUCTIONS......................................................................... 3
5. AMPLIFIER CONNECTIONS AND INDICATORS............................................................................. 5
6. DC POWER INJECTOR OPERATION.......................................................................................................... 5
7. DC POWER INJECTOR CONNECTIONS AND INDICATORS ......................................... 6
8. POWER SUPPLY .................................................................................................................................................................. 6
9. OPERATION............................................................................................................................................................................... 7
TABLE A - CONVERSIONS FROM DBM TO WATTS........................................................................ 9
TABLE B - TYPICAL CABLE ATTENUATION VALUES................................................................. 9
APPENDIX A: CALCULATING POWER.........................................................................................................10
APPENDIX B: FCC PART 15 CERTIFIED SYSTEMS.....................................................................11
Professional Installation Required
The amplifier and antennas used must be professionally installed by experienced antenna installation
professionals who are familiar with RF issues (such as gains and losses) as well as local building and safety
codes. Failure to do so will void the product warranty and may expose the end user to excessive Radio
Frequency hazard. Regulations regarding maximum antenna gains, amplifier power gain, and maximum
permissible exposure vary from country to country. It is the responsibility of the end user to operate within
the limits of these regulations and to ensure that the professional installers who install this device are aware
of these regulations. All antennas are intended to be installed outdoors.
1. Description
The AMP2440 is a bi-directional amplifier designed for extending the range of 2.4 GHz wireless
radio modems, Wireless LAN cards, Access Points and wireless bridges. The units provide transmit
power amplification as well as receive signal gain. The amplifier is installed right at the antenna’s
feed point, providing maximum effectiveness of transmit power. This has the effect of
compensating for signal loss in the transmitter cable to the antenna. Likewise, the Low Noise
Amplifier (LNA) in the AMP2440 boosts the receive signal right at the antenna prior to experiencing
the loss in the transmission cable to the radio. This gain completely overcomes the losses in the
transmission cable between the amplifier and the radio. This results in the lowest possible system
Noise Figure. In fact, use of the amp will actually increase the receiver sensitivity by a few dB! The
ultimate result is the best receiver sensitivity and maximum possible range for whatever antenna is
used.
The amplifier box is weatherproof and can be bolted to the antenna mast or tower leg using the Ubolt included. When properly installed, the connectors face down so that gravity will drain all water
away from the amplifier enclosure. This will prevent water from settling on the face of the unit. The
LEDs will also be facing downward so that they can be checked for operation from the bottom of the
mast or tower.
DC Power to the amplifier is supplied through the transmission cable that carries the RF (Radio
Frequency) signal. This DC voltage is put on the coax cable using the DC Power Injector included
in the amplifier kit. Both the amplifier and the DC Injector also contain their own integral lightning
protection as well as DC surge protection. No external antenna lightning protection on the coax
cable is required. (The DC Injector has a grounding stud to facilitate an easy connection to a good
earth ground.) It also has mounting flanges to facilitate permanent installation to a bulkhead or wall.
If mounted to a grounded metal plate, then no extra wiring need to be attached to the grounding
stud. The amplifier box will provide maximum lightning protection when it is bolted to a grounded
mast or tower. No extra ground straps need to be connected to the amplifier case.
2. Amplifier Features
•
•
•
•
•
•
•
•
•
•
•
•
Transmit input levels from 3mW to 100mW
14 dB transmitter power gain (Standard amp)
16 dB receive gain
RX preamp noise figure better then 4 dB (typical)
Weatherproof Cast Aluminum Case that is mast mountable
DC Power for the amp carried up through the transmission cable
Power and Transmit LEDs on both the amp and the DC power injector
Built-in Lightening Protection
DC Surge Protection
Heavy Duty N-type Connectors
One Year Warranty
Made in the U.S.A.
Receiver Low Noise Amplifier (LNA)
2.1 General Specifications
Operating
Range: 2400-2483 MHz
Receive Gain: 16 dB nominal
Freq Response : +/-1 dB over operating range
Operating Bi-directional, half-duplex. Senses RF
Mode: carrier from transmitter and automatically
switches from receive to transmit mode.
Connectors:
Indicators:
Lightning
Protection:
DC Surge
Protection:
Mechanical, Power and Environmental
N-female
Operating
Temperature:
TX and RX LEDs on both the amplifier
and the DC bias injector
Power:
Direct DC ground at antenna connector.
DC injector serves as lightning arrestor if
properly grounded.
Dimensions:
600 Watt TVS at 12 VDC input from
transmission cable
Transmitter Amplifier
Transmit Gain:
Noise Figure: 2.8 dB typical, 3.8 dB max at room temp.
14 dB nominal for standard amp
Mounting Bracket
for amplifier:
(Other versions may have different gains)
Freq
Response: +/-1 dB over operating range
Transmit
Output Power:
Duty Cycle:
Transmit Input
Power to Amp:
Kit Weight:
20°C to +60°C
105-240 VAC if using the power supply
provided with the amp kit
or
11 - 14 VDC @ 900 ma peak, 400 ma avg.
with an alternate power source
Amplifier:
4.5” x 2.6” x 1.2 ”
DC Power injector:
5.4” x 2.4” x 1.3 ”
Accommodates pole/mast diameters from
3/4” to 3”
Approx. 1.5 lb. with U-bolts
250 mW nominal
Up to 640 mW for FHSS radios
Up to 400 mW for DSSS radios
50% Maximum
3mW minimum (+5dBm),
100mW (20 dBm) maximum
(Special versions are available with higher
input power).
Model 2440 Functional Block Diagram
View showing the DC Injector and the pole
mounted outdoor amplifier attached to its
mounting bracket.
3. Amplifier Kit
IMPORTANT:
Only mount the
amplifier with the
connectors facing
downward. Do not
mount it with the
connectors facing
sideways or
upwards.
Each Amplifier Kit Includes:
•
•
•
•
•
Bi-directional remote mounted
amplifier
DC Power Injector
12 VDC, 110/220 VAC Power Supply
Stainless Steel U-Bolts and mounting
bracket for amp
Installation Manual
Close up of the bracket and mounting
hardware attached to the amplifier.
The following options are also available and must be ordered separately:
CAB-DC
Dual-DC
DC-2.1-2.1
DC-2.1-2.5
DC power cable with 2.1mm plug to flying lead 3 feet long. Used when
the customer provides their own 12 VDC power for the DC injector or
amp.
Option to add second power jack on DC injector to enable one 12 VDC
PS that comes with the amp to power both the Injector and the radio or
AP. (Requires a DC jumper cable. See below).
DC jumper cable that connects a radio modem or Access Point to the
second DC power jack on the DC injector box. Radio devices must
have a 2.1 mm ID power jack and operate on 12VDC.
Same as above except used for radios and Access Points that have a
2.5 mm ID barrel jack on them.
4. Installation and Cabling Instructions
FCC Notice
To comply with FCC part 15 rules, the proper version of the amp must only be used in
systems that have been FCC certified. The system must also be professionally installed to
ensure compliance with the Part 15 certification. It is the responsibility of the professional
installer to ensure that certified systems be deployed in the United States (or where FCC
rules apply). The use of the amplifier in any other combination (such as co-located
antennas transmitting the same information) is expressly forbidden in accordance with
FCC rules CFR47 part 15.204. Please visit our web site (www.ydi.com) to see the
systems currently certified by the FCC.
Several key factors unique to their particular installation determine the power level at the input of the
amplifier. The most important consideration is the cable loss in the transmission cable between the
radio and the pole mounted amp. It is important that the installer understand these and other
factors when installing the system.
If you are not familiar with determining power levels within the transmission system, YDI engineers
will assist you in planning your system including selecting the proper cable and antenna required.
SAFETY NOTICE
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment
when installed as directed. This equipment should be installed and operated with fix-mounted
antennas that are installed such that the main lobe(s) of these antennas will have a minimum of 2
meters of separation distance between the antenna and all persons’ body during normal operation.
The amplifier can be mast mounted using the steel U-bolt included with the unit. Refer to the
drawing at the end of the manual for a cabling diagram. In outdoor applications, the amplifier must
be installed with the connectors facing downward. Use an open-end wrench to carefully tighten the
bolts using the included nuts. Take care not to over-tighten the bolts.
Alternately, the amplifier can be mounted to a flat surface using any of the mounting holes on the
brackets mounting flanges. However, for maximum reliability the connectors should be facing
downward.
It is very important to waterproof the RF connectors on the amp. However, it is recommended that
you do not tape the connectors until after all system tests have been performed. Be sure to use a
high quality weather resistant electrical tape and/or other water sealant method. Silicon sealants
are not recommended since they are hard to work with, do not ensure a 100% waterproofing of the
connectors and difficult to remove if ever necessary.
The picture to the left shows the amplifier in typical installation
shown with the YDI Model PT2421 Grid Dish antenna vertically
polarized. The location on the mast where the amplifier is
mounted is not important: provided that the connectors face
downward. (Note that when this picture was taken, the
connectors were not taped yet nor was the cable secured to
the mast.) Also, there is not need to plug or fill any of the
holes on the back of the amplifier enclosure. The housing is
designed such that these holes do not penetrate the inside of
the waterproof seal even though an initial inspection might
make you think otherwise.
If the tower or mast is adequately grounded and the U-bolt
makes good electrical connection to it, then there is no need to
provide additional grounding to the amplifier enclosure.
The DC Power Injector is not in a waterproof enclosure and must be protected from the weather. It
can be permanently mounted to a surface using the mounting flanges. If not mounted to a wellgrounded metal plate or bulkhead, then a separate ground strap will need to connect to the
grounding stud on the Injector.
Refer to the Typical Installation Detail drawing at the end of this manual for more information about
the installation.
5. Amplifier Connections and Indicators
CAUTION: Only use high quality N-type connectors. Do not use PL259 “CB” type UHF
connectors. Doing so will ruin the N-Female jacks and void your warranty.
Transmit LED: This LED glows RED when the amp has switched to the transmit mode. This occurs
when the amp detects RF power at the jack labeled “To DC Injector”. (See Section
9 operation for more information)
Receive LED: This LED glows GREEN in the receive mode when DC power is applied to the
amplifier. It is goes off when; the amp is in the transmitting mode.
DC Injector
Connection: This N-type female connects to the DC Power Injector via the transmission cable.
The length of this cable will determine the type of cable that should be used. See
the installation diagram and the Appendix for more information.
Antenna
Connection: This N-type female connects to the antenna with a short length of low-loss coax
cable.
6. DC Power Injector Operation
A DC Power Injector is an in-line device which “injects” the DC power necessary to operate the
amplifier onto a transmission line. This allows the coax cable to carry both RF signals and DC
power to the mast-mounted amplifier. This precludes the need to run a separate power cable to the
remote mounted amplifier.
When grounded to a good earth ground through either the grounding stud or mounting flange, the
DC Injector will provide maximum lightning protection to your radio modem, wireless LAN card or
Access Point.
7. DC Power Injector Connections and Indicators
Red Transmit LED: This LED glows RED when the pole mounted amplifier goes into transmit
amplification mode. The Remote Transmit LED is controlled by unique
circuitry, which actually detects changes in the DC current traveling through
the transmission line to the amplifier. When you see this LED flash, you will
know that the remote pole amplifier is going into transmit mode.
Green Receive LED: This LED glows GREEN when DC power is applied to the amplifier and it is
in the receive mode. When toggling between transmit and receive this LED
will glow slightly dimmer.
“To Radio”
Connection: This N-type female connects to the radio via a short jumper cable.
“To Amplifier”
Connection: This N-type female connects to the amplifier on the mast using the coax
transmission line.
12 VDC: This is the DC power input for the injector and is a standard 2.1 mm barrel
jack. +12VDC should be applied with center positive.
AUX 12VDC: This jack parallels the 12 VDC jack power jack. It can be used to provide 12
(OPTIONAL) VDC to the radio modem or Access Point using a short DC jumper cable.
Provided that the radio device operates on 12 VDC and draws less then 600
ma, the standard DC power supply that comes with the amplifier kit can be
used to power both it and the amplifier/DC Injector. This extra jack is
installed when the DC-INJ-DUAL option is ordered.
8. Power Supply
The AMP2440 kit comes with a 100 to 240 VAC power supply that has a standard 2.1 mm barrel
plug [center pin positive (+) tip and outer ring negative (-)]. Although normally supplied with a power
supply, any 12 Volt DC, 1 amp (or greater) regulated power supply can be used. The amplifier can
operate from 11 to 14 VDC enabling battery or vehicle operation as well.
The DC power input is diode protected to prevent damage caused by reverse polarity input voltages
as well as by an TVS to protect it and the amp from overvoltage surges.
9. Operation
The unit operates automatically and there are no user adjustments.
The amplifier is only intended for use with 2.4 GHz radio modems that alternate between transmit
and receive in the same radio channel. These are referred to as Time Division Multiplex (TDD)
devices. A typical example is an 802.11 WLAN card or Access Point. These modems “ping-pong”
back and forth between transmit and receive so quickly during normal operation that both the TX
and RX LEDs will appear to be lit simultaneously. In fact they are turning on and off so quickly that
they appear to be on all the time. You can tell the duty cycle one of these LEDs by their brightness.
The amplifier will not work with radio modems or wireless bridges that are band-split true full duplex
devices.
The amplifier provides for linear amplification for transmit output powers up to at least 400 mW. This
is important for Direct Sequence Spread Spectrum (DSSS) radios, especially 802.11 devices. If you
drive the amp so hard as to exceed 400mW output power, the amplifier will start to go into
compression. This will result in raising the sidebands which will result in polluting the adjacent radio
channels.
For Frequency Hopping Spread Spectrum radio devices, versions of the amplifier are available from
the that have the output power limited to 250, 400 or 500 mW as specified in the FCC certified
system. These amplifiers should not be used with DSSS radios since the transmit power limiting
mechanism in the amplifier will cause it to go into compression when their respective clamped
output levels are reached.
8
(CAB-LL )
Drip
Loop
N-female
RF + DC
DC POWER
INJECTOR
12 VDC
Barrel
Plug
DC P.S.
LMR-400 (50 to 100 feet)
LMR-600 (80 to 180 feet)
LMR-900 (120 to 260 feet)
LMR-1200 (150 to 350 feet)
N-female
Barrel Plug
Radio Modem,
Access Point,
WLAN Card, etc
Connector required
by radio
12 VDC
Short length of RG58/U
Optional Jumper Cable
(CAB-DC-2.x)
110/220 VAC
Drawings\diagrams\install-amp-Generic
To Network
YDI can provide all necessary cables,
antennas and accessories. The
professional installer must provide
the mast or pole to mount the
antenna and amplifier
To enable the DC power supply to power both the DC Injector and the radio, the amp kit should be ordered with the
DUAL-DC option along with the appropriate DC Jumper cable.
Mast
Transmission Line
N-female connector
AMP2440 (mounted to mast with U-Bolt)
Omni-directional (shown),
Grid Dish, panel orYagi Antennas (not shown)
ANTENNA
TYPICAL AMPLIFIER INSTALLATION DETAILS
Table A - Conversions from dBm to Watts
dBm
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Watts
1.0 mW
1.3 mW
1.6 mW
2.0 mW
2.5 mW
3.2 mW
4.0 mW
5.0 mW
6 mW
8 mW
10 mW
13 mW
16 mW
20 mW
25 mW
32 mW
40 mW
50 mW
64 mW
80 mW
100 mW
128 mW
160 mW
200 mW
250 mW
320 mW
dBm
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
60
Watts
400 mW
500 mW
640 mW
800 mW
1.0 W
1.3 W
1.6 W
2.0 W
2.5 W
3.0 W
4.0 W
5.0 W
6.0 W
8.0 W
10 W
13 W
16 W
20 W
25 W
32 W
40 W
50 W
64 W
80 W
100 W
1000 W
Table B - Typical Cable Attenuation Values
Cable Type
Attenuation per 100 ft
at 2.4 GHz (dB)
Belden 9913
LMR 200
LMR 240
LMR 400
LMR 600
1/2 “LDF
1/2” Superflex
3/8” LDF
3/8” Superflex
1/4” Superflex
8.0
16.8
12.9
6.9
4.4
3.9
6.1
5.9
6.8
9.8
These values are approximate. Check with cable manufacturers for exact specifications.
APPENDIX A: Calculating Power
This appendix explains how to calculate the input power to the amplifier for your configuration.
1. Using Table A, convert the output power of the radio modem from Watts (or milliWatts) to dBm.
The Model Amp 2440 amplifier works with input powers between 3.2 mW, +5 dBm, and 100 mW
(+20 dBm).
2. Calculate the cable attenuation for your installation.
First, determine the attenuation for the length of your cable at 2.4 GHz. Use the cable
manufacturer’s specifications, or for convenience you may refer to Table B for typical values. (For
example, Table B shows that typical attenuation for LMR-400 is about 6.9 dB per 100 foot at 2.4
GHz.) Then add 0.6 dB to that figure for connector, adaptor cable, and DC injector losses.
3. Calculate the maximum power that can be expected at the amp on the pole:
Radio output (dB) - Cable loss (dB) - Connector Loss =
Signal level at the amp’s input (dBm)
For example, a radio with 40mW (+16 dBm) output and 75 feet of LMR400 (about 3.4 dB of loss)
would have the following input level to the amplifier:
+16 dBm – 3.4 dB – 0.6dB = +10 dBm
Using a standard amplifier with 14 dB of linear transmit power gain, the output power is calculated
as follows:
+10 dBm + 14 dB gain = +24 dBm output power (250 mW)
If the input to the amplifier will exceed +20 dB (100 mW) by your calculations, an attenuator pad will
be necessary between the modem and the DC injector. Or you can order a special version of the
amplifier from YDI that will accept higher transmit input power.
Note: Never put attenuator pads between in the cable the DC injector and the amplifier since there
is a +12V DC voltage on the cable. Doing this would prevent DC power from reaching the
amp and will also damage the attenuator. However, a longer cable or one with higher loss
could be used.
Effective Radiated Power (ERP)
ERP is defined as the sum of the power feeding an antenna and the gain (in dBi) of that antenna.
For example, with 250 mW (+24 dBm) of power into a 24 dBi gain grid dish antenna (like the YDI
PT2424), the ERP would be:
+24 dBm + 24 dB = 48 dBm or 64 watts EIRP
10
APPENDIX B: FCC Part 15 Certified Systems
FCC ID#: NM5-LUC2400E
FCC certified systems consist of:
•
•
•
•
A2440-xxF amplifier, DC Injector and 12 VDC Power supply
Orinoco/Agere WLAN card with the FCC ID#: IMRWLPCE24H
Outdoor Antenna
Coax cable (See table B)
Agere Authorized Antennas
Model
Antenna Type
Max
EIRP
(dBm)
48
MPE Distance
(CM)
Grid Dish Antenna
Antenna
Gain
(dBi)
24
Lucent AOU24-DI-24
YDI PT2424
Grid Dish Antenna
24
48
71
YDI PT2421
Grid Dish Antenna
21
45
50
YDI A2.45FP18
Flat Panel Antenna
18
42
36
YDI A2.45FP15
Flat Panel Antenna
15
39
25
YDI A2.45FP12
Flat Panel Antenna
12
36
20
YDI A2.45FP17
Long Panel Antenna
17
41
32
YDI A2.45FP14
Long Panel Antenna
14
38
23
YDI A2410
Omni Antenna
12
36
20
Lucent AOU24-OD-10
Omni Antenna
10
34
20
YDI A2410
Omni Antenna
10
34
20
YDI A2408
Omni Antenna
33
20
Lucent XE 155845
Omni Antenna
30
20
YDI FP12A
Amplified Flat panel
Antenna
Amplified Flat Panel
Antenna
12
36
32
18
42
36
YDI FP18A
11
71
FCC ID#: NM5-C111E
FCC certified systems consist of:
•
•
•
•
A2440-xxF amplifier, DC Injector and 12 VDC Power supply
Nokia C111 WLAN card with the FCC ID#: ORE-C110-C111
Outdoor Antenna
Coax Cable (See table B)
Nokia Authorized Antennas
Model
Antenna Type
Grid dish Antenna
Antenna
Gain
(dBi)
24
Max
EIRP
(dBm)
48
MPE
Distance
(CM)
71
YDI PT2424
YDI PT2421
Grid dish Antenna
21
45
50
YDI A2.45FP18
Flat Panel Antenna
18
42
36
YDI A2.45FP15
Flat Panel Antenna
15
39
25
YDI A2.45FP12
Flat Panel Antenna
12
36
20
YDI A2.45LP17
Long Panel Antenna
17
41
32
YDI A2.45LP14
Long Panel Antenna
14
38
23
YDI A2412
Omni Antenna
12
36
20
YDI A2410
Omni Antenna
10
34
20
YDI A2408
Omni Antenna
33
20
YDI FP12A
Amplified Flat Panel Antenna
12
36
32
YDI FP18A
Amplified Flat Panel Antenna
18
42
36
12
FCC ID#: A2400S
FCC certified systems consist of:
•
•
•
•
A2440-xxF amplifier, DC Injector and 12 VDC Power supply
Agere WLAN card, PART#: 012699
Outdoor Antenna
Coax cable (See table B)
Agere Short Card Authorized Antennas
Model
Antenna Type
Max
EIRP
(dBm)
48
MPE Distance
(CM)
Grid Dish Antenna
Antenna
Gain
(dBi)
24
Lucent AOU24-DI-24
YDI PT2424
Grid Dish Antenna
24
48
71
YDI PT2421
Grid Dish Antenna
21
45
50
YDI A2.45FP18
Flat Panel Antenna
18
42
36
YDI A2.45FP15
Flat Panel Antenna
15
39
25
YDI A2.45FP12
Flat Panel Antenna
12
36
20
YDI A2.45FP17
Long Panel Antenna
17
41
32
YDI A2.45FP14
Long Panel Antenna
14
38
23
YDI A2410
Omni Antenna
12
36
20
Lucent AOU24-OD-10
Omni Antenna
10
34
20
YDI A2410
Omni Antenna
10
34
20
YDI A2408
Omni Antenna
33
20
Lucent XE 155845
Omni Antenna
30
20
YDI FP12A
Amplified Flat panel
Antenna
Amplified Flat Panel
Antenna
12
36
32
18
42
36
YDI FP18A
13
71
Note:
1.
2.
MPE distance figures are based on a conservative “worst case” prediction, i.e. +24 dBm
into antenna using formula S=EIRP/(4piR2) and no calculation for duty factor. In practice
the minimum distance will be much shorter.
The minimum MPE distance has been calculated for the maximum allowed Power
Density (S) limit os 1.0 mW/cm2 in the Frequency range 1500-100,000 MHz for
uncontrolled environments (Ref.2).
Reference:
1. FCC Part 15, sub-clause 15.247 (b)(4)
2. FCC OET Bulletin 65, edition 97-01
3. FCC Supplement C to OET Bulletin 65, edition 97-01
TABLE B
Authorized Cables with Minimum Lengths
Cable Type
RG58/U
LMR195
LMR200
Minimum Length/Loss
19 Feet/3.4 dB
Max recommended Lengths
40 Feet
20 Feet/ 3.4 dB
50 Feet
LMR240
25 Feet/ 3.3 dB
65 Feet
LMR400
50 Feet/ 3.4 dB
100 Feet
LMR500
60 Feet/ 3.5 dB
140 Feet
LMR600
80 Feet/ 3.5 dB
150 Feet
LMR900
120 Feet/ 3.5 dB
250Feet
LMR1200
150 Feet/3.4 dB
350Feet
LMR1700
200 Feet/3.4 dB
480 Feet
NOTE: This table is for reference only. In order to comply with FCC Part 15 Certification, the
installer must insure that actual coax cable used between the DC injector and the amplifier has at
least 3.3 dB of insertion loss.
CAUTION: If the power output from the amplifier exceeds +24 dBm or the antennas used are in
excess of 24 dBi gain, the FCC regulatory limits specified in Part 15.247 (b)(3)(i) could be
exceeded.
14
To see a complete line of our High Speed
Wireless Data products, visit out web site at:
www.ydi.com
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