Radio Frequency Systems 48710 48710 & 48722 Signal Boosters User Manual INSTRUCTION MANUAL
Radio Frequency Systems Inc 48710 & 48722 Signal Boosters INSTRUCTION MANUAL
Manual
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| Mirror Download [FCC.gov] | |
| Document ID | 160817 |
| Application ID | 80Wp4pKKvcwXFOjO20ZcKw== |
| Document Description | Manual |
| Short Term Confidential | No |
| Permanent Confidential | No |
| Supercede | No |
| Document Type | User Manual |
| Display Format | Adobe Acrobat PDF - pdf |
| Filesize | 54.43kB (680346 bits) |
| Date Submitted | 2001-07-20 00:00:00 |
| Date Available | 2001-09-20 00:00:00 |
| Creation Date | 2001-06-07 19:02:16 |
| Producing Software | Acrobat Distiller 5.0 (Windows) |
| Document Lastmod | 2001-06-07 19:07:04 |
| Document Title | INSTRUCTION MANUAL |
| Document Creator | Acrobat PDFMaker 5.0 for Word |
| Document Author: | Steve Blum |
USERS MANUAL
For
48710 and 48722
Bi-Directional Amplifiers
200 Pondview Drive, Meriden, CT 06450
877 737-9675, Fax 203 821-3852, www.rfsamericas.com
Copyright 1993-Radio Frequency Systems-All rights reserved.
Disclaimer
All information and statements contained herein are accurate to the best of the knowledge of Radio
Frequency Systems, but Radio Frequency Systems does not make any warranty with respect
thereto, including without limitation any results which may be obtained from the products described
herein or the infringement by such products of any proprietary rights of any persons. Use or
application of such information or statements is at the user’s sole risk, without any liability on the
part of Radio Frequency Systems. Nothing herein shall be construed as license of or
recommendation for use which infringes upon any proprietary rights of any person. Product
material and specifications are subject to change without notice. All sales of the products described
herein are subject to Radio Frequency Systems’s standard terms of sale and the specific terms of
any particular sale.
USER’S MANUAL
SERIES 48750 RF REPEATER AMPLIFIERS
TABLE OF CONTENTS
General Statements---------------------------------------------------------------------------------- --------1
MPE Statement ----------------------------------------------------------------------------- 1
Field Alignment Statement --------------------------------------------------------------- 2
FCC and DOC Certification -------------------------------------------------------------- 2
Product Overview ----------------------------------------------------------------------------------- --------3
Theory of Operation ----------------------------------------------------------------------- 3
Block Diagram------------------------------------------------------------------------- 3
Electrical and Mechanical Specifications ----------------------------------------------- 4
Outline of Face Plate------------------------------------------------------------------ 4
Intermod, Output Power and AGC ------------------------------------------------------ 5
Table 1. Typical Output Power------------------------------------------------------ 5
AGC Shut Down --------------------------------------------------------------------------- 6
Manual Gain Control ---------------------------------------------------------------------- 6
AC/DC Power ------------------------------------------------------------------------------ 6
Installation -------------------------------------------------------------------------------------------- --------7
Antenna Isolation -------------------------------------------------------------------------- 8
Troubleshooting, Repair, and Warranty ------------------------------------------------------- --------8
Periodic Maintenance-------------------------------------------------------------------- 10
Service ------------------------------------------------------------------------------------- 10
Warranty----------------------------------------------------------------------------------- 10
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USER’S MANUAL
SERIES 48750 RF REPEATER
GENERAL STATEMENTS
Thank you for selecting this RFS product. We are confident that you will find this product in proper working order,
meeting all stated specifications. If not, please contact customer service immediately 800 321-4700 and we will
resolve the situation without hesitation.
Please take the time to read through this consise manual. A full understanding of the way this product operates will
support optimal performance and prevent accidental damage not covered by the stated warranty. Ninety percent of
installations have no problems at all, it’s the ten percent that cause the frustration.
•
•
•
Under no circumstances should these units be operated without proper loads on both antenna ports.
Either a antenna or a 50 Ohm load, rated for at least 1 watt, must be connected to both antenna ports
before appling power.
These products receive and amplify RF signals in the 800 MHz Cellular Band. As such, these products
are intended for use by the lisencee of the respective service and should not be used without the
expressed permission of the lisencee.
There are no internal adjustments. Do not remove cover except for service. Path manual gain
adjustment access holes are clearly marked in the bottom. Under normal circumstances you need not
make any adjustments. See installation quikguide for more information.
Feeder Cable
50 Ohm
Donor
Antenna
48710
Distribution
Network,
Service
Antenna(s)
50 Ohm.
For distribution network design assistance, contact our field technical support at 800 659-1800.
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USER’S MANUAL
SERIES 48710 RF REPEATER
MAXIMUM PERMISSIBLE EXPOSURE LIMITS
THIS PRODUCT IS CATAGORICALLY EXCLUDED FROM ROUTINE
ENVIRONMENTAL EVALUATION ACCORDING TO CFR 47 SECTION 1.1307.
Repeaters like the 48710 generate radio signals and thereby give rise to electromagnetic
fields. The installer is expected to have a complete understanding of CFR Title 47 sections 1.1307 and
1.1310. A brief discussion follows but is not intended to be a substitute. Additional information can also
be obtained from OET bulliten 65.
ANTENNA INSTALLATION BY QUALIFIED TECHNICAL PERSONNEL ONLY.
INSTALLATION INSTRUCTIONS ARE FOR THE PURPOSE OF SATISFYING FCC RF
EXPOSURE COMPLIANCE AND ARE NOT OPTIONAL.
ALL ANTENNAS (DONOR AND SERVICE) ARE TO BE FIXED MOUNTED AND
PHYSICALLY SECURE TO ONE LOCATION.
MAXIMUM DONOR ANTENNA GAIN 28 DB
NON-BUILDING MOUNTED DONOR ANTENNAS MUST BE GREATER THEN 10
METERS ABOVE GROUND.
MAXIMUM SERVICE AREA ANTENNA ERP IS 1.0 WATT
MINIMUM SEPARATION TO ANY BODY PART OF ANY PERSON IS 25 CM
There are two types of antennas attached to the 48710. The donor antenna is typically roof mounted and
service antennas are typically mounted in publically assesable areas. All of the antennas are fixed
mounted. Installation considerations for both of these will be discussed separately.
Donor antennas receive the Base site TX signals and transmit the mobile TX signals (806-824 and 896902 MHz) back to the base site (uplink path). These are typically mounted on roof tops or tower
structures. The maximum composite power of the 48710 uplink path is 1.0 W (+30 dBm). Section 1.307
(b) (1) excludes from routine environmental evaluation facilities, operations, and transmitters that,
according to table 1 “Cellular Radiotelephone Service”, are less then 1000 W ERP for building mounted
antennas and less then 1000 W and greater then 10 meters above ground for non-builidng mounted
antennas. As such, with a maximum power from the 48710 uplink path of 1.0 W (+30 dBm) and a
maximum antenna gain of 28 dB, the donor antenna installation will not exceed 1000 Watts (+60 dBm)
and is catagorically exlcuded.
However, according to section 1.1307 (b) (1), the appropriate exposure limits of 1.1310 are applicable to
all facilities, operations, and transmitters. As such, the MPE (maximum permissable exposure) of section
1.1310 apply to the donor antenna installation. OET Bulliten 65 provides some methods of calculating
the power density based upon the ERP and distance. It would be impossible to cover every possible
configuration in this manual. Likewise it would be unreasonable to dictate the exact parameters for every
installation. As mentioned in the beginning of this section, it is the responsibility of the installer to know
and assure that sections 1.1307 and 1.1310 are being met.
The following is a typical installation senario for the donor antenna. Assuming a roof top installation and
that the area is uncontrolled/ general population (worse case), the MPE at 824 MHz is .549 mW per cm2.
A higher level is specified for controlled areas in 1.1310 table 1 (A). Using a 10 dB gain yagi antenna
(typical in about 80% of installations) and assuming the uplink is being driven to its maximum output
power (+30 dBm), the resultant ERP is +40 dBm or 10,000 mW. OET Bulliten 65 provides the formula
below for calculating the power density with the EPA reccomended factor for ground reflection:
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USER’S MANUAL
1.05 ERP / π R2
SERIES 48750 RF REPEATER
Where R is the distance to center (any body part of person)
Solving for 10,000 mW at 3 ft. (91.44 cm) we get a power density of .4 mW per cm2.
The yagi antenna in this senario must be mounted in such a way that no body part of any person may
come closer then 3 feet in the direction of the main power beam. This will limit exposure to well within
th e M P E .
Service antennas are also fixed mounted and covered by the same MPE considerations as the donor
antenna. However, it can be assumed that the area is always general population/uncontrolled and that the
minimum distance in most installations will be less then 3 feet. According to table 1 (B) of section
1.1310, the MPE for power density at 894 MHz is .596 mW / cm2. The maximum power out of the
48710 on the downlink (base to service area) is +30 dBm (1000 mW). Assuming no feeder able loss and
a service area antenna gain of 0 dB, a safe minimum seperation of 25 cm (10 inches) is required to stay
within the MPE.
1.05 x 1000 mW / 3.14 x 252 = 1050 / 1962.5 = .535 mW / cm2
Thus, the service area antennas should be mounted such that a no body parts of any person may come
closer that 25 cm. The service area antenna gain is 0 dB in the example above but may be increased to
make up for cable and/or splitter or tap losses. For example; if a 2 way splitter is used to provide for two
antennas in different parts of the service area, then the antenna gain may be increased to 3 dB to make up
for the loss of the spliter 3.6 dB. The maximum service area antenna gain for any specific location can be
calculated by: 0 dB + accumulated losses to the antenna.
FIELD TUNE-UP, ALIGNMENT OR CALIBRATION
The 48710 series repeaters are aligned and calibrated at the time of manufacture. These units are
designed to retain this calibration for the useful life of the product. There is no field tune-up or alignment
necessary.
FCC ID AND CANADA CERTIFICATION NUMBERS
The listed models have been tested and granted Certification by the FCC in accordance with Title 47,
Part 90, and have been granted Certification by the DOC in accordance with RS 131, Issue 131.
The FCC identification number for each particular model appears on a label on the face plate of the
units. Applicable FCC Identification and Canadian ISC Numbers are shown.
FCC ID Number
IWD48710
CANADA
XXXXXXX
PRODUCT OVERVIEW
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SERIES 48710 RF REPEATER
THEORY OF OPERATION
The 48710 series signal boosters are designed to enhance radio communications in buildings, basements,
tunnels and other RF shielded environments. The 48710 is tuned for the 800 MHz SMR band and the
48722 is tuned for the 900 MHz SMR band.
These units work by receiving and amplifying the Base TX signals via a donor antenna directed at the
desired base site. This RF path is called the ‘downlink”. The amplified base TX signal is re-radiated via
antenna(s) or radiating cable into the “Service Area”. Subscriber mobile RF signals are received by the
same service area radiating elements, amplified in the “uplink”RF path to be radiated back to the base via
the donor antenna.
The LNAs and Power Amplifiers are broadband. The same models are used for the uplink and
downlink on both the 48710 and 48722. Likewise, the control board is the same for both models.
Differentation is provided by the duplexing filters on the base and service area connectors that determine
the basic pass band and direct the RF signals to the proper gain path, uplink and downlink respectively.
Both links have automatic gain control (AGC) in the power amplifiers to prevent overdrive. Manual
gain adjustment is provided in the LNA stage. Overdrive limiting is provided by the AGC circuitry and
set at the factory and so that the 48710 series will not exceed the FCC limits for spurious emissions
The control board distributes DC power to the amplifier modules and monitors each module for any
fault condition. LED indicators provide visual diagnostics while the 15 pin din connector has DC and
TTL test points for more in depth trouble shooting.
Block Diagram
Uplink
48710 806-824 MHz
48722 896-902 MHz
PA80-9942
Base
LNA80-0002
Downlink
48710 851-869 MHz
48722 935-941 MHz
LNA80-0002
PA80-9942
Service
Duplexers
48710 5595
48722 J09020
Control Board
ELECTRICAL SPECIFICATIONS
48710 Frequency, MHz
48722 Frequency, MHz
Downlink
Uplink
8 5 1 -8 6 9
9 3 5 -9 4 1
8 0 6 -8 2 4
8 9 6 -9 0 1
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USER’S MANUAL
Gain, no Attenuation,
Gain Flatness, Typ.
Manual Attenuator Range
Output Limiter Range, automatic*
Noise Figure, Typ.**
Composite Power, Typ.*
iDEN, CDMA Typ.
SERIES 48750 RF REPEATER
80 dB
±1 .0 d B
15 dB
20 dB
2 .0 d B
+30 dBm
+27 dBm
80 dB
± 1 .0 d B
15 dB
20 dB
2 .0 d B
+30 dBm
+27 dBm
Impedance, both ports
50 Ohms
VSWR, input, both ports
1 .5
Propagation Delay, worst case at band edge
< 3.0 microsecond
Power , 120/220 Auto ranging, IEC-320 Socket
120 VAC @ 1.5 A
*AGC circuitry monitors the output power and reduces the gain to prevent overdrive or oscillation.
** No attenuation and room temperature
MECHANICAL/ENVIRONMENTAL SPECIFICATIONS
Connectors, RF
Weight
Size L X W X D, wall mount, 36 lbs
Mounting Centers
Diagnostics
Operating Temperature, ambient
Humidity
Environmental Rating
N Female
3 3 l b s (1 6 . 2 k g )
13.5 X 18.5 X 7.3 (34.3 x 47 x 18.5 cm) Inches
10.75 x 17.40 (27.3 x 44.2 cm) Inches
15 Pin Din Connector
-30 to +50° C
Relative up to 95% (non condensing)
Similar to Nema 3R
INTERMOD, POWER , AND AGC
A requirement exists within 47 CFR 90, regarding emissions outside of any particular channel of
operation. As a general rule, there shall be no spurious emissions greater than {43 + 10 Log10 (Power
Out watts)} dB below the carrier Power Out (dB) level. This is always equivalent to -13 dBm.
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USER’S MANUAL
SERIES 48710 RF REPEATER
The primary contributor to spurious emission is multiple signal intermodulation. As multiple signals are
amplified, intermodulation products (IM) are generated. The level of the IM is a factor of the amplifiers
linearity or 3rd Order Intercept Point (IP3) and the number and power of signals being amplified (Pout).
IM = 3xPout - 2xIP3
Pout is the combined power of all the signals in the pass band known as the “composite power”. Radio
Frequency Systems has designed the 48710 repeaters using a combination of low distortion amplifiers and
automatic gain control (AGC) to achieve maximum output while automatically limiting spurious
intermodulation levels to -13 dBm or less for any number/power combination of signals.
The AGC circuitry is housed in each power amplifier stage. A detector on the output of the amplifer
provides a DC voltage proportional to the output power. This voltage is compared to a factory setting.
As long as this voltage is less then the setting no action is required. However, when the combination of
signal level and/or number of signals causes the composite power to exceed the safe level, the AGC’s
comparator generates a DC voltage to a pin diode attenuator that increase attenuation in proportion to the
level of the DC voltage.
The attenuation reduces the output power until the detector voltage is at the safe level again. If the
number or power of the signals is reduced the DC offset voltage will reduce level of attenuation. In
typical operation, the AGC is only active when needed to prevent overdrive. If the AGC is constantly
activating it is suggested that you reduce the gain via the manual attenuator and check to make sure that
an oscillation between the base and service area antenna systems does not exist.
AGC in the uplink is rarely needed in modern radio installations. As a portable comes closer to the
internal antenna network its signal becomes stronger to the base site. Typically, the dynamic power
control at the base will turn the portable’s power down to reduce interference and conserve power.
Overdrive is more likely to occur on the downlink path. All active signals at the donor base site will be
amplified by the repeater regardless of whether they are in use in the service area or not. Ideally, the
donor antenna is directional. This limits the number of donor base sites the repeater sees and reduces the
potential for interference. Observing the signal levels before connecting the repeater is reccomended.
Out of band signals can also cause overdrive. The most likely occurance of overdrive is oscilation from
inadaquate antenna isolation.
Table 4 lists the typical output power per signal which can be expected from the 48710 for a given
number of active signal operating at equal input levels. For a donor site that has 16 signals, the full power
per signal would be +14 dBm. Assuming the incoming signal is sufficient such that that level will be
achieved.
TABLE 1. TYPICAL OUTPUT POWER PER SIGNAL
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USER’S MANUAL
N um berof
Signals
16
32
64
dBm
30.0
26.0
22.0
18.0
14.0
10.0
6.5
SERIES 48750 RF REPEATER
mW
1000
398
160
63
25
10
In all cases the actual signal output power is equal to the input signal power plus the gain of the repeater.
If a signal level of –80 dBm is at the input to the repeater and the gain is 80 dB, the resultant output will
be 0 dBm, not +14 as in the above discussion. + 14 dBm in this case is the maximum. So, if the
incoming signal is –60 and the gain set for 80 dB, the output would not be +20 dBm with 16
simultaneaous signals, the AGC would reduce the gain to 76 dB and the output to +14 dBm per signal.
AGC AUTOMATIC SHUTDOWN
When the automatic gain control circuit reaches its limit (20 dB), the power amplifier stage is shut down
to prevent harmful distortion and potential damage to the repeater. Shutdown will only occur if the AGC
control limit is exceeeded for about a half second. Power is then cut for 2 seconds. After this time-out,
power is brought back on-line. If the overload condition is still present, shutdown will again occur in
about 1 second. This cycle will be repeated until the condition causing AGC to reach its limit is removed.
Conditions which can cause AGC to reach its limit include the presence of one or more very strong
channels, a strong in-band noise source, or amplifier oscillation due to inadaquate antenna isolation.
MANUAL GAIN ADJUSTMENT
The independent manual attenuators, RX for uplink and TX for downlink, are accessable from the bottom
of the unit. They are set fully counter clock wise, at min attenuation – max gain. Manual attenuation is
separate from the AGC so these attenuators can be used to reduce overdrive while maintaining the AGC
range. At fully clockwise, 20 dB of attenuation will be introduced in the respective gain path.
AC / DC POWER
AC power is supplied through a standard 3-wire male plug connected through a standard IEC-320 plug.
Connect this plug to any standard 3-wire 120 VAC outlet. A 5 x 20 mm, 3.15 amp fast blow fuse is used
to cut power in the event of a severe AC fault. A 5 amp mini ATO fuse is used between the 28 VDC from
the power supply and the control board which distributes the power to all components. This is located on
the control board.
WARNING: ALWAYS REMOVE POWER BEFORE CHECKING OR CHANGING FUSES. 120
VAC can be lethal. Always unplug the amplifier before servicing the interior. Never insert conductive
objects into any opening. Do not remove or probe under the plastic safety cover over the AC terminals
of the 28 VDC power supply. Always use a standard 3-wire electrical outlet with safety ground for AC
power.
INSTALLATION
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SERIES 48710 RF REPEATER
Do not apply power until antennas have been connected to both the base and service area ports
Choosing a location for the 48710 to reside is often dictated by circumstance. These units can
withstand a wide range of environmental conditions but a cooler environment will increase the life of
the product. The 48710 and 48722 are not intended for outdoor operation without protection. A
outdoor version suffix “A” is designed for that purpose. A central location is desired to provide
sementry in the distribution network. Further, stacking room near a riser for easy access to the roof
and other floors is desired. However, access to clean 110 VAC power is the only requirement.
Install directional donor antenna and aligned with desired base site.
Yagis, corner reflectors, and panel antennas work the best. Usually, the more directive the better.
The 48710 has sufficiniet filtering to prevent undesired signals from causing interference, however, it
is best to reduce the chance for interfernece by directing the mobile signals only towards the desired
donor base site.
Check the incoming signal before connecting. The 48710 will work with a wide range of RF input
signal levels. Ideal levels on the down link are in the range of –70 dBm. These levels will provide
the maximum output power while not causing significant ovedrive. Also check for extremely strong
out of band signals. These may overdrive the filtering and cause gain reduction.
Connect the donor antenna to the 48710 via 50 ohm coaxial cable.
Size and type of cable are a matter of choice. Typically ½” Flexwell foam coax is used, plenum rated
for inside buildings and work areas. However, 7/8” cable may be used to reduce the longitudinal loss.
Superflex cables are easier to install but have higher longitudinal loss.
Install service area antenna(s).
Determine the location and type of service area antennas is part of the distribution system design.
Generally it is desired to minimize the amount of coax that has to be installed. However, in buildings
with extensive obstructions it may be neccesary to install several service area antennas For assistance
with antenna placement contact RFS Applications Engineering. Observe MPE cautions when
determining the type and location of all antennas!
Connect service antenna(s) via 50 ohm coaxial cable
Multiple service area antenna(s)/radiating cable runs may be connected the 48710. Splitters and taps
may be used to accommodate unique distribution systems. RFS has all the components needed to
complete even the largest installations. See our Web Catalog at www.rfsworld.com or call us.
Mount the 48710 Repeater upright, make sure there is sufficient space above and below the unit to
allow air to flow through the heat sink. Check to make sure the AC power cord can reach the power
source. Also provide adaquate bending room for the coxial cable.
Connect 50 ohm cables – donor antenna to “Base”, service antenna(s) to “Service”
Connect AC power to the 48710 and observe power and fault leds. The PM700-10 comes with each
unit. This connects to the 15 pin diagnotics din on the bottom of the unit either directly or via the 10
foot extension cable. The PM700-10 provides LED readouts of the PINs as explained in the
diagnostics/troubleshooting section. PIN outputs are TTL and DCV so a DVM can be used to
troubleshoot if needed.
Nintey percent of installations are trouble free. The typical problem with the other ten percent is the
signal is too weak or too strong on the downlink. See troubleshooting section for more information
A test of the installation should include multiple subscribers in various locations in the service area with
one subscriber always in the closest proximity to the repeater that will normally be allowed. This will
check to make sure that a close-in user does not overdrive the uplink and reduce coverage for other
users.
If there is an overdrive in either the up or down link, reduce path gain via the manual attenuator. Rotate
clockwise until the AGC overdrive indicator goes out.
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SERIES 48750 RF REPEATER
ANTENNA ISOLATION
ISOLATION BETWEEEN THE DONOR (BASE) ANTENNA AND SERVICE AREA ANTENNA
SHOULD BE 20 dB GREATER THAN THE GAIN OF THE REPEATER AMPLIFIER. If the isolation
is less than the amplifier gain, then positive feedback sufficient for oscillation is present in the system.
Such oscillations will overdrive one or both amplifier chains and continuously activate the AGC
auto-shutdown circuitry. This situation will be apparent by the Red Fault LED lighting up and then
quickly off every 2 seconds.
Antenna isolation is usally not a problem for in-building installations. Isolation is improved by using a
directive donor antenna and facing it away from the distribution or service antenna(s). Decoupling is
achieved by spatially separating the antennas vertically and/or horizontally. Other factors influencing
isolation include multi-path reflections, structures, other antennas, passing vehicles, personnel proximity,
etc. See applications engineering for assistance
It is always best to measure the isolation before connecting the repeater. The most direct way to measure
the isolation is to inject a known signal into one antenna, and measure the coupled signal at the other
antenna. This should be done across the applicable bandwidth to account for the frequency dependency
of standing waves.
DIAGNOSTICS / TROUBLESHOOTING
Green power LED not lit.
Check power source and the the AC fuse located in the EIC plug. Check for DC voltage. Is is rare that
the DC fuse will blow and most likely indicates a short of some kind in the repeater. The DC fuse is
accesable inside the unit. The Mini ATO 5 amp is a readily available fuse. It can be replaced, however, if
the fuse blows again, the unit should be return for service.
Green power LED lit and no Red Fault LED
If the green LED is on but the unit does not appear to be working, the mostly likely senario is a break in
the donor or distribution networks. First check both RF paths output via the DC voltages on Pins 12 and
13 or the RX DET.V and Tx DET. V from the PM700.
Also check to make sure that the donor signal is still available to the repeater, obstruction is blocking the
donor base site or the donor antenna has become misaligned. Then check the integrity of the distribution
network. Coaxial cable has a minimum bending radius, if that is exceeded the inner conductor may crack
or break causing excessive reflections to the signals.
Checking for DC Voltage
DC Voltage can be check via the 15 pin test port. Pins 10 and 11 are the DC voltage associated with the
AGC circuitry, there should be at least 7 volts to ground - pin 14. Or plug the PM700 monitor into the
test port and measure the RXAGCV to ground.
The Red LED indicates a summary fault from any of the fault conditions identified in the Test Points
section. Specific action is describe in that section.
TEST POINTS
The D-sub connector is located on the bottom of the unit. The PM700 performance monitor will provide
visual readout or a DC VOM can be used to quickly assess the health of the 48710. The following is the
D-sub pin-out with troubleshooting suggestions: Looking at the Din connector from the bottom of the
unit, pin numbering starts upper right and proceeds right to left top to bottom.
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USER’S MANUAL
1.
2.
3.
4.
5.
6.
7.
8.
9.
10
11
12
13
14
15
SERIES 48710 RF REPEATER
RX LNA Alarm, logic, low = fault
TX LNA Alarm, logic, low = fault
–not used
–not used
RX PA Alarm, logic, low = fault
TX PA Alarm, logic, low = fault
Conditions 1 – 6. Remove and replace the faulty component or send the repeater back for repair.
Temperature Alarm >+85° C, logic, low = fault
Check for proper airflow past heat sink. If this fails, send unit in for repair.
AGC Alarm, logic, low = fault
Indicates overdrive. See AGC section
Disable (input), logic, high = disable
Remote disable feature. Connecting pin 15 to this pin will disable the 48710.
Rx AGC Voltage, analog, no AGC approx. 26.5VDC, Full AGC approx. 7.65VDC
TX AGC Voltage, analog, no AGC approx. 26.5VDC, Full AGC approx. 7.65VDC
Pins 10 and 11 provide indication of the amount of AGC attenuation. Full AGC indicates strong
drive signal or possible oscillation and should be avoided. Check drive levels and antenna
isolation. Reduce manual gain to relax AGC level if needed.
RX Drive Voltage, analog, approx. 0 to 3VDC @ approx. 0.3VDC per dB
TX Drive Voltage, analog, approx. 0 to 3VDC @ approx. 0.3VDC per dB
Pins 12 and 13 provide a DC voltage that represents the output power of the respective path.
These levels can be used to determine if there is signal present when a signal meter is not
available.
Ground for Pins 10,11,12,13.
+5VDC, thermally fused (self-resetting), 50mA max.
Pin 15 can be used as the drive voltage to disable the unit on Pin 9. It is also used to power the
PM700-10 performance monitor.
MAINTENANCE, REPAIR, AND WARRANTY
PERIODIC MAINTENANCE
There is no maintenance for the 48710. As long as the amplifiers are kept away from extreme
temperatures and moisture, the amplifier should provide long-term, care-free operation.
However, as a system periodically check all RF connections for corrosion, strain damage, and tightness
and periodically check the AC power connections for integrity.
ORDERING & RETURNING COMPONENTS
For technical assistance call Radio Frequency Systems Sales Engineering at 1-800-659-1880.
For returns, repairs and ordering, contact Radio Frequency Systems Customer Service at
1-800-321-4700 (602 252-8058 for Latin America) for a Return Authorization Number. Be prepared to
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USER’S MANUAL
SERIES 48750 RF REPEATER
provide the model number and serial number of the unit as well as a description of the symptoms of the
problem.
Send components or units freight-paid with the Return Authorization Number on the outside of the
package to:
Radio Frequency Systems
4100 S.W. Research Way
Corvallis, Oregon 97333
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 within two years from date of shipment. No material is accepted
for replacement or repair without written authority of the Seller. Replacement or repair is made only after
an examination at the Seller's plant shows defective material or workmanship at the time of manufacture.
All shipping charges on the returned material must be prepaid by the Buyer.
The Seller is in no event liable for consequential damages, installation costs or other costs of any nature
as a result of the use of the products manufactured by the Seller, whether used in accordance with
instructions or not. The Seller is not liable for replacement of any product damaged by lightning.
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 the Seller's
products.
10Dwg 602300003500/Rev.1
10
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