Lindsay LHA Series Manuel utilisateur
LHA Series CATV Distribution Amplifiers
Model Bandwidth Powering
LHA41RM-1GHz (42/54) 5-42 MHz / 54-1000 MHz 90-240VAC
LHA41RM-1GHz (65/85) 5-65 MHz / 85-1000 MHz 90-240VAC
LHA series CATV Distribution Amplifiers with active return are broadband indoor GaAs-PushPull, high output level
distribution amplifiers designed for RF distribution systems such as those in Cable Television Apartments, Hotels,
Hospitals and other applications where a high quality low noise figure amplifier is necessary to amplify the signals in
both the forward and return paths.
The LHA41RM fills out the selection of 1GHz Distribution Amplifiers giving you extra reach and higher output.
Designed with flat operational gain of 41 dB in the forward band and 18 dB in the reverse band. The LHA41RM has
sockets for JXP style plug-in controls, including input pad and equalizer and interstage equalizer for forward bandwidth
for balancing, and input pad plus output pad and equalizer for reverse path balancing.
The amplifiers are self powered and compatible with 117 and 230V systems
FEATURES
• GaAs-Fet Push Pull
for high output
levels with low
distortions
• Active reverse,
• JXP style plug-in
controls,
• RFI housing,
• Surge protection on
all ports,
• Diecast aluminum
housing for heat
dissipation,
• 117/ 230 Volt
powering.
Instruction Manual
LHA Series 1 GHz
SPECIFICATIONS(Typical)
English
Typical, for T = 20degC, Zin = Zout = 75 ohms
Parameter Notes Forward Reverse Units
Bandwidth 54/85-1000 5-42/65 MHz
Technology GaAs GaAs
Min Full Gain 41 18 dB
Flatness +/-1 +/-1 "
Return Loss, IN/OUT -16 -16 "
Test Points, IN/OUT
directional coupler
-20 -20 "
Gain Control
JXP plug-in
in in / out 0 to 20dB, 2dB steps
Slope Control
JXP plug-in
in / mid out
Forward : 3 to 13dB
Reverse: 2 to 10dB in 2dB
steps
Forward Distortions:
40/50dBmV (54/1000MHz) output level, 79 NTSC channels, digital at -6dB after 550MHz
CTB
on ch78
-70 dBc
CSO
on ch78
-72 "
Xmod
on ch2
-73 "
Forward Distortions:
36/46dBmV (54/1000MHz) output level, 79 NTSC channels, digital at -6dB after 550MHz
CTB
on ch78
-83 dBc
CSO
on ch78
-74 "
Xmod
on ch2
-80 "
Reverse Distortions:
52dBmV flat output, 4 ch
3rd on T10 -68 "
2nd on T9 -65 "
Xmod on T10 -64 "
Noise Figure
with 0dB jumpers
6 7 (*) dB
Group Delay
ch2
<40 nsec
41-42MHz
<35 "
5-6MHz
<40 "
Hum Modulation -80 dBc
RFI Isolation -100 "
Surge Withstand
IN / OUT IEEEC62.41 Cat.A3(6kV,200A)
Powering Mains, 90-240 Vac
Power Consumption 15 Watts
Temperature -10 to +55 degC
Enclosure
IP54 Category, Diecast Aluminium
Weight 2.8 (6.2) kg (lb)
Dimensions
21 x 17 x 9 (7-5/8 x 5-3/8 x 3)
cm(in)
LHA41RM_V1 July09
* Noise Figure at 5MHz is max.8dB
WARNING : TO PREVENT SHOCK HAZARD, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.
THIS APPARATUS SHALL NOT BE EXPOSED TO DRIPPING OR SPLASHING AND THAT NO OBJECTS FILLED WITH LIQUIDS,
SUCH AS VASES, SHALL BE PLACED ON THE APPARATUS.
WARNING : THIS PRODUCT IS A CLASS-I CONSTRUCTION. PLEASE ENSURE A CONNECTION TO MAINS SOCKET WITH A
PROTECTIVE EARTHING CONNECTION.
PRECAUTIONS REQUIREMENT
Facilitate service and maintenance Allow a minimum of 35 in.(90 cm) clearance in front of the equipment rack(s)
Avoid direct heating or air conditioning If unavoidable, use deflector plates
AC Power source outlets Locate equipment near sufficient outlets to provide power for test equipment and power tools.
Rack support Make certain rack supports are sufficiently rigid to support rack(s)
Building leakage Beware of dripping water onto equipment from leaky roofs, waveguide roof entries, and cold water pipe condensations.
INSTALLATION PRECAUTIONS TABLE
NO SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL .
REMEMBER TO REPLACE COVER AFTER ADJUSTING
COVER MUST BE IN PLACE FOR CE, SAFETY AND PROTECTION
CAUTION
The exclamation point within an
equilateral triangle is intended to
alert you to the presence of
important operating and
maintenance (servicing)
instructions in the literature
accompanying the product.
The Lightning flash with arrowhead symbol
within an equilateral triangle is intended to
alert you to the presence of uninsulated "
dangerous voltage " within the products
supplementary external power supply
enclosure that may be of sufficient
magnitude to constitute a risk of electrical
shock to persons.
Risk of Electric Shock
Do not Open
NOTE TO CATV SYSTEM INSTALLER
This reminder is provided to call the CATV System Installer’s attention to Article 820-40 of the NEC that provides guidelines for proper
grounding and, in particular, specifies that the cable ground shall be connected to the grounding system of the building, as close to the
point of cable entry as practical.
INSTALLATION AND SETUP GUIDELINES
1. Gain & Cable Slope Controls are reachable under the Cover. Refer to layout scheme for controls adjustment.
2. This product is shipped with default 0dB pad for all plug-in attenuator and equalizers.
3. Before applying power to the amplifier make sure that the forward input level to the amplifier is not too high or damage to
the amplifier might occur. To be on the safe side, you should select the input fixed attenuator to max. value (20dB) before
powering the LHA.
4. Please check that the forward input and mid-stage fixed equalizers are set to 0 dB as factory default values.
5. Now apply power to the amplifier and measure the amplifier forward output level at the 20dB output test point. If it is very
low then adjust the value of input fixed attenuator until the desired output level is reached at the highest operating
frequency. Remember that the level measured at the test point is 20dB lower than the real signal level.
6. Set the forward input equalizer value to adjust the output level to be flat across the full bandwidth. The input signal level
will now be flat too. Under this condition there will be best CNR across the full bandwidth.
7. Now install a plug-in equalizer into the forward mid-stage equalizer socket to get as close as possible to the desired output
signal slope. The desired output slope is determined by your system design. Consult your system planner or your system
maps for this information. Equalizers are available in 2dB steps from 3 to 13dB at 1000MHz. .
8. If you are having trouble obtaining the expected output levels then check the input test point to verify that the levels are as
expected at the input of the amplifier. The forward set up is complete.
9. For the reverse path, inject into the forward output test point test carriers with the system design input signal level +20dB
(because the test point has 20dB loss) at each end of the upstream band.
10. Verify that the upstream reference test point (Note: this is commonly called the “X point” and it is measured at your node, or optical
receiver, or at the 1
st
downstream amplifier. Consult with your system designer) has the proper upstream output signal levels. If it
does not then select the appropriate fixed attenuator and equalizer and install them in the reverse amplifier output sockets.
11. Record the in/out operating levels and the pad and equalizers used in this station.
Block Diagram
English
2LHA41RM_V1 July09
3
Instruction Manual
LHA Series 1 GHz
Ordering Information (LHA41RM-1GHz)
Note
:
All products are factory installed with 1 set of Diplex Filters (DF..),
0dB Attenuator Pads(ATTxx) and 0dB Equalizer Modules (REQL
and EQL, ) on the Reverse and Forward Paths.
Ordering Code for
Accessories Definition
DF6501_1G
Input Diplex Filter Module,
for 65/85MHz version (1GHz)
DF6502_1G
Output Diplex Filter Module,
for 65/85MHz version (1GHz)
DF4201_1G
Input Diplex Filter Module,
for 42/54MHz version (1GHz)
DF4202_1G
Output Diplex Filter Module,
for 42/54MHz version (1GHz)
EQL-1GHz-0xx
Forward Equalizer Module
JXP Style – 1’’
XX: (Value in dB) : 3-5-7-9-11-13
(0dB factory pre-installed)
REQL-42MHz-
0xx
Reverse Equalizer Module for
JXP Style – 1’’
42/54MHz version
XX: (Value in dB) : 2-4-6-8-10 dB
(0dB factory pre-installed)
ATT-xx
Fixed attenuator (JXP style – 0,45’’)
XX: (Value in dB) : 2 to 20dB in 2dB steps
(0dB factory pre-installed)
LHA41RM_V1 July09
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