Scientific Atlanta | System Amplifier III | MLE300SAT-4xx.25 Mainline Scientific Atlanta System Amp II 1 GHz

1 GHz SASMAX series
MLE300SAT-4**.25 SASMAX High Gain Dual Amplifier
(Legacy “System Amp II” style)
Description:
The 1 GHz SASMAX series broadband high gain dual amplifier is essentially a “drop-in-upgrade” module that
allows the customer to perform system upgrades without suffering extensive construction costs. The revolutionary
MLE300SAT-4**.25 provides better performance and enhanced features at low cost.
The MLE300SAT-4**.25 is designed to re-use the existing power supply, the original amplifier chassis, and fit
into the same System Amplifier series housing as before. The MLE300SAT-4**.25 includes a newly manufactured
state-of-the-art PCB assembly that is installed in the original chassis and fully tested as new. The original power
supply is re-tested and refurbished to ensure years of reliable service.
Features:
 The Industry’s first 1 GHz Scientific Atlanta style high gain dual amplifier that is backwards compatible!
 Low-cost, easy-to-install, drop-in-upgrade unit that fits into existing housing offers increased gain to allow
for existing spacing. Eliminates new construction altogether, or greatly reduces construction costs!
nd
rd
 High performance GaAsFET gain stages deliver Lowest 2 and 3 Order distortions, superior CNR, and
low noise figure, while maintaining highest gain and excellent flatness in both forward & return bands.
 Computer designed, fixed component diplex filters exhibit the highest stop band isolation (>40 dB), the
best return loss (>22 dB), and the lowest insertion loss available (< 0.75 dB).
 Plug and play diplex filters allow quick and low cost changes to both forward & return bands.
 The plug-in AGC module is designed to work with Analog or QAM modulated carriers using a low loss
SAW filter that provides accurate pilot channel selection.
 Improved hum modulation.
 Plug-in fuses and a Crowbar provide surge protection.
 Similar layout and look as the original Scientific Atlanta high gain dual amplifier, is technician friendly, and
will require minimal training.
 Easily configurable in the field. As before, use 2 or 3 active outputs to meet your system requirements.
 Increase your existing modules MTBF and reduce service outages by letting us completely disassemble
and rebuild your existing amplifier. This is not a modification to your existing amplifier! We install newly
manufactured electronic assemblies that upgrade your module in every way.
 High gain dual amplifier module includes a complete 2-year warranty on all installed electronic
assemblies.
MLE300SAT-4**.25 Manual (Rev. 3)
Page
1
SASMAX MLE300SAT-4**.25 Functional Block Diagram
Symbol definations
A
C
Plug In Fuse
-30 dB
SM TP
Hybrid
Amplifier
Splitter/
Combiner
Plug In Pad, filter, roll
corrector
RF Input / Output
Plug In Equalizer
HP
LP
MAIN
A
C
AGC
PAD
Post
Amp
AGC
Controller
Rev Path
Plug In diplex filter
HP
Dir
Coup
Splitter
LP
EQ
-30 dB
TP
Directional Coupler
Forward Path
PAD
LP
AUX
1
HP
HP
RF
IN
A
C
Pre
amp
Input
EQ
PAD
Inter
stage
EQ
EDB
Response
EQ
FRC
LP
BODE
PAD
Pre
amp
-30 dB
TP
Splitter
A
C
-30 dB
TP
-30 dB
TP
Combined
RTN OUT TP
PAD
Post
Amp
Plug-in
Splitter
PAD
-30 dB
TP
Combined
RTN IN TP
LPF
HP
PAD
-30 dB
TP
Return
EQ
RRC
RTN
Amp
AUX
2
LP
Combiner
A
C
PAD
Combiner
PAD
AC Crowbar
SASMAX MLE300SAT-4**.25 Accessory Locations
FWD
Interstage
EQ
Input Port
Diplex Filter
FWD IN/
RTN OUT
Test Point
AUX 2
FWD OUT/
RTN IN
Test Point
FWD Input
Pad
AUX 2
Diplex Filter
FWD Roll
Corrector
FWD
Input EQ
AGC
Switch
MANUAL
Setup Pot
Comb RTN
Output Test
Point
EDB DeBumper
AGC
AC
Crowbar
MLE300SAT-4**.25 Manual (Rev. 3)
RTN Output
Pad
Low Pass
Filter
RTN Roll
Corrector
BODE
RTN
EQ
FWD
Interstage
Pad
DC Test
Point
SM PWR
Plug
Comb RTN
Input Test
Point
AGC
Setup
Pot
AC Test
Point
AUX 1/2
Output Pad
AGC
Setup
Pad
AUX 1
FWD OUT/
RTN IN
Test Point
FWD AUX
Signal
Director
MAIN FWD
Output Pad
MAIN Diplex
Filter
AUX 2
RTN Input
Pad
SM Test
Point
MAIN FWD OUT/
RTN IN
Test Point
AUX 1
Diplex Filter
AUX 1 RTN
Input Pad
MAIN RTN
Input Pad
Page
2
Amplifier Setup
The MLE300SAT-4**.25 high gain dual amplifier provides superior 2-way performance with more Forward and
Return path gain, higher output levels, lower noise figure, better distortion performance, and wider bandwidth than
the original module. The extra bandwidth your system will achieve with this direct drop-in-upgrade module,
assuming no additional amplifiers are cut in, will depend on several loss factors that the improved performance
must compensate for. This includes increased dB losses due to system configuration, taps, the type and length of
coax, that are encountered based upon the original amplifier dB spacing. Although the physical length of the coax
cable span has not increased, the dB losses and the cable dB changes due to temperature at the highest
frequency channels will increase. The amplifier’s extra RF gain and plug-in AGC module will help compensate for
the additional cable loss as the bandwidth increases and temperature changes, the lower noise figure improves
the C/N, and the improved distortion performance increases the channel capacity.
The MLE300SAT-4**.25 has two equal, or three unequal, high-level RF distribution outputs. A plug-in output
port selector lets you choose one or both auxiliary outputs by installing a plug-in jumper or directional coupler. The
RF test points on the input and output ports are bi-directional and provide a -30 dB monitor. Return signals can be
injected at any forward output test point. In addition, there is a combined return input and output -30 dB test point
and each return leg has its own input pad. Each unit accepts a variety of plug-in circuits including an interstage
response EQ (debumper), which can be used as needed to compensate for system imperfections. The plug-in 25amp auto fuses provide AC power to the power supply itself and/or the output ports as needed. There are AC and
DC voltage test points accessible thru the cover as well as a power LED to ensure proper function of the power
supply. A plug-in Crowbar provides surge protection by firing at approximately 230 VAC. The MLE300SAT-4**.25
high gain dual amplifier can be made backward compatible with the Scientific Atlanta System Amplifier series
housing. Before installing the MLE300SAT-4**.25 into the existing housing, replace the seizure screws and anvils
as needed. Please refer to the “System Amplifier Housing Upgrade Instructions” on the MLE300SAT-4**.25
specification sheet listed below.
Setting the MLE300SAT-4**.25 in Manual Mode
The forward operational gain of the MLE300SAT-4**.25 is 43 dB with an output “cable” tilt of 17 dB. The gain is
controlled using a plug-in Input Pad, an Interstage Pad, and two Output Pads for the Main and Aux 1/2 ports
(MP***-0). The tilt is controlled using a plug-in Input EQ and an Interstage EQ (MFA***-0). In addition, the plug-in
AGC module provides a manual gain control as well as an automatic gain control.
1. Ensure the AGC switch is in the Manual position.
2. Connect a signal-level meter to the forward input test point, measure and document the tilt and RF input
level at the highest and lowest system carrier. Note: Both carriers should be at standard analog levels,
non-scrambled.
3. Install the correct Input Pad and Input EQ to achieve the designed input level and tilt. Note: The RF input
level at the highest frequency should not exceed +6.5 dBmV.
4. Connect the signal-level meter to the forward output test point and ensure there is at least 3.0 dB of
reserved gain at the highest system carrier. Adjust the manual gain control if needed. Note: The
MLE300SAT-4**.25 is factory set to have 3.0 dB of reserved gain at 1002 MHz.
5. Measure and document the tilt and RF output level at the highest and lowest system carrier as well as the
pilot carrier.
6. If the RF output level at the highest frequency is too high and the input is padded correctly, install the
correct Interstage Pad and/or the Output Pads for the Main and Aux 1/2 ports accordingly. Note: The RF
output level at the highest frequency should not exceed the maximum operating level of +49.5 dBmV.
7. If the output tilt is less than required, install a higher value Interstage EQ.
8. If the output tilt is greater than required, install a lower value Interstage EQ.
Setting the MLE300SAT-4**.25 in AGC Mode
1. Perform the complete procedure described in “Setting the MLE300SAT-4**.25 in Manual Mode” if not
already completed.
2. Ensure the AGC switch is in the AGC position.
3. Connect the signal-level meter to the forward output test point and measure the RF output level at the
highest system carrier.
4. Adjust the automatic gain control until the RF output level matches the RF output level obtained in
Manual Mode.
MLE300SAT-4**.25 Manual (Rev. 3)
Page 3
Note: The plug-in AGC pad is factory set for an amplifier output level range from +40 dBmV to +50 dBmV at
the pilot frequency. You can change this pad (MGIP-*) depending on the operational output of the
MLE300SAT-4**.25.
Return Path Alignment
The return operational gain of the MLE300SAT-4**.25 is 17.5 dB for both the Main and Aux 1 Ports and 20.5
dB for the Aux 2 Port. The gain is controlled using plug-in Return Input Pads for the Main, Aux 1, and Aux 2 Ports
as well as a Return Output Pad (MP***-0). The tilt is controlled using a plug-in Return EQ (MRN***-0).
1. Set up the return optical link using the design input reference levels for the return transmitter and the
system design output levels of the return path receiver. This must be done before you balance any return
amplifiers.
2. Document what the amplifier’s RF input reference levels are.
3. Use the -30 dB Forward Output/Return Input test point to inject the return carriers or sweep.
4. Verify that the Return Input Pads are all MP000-0 (0 dB).
5. Install the design value Return Output Pad.
6. Install the design value Return EQ.
7. Set the sweep output to the design reference level and set the sweep output for a -30 dB test point.
8. Change the Return Output Pad and/or Return EQ until the swept response matches, as close as
possible, the stored reference sweep taken at the optical node.
9. Document sweep levels used as well as the Return Pads and Return EQ values.
Using Amplifiers In Lower Frequency Systems
When using the MLE300SAT-4**.25 high gain dual amplifier in a 1 GHz distribution system, you must use an
MFA***-0 equalizer. For use in lower frequency systems, such as 750 MHz or 870 MHz, you must consider the
best method for handling the reduced bandwidth and channel-loading requirement. If you use 1 GHz equalizers in
lower frequency systems, you will need to take into account the reduced gain from 1 GHz. Due to the amplifier tilt,
there will be some loss in gain from the published operational gain specification at 1 GHz. Note: Please refer to
the “MFA***-0 Triple Specification Sheet” listed below.
To avoid any additional loss in gain, it is optimal to use the equalizers that match the system frequency. For a
750 MHz system, use 750 MHz equalizers. For an 870 MHz system, use 870 MHz equalizers.
MLE300SAT-4**.25 Manual (Rev. 3)
Page
4
SASMAX HIGH GAIN DUAL ORDERING OPTIONS
S
N
1
2
3
4
5
6
7
8
x
x
x
x
x
x
x
x
9
-
x
10 11 12 13 14 15 16
x
x
U
x
2
x
1
Number of Active Ports
9
Forward Level Control Option
X
X Number of Ports
1
AGC with 427.25 MHz Analog Pilot
2
2 Ports (High Gain Dual Configuration)
3
AGC with 499.25 MHz Analog Pilot
3
3 Ports (Balanced Triple Configuration)
5
AGC with 609 MHz QAM Pilot
6
AGC with 711 MHz QAM Pilot
2-3
Bandwidth
75
750 MHz
10-11
Return Path Operational Gain
87
870 MHz
XX
XX dB
1G
1002 MHz
17
17 dB
4
Diplex Filter Split
12
RF Test Point Location
C
40/51 MHz
U
Access through RF Module Cover
D
40/54 MHz
E
42/54 MHz
13
Housing Option
F
55/70 MHz
H
Station Housing Included
G
65/85 MHz
M
RF Module Only (No Housing)
5-6
Forward Path Operational Gain
14
AC Input Voltage
XX
XX dB
2
60-90 VAC
43
43 dB
15
AC Current Handling
7-8
Forward Path Station Tilt
A
10 Amp Capacity
XX
XX dB
B
15 Amp Capacity
13
13 dB
16
AC Fuse
1
25 Amp Fuses Installed
2
Shunts Installed
x
(AGC Level Control Option)
** Additional options are available, please contact your sales representative.
MLE300SAT-4**.25 Manual (Rev. 3)
Page
5
Standard RF Specifications
Parameter
Pass Band
Amplifier Type
Flatness
Minimum Full Gain (AGC mode)
Units
MHz
dB
dB
Forward
54-1002
GaAsFET PD
+/-0.75
47
Operational Gain (MGC mode)
dB
43
AGC Range @ 1002 MHz
Return Loss (minimum)
Noise Figure (typical)
Test Points
Hum Modulation @ 15 A
dB
dB
dB
dB
dBc
+3.0/-4.0
-16
7.5
-30 (+/-2.0)
-60 (54-750 MHz)
-55 (751-1002 MHz)
AC Bypass Current (continuous)
DC Current Draw (maximum)
Recommended Input Levels
Reference Frequencies
Output Levels
Channel Loading
CTB
CSO (high side)
Cross Modulation
A
15
A
1.70
Distortion Measurements @ Rated Level
dBmV
5.5-6.5 @ 1002 MHz
MHz
1002 / 870 / 750 / 550 / 54
dBmV
49.5 / 48.4 / 47.2 / 45.2 / 36.6
NTSC
78 (CW) with Digital
dBc
-73
dBc
-75
dBc
-68
Reverse
5-40
Silicon
+/-0.5
18.5 (Main & Aux 1)
21.5 (Aux 2)
17.5 (Main & Aux 1)
20.5 (Aux 2)
-16
12.0
-30 (+/-1.5)
-55 (5-10 MHz)
-60 (11-40 MHz)
16.5-17.5 @ 40 MHz
T7-T12
35 (flat out)
6
-85
-86
-70
Notes
1,2
2
3
2
2,4
2
3
5
2
2
2,6
Notes:
1.
Measured with 17 dB of simulated cable.
2.
Measured using an Interstage EQ = MFA140-0, Interstage Pad = MP030-0, Main Output Pad = Factory Selected, Aux 1/2 Output
Pad = Factory Selected, and 0 dB plug-ins for all remaining forward and return locations.
3.
Includes a 1 dB loss from the Input EQ, a 1 dB loss from the Return EQ, and 3.0 dB of Bode slope reserved gain.
4.
The forward Noise Figure is 8.0 dB worst-case and the return is 12.5 dB worst-case over the specified pass band.
5.
Distortions in Manual mode with 78 CW NTSC channels and AWGN Digital loading –6dBc relative to analog carrier levels from 550
MHz to 1002 MHz.
6.
X-mod (@ 15.75 KHz) specified using 100% synchronous modulation.
MLE300SAT-4**.25 Manual (Rev. 3)
Page
6
System Amplifier Housing Upgrade Instructions
Type of Housing
Amp Capacity
SA II, SA II+
10-amps
Follow the upgrade instructions below to convert the System Amplifier Housing from 10-amps to 15-amps.
1. If the seizure screws and anvils are “blue” in color, nothing needs to done.
2. If the seizure screws and anvils are not “blue” in color, replace them by installing the upgrade kit part
number 548775.
Type of Housing
SA III
Nothing needs to be done.
Amp Capacity
15-amps
Accessories
Factory Installed Plug-ins
Diplex Filters (not accessible thru the cover, field upgradeable)
Forward Roll Corrector (not accessible thru the cover, field upgradeable)
Response EQ (Debumper) = 18 AWG buss wire jumper
Interstage EQ = MFA140-0
AGC/MGC Module (Analog Pilots: 427.25 and 499.25 MHz)
Interstage Pad = MP030-0
Main Output Pad = Factory Selected
Aux 1/2 Output Pad = Factory Selected
Aux 1/2 Signal Director = MP000-0
Main, Aux 1, and Aux 2 Return Input Pads = MP000-0
Return Roll Corrector (not accessible thru the cover, field upgradeable)
Low Pass Filter (not accessible thru the cover, field upgradeable)
Fuse 1, Fuse 2, Fuse 3, Fuse 4 = 25 Amp Auto Fuse
230 V AC Crowbar Surge Protector
Required Plug-ins
Input Pad
Input EQ
Return EQ
Return Output Pad
Optional Plug-ins
Plug-in Pads for the AGC/MGC Module
2-Way Splitter
DC-8 Directional Coupler
DC-12 Directional Coupler
Plug-in diplex filter options include 40/51, 42/54, 55/70, 65/85 and 85/105 MHz.
MLE300SAT-4**.25 Manual (Rev. 3)
Plug-in Series
MLE300XDF-01
MLE1202FRC
EDB/*
MFA***-0
MAA4**25R
MP***-0
MP***-0
MP***-0
MP***-0
MP***-0
MLE1202RRC
MLERF100104
0189940-25
MLE300SATCB
Plug-in Series
MP***-0
MFA***-0
MRN***-0
MP***-0
Plug-in Series
MGIP-*
0911055-801
2501158
2501159
-
Page
7
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