Mudel Down Converter And Multicoupler Manuals

Mudel Down Converter And Multicoupler Manuals
Mudel
Down Converter
And
Multicoupler Manuals
Mudel
Low L-Band
Down Converter
MDC-1415-2C/17
Page 1
MU-DEL ELECTRONICS, INC.
TABLE OF CONTENTS
Paragraph
I.
Page
Introduction ......................................................................................................3
1.1
1.1.1
1.1.2
1.2
1.2.1
1.2.2
1.3
1.3.1
1.3.2
General Description.......................................................................................3
Physical Characteristics .............................................................................3
Functional Characteristics ..........................................................................3
Specifications. ...............................................................................................3
Electrical Specifications..............................................................................3
Mechanical Specifications ..........................................................................4
Equipment Required......................................................................................5
Equipment Supplied ...................................................................................5
Test Equipment ..........................................................................................5
II. Installation .........................................................................................................6
2.1
2.2
2.3
Unpacking .....................................................................................................6
Mounting .......................................................................................................6
Preparation for Reshipment ..........................................................................6
III. Operation ..........................................................................................................7
3.1
3.2
3.3
3.3.1
3.3.2
3.3.3
Instruction......................................................................................................7
Controls and Indicators .................................................................................7
Operating Procedures ...................................................................................7
Turn-on.......................................................................................................7
Operation ...................................................................................................7
Turn-off.......................................................................................................7
IV. Theory of Operation .........................................................................................8
4.1
4.2
Overall Functional Description.......................................................................8
Subsystem and Component Description .......................................................8
MDC-1415-2C/17
MU-DEL ELECTRONICS, INC.
Page 2
4.2.1
4.2.2
4.2.3
RF Amplifier A11, A21................................................................................8
RF Bandpass Filter FL11, FL21 .................................................................8
Mixer M11, M21..........................................................................................8
4.2.4
4.2.5
4.2.6
4.2.7
4.2.8
4.2.9
4.2.10
IF Bandpass Filter FL12, FL22 ...................................................................9
IF Amplifier A12, A22 .................................................................................9
Reference Oscillator A2 .............................................................................9
Local Oscillator A1 .....................................................................................9
L.O. Amplifier A4 ........................................................................................10
Power Divider A5........................................................................................10
Power Supply (+15 VDC) A3 .....................................................................10
V.
Parts List..........................................................................................................11
VI. Illustrations
Title
Figure
Block Diagram .........................................................................................................6-1
Schematic Diagram, RF Amplifier, 1435 - 1540 MHz .............................................6-2
Schematic Diagram, IF Amplifier, 215 - 320 MHz ..................................................6-3
Schematic Diagram, L.O. Amplifier, 1220 MHz ......................................................6-4
Page 3
MU-DEL ELECTRONICS, INC.
MDC-1415-2C/17
SECTION I
INTRODUCTION
1.1 GENERAL DESCRIPTION
1.1.1 PHYSICAL CHARACTERISTICS
The Down Converter Model MDC-1415-2C/17 is a dual channel unit. It is housed in a
standard rack mountable chassis of 1¾ " H X 19" W X 17" D. All connectors, fuses and
power receptacle are located on the rear apron of the unit. The Power Switch/Indicator, the
Local Oscillator lock loss LED indicator and the Channel Gain Controls are all located on
the front panel. The handles on the front panel facilitate ease of installation and removal.
For installation stability slides are provided on the side of the unit. Modular construction
techniques are used and the active circuits are entirely solid-state.
1.1.2 FUNCTIONAL CHARACTERISTICS
The Model MDC-1415-2C/17 is an L-Band, fixed tuned dual channel radio frequency Down
Converter. Each channel independently can receive signals in the 1435 - 1540 MHz range
at the" RF IN" connector (J1) and convert them to frequencies in the 215 - 320 MHz range
at the “IF OUT” connector (J2). Each channel has an individual gain control located on the
front panel.
Both channels share a common local Oscillator. The local oscillator
frequencies are phase-locked to an internal 10 MHz reference oscillator.
DANGER !
REMOVE POWER PLUG BEFORE ATTEMPTING
TO GAIN ACCESS TO INSIDE OF UNIT
1.2 SPECIFICATIONS
1.2.1 ELECTRICAL SPECIFICATIONS
Frequency Range Input:
1435 - 1540 MHz
Frequency Range Output:
215 - 320 MHz
Gain (adjustable):
0 to + 35 dB
Noise Figure:
7 dB max.
MDC-1415-2C/17
Page 4
MU-DEL ELECTRONICS, INC.
Input VSWR:
1.5 : 1 max.
Output VSWR:
1.5 : 1 max.
Output Level @ 1dB Gain Compression:
0 dBm min.
Channel to Channel Isolation:
60 dB min.
Frequency Stability:
± 5 x 10
Third Order Intermodulation:
-50 dBc min. at two
Inputs signal -20 dBm
each 1 MHz apart.
Image & IF Rejection:
60 dB min.
Impedance, Input and Output:
50 ohms
Number of RF Inputs:
Two (2)
Number of RF Outputs:
Two (2)
Power Requirements:
90-260 VAC,
47 - 440 Hz
-7
ppm per day
1.2.2 MECHANICAL SPECIFICATIONS
Connectors, RF:
Input:
Output:
N female
BNC female
Size:
1¾ "H X 19"W X 17"D
Weight:
10 lbs. (Slides excluded)
Finish:
Light Gray, Color #26440
FED STD 595; engraved
lettering, black filled
MDC-1415-2C/17
MU-DEL ELECTRONICS, INC.
Page 5
1.3 EQUIPMENT REQUIRED
1.3.1 EQUIPMENT SUPPLIED
* One Dual-Channel Down Converter Assembly,
Mu-Del Model: MDC-1415-2C/17
* One Technical Manual
* One Standard Three-Prong Power Cord
1.3.2 TEST EQUIPMENT
The following equipment is required for troubleshooting, repair and alignment procedures:
Signal Generator
Sweep Generator
Power Meter
Oscilloscope
Spectrum Analyzer
Directional Coupler
Frequency Counter
Detector
Digital Voltmeter
MDC-1415-2C/17
MU-DEL ELECTRONICS, INC.
Page 6
SECTION II
INSTALLATION
2.1 UNPACKING
Before unpacking equipment, examine package(s) for evidence of transportation mishandling
or damage. If damage is evident, the equipment should be unpacked and inspected
immediately to detect any shipping damage. Notify the carrier if the equipment is damaged.
Normally, the equipment should not be unpacked until ready for installation. Carefully open
containers and remove packing material with care. Empty containers and packing material
should be searched for additional accessories and then stored for future use.
2.2 MOUNTING
The chassis is designed for mounting in a standard 19-inch rack. Slides provided with the
unit are to be mounted to the rack for better stability. When the unit is fully mounted, the
power cord can now be connected on the rear apron and then plugged into the AC line.
After the RF input and output connections are completed, the Down Converter is now ready
for operation.
2.3 PREPARATION FOR RESHIPMENT
The original shipping container and packing materials may be used; otherwise, good packing
techniques should be used to protect equipment during reshipment.
MDC-1415-2C/17
MU-DEL ELECTRONICS, INC.
Page 7
SECTION III
OPERATION
3.1 INTRODUCTION
Only one operating mode exists for the Down Converter. The following paragraphs describe
the controls, indicators and the procedures for turn-on operation and turn-off.
3.2 CONTROLS AND INDICATORS
The POWER ON-OFF switch and indicator LED are combined into one device on the front
panel. The LED is illuminated when the switch is depressed to the ON position. In addition
to the power switch, the LOCK LOSS LED (DS2) indicator for the oscillator is located on the
front panel appropriately marked. The Gain Adjust controls for each channel are located on
the front panel, providing the operator the flexibility to change the channel gain to the desired
setting.
3.3 OPERATING PROCEDURE
3.3.1 TURN-ON
The Down Converter is activated by depressing the POWER ON-OFF switch. Illumination of
the LED indicates that the power has been applied, the power supply is functioning and the
unit should be operating. Warm-up time of five minutes is recommended for frequency
stability, the active circuits of the unit are completely solid-state.
3.3.2 OPERATION
Connect the RF inputs to the antenna, preamplifier output or other signal source and connect
the IF outputs to receivers or other loads.
3.3.3 TURN-OFF
The Down Converter is turned off by depressing the POWER ON-OFF switch. The indicator
LED will extinguish when power is removed.
MDC-1415-2C/17
MU-DEL ELECTRONICS, INC.
Page 8
SECTION IV
THEORY OF OPERATION
4.1 OVERALL FUNCTIONAL DESCRIPTION
The Down Converter is a dual channel, fixed tuned, superheterodyne system. Refer to the
Block Diagram in Figure 6-1, while reading the following descriptions.
RF signals enter the “RF IN” of each channel through the connector J1. Signals are fed to
low noise RF Amplifiers (A11, A21) for a good overall noise figure. The signals through the
Attenuators (ATT11, ATT21) are filtered to the desired frequencies through the RF Bandpass
Filters (FL11, FL21). The filtered signals pass through Attenuator (ATT12, ATT22) and are
applied to the "R" terminal of the Mixers (M11, M21). The mixed output signal through
terminal “I” of the Mixers (M11, M12) is attenuated in Attenuators (ATT13, ATT23) and
filtered to the desired frequency through filters (FL12, FL22). The mixed filtered signal is
now amplified by the IF Amplifiers (A12, A22) and fed to the “RF OUT” J2 through
Attenuators (ATT14, ATT24). Both channels share a common Local Oscillator (A1), which is
reference to a 10 MHz Reference Oscillator (A2). The output signal of the Local Oscillator
(A1) is amplified by the L.O. Amplifier (A4). The amplified signal is now fed to the Power
Divider (A5) where it is divided two ways. The outputs of the divider are fed to the Mixers
(M11, M21). Each channel is provided with individual channel gain controls located on the
front panel. Gain adjustment can be made between 0 to +35 dB. A red Lock Loss indicator
LED (DS2) is provided on the front panel to indicate Local Oscillator (A1) “LOSS OF LOCK”
condition.
4.2 SUBSYSTEM AND COMPONENT FUNCTIONAL DESCRIPTIONS
4.2.1 RF AMPLIFIERS A11, A21
The RF Amplifiers (A11, A21) are two stage, low noise, wide-band units which improve the
overall noise figure of the Down Converter. The gain of the RF Amplifier is 17 dB.
4.2.2 RF BANDPASS FILTERS FL11, FL21
The RF Bandpass Filters (FL11, FL21) are a five-pole design of LC construction tuned to the
input frequency band of the assembly. They reject undesired signals outside of the
passband, such as the image frequency, thereby improving the overall performance of the
converter.
4.2.3 MIXERS M11, M21
The Mixers (M11, M21) are a double balanced type. A local oscillator level of as high as +23
dBm can be applied to the "L" port. They have a conversion loss of approximately 7 dB.
MDC-1415-2C/17
Page 9
MU-DEL ELECTRONICS, INC.
4.2.4 IF BANDPASS FILTERS FL12, FL22
The IF Bandpass Filters (FL12, FL22) are a five-pole design of LC construction, tuned to the
output frequency band of the assembly. They reject undesired signals outside of the
passband, such as the harmonic frequencies, thereby improving the overall performance of
the converter.
4.2.5 IF AMPLIFIERS A12, A22
The IF Amplifiers (A12, A22) are integrated circuits and includes the attenuator circuitry for
the front panel channel gain adjustment. The amplifier gain is approximately 35 dB with
external gain adjust of 35 dB minimum.
4.2.6 REFERENCE OSCILLATOR A2
The Reference Oscillator (A2) is a temperature compensated crystal oscillator with an
output of 10 MHz and excellent stability of ± 5 x 10 -7 ppm per day.
4.2.7 LOCAL OSCILLATOR A1
The Local Oscillator (A1) is a low-noise, phase-locked loop source having the following
electrical characteristics:
Output Frequency:
1220 MHz
RF Output Power:
+11 to +12 dBm
RF Output Impedance:
50 ohms
External Reference Input Frequency:
10 MHz
Alarms and Monitors:
The oscillator is equipped with a red light-emitting diode (LED1), which illuminates
when the phase-lock loop is non-operational. In addition, lock loss is indicated by a
red LED indicator (DS2) on the front panel. This is connected to the "Fault" terminal of
the oscillator, via fault summary unit.
Local Oscillator (A1) is not designed to be field serviceable.
The output of the Local Oscillator (A1) passes through the L.O. Amplifier (A4) and then
divides two ways in the Power Divider (A5). The two output ports feed the Mixers (M11,
M21).
MDC-1415-2C/17
MU-DEL ELECTRONICS, INC.
Page 10
4.2.8 L.O. AMPLIFIER A4
The L.O. Amplifier (A4) is a one stage, high power amplifier which increases the output level
of the L.O. to compensate for the losses caused by the two-way power divider.
4.2.9 POWER DIVIDER A5
The Power Divider (A5) is a two-way hybrid power divider that splits the L.O. output providing
signals for Mixers (M11, M21).
4.2.10 POWER SUPPLY A3
The Regulated Power Supply (A3) provides the +15 VDC operating voltage for the Down
Converter assembly.
MDC-1415-2C/17
MU-DEL ELECTRONICS, INC.
Page 11
SECTION V
PARTS LIST
DOWN CONVERTER
MDC-1415-2C/17
SERIAL #: 490201
---------------------------------------------------------------------------------------------------------------------------------SYMBOL
DESCRIPTION
MU-DEL PART NO.
----------------------------------------------------------------------------------------------------------------------------------
A11, A21
RF AMPLIFIER
18-70- 5349
ATT11- ATT13, ATT21-ATT23
ATTENUATOR
20-25-5503
ATT14, ATT24
ATTENUATOR
20-25-5505
FL11, FL21
RF BANDPASS FILTER
34-15-0070
M11, M21
MIXER
40-02-0022-2
ATT1
ATTENUATOR
20-25-5507
FL12, FL22
IF BANDPASS FILTER
34-12-0095
A12, A22
IF AMPLIFIER
18-72-0036
A2
REFERENCE OSCILLATOR
42-05-0082
A1
LOCAL OSCILLATOR
42-01-0115
A4
L.O. AMPLIFIER
18-70-5246
A5
POWER DIVIDER
32-05-0056
A3
POWER SUPPLY
44-40-0109
S1
POWER SWITCH
53-80-0033
VR1
VOLTAGE REGULATOR
44-44-0021
MDC-1415-2C/17
Page 12
MU-DEL ELECTRONICS, INC.
PARTS LIST CONTINUED
MDC-1415-2C/17
SERIAL #: 490201
---------------------------------------------------------------------------------------------------------------------------------SYMBOL
DESCRIPTION
MU-DEL PART NO.
----------------------------------------------------------------------------------------------------------------------------------
DS1
POWER SWITCH LED
43-05-0026
DS2
LOCK LOSS LED
43-05-0005
F1
FUSE
35-02-0500
PC1
CONNECTOR, RECEPTACLE
36-15-0004
CHASSIS SLIDES
26-28-0008
WHEN ORDERING SPARE PARTS
SPECIFY THE MODEL AND SERIAL NUMBER OF EACH UNIT
MU-DEL ELECTRONICS, INC.
Page 13
Block Diagram, Figure 6-1
MDC-1415-2C/17
MU-DEL ELECTRONICS, INC.
Schematic Diagram, RF Amplifier, 1435 - 1540 MHz, Figure 6-2
MDC-1415-2C/17
Page 14
MU-DEL ELECTRONICS, INC.
Schematic Diagram, IF Amplifier, 215 - 315 MHz, Figure 6-3
MDC-1415-2C/17
Page 15
MU-DEL ELECTRONICS, INC.
Schematic Diagram, L.O. Amplifier, 1220 MHz, Figure 6-4
MDC-1415-2C/17
Page 16
Mudel
High L-Band
Down Converter
MDC-1718-2C/17
Page 1
MU-DEL ELECTRONICS, INC.
TABLE OF CONTENTS
Paragraph
I.
Page
Introduction ......................................................................................................3
1.1
1.1.1
1.1.2
1.2
1.2.1
1.2.2
1.3
1.3.1
1.3.2
General Description.......................................................................................3
Physical Characteristics .............................................................................3
Functional Characteristics ..........................................................................3
Specifications. ...............................................................................................3
Electrical Specifications..............................................................................3
Mechanical Specifications ..........................................................................4
Equipment Required......................................................................................5
Equipment Supplied ...................................................................................5
Test Equipment ..........................................................................................5
II. Installation .........................................................................................................6
2.1
2.2
2.3
Unpacking .....................................................................................................6
Mounting .......................................................................................................6
Preparation for Reshipment ..........................................................................6
III. Operation ..........................................................................................................7
3.1
3.2
3.3
3.3.1
3.3.2
3.3.3
Instruction......................................................................................................7
Controls and Indicators .................................................................................7
Operating Procedures ...................................................................................7
Turn-on.......................................................................................................7
Operation ...................................................................................................7
Turn-off.......................................................................................................7
IV. Theory of Operation .........................................................................................8
4.1
4.2
Overall Functional Description.......................................................................8
Subsystem Operation....................................................................................8
MDC-1718-2C/17
MU-DEL ELECTRONICS, INC.
Page 2
4.2.1
4.2.2
4.2.3
RF Amplifier A11, A21................................................................................8
RF Bandpass Filter FL11, FL21 .................................................................8
Mixer M11, M21..........................................................................................8
4.2.4
4.2.5
4.2.6
4.2.7
4.2.8
4.2.9
4.2.10
IF Band Pass Filter FL12, FL22..................................................................9
IF Amplifier A12, A22 .................................................................................9
Reference Oscillator A2 .............................................................................9
Local Oscillator A1 .....................................................................................9
L.O. Amplifier A4 ........................................................................................10
Power Divider A5........................................................................................10
Power Supply (+15 VDC) A3 .....................................................................10
V.
Parts List..........................................................................................................11
VI. Illustrations
Title
Figure
Block Diagram .........................................................................................................6-1
Schematic Diagram, RF Amplifier, 1750 - 1850 MHz .............................................6-2
Schematic Diagram, IF Amplifier, 215 - 315 MHz ..................................................6-3
Schematic Diagram, L.O. Amplifier, 1535 MHz ......................................................6-4
Page 3
MU-DEL ELECTRONICS, INC.
MDC-1718-2C/17
SECTION I
INTRODUCTION
1.1 GENERAL DESCRIPTION
1.1.1 PHYSICAL CHARACTERISTICS
The Down Converter Model MDC-1718-2C/17 is a dual channel unit. It is housed in a
standard rack mountable chassis of 1¾ " H X 19" W X 17" D. All connectors, fuses and
power receptacle are located on the rear apron of the unit. The Power Switch/Indicator, the
Local Oscillator lock loss LED indicator and the Channel Gain Control are all located on the
front panel. The handles on the front panel facilitate ease of installation and removal. For
installation stability slides are provided on the side of the unit. Modular construction
techniques are used and the active circuits are entirely solid-state.
1.1.2 FUNCTIONAL CHARACTERISTICS
The Model MDC-1718-2C/17 is an L-Band, fixed tuned dual channel radio frequency Down
Converter. Each channel independently can receive signals in the 1750 - 1850 MHz range
at the "RF IN” connector (J1) and converts them to frequencies in the 215 - 315 MHz range
at the “IF OUT” connector (J2). Each channel has an individual gain control located on the
front panel. Both channels share a common local Oscillator. The local oscillator
frequencies are phase locked to an internal 10 MHz reference oscillator.
DANGER !
REMOVE POWER PLUG BEFORE ATTEMPTING
TO GAIN ACCESS TO INSIDE OF UNIT
1.2 SPECIFICATIONS
1.2.1 ELECTRICAL SPECIFICATIONS
Frequency Range Input:
1750 - 1850 MHz
Frequency Range Output:
215 - 315 MHz
Gain (adjustable):
0 to + 35 dB
Noise Figure:
7 dB max.
MDC-1718-2C/17
Page 4
MU-DEL ELECTRONICS, INC.
Input VSWR:
1.5 : 1 max.
Output VSWR:
1.5 : 1 max.
Output Level @ 1dB Gain Compression:
0 dBm min.
Channel to Channel Isolation:
60 dB min.
Frequency Stability:
± 5 x 10
Third Order Intermodulation:
-50 dBc min. at two
Inputs signal -20 dBm
Each 1 MHz apart.
Image & IF Rejection:
60 dB min.
Impedance, Input and Output:
50 ohms
Number of RF Inputs:
Two (2)
Number of IF Outputs:
Two (2)
Power Requirements
90-260 VAC
47 - 440 Hz
-7
ppm per day
1.2.2 MECHANICAL SPECIFICATIONS
Connectors, RF:
Input:
Output:
N female
BNC female
Size:
1¾ "H X 19"W X 17"D
Weight:
10 lbs. (Slides excluded)
Finish:
Light Gray, Color #26440
FED STD 595; engraved
lettering, black filled
MDC-1718-2C/17
MU-DEL ELECTRONICS, INC.
Page 5
1.3 EQUIPMENT REQUIRED
1.3.1 EQUIPMENT SUPPLIED
* One Dual-Channel Down Converter Assembly,
Mu-Del Model: MDC-1718-2C/17
* One Technical Manual
* One Standard Three-Prong Power Cord
1.3.2 TEST EQUIPMENT
The following equipment is required for troubleshooting, repair and alignment procedures:
Signal Generator
Sweep Generator
Power Meter
Oscilloscope
Spectrum Analyzer
Directional Coupler
Frequency Counter
Detector
Digital Voltmeter
MDC-1718-2C/17
MU-DEL ELECTRONICS, INC.
Page 6
SECTION II
INSTALLATION
2.1 UNPACKING
Before unpacking equipment, examine package(s) for evidence of transportation mishandling
or damage. If damage is evident, the equipment should be unpacked and inspected
immediately to detect any shipping damage. Notify the carrier if the equipment is damaged.
Normally, the equipment should not be unpacked until ready for installation. Carefully open
containers and remove packing material with care. Empty containers and packing material
should be searched for additional accessories and then stored for future use.
2.2 MOUNTING
The chassis is designed for mounting in a standard 19-inch rack. Slides provided with the
unit are to be mounted to the rack for better stability. When the unit is fully mounted, the
power cord can now be connected on the rear apron and then plugged into the AC line.
After the RF input and output connections are completed, the Down Converter is now ready
for operation.
2.3 PREPARATION FOR RESHIPMENT
The original shipping container and packing materials may be used; otherwise, good packing
techniques should be used to protect equipment during reshipment.
MDC-1718-2C/17
MU-DEL ELECTRONICS, INC.
Page 7
SECTION III
OPERATION
3.1 INTRODUCTION
Only one operating mode exists for the Down Converter. The following paragraphs describe
the controls, indicators and the procedures for turn-on operation and turn-off.
3.2 CONTROLS AND INDICATORS
The POWER ON-OFF switch and indicator LED are combined into one device on the front
panel. The LED is illuminated when the switch is depressed to the ON position. In addition
to the power switch, the LOCK LOSS LED (DS2) indicator for the oscillator is located on the
front panel appropriately marked. The gain adjust controls for each channel are located on
the front panel, providing the operator the flexibility to change the channel gain to the desired
setting.
3.3 OPERATING PROCEDURE
3.3.1 TURN-ON
The Down Converter is activated by depressing the POWER ON-OFF switch. Illumination of
the LED indicates that the power has been applied, the power supply is functioning, and the
unit should be operating. Warm-up time of five minutes is recommended for frequency
stability, the active circuits of the unit are completely solid-state.
3.3.2 OPERATION
Connect the RF inputs to the antenna, preamplifier output or other signal source, and
connect the IF outputs to receivers or other loads.
3.3.3 TURN-OFF
The Down Converter is turned off by depressing the POWER ON-OFF switch. The indicator
LED will extinguish when power is removed.
MDC-1718-2C/17
MU-DEL ELECTRONICS, INC.
Page 8
SECTION IV
THEORY OF OPERATION
4.1 OVERALL FUNCTIONAL DESCRIPTION
The Down Converter is a dual channel, fixed tuned, superheterodyne system. Refer to the
Block Diagram in Figure 6-1, while reading the following descriptions.
RF signals enter the “RF IN” of each channel through the connector J1. Signals are fed to
low noise RF Amplifiers (A11, A21) for a good overall noise figure. The signals through the
Attenuators (ATT11, ATT21) are filtered to the desired frequencies through the RF Bandpass
Filters (FL11, FL21). The filtered signals pass through Attenuator (ATT12, ATT22) and are
applied to the "R" terminal of the Mixers (M11, M21). The mixed output signal through
terminal “I” of the Mixers (M11, M12) is attenuated in Attenuators (ATT13, ATT23) and
filtered to the desired frequency through filters (FL12, FL22). The mixed filtered signal is
now amplified by the IF Amplifiers (A12, A22) and fed to the “RF OUT” J2 through
Attenuators (ATT14, ATT24). Both channels share a common Local Oscillator (A1), which is
reference to a 10 MHz Reference Oscillator (A2). The output signal of the Local Oscillator
(A1) is amplified by the L.O. Amplifier (A4). The amplified signal is now fed to the Power
Divider (A5) where it is divided two ways. The outputs of the divider are fed to the Mixers
(M11, M21). Each channel is provided with individual channel gain controls located on the
front panel. Gain adjustment can be made between 0 to +35 dB. A red Lock Loss indicator
LED (DS2) is provided on the front panel to indicate Local Oscillator (A1) “LOSS OF LOCK”
condition.
4.2 SUBSYSTEM AND COMPONENT FUNCTIONAL DESCRIPTIONS
4.2.1 RF AMPLIFIERS A11, A21
The RF Amplifiers (A11, A21) are a two stage, low noise, wide-band units which improves
the over all noise figure of the Down Converter. The gain of the RF Amplifier is 17 dB.
4.2.2 RF BANDPASS FILTERS FL11, FL21
The RF Bandpass Filters (FL11, FL21) are a five-pole design of LC construction, tuned to the
input frequency band of the assembly. They reject undesired signals outside of the
passband, such as the image frequency, thereby improving the overall performance of the
converter.
4.2.3 MIXERS M11, M21
The Mixers (M11, M21) are a double balanced type. A local oscillator level of as high as +23
dBm can be applied to the "L" port. They have a conversion loss of approximately 7 dB.
MDC-1718-2C/17
Page 9
MU-DEL ELECTRONICS, INC.
4.2.4 IF BANDPASS FILTERS FL12, FL22
The IF Bandpass Filters (FL12, FL22) are a five-pole design of LC construction, tuned to the
output frequency band of the assembly. They reject undesired signals outside of the
passband, such as the harmonic frequencies, thereby improving the overall performance of
the converter.
4.2.5 IF AMPLIFIERS A12, A22
The IF Amplifiers (A12, A22) are integrated circuits and includes the attenuator circuitry for
the front panel channel gain adjustment. The amplifier gain is approximately 35 dB with
external gain adjustment of 35 dB minimum.
4.2.6 REFERENCE OSCILLATOR A2
The Reference Oscillator (A2) is a temperature compensated crystal oscillator with an
-7
output of 10 MHz and excellent stability of ± 5 x 10 ppm per day.
4.2.7 LOCAL OSCILLATORS A1
The Local Oscillators (A1) is a low-noise, phase locked loop source having the following
electrical characteristics:
Output Frequency:
1535 MHz
RF Output Power:
+11 to +12 dBm
RF Output Impedance:
50 ohms
External Reference Input Frequency:
10 MHz
Alarms and Monitors:
The oscillator is equipped with a red light-emitting diode (LED1), which illuminates
when the phase lock loop is non - operational. In addition, a red LED indicator (DS2)
on the front panel indicates lock loss. This is connected to the "Fault" terminal of the
oscillator, via fault summary unit.
Local Oscillator (A1) is not designed to be field serviceable.
The output of the Local Oscillator (A1) passes through the L.O. Amplifier (A4) and then
divides two ways in the Power Divider (A5). The two output ports feed the Mixers (M11,
M21).
MDC-1718-2C/17
MU-DEL ELECTRONICS, INC.
Page 10
4.2.8 L.O. AMPLIFIER A4
The L.O. Amplifier (A4) is a one stage, high power amplifier which increases the output level
of the L.O. to compensate for the losses caused by the two-way power divider.
4.2.9 POWER DIVIDER A5
The Power Divider (A5) is a two-way hybrid power divider that splits the L.O. output
providing signals for Mixers (M11, M21).
4.2.10 POWER SUPPLY A3
The Regulated Power Supply (A3) provides the +15 VDC operating voltage for the Down
Converter assembly.
MDC-1718-2C/17
Page 11
MU-DEL ELECTRONICS, INC.
SECTION V
PARTS LIST
MDC-1718-2C/17
SERIAL #: 484704-484705
---------------------------------------------------------------------------------------------------------------------------------SYMBOL
DESCRIPTION
MU-DEL PART NO.
----------------------------------------------------------------------------------------------------------------------------------
A11, A21
RF AMPLIFIER
18-70- 5349
ATT11-ATT14, ATT21-ATT24
ATTENUATOR
20-25-5503
FL11, FL21
RF BANDPASS FILTER
34-15-0071
M11, M21
MIXER
40-02-0022-2
FL12, FL22
IF BANDPASS FILTER
34-12-0095
A12, A22
IF AMPLIFIER
18-72-0036
ATT1
ATTENUATOR
20-25-5507
A2
REFERENCE OSCILLATOR
42-05-0082
A1
LOCAL OSCILLATOR
42-01-0116
A4
L.O. AMPLIFIER
18-70-5246
A5
POWER DIVIDER
32-05-0056
A3
POWER SUPPLY
44-40-0109
S1
POWER SWITCH
53-80-0033
VR1
VOLTAGE REGULATOR
44-44-0021
DS1
POWER SWITCH LED
43-05-0026
DS2
LOCK LOSS LED
43-05-0005
F1
FUSE
35-02-0500
PC1
CONNECTOR, RECEPTACLE
36-15-0004
CHASSIS SLIDES
26-28-0008
MU-DEL ELECTRONICS, INC.
Page 12
Block Diagram, Figure 6-1
MDC-1718-2C/17
MU-DEL ELECTRONICS, INC.
Schematic Diagram, RF Amplifier, 1750 - 1850 MHz, Figure 6-2
MDC-1718-2C/17
Page 13
MU-DEL ELECTRONICS, INC.
Schematic Diagram, IF Amplifier, 215 - 315 MHz, Figure 6-3
MDC-1718-2C/17
Page 14
MU-DEL ELECTRONICS, INC.
Schematic Diagram, L.O. Amplifier, 1535 MHz, Figure 6-4
MDC-1718-2C/17
Page 15
Mudel
Low S-Band
Down Converter
MDC-2223-2C/17
MU-DEL ELECTRONICS, INC.
Page 1
TABLE OF CONTENTS
Paragraph
I.
Page
Introduction ......................................................................................................3
1.1
1.1.1
1.1.2
1.2
1.2.1
1.2.2
1.3
1.3.1
1.3.2
General Description.......................................................................................3
Physical Characteristics .............................................................................3
Functional Characteristics ..........................................................................3
Specifications. ...............................................................................................3
Electrical Specifications..............................................................................3
Mechanical Specifications ..........................................................................4
Equipment Required......................................................................................5
Equipment Supplied ...................................................................................5
Test Equipment ..........................................................................................5
II. Installation .........................................................................................................6
2.1
2.2
2.3
Unpacking .....................................................................................................6
Mounting .......................................................................................................6
Preparation for Reshipment ..........................................................................6
III. Operation ..........................................................................................................7
3.1
3.2
3.3
3.3.1
3.3.2
3.3.3
Instruction......................................................................................................7
Controls and Indicators .................................................................................7
Operating Procedures ...................................................................................7
Turn-on.......................................................................................................7
Operation ...................................................................................................7
Turn-off.......................................................................................................7
IV. Theory of Operation .........................................................................................8
4.1
4.2
Overall Functional Description.......................................................................8
Subsystem Operation....................................................................................8
MDC-2223-2C/17
4.2.1
4.2.2
4.2.3
4.2.4
4.2.5
4.2.6
4.2.7
4.2.8
4.2.9
4.2.10
V.
MU-DEL ELECTRONICS, INC.
Page 2
RF Amplifier A11, A21................................................................................8
RF Bandpass Filter FL12, FL22 .................................................................8
Mixer M11, M21..........................................................................................8
IF Bandpass Filter FL12, FL22 ...................................................................9
IF Amplifier A12, A22 .................................................................................9
Reference Oscillator A2 .............................................................................9
Local Oscillator A1 .....................................................................................9
L.O. Amplifier A4 ........................................................................................10
Power Divider A5........................................................................................10
Power Supply (+15 VDC) A3 .....................................................................10
Parts List..........................................................................................................11
VI. Illustrations
Title
Figure
Block Diagram .........................................................................................................6-1
Schematic Diagram, RF Amplifier, 2200 - 2300 MHz .............................................6-2
Schematic Diagram, IF Amplifier, 215 - 315 MHz ..................................................6-3
Schematic Diagram, L.O. Amplifier, 1985 MHz ......................................................6-4
MDC-2223-2C/17
MU-DEL ELECTRONICS, INC.
Page 3
SECTION I
INTRODUCTION
1.1 GENERAL DESCRIPTION
1.1.1 PHYSICAL CHARACTERISTICS
The Down Converter Model MDC-2223-2C/17 is a dual channel unit. It is housed in a
standard rack mountable chassis of 1¾ " H X 19" W X 17" D. All connectors, fuses and
power receptacle are located on the rear apron of the unit. The Power Switch/Indicator,
Local Oscillator lock loss LED indicator and the Channel Gain Controls are all located on
the front panel. The handles on the front panel facilitate ease of installation and removal.
For installation stability slides are provided on the side of the unit. Modular construction
techniques are used and the active circuits are entirely solid-state.
1.1.2 FUNCTIONAL CHARACTERISTICS
The Model MDC-2223-2C/17 is an S-Band, fixed tuned, dual channel radio frequency Down
Converter. Each channel independently can receive signals in the 2200 - 2300 MHz range
at the "RF IN” connector (J1) and converts them to frequencies in the 215 - 315 MHz range
at the “IF OUT” connector (J2). Each channel has an individual gain control located on the
front panel. Both channels share a common local Oscillator. The local oscillator
frequencies are phase-locked to an internal 10 MHz reference oscillator.
DANGER !
REMOVE POWER PLUG BEFORE ATTEMPTING
TO GAIN ACCESS TO INSIDE OF UNIT
1.2 SPECIFICATIONS
1.2.1 ELECTRICAL SPECIFICATIONS
Frequency Range Input:
2200 - 2300 MHz
Frequency Range Output:
215 - 315 MHz
Gain (adjustable):
0 to + 35 dB
Noise Figure:
7 dB max.
MDC-2223-2C/17
MU-DEL ELECTRONICS, INC.
Page 4
Input VSWR:
1.5: 1 max.
Output VSWR:
1.5: 1 max.
Output Level @ 1dB Gain Compression:
0 dBm min.
Channel to Channel Isolation:
60 dB min.
Frequency Stability:
± 5 x 10
Third Order Intermodulation:
-50 dBc min. at two
Inputs signal -20 dBm
each 1 MHz apart.
Image & IF Rejection:
60 dB min.
Impedance, Input and Output:
50 ohms
Number of RF Inputs:
Two (2)
Number of IF Outputs:
Two (2)
Power Requirements
90-260 VAC,
47 - 440 Hz
-7
ppm per day
1.2.2 MECHANICAL SPECIFICATIONS
Connectors, RF:
Input:
Output:
N female
BNC female
Size:
1¾ "H X 19"W X 17"D
Weight:
10 lbs. (Slides excluded)
Finish:
Light Gray, Color #26440
FED STD 595; engraved
lettering, black filled
MDC-2223-2C/17
MU-DEL ELECTRONICS, INC.
Page 5
1.3 EQUIPMENT REQUIRED
1.3.1 EQUIPMENT SUPPLIED
* One Dual-Channel Down Converter Assembly,
Mu-Del Model: MDC-2223-2C/17
* One Technical Manual
* One Standard Three-Prong Power Cord
1.3.2 TEST EQUIPMENT
The following equipment is required for troubleshooting, repair and alignment procedures:
Signal Generator
Sweep Generator
Power Meter
Oscilloscope
Spectrum Analyzer
Directional Coupler
Frequency Counter
Detector
Digital Voltmeter
MDC-2223-2C/17
MU-DEL ELECTRONICS, INC.
Page 6
SECTION II
INSTALLATION
2.1 UNPACKING
Before unpacking equipment, examine package(s) for evidence of transportation mishandling
or damage. If damage is evident, the equipment should be unpacked and inspected
immediately to detect any shipping damage. Notify the carrier if the equipment is damaged.
Normally, the equipment should not be unpacked until ready for installation. Carefully open
containers and remove packing material with care. Empty containers and packing material
should be searched for additional accessories and then stored for future use.
2.2 MOUNTING
The chassis is designed for mounting in a standard 19-inch rack. Slides provided with the
unit are to be mounted to the rack for better stability. When the unit is fully mounted, the
power cord can now be connected on the rear apron and then plugged into the AC line.
After the RF input and output connections are completed, the Down Converter is now ready
for operation.
2.3 PREPARATION FOR RESHIPMENT
The original shipping container and packing materials may be used; otherwise, good packing
techniques should be used to protect equipment during reshipment.
MDC-2223-2C/17
MU-DEL ELECTRONICS, INC.
Page 7
SECTION III
OPERATION
3.1 INTRODUCTION
Only one operating mode exists for the Down Converter. The following paragraphs describe
the controls, indicators and the procedures for turn-on operation and turn-off.
3.2 CONTROLS AND INDICATORS
The POWER ON-OFF switch and indicator LED are combined into one device on the front
panel. The LED is illuminated when the switch is depressed to the ON position. In addition
to the power switch, the LOCK LOSS LED (DS2) indicator for the oscillator is located on the
front panel appropriately marked. The Gain adjust controls for each channel are located on
the front panel, providing the operator the flexibility to change the channel gain to the desired
setting.
3.3 OPERATING PROCEDURE
3.3.1 TURN-ON
The Down Converter is activated by depressing the POWER ON-OFF switch. Illumination of
the LED indicates that the power has been applied, the power supply is functioning, and the
unit should be operating. Warm-up time of five minutes is recommended for frequency
stability, the active circuits of the unit are completely solid-state.
3.3.2 OPERATION
Connect the RF inputs to the antenna, preamplifier output or other signal source, and
connect the IF outputs to receivers or other loads.
3.3.3 TURN-OFF
The Down Converter is turned off by depressing the POWER ON-OFF switch. The indicator
LED will extinguish when power is removed.
SECTION IV
THEORY OF OPERATION
4.1 OVERALL FUNCTIONAL DESCRIPTION
The Down Converter is a dual channel, fixed tuned, superheterodyne system. Refer to the
Block Diagram in Figure 6-1, while reading the following descriptions.
MDC-2223-2C/17
MU-DEL ELECTRONICS, INC.
Page 8
RF signals enter the “RF IN” of each channel through the connector J1. Signals are fed to
low noise RF Amplifiers (A11, A21) for a good overall noise figure. The signals through the
Attenuators (ATT11, ATT21) are filtered to the desired frequencies through the RF Bandpass
Filters (FL11, FL21). The filtered signals pass through Attenuator (ATT12, ATT22) and are
applied to the "R" terminal of the Mixers (M11, M21). The mixed output signal through
terminal “I” of the Mixers (M11, M12) is attenuated in Attenuators (ATT13, ATT23) and
filtered to the desired frequency through filters (FL12, FL22). The mixed filtered signal is
now amplified by the IF Amplifiers (A12, A22) and fed to the “RF OUT” J2 through
Attenuators (ATT14, ATT24). Both channels share a common Local Oscillator (A1), which is
reference to a 10 MHz Reference Oscillator (A2). The output signal of the Local Oscillator
(A1) is amplified by the L.O. Amplifier (A4). The amplified signal is now fed to the Power
Divider (A5) where it is divided two ways. The outputs of the divider are fed to the Mixers
(M11, M21). Each channel is provided with individual channel gain controls located on the
front panel. Gain adjustment can be made between 0 to +35 dB. A red Lock Loss indicator
LED (DS2) is provided on the front panel to indicate Local Oscillator (A1) “LOSS OF LOCK”
condition.
4.2 SUBSYSTEM AND COMPONENT FUNCTIONAL DESCRIPTIONS
4.2.1 RF AMPLIFIERS A11, A21
The RF Amplifiers (A11, A21) are two stage, low noise, wide-band units which improve the
over all noise figure of the Down Converter. The gain of the RF Amplifier is 17 dB.
4.2.2 RF BANDPASS FILTERS FL11, FL21
The RF Bandpass Filters (FL11, FL21) are a five-pole design of LC construction tuned to the
input frequency band of the assembly. They reject undesired signals outside of the
passband, such as the image frequency, thereby improving the overall performance of the
converter.
4.2.3 MIXERS M11, M21
The Mixers (M11, M21) are a double balanced type. A local oscillator level as high as +23
dBm can be applied to the "L" port. They have a conversion loss of approximately 7 dB.
MDC-2223-2C/17
MU-DEL ELECTRONICS, INC.
Page 9
4.2.4 IF BANDPASS FILTERS FL12, FL22
The IF Bandpass Filters (FL12, FL22) are a five-pole design of LC construction, tuned to the
output frequency band of the assembly. They reject undesired signals outside of the
passband, such as the harmonic frequencies, thereby improving the overall performance of
the converter.
4.2.5 IF AMPLIFIERS A12, A22
The IF Amplifiers (A12, A22) are integrated circuits and includes the attenuator circuitry for
the rear panel channel gain adjustment. The amplifier gain is approximately 35 dB with
external gain adjust of 35 dB minimum.
4.2.6 REFERENCE OSCILLATOR A2
The Reference Oscillator (A2) is a temperature compensated crystal oscillator with an
output of 10 MHz and excellent stability of ±5 x 10 -7 ppm per day.
4.2.7 LOCAL OSCILLATOR A1
The Local Oscillator (A1) is a low-noise, phase-locked loop source having the following
electrical characteristics:
Output Frequency:
1985 MHz
RF Output Power:
+11 to +12 dBm
RF Output Impedance:
50 ohms
External Reference Input Frequency:
10 MHz
Alarms and Monitors:
The oscillator is equipped with a red light-emitting diode (LED1), which illuminates
when the phase lock loop is non-operational. In addition, a red LED indicator (DS2)
on the front panel indicates lock loss. This is connected to the "Fault" terminal of the
oscillator, via fault summary unit.
Local Oscillator (A1) is not designed to be field serviceable.
The output of the Local Oscillator (A1) passes through the L.O. Amplifier (A4) and then
divides three ways in the Power Divider (A5). The two output ports feed the Mixers (M11,
M21).
MDC-2223-2C/17
MU-DEL ELECTRONICS, INC.
Page 10
4.2.8 L.O. AMPLIFIER A4
The L.O. Amplifier (A4) is a one stage, high power amplifier which increases the output level
of the L.O. to compensate for the losses caused by the two-way power divider.
4.2.9 POWER DIVIDER A5
The Power Divider (A5) is a two-way hybrid power divider that splits the L.O. output providing
signals for Mixers (M11, M21).
4.2.10 POWER SUPPLY A3
The Regulated Power Supply (A3) provides the +15 VDC operating voltage for the Down
Converter assembly.
MDC-2223-2C/17
MU-DEL ELECTRONICS, INC.
Page 11
SECTION V
PARTS LIST
DOWN CONVERTER
MDC-2223-2C/17
SERIAL #: 490202
---------------------------------------------------------------------------------------------------------------------------------SYMBOL
DESCRIPTION
MU-DEL PART NO.
----------------------------------------------------------------------------------------------------------------------------------
A11, A21
RF AMPLIFIER
18-70- 5349
ATT11-ATT14, ATT21-ATT24
ATTENUATOR
20-25-5503
FL11, FL21
RF BANDPASS FILTER
34-15-0069
M11, M21
MIXER
40-02-0022-2
ATT1
ATTENUATOR
20-25-5507
FL12, FL22
IF BANDPASS FILTER
34-12-0095
A12, A22
IF AMPLIFIER
18-72-0036
A2
REFERENCE OSCILLATOR
42-05-0082
A1
LOCAL OSCILLATOR
42-01-0117
A4
L.O. AMPLIFIER
18-70-5246
A5
POWER DIVIDER
32-05-0057
A3
POWER SUPPLY
44-40-0109
S1
POWER SWITCH
53-80-0033
DS1
POWER SWITCH LED
43-05-0026
DS2
LOCK LOSS LED
43-05-0005
MDC-2223-2C/17
MU-DEL ELECTRONICS, INC.
Page 12
PARTS LIST CONTINUED
MDC-2223-2C/17
SERIAL #: 490202
---------------------------------------------------------------------------------------------------------------------------------SYMBOL
DESCRIPTION
MU-DEL PART NO.
----------------------------------------------------------------------------------------------------------------------------------
F1
FUSE
35-02-0500
PC1
CONNECTOR, RECEPTACLE
36-15-0004
VR1
VOLTAGE REGULATOR
44-44-0021
CHASSIS SLIDES
26-28-0008
WHEN ORDERING SPARE PARTS
SPECIFY THE MODEL AND SERIAL NUMBER OF EACH UNIT
MU-DEL ELECTRONICS, INC.
Page 13
Block Diagram, Figure 6-1
MDC-2223-2C/17
MU-DEL ELECTRONICS, INC.
Schematic Diagram, RF Amplifier, 2200 - 2300 MHz, Figure 6-2
MDC-2223-2C/17
Page 14
MU-DEL ELECTRONICS, INC.
Schematic Diagram, IF Amplifier, 215 - 315 MHz, Figure 6-3
MDC-2223-2C/17
Page 15
MU-DEL ELECTRONICS, INC.
Schematic Diagram, L.O. Amplifier, 1985 MHz, Figure 6-4
MDC-2223-2C/17
Page 16
Mudel
High S-Band
Down Converter
MDC-2324-2C/17
MU-DEL ELECTRONICS, INC.
Page 1
TABLE OF CONTENTS
Paragraph
I.
Page
Introduction ......................................................................................................3
1.1
1.1.1
1.1.2
1.2
1.2.1
1.2.2
1.3
1.3.1
1.3.2
General Description.......................................................................................3
Physical Characteristics .............................................................................3
Functional Characteristics ..........................................................................3
Specifications. ...............................................................................................3
Electrical Specifications..............................................................................3
Mechanical Specifications ..........................................................................4
Equipment Required......................................................................................5
Equipment Supplied ...................................................................................5
Test Equipment ..........................................................................................5
II. Installation .........................................................................................................6
2.1
2.2
2.3
Unpacking .....................................................................................................6
Mounting .......................................................................................................6
Preparation for Reshipment ..........................................................................6
III. Operation ..........................................................................................................7
3.1
3.2
3.3
3.3.1
3.3.2
3.3.3
Instruction......................................................................................................7
Controls and Indicators .................................................................................7
Operating Procedures ...................................................................................7
Turn-on.......................................................................................................7
Operation ...................................................................................................7
Turn-off.......................................................................................................7
IV. Theory of Operation .........................................................................................8
4.1
4.2
Overall Functional Description.......................................................................8
Subsystem and Component Description .......................................................8
MDC-2324-2C/17
4.2.1
4.2.2
4.2.3
4.2.4
4.2.5
4.2.6
4.2.7
4.2.8
4.2.9
4.2.10
V.
MU-DEL ELECTRONICS, INC.
Page 2
RF Amplifier A11, A21................................................................................8
RF Bandpass Filter FL11, FL21 .................................................................8
Mixer M11, M21..........................................................................................8
IF Bandpass Filter FL12, FL22 ...................................................................9
IF Amplifier A12, A22 .................................................................................9
Reference Oscillator A2 .............................................................................9
Local Oscillator A1 .....................................................................................9
L.O. Amplifier A4 ........................................................................................10
Power Divider A5........................................................................................10
Power Supply (+15 VDC) A3 .....................................................................10
Parts List..........................................................................................................11
VI. Illustrations
Title
Figure
Block Diagram .........................................................................................................6-1
Schematic Diagram, RF Amplifier, 2300 - 2400MHz ..............................................6-2
Schematic Diagram, IF Amplifier, 215 - 315 MHz ..................................................6-3
Schematic Diagram, L.O. Amplifier, 2085 MHz ......................................................6-4
MDC-2324-2C/17
MU-DEL ELECTRONICS, INC.
Page 3
SECTION I
INTRODUCTION
1.1 GENERAL DESCRIPTION
1.1.1 PHYSICAL CHARACTERISTICS
The Down Converter Model MDC-2324-2C/17 is a dual channel unit. It is housed in a
standard rack mountable chassis of 1¾ " H X 19" W X 17" D. All connectors, fuses and
power receptacle are located on the rear apron of the unit. The Power Switch/Indicator and
the Local Oscillator lock loss LED indicator and the Channel Gain Controls are all located
on the front panel. The handles on the front panel facilitate ease of installation and
removal. For installation stability slides are provided on the side of the unit. Modular
construction techniques are used and the active circuits are entirely solid-state.
1.1.2 FUNCTIONAL CHARACTERISTICS
The Model MDC-2324-2C/17 is an S-Band, fixed tuned, dual channel radio frequency Down
Converter. Each channel independently can receive signals in the 2300 - 2400 MHz range
at the "RF IN” connector (J1) and converts them to frequencies in the 215 - 315 MHz range
at the “IF OUT” connector (J2). Each channel has an individual gain control located on the
front panel. Both channels share a common local Oscillator. The local oscillator
frequencies are phase-locked to an internal 10 MHz reference oscillator.
DANGER !
REMOVE POWER PLUG BEFORE ATTEMPTING
TO GAIN ACCESS TO INSIDE OF UNIT
1.2 SPECIFICATIONS
1.2.1 ELECTRICAL SPECIFICATIONS
Frequency Range Input:
2300 - 2400 MHz
Frequency Range Output:
215 - 315 MHz
Gain (adjustable):
0 to + 35 dB
Noise Figure:
9 dB max.
MDC-2324-2C/17
MU-DEL ELECTRONICS, INC.
Page 4
Input VSWR:
1.5 : 1 max.
Output VSWR:
1.5 : 1 max.
Output Level @ 1dB Gain Compression:
0 dBm min.
Channel to Channel Isolation:
60 dB min.
Frequency Stability:
±5 x 10
Third Order Intermodulation:
-50 dBc min. at two
Inputs signal -20 dBm
each 1 MHz apart.
Image & IF Rejection:
60 dB min.
Impedance, Input and Output:
50 ohms
Number of RF Inputs:
Two (2)
Number of IF Outputs:
Two (2)
Power Requirements
90-260 VAC,
47 - 440 Hz
-7
ppm per day
1.2.2 MECHANICAL SPECIFICATIONS
Connectors, RF:
Input:
Output:
N female
BNC female
Size:
1¾ "H X 19"W X 17"D
Weight:
10 lbs. (Slides excluded)
Finish:
Light Gray, Color #26440
FED STD 595; engraved
lettering, black filled
MDC-2324-2C/17
MU-DEL ELECTRONICS, INC.
Page 5
1.3 EQUIPMENT REQUIRED
1.3.1 EQUIPMENT SUPPLIED
* One Dual-Channel Down Converter Assembly,
Mu-Del Model: MDC-2324-2C/17
* One Technical Manual
* One Standard Three-Prong Power Cord
1.3.2 TEST EQUIPMENT
The following equipment is required for troubleshooting, repair and alignment procedures:
Signal Generator
Sweep Generator
Power Meter
Oscilloscope
Spectrum Analyzer
Directional Coupler
Frequency Counter
Detector
Digital Voltmeter
MDC-2324-2C/17
MU-DEL ELECTRONICS, INC.
Page 6
SECTION II
INSTALLATION
2.1 UNPACKING
Before unpacking equipment, examine package(s) for evidence of transportation mishandling
or damage. If damage is evident, the equipment should be unpacked and inspected
immediately to detect any shipping damage. Notify the carrier if the equipment is damaged.
Normally, the equipment should not be unpacked until ready for installation. Carefully open
containers and remove packing material with care. Empty containers and packing material
should be searched for additional accessories and then stored for future use.
2.2 MOUNTING
The chassis is designed for mounting in a standard 19-inch rack. Slides provided with the
unit are to be mounted to the rack for better stability. When the unit is fully mounted, the
power cord can now be connected on the rear apron and then plugged into the AC line.
After the RF input and output connections are completed, the Down Converter is now ready
for operation.
2.3 PREPARATION FOR RESHIPMENT
The original shipping container and packing materials may be used; otherwise, good packing
techniques should be used to protect equipment during reshipment.
MDC-2324-2C/17
MU-DEL ELECTRONICS, INC.
Page 7
SECTION III
OPERATION
3.1 INTRODUCTION
Only one operating mode exists for the Down Converter. The following paragraphs describe
the controls, indicators and the procedures for turn-on operation and turn-off.
3.2 CONTROLS AND INDICATORS
The POWER ON-OFF switch and indicator LED are combined into one device on the front
panel. The LED is illuminated when the switch is depressed to the ON position. In addition
to the power switch, the LOCK LOSS LED (DS2) indicator for the oscillator is located on the
front panel appropriately marked. The Gain adjust controls for each channel are located on
the front panel, providing the operator the flexibility to change the channel gain to the desired
setting.
3.3 OPERATING PROCEDURE
3.3.1 TURN-ON
The Down Converter is activated by depressing the POWER ON-OFF switch. Illumination of
the LED indicates that the power has been applied, the power supply is functioning, and the
unit should be operating. Warm-up time of five minutes is recommended for frequency
stability, the active circuits of the unit are completely solid-state.
3.3.2 OPERATION
Connect the RF inputs to the antenna, preamplifier output or other signal source, and
connect the IF outputs to receivers or other loads.
3.3.3 TURN-OFF
The Down Converter is turned off by depressing the POWER ON-OFF switch. The indicator
LED will extinguish when power is removed.
MDC-2324-2C/17
MU-DEL ELECTRONICS, INC.
Page 8
SECTION IV
THEORY OF OPERATION
4.1 OVERALL FUNCTIONAL DESCRIPTION
The Down Converter is a dual channel, fixed tuned, superheterodyne system. Refer to the
Block Diagram in Figure 6-1, while reading the following descriptions.
RF signals enter the “RF IN” of each channel through the connector J1. Signals are fed to
low noise RF Amplifiers (A11, A21) for a good overall noise figure. The signals through the
Attenuators (ATT11, ATT21) are filtered to the desired frequencies through the RF Bandpass
Filters (FL11, FL21). The filtered signals pass through Attenuator (ATT12, ATT22) and are
applied to the "R" terminal of the Mixers (M11, M21). The mixed output signal through
terminal “I” of the Mixers (M11, M12) is attenuated in Attenuators (ATT13, ATT23) and
filtered to the desired frequency through filters (FL12, FL22). The mixed filtered signal is
now amplified by the IF Amplifiers (A12, A22) and fed to the “RF OUT” J2 through
Attenuators (ATT14, ATT24). Both channels share a common Local Oscillator (A1), which is
reference to a 10 MHz Reference Oscillator (A2). The output signal of the Local Oscillator
(A1) is amplified by the L.O. Amplifier (A4). The amplified signal is now fed to the Power
Divider (A5) where it is divided two ways. The outputs of the divider are fed to the Mixers
(M11, M21). Each channel is provided with individual channel gain controls located on the
front panel. Gain adjustment can be made between 0 to +35 dB. A red Lock Loss indicator
LED (DS2) is provided on the front panel to indicate Local Oscillator (A1) “LOSS OF LOCK”
condition.
4.2 SUBSYSTEM AND COMPONENT FUNCTIONAL DESCRIPTIONS
4.2.1 RF AMPLIFIERS A11, A21
The RF Amplifiers (A11, A21) are a two-stage, low noise, wide-band units which improves
the over all noise figure of the Down Converter. The gain of the RF Amplifier unit is 17 dB.
4.2.2 RF BANDPASS FILTERS FL11, FL21
The RF Bandpass Filters (FL11, FL21) are a five-pole design of LC construction, tuned to the
input frequency band of the assembly. They reject undesired signals outside of the
passband, such as the image frequency, thereby improving the overall performance of the
converter.
4.2.3 MIXERS M11, M21
The Mixers (M11, M21) are a double balanced type. A local oscillator level of as high as +23
dBm, can be applied to the "L" port. They have a conversion loss of approximately 7 dB.
MDC-2324-2C/17
MU-DEL ELECTRONICS, INC.
Page 9
4.2.4 IF BANDPASS FILTERS FL12, FL22
The IF Bandpass Filters (FL12, FL22) are a five-pole design of LC construction, tuned to the
output frequency band of the assembly. They reject undesired signals outside of the
passband, such as the harmonic frequencies, thereby improving the overall performance of
the converter.
4.2.5 IF AMPLIFIERS A12, A22
The IF Amplifiers (A12, A22) are integrated circuits and includes an attenuator circuitry for
the front panel channel gain adjustment. The amplifier gain is approximately 35 dB with
external gain adjust of 35 dB min.
4.2.6 REFERENCE OSCILLATOR A2
The Reference Oscillator (A2) is a temperature compensated crystal oscillator with an
output of 10 MHz and excellent stability of ±5 x 10-7 ppm per day.
4.2.7 LOCAL OSCILLATOR A1
The Local Oscillator (A1) is a low-noise, phase-locked loop source having the following
electrical characteristics:
Output Frequency:
2085 MHz
RF Output Power:
+11 to +12 dBm
RF Output Impedance:
50 ohms
External Reference Input Frequency:
10 MHz
Alarms and Monitors:
The oscillator is equipped with a red light-emitting diode (LED1), which illuminates
when the phase lock loop is non-operational. In addition, a red LED indicator (DS2)
on the front panel indicates lock loss. This is connected to the "Fault" terminal of the
oscillator, via fault summary unit.
Local Oscillator (A1) is not designed to be field serviceable.
The output of the Local Oscillator (A1) passes through the L.O. Amplifier (A4) and then
divides two ways in the Power Divider (A5). The two output ports feed the Mixers (M11,
M21).
MDC-2324-2C/17
MU-DEL ELECTRONICS, INC.
Page 10
4.2.8 L.O. AMPLIFIER A4
The L.O. Amplifier (A4) is a one stage, high power amplifier which increases the output level
of the L.O. to compensate for the losses caused by the two-way power divider.
4.2.9 POWER DIVIDER A5
The Power Divider (A5) is a two-way hybrid power divider that splits the L.O. output providing
signals for Mixers (M11, M21).
4.2.10 POWER SUPPLY A3
The Regulated Power Supply (A3) provides the +15 VDC operating voltage for the Down
Converter assembly.
MDC-2324-2C/17
MU-DEL ELECTRONICS, INC.
Page 11
SECTION V
PARTS LIST
MDC-2324-2C/17
SERIAL #: 484708-484709
---------------------------------------------------------------------------------------------------------------------------------SYMBOL
DESCRIPTION
MU-DEL PART NO.
----------------------------------------------------------------------------------------------------------------------------------
A11, A21
RF AMPLIFIER
18-70- 5349
ATT11-ATT14, ATT21-ATT24
ATTENUATOR
20-25-5503
FL11, FL21
RF BANDPASS FILTER
34-15-0072
M11, M21
MIXER
40-02-0022-2
ATT1
ATTENUATOR
20-25-5507
FL12, FL22
IF BANDPASS FILTER
34-12-0095
A12, A22
IF AMPLIFIER
18-72-0036
A2
REFERENCE OSCILLATOR
42-05-0082
A1
LOCAL OSCILLATOR
42-01-0118
A5
L.O. AMPLIFIER
18-70-5246
A6
POWER DIVIDER
32-05-0057
A3
POWER SUPPLY
44-40-0109
S1
POWER SWITCH
53-80-0033
DS1
POWER SWITCH LED
43-05-0026
DS2
LOCK LOSS LED
43-05-0005
F1
FUSE
35-02-0500
PC1
CONNECTOR, RECEPTACLE
36-15-0004
VR1
VOLTAGE REGULATOR
44-44-0021
CHASSIS SLIDES
26-28-0008
MU-DEL ELECTRONICS, INC.
Page 12
Block Diagram, Figure 6-1
MDC-2324-2C/17
MU-DEL ELECTRONICS, INC.
Schematic Diagram, RF Amplifier, 2300 - 2400 MHz, Figure 6-2
MDC-2324-2C/17
Page 13
MU-DEL ELECTRONICS, INC.
Schematic Diagram, IF Amplifier, 215 - 315 MHz, Figure 6-3
MDC-2324-2C/17
Page 14
MU-DEL ELECTRONICS, INC.
Schematic Diagram, L.O. Amplifier, 2085 MHz, Figure 6-4
MDC-2324-2C/17
Page 15
Mudel
215-320MHz
Multicoupler
2MDP-2/215-320
MU-DEL ELECTRONICS, INC.
Page 1
TABLE OF CONTENTS
Section
Page
SECTION I:
Introduction............................................................................................ 3
1.1 General Description ......................................................................................... 3
1.1.1 Physical Characteristics ......................................................................... 3
1.1.2 Functional Characteristics ...................................................................... 3
1.2 Equipment Characteristics ............................................................................... 3
1.2.1 Electrical Specifications.......................................................................... 3
1.2.2 Mechanical Specifications ...................................................................... 4
1.3 Equipment Required ........................................................................................ 4
1.3.1 Equipment Supplied ............................................................................... 4
1.3.2 Equipment Required but not Supplied.................................................... 4
SECTION II: Installation ............................................................................................. 5
2.1 Unpacking ........................................................................................................ 5
2.2 Mounting .......................................................................................................... 5
2.3 Preparation for Reshipment ............................................................................. 5
SECTION III: Operation............................................................................................... 6
3.1 Introduction ...................................................................................................... 6
3.2 Controls and Indicators .................................................................................... 6
3.3 Operating Procedure........................................................................................ 6
3.3.1 Turn-on................................................................................................... 6
3.3.2 Operation ............................................................................................... 6
3.3.3 Turn-off................................................................................................... 6
2MDP-2/215-320
MU-DEL ELECTRONICS, INC.
Sections
Page 2
Page
SECTION IV: Theory of Operation ............................................................................. 7
4.1 Functional Description ..................................................................................... 7
4.2 Module And Component Functional Description .............................................. 7
4.2.1 RF Amplifier A11, A21............................................................................ 7
4.2.2 RF Distribution A12-A14, A22-A24, ATT11-ATT18, ATT21-ATT28........ 7
4.2.3 Power Supply A3.................................................................................... 7
SECTION V:
Maintenance........................................................................................ 10
5.1 Preventive Maintenance ................................................................................. 10
5.2 Corrective Maintenance .................................................................................. 10
5.2.1 Troubleshooting..................................................................................... 10
ILLUSTRATIONS
Figure No.
Page
4-1 Block Diagram....................................................................................................... 8
4-2 Schematic Diagram, Amplifier ............................................................................... 9
TABLES
Table.
Page
5-1 Parts List .............................................................................................................. 11
5-2 Fault Isolation Table............................................................................................. 12
2MDP-2/215-320
Page 3
MU-DEL ELECTRONICS, INC.
SECTION I
INTRODUCTION
1.1 GENERAL DESCRIPTION
1.1.1 PHYSICAL CHARACTERISTICS
The Model 2MDP-2/215-320, Multicoupler package design, enables it to be mounted in a
standard 19-inch rack; height 1.75" and behind-panel depth is 11.5". Handles are provided
on the front panel to facilitate installation and removal. The top cover may be easily
removed for access to the interior of the multicoupler. All subsystems are shielded to
reduce electromagnetic radiation and susceptibility. Modular construction techniques are
used and the active circuits are entirely solid-state. All connections to the unit are made on
its rear apron.
1.1.2 FUNCTIONAL CHARACTERISTICS
The dual channel P-Band multicoupler is designed to operate in a telemetry receiving
system covering the frequency range of 215 - 320 MHz. Each channel is capable of driving
up to eight (8) 50 ohm loads from an RF source with minimum degradation of the signal.
The wide dynamic range and low noise figure provide optimum performance over a wide
range of input signal levels.
1.2 EQUIPMENT CHARACTERISTICS
1.2.1 ELECTRICAL SPECIFICATIONS
Frequency Range:
215 - 320 MHz
Gain:
0 - 3 dB
Input/Output Impedance:
50 ohms
Input VSWR:
2.0: 1 maximum
Output VSWR:
1.5: 1 maximum
Noise Figure:
6.5 dB maximum
Input Level @ 1 dB Compression:
+6 dBm minimum
Third Order Intercept Point:
+16 dBm minimum
Dynamic Range:
-110 dBm to +6 dBm
Number of RF Inputs:
Two (2)
2MDP-2/215-320
Page 4
MU-DEL ELECTRONICS, INC.
Number of RF Outputs:
Sixteen (16), Eight (8)
each channel
Power:
90 - 260 VAC
47 - 440 Hz
1.2.2 MECHANICAL SPECIFICATIONS
RF Connectors:
SMA Female
Weight:
7 Lbs
Size:
1.75"H x 19"W x
11.5" behind
panel depth
Finish, Front Panel:
Light gray enamel,
color chip 26440,
FED STD 595;
engraved lettering
Black filled
1.3 EQUIPMENT REQUIRED
1.3.1 EQUIPMENT SUPPLIED
One (1) Multicoupler, Model 2MDP-2/215-320
One (1) Three-wire Power Cord with standard polarized plug
One (1) Operational Manual
1.3.2 EQUIPMENT REQUIRED BUT NOT SUPPLIED
The test equipment listed in Section 5.2 is required for troubleshooting, repair and
alignment.
2MDP-2/215-320
MU-DEL ELECTRONICS, INC.
Page 5
SECTION II
INSTALLATION
2.1 UNPACKING
Before unpacking equipment, examine package(s) for evidence of transportation
mishandling or damage. If damage is evident, the equipment should be unpacked and
inspected immediately to detect any shipping damage. Notify the carrier if the equipment is
damaged. Normally the equipment should not be unpacked until ready for installation.
Carefully open containers and remove packing material with care. Empty containers and
packing material should be searched for additional accessories and then stored for future
use.
2.2 MOUNTING
The chassis is designed for mounting in a standard 19-inch rack. When it is mounted, the
power cord is connected on the rear apron and then plugged into the AC line. After the RF
input and output connections are completed, the multicoupler is ready for operation.
2.3 PREPARATION FOR RESHIPMENT
No special preparation for reshipment is required. The original shipping container and
packing material may be used; otherwise good packing techniques should be used to
protect equipment during reshipment.
2MDP-2/215-320
MU-DEL ELECTRONICS, INC.
Page 6
SECTION III
OPERATION
3.1 INTRODUCTION
Only one operating mode exists for the multicoupler. The following paragraphs describe
the controls, indicators and the procedures for turn-on operation and turn-off operation.
3.2 CONTROLS AND INDICATORS
The power ON-OFF switch and indicator lamp are combined into one device on the front
panel. The lamp is illuminated when the switch is depressed to the ON position.
3.3 OPERATING PROCEDURE
3.3.1 TURN-ON
The multicoupler is activated by depressing the POWER ON-OFF switch. Illumination of
the lamp indicates that the power has been applied, that the power supply is functioning,
and the unit should be operating. No warm-up time is required since the unit is solid-state.
3.3.2 OPERATION
Connect the RF input to the antenna, preamplifier output or other signal source and
connect the RF outputs to receivers or other loads.
3.3.3 TURN-OFF
The multicoupler is turned off by depressing the POWER ON-OFF switch. The indicator
lamp will extinguish when power is removed.
2MDP-2/215-320
MU-DEL ELECTRONICS, INC.
Page 7
SECTION IV
THEORY OF OPERATION
4.1 FUNCTIONAL DESCRIPTION
The multicoupler consists of three sections as shown in Figure 4-1; the RF Amplifier (A11,
A21), RF Distribution (A12, A13, A14, A22, A23, A24, ATT11-ATT18, ATT21-ATT28) and
the Power Supply (A3).
The RF input signal in the range of 215 - 320 MHz is applied to the RF Input (J1) of each
channel amplifier (A11, A21). Each signal is amplified approximately 25 dB ± 0.5 dB and
then fed to the RF Distribution modules (A12, A13, A14, A22, A23, A24, ATT11-ATT18,
ATT21-ATT28) where the signal is divided into eight (8) outputs for each channel.
4.2 MODULE AND COMPONENT FUNCTIONAL DESCRIPTION
4.2.1 RF AMPLIFIER A11, A21
Refer to Figure 4-2, The RF Amplifier Schematic Diagram. The amplifiers of both channels
are identical. The amplifiers are a two-stage common-emitter configuration used for
optimum gain and stability.
The RF signal in the 215 - 320 MHz range is applied to the RF INPUT J1 of each channel.
Integrated circuit amplifier Q1 is internally impedance matched. The amplifier has a gain of
approximately 25 dB ± 0.5 dB to overcome the losses in the distribution subsystems and
provide an overall gain of 0-3 dB.
4.2.2 RF DISTRIBUTION A12, A13, A14, A22, A23, A24, ATT11-ATT18, ATT21-ATT28
The amplifier RF output for each channel drives the RF distribution network for that channel
consisting of a two-way hybrid power divider (A12, A22) that feeds two four-way hybrid
power dividers (A13, A14, A23, A24). After the power division, each of the eight RF
outputs is terminated by an attenuator (ATT11-ATT18, ATT21-ATT28). Each of the RF
outputs remains constant regardless of the impedance terminating the other outputs.
Attenuators are selected for the desired gain and isolation between outputs.
4.2.3 POWER SUPPLY A3
The power supply module is designed to provide the regulated 24 volts DC which is
required for the RF amplifier and the power indicator.
MU-DEL ELECTRONICS, INC.
Page 8
FIGURE 4.1 MULTICOUPLER BLOCK DIAGRAM
2MDP-2/215-320
MU-DEL ELECTRONICS, INC.
Page 9
FIGURE 4.2 AMPLIFIER SCHEMATIC DIAGRAM
2MDP-2/215-320
2MDP-2/215-320
MU-DEL ELECTRONICS, INC.
Page 10
SECTION V
MAINTENANCE
5.1 PREVENTIVE MAINTENANCE
The multicoupler is completely solid-state and requires no preventive maintenance.
5.2 CORRECTIVE MAINTENANCE
When removing cover please observe the following warning:
CAUTION!
REMOVE POWER PLUG BEFORE ATTEMPTING TO GAIN ACCESS
TO INSIDE OF UNIT
After removing the top cover from the multicoupler chassis, perform a visual inspection of
the subassemblies. Use a vacuum cleaner or soft brush to remove any buildup of dust.
Dry compressed air not exceeding 25 psi may be used to remove dust.
For troubleshooting, adjustment and alignment of the multicoupler and its subsystems, a
logical step-by-step procedure is presented for determining the source of equipment
malfunction.
The following test equipment is required for alignment and troubleshooting of the
multicoupler.
1.
2.
3.
4.
5.
6.
7.
8.
9.
RF Sweep Generator
Noise Figure Meter
Noise Source
Signal Generator
Test Oscillator
Attenuator
Power Supply
Reflection Coefficient Kit
Network Analyzer
5.2.1 TROUBLESHOOTING
Use Table 5-2 to isolate a fault to the subsystem level. Use the block diagram of Figure
4.1.
2MDP-2/215-320
Page 11
MU-DEL ELECTRONICS, INC.
TABLE 5-1 PARTS LIST
P-BAND MULTICOUPLER
2MDP-2/215-320
SERIAL # 484710-484718
SYMBOL
DESCRIPTION
MU-DEL PART NO.
A11, A21
RF AMPLIFIER
18-70-5394
A12, A22
POWER DIVIDER
32-05-0067
A13, A14, A23, A24
POWER DIVIDER
32-05-0225
ATT11-ATT18
ATTENUATOR
20-25-5512
ATT21-ATT28
ATTENUATOR
20-25-5512
A3
POWER SUPPLY
44-40-0096-01
F1
FUSE
35-02-0500
DS1
LAMP
43-05-0026
VR1
VOLTAGE REGULATOR
44-44-0021
WHEN ORDERING SPARE PARTS
SPECIFY THE MODEL AND THE SERIAL NUMBER OF EACH UNIT
2MDP-2/215-320
Page 12
MU-DEL ELECTRONICS, INC.
TABLE 5-2 FAULT ISOLATION
*****CAUTION*****
The following tests are conducted with line voltage present.
Do not touch any line voltage terminals or wiring.
Before proceeding with the steps outlined in the following table, make sure that AC line voltage is present
at the terminals of the power connector inside the multicoupler and that the wiring to the multicoupler and
inside of same is in good condition.
Symptom
Test
Fault Correction
Multicoupler inoperative, power
indicator lamp does not light.
1a. Check the light bulb inside the
power indicator switch.
If burned, replace bulb.
If ok, proceed to test 1b.
1b. Remove fuse and check
continuity.
If open, replace fuse.
If correct, proceed to test 1c.
1c. Check +24 VDC at power supply
+ terminal.
If absent, replace power supply.
1d. Check +24 VDC at power input
terminal of RF amplifier.
If absent, check wiring.
If present, check indicator light.
2a. Check level of input signal.
If input signal is low or absent,
check source. With correct input
signal, proceed to test 2b.
2b. Check level at all output ports.
If same signal condition exists at all
output ports, proceed to test 2c. If
one or more ports are normal,
proceed to test 2d.
2c. Check gain and frequency
response of RF amplifier
(Par. 4.1).
If not correct, replace amplifier. If
correct, proceed to test 2d.
2d. Check loss of distribution module
for defective channel (s).
If not correct, replace module or
attenuator.
Output signals low or absent.
Mudel
S-Band
Multicoupler
2MDP-2224E
MU-DEL ELECTRONICS, INC.
PAGE
1
TABLE OF CONTENTS
Paragraph
Page
SECTION I: Introduction.............................................................................................. 3
1.1 General Description .......................................................................................... 3
1.1.1 Physical Characteristics............................................................................ 3
1.1.2 Functional Characteristics ........................................................................ 3
1.2 Equipment Characteristics ................................................................................ 3
1.2.1 Electrical Specifications ............................................................................ 3
1.2.2 Mechanical Specifications ........................................................................ 4
1.3 Equipment Required. ........................................................................................ 4
1.3.1 Equipment Supplied.................................................................................. 4
1.3.2 Equipment Required but not Supplied ...................................................... 4
SECTION II: Installation .............................................................................................. 5
2.1 Unpacking ......................................................................................................... 5
2.2 Mounting ........................................................................................................... 5
2.3 Preparation for Reshipment .............................................................................. 5
SECTION III: Operation............................................................................................... 6
3.1 Introduction ....................................................................................................... 6
3.2 Controls and Indicators ..................................................................................... 6
3.3 Operating Procedure......................................................................................... 6
3.3.1 Turn-on ..................................................................................................... 6
3.3.2 Operation.................................................................................................. 6
3.3.3 Turn-off ..................................................................................................... 6
SECTION IV: Theory of Operation. ............................................................................. 7
2MDP-2224E
MU-DEL ELECTRONICS, INC.
Paragraph
PAGE
2
Page
4.1 Functional Description ...................................................................................... 7
4.2 Module and Component Functional Description ............................................... 7
4.2.1 RF Amplifier A11, A21 .............................................................................. 7
4.2.2 RF Distribution A12, A22, ATT1 - ATT4.................................................... 7
4.2.3 Power Supply A3 ...................................................................................... 7
SECTION V: Maintenance. ......................................................................................... 8
5.1 Preventive Maintenance ................................................................................... 8
5.2 Corrective Maintenance .................................................................................... 8
5.2.1 Troubleshooting........................................................................................ 8
ILLUSTRATIONS
Figure No.
Page
4-1 Block Diagram .................................................................................................. 9
4-2 Schematic Diagram, Amplifier........................................................................... 10
TABLES
5-1 Parts List...........................................................................................................11
5-2 Fault Isolation ................................................................................................... 12
2MDP-2224E
MU-DEL ELECTRONICS, INC.
PAGE
3
SECTION I
INTRODUCTION
1.1 General Description
1.1.1 PHYSICAL CHARACTERISTICS
The Model 2MDP-2224E S-Band Multicoupler package design enables it to be mounted
in a standard 19-inch rack; height 1.75" and behind-panel depth of 11". Handles are
provided on the front panel to facilitate installation and removal. The top cover may be
easily removed for access to the interior of the multicoupler. All subsystems are shielded to
reduce electromagnetic radiation and susceptibility. Modular construction techniques are
used, and the active circuits are entirely solid-state. All connections to the unit are made
on its rear apron.
1.1.2 FUNCTIONAL CHARACTERISTICS
The Dual Channel S-Band multicoupler is designed to operate in a telemetry receiving
system covering the frequency range of 2200 - 2400 MHz. Each channel is capable of
driving up to four (4) 50 ohm loads from an RF source with minimum degradation of the
signal. The wide dynamic range and low noise figure provides optimum performance over a
wide range of input signal levels.
1.2 EQUIPMENT CHARACTERISTICS
1.2.1 ELECTRICAL SPECIFICATIONS
Frequency Range:
2200 - 2400 MHz
Gain:
0 - 3 dB
Output to Output Isolation:
50 dB minimum
Output to Input Isolation:
70 dB minimum
Impedance Input to Output:
50 ohms
Input VSWR:
2.1: 1, maximum
Output VSWR:
1.5: 1, maximum
Noise Figure:
6 dB, maximum
Input Level @ 1 dB Gain Compression:
-3 dBm, minimum
2MDP-2224E
MU-DEL ELECTRONICS, INC.
PAGE
Number of RF Inputs:
Two (2)
Number of RF Outputs:
Eight (8) four (4) for each
Channel
Power:
90 - 260 VAC
47-440 Hz
1.2.2 MECHANICAL SPECIFICATIONS
RF Connectors:
N Female
Size:
1.75" H x 19"W x 11"
behind panel depth.
Front Panel:
Light gray enamel,
color chip 26440,
FED STD 595;
engraved lettering,
black filled.
1.3 EQUIPMENT REQUIRED
1.3.1 EQUIPMENT SUPPLIED
One (1) RF Multicoupler, Model 2MDP-2224E
One (1) Three-wire Power Cord with standard polarized plug
One (1) Operational Manual
1.3.2 EQUIPMENT REQUIRED BUT NOT SUPPLIED
The test equipment listed in Section 5.2 is required for troubleshooting, repair and
alignment.
4
2MDP-2224E
MU-DEL ELECTRONICS, INC.
PAGE
5
SECTION II
INSTALLATION
2.1 UNPACKING
Before unpacking equipment, examine package(s) for evidence of transportation
mishandling or damage. If damage is evident, the equipment should be unpacked and
inspected immediately to detect any shipping damage. Notify the carrier if the equipment is
damaged. Normally, the equipment should not be unpacked until ready for installation.
Carefully open containers and remove packing material with care. Empty containers and
packing material should be searched for additional accessories and then stored for future
use.
2.2 MOUNTING
The chassis is designed for mounting in a standard 19-inch rack. When it is mounted, the
power cord is connected on the rear apron and then plugged into the AC line. After the RF
input and output connections are completed, the multicoupler is ready for operation.
2.3 PREPARATION FOR RESHIPMENT
No special preparation for reshipment is required. The original shipping container and
packing material may be used; otherwise good packing techniques should be used to
protect equipment during reshipment.
2MDP-2224E
MU-DEL ELECTRONICS, INC.
PAGE
6
SECTION III
OPERATION
3.1 INTRODUCTION
Only one operating mode exists for the multicoupler. The following paragraphs describe
the controls, indicators and the procedures for turn-on operation and turn-off.
3.2 CONTROLS AND INDICATORS
The power ON-OFF switch and indicator LED are combined into one device on the front
panel. The LED is illuminated when the switch is depressed to the ON position.
3.3 OPERATING PROCEDURE
3.3.1 TURN-ON
The multicoupler is activated by depressing the POWER ON-OFF switch. Illumination of
the LED indicates that the power has been applied, the power supply is functioning, and the
unit should be operating. No warm-up time is required because the active circuits of the
unit are solid-state.
3.3.2 OPERATION
Connect the RF input to the antenna, preamplifier output or other signal source, and
connect the RF outputs to receivers or other loads.
3.3.3 TURN-OFF
The multicoupler is turned off by depressing the POWER ON-OFF switch. The indicator
LED will extinguish when power is removed.
2MDP-2224E
MU-DEL ELECTRONICS, INC.
PAGE
7
SECTION IV
THEORY OF OPERATION
4.1 FUNCTIONAL DESCRIPTION
The multicoupler consists of three sections as shown in Figure 4-1; the RF Amplifier (A11,
A21), RF Distribution (A12, A22) and the Power Supply (A3).
The RF input signal in the range of 2200 to 2400 MHz is applied to each RF Input (J1) of
each channel amplifier (A11, A21). Each signal is amplified approximately 27 dB and then
fed to the RF Distribution modules (A12, A22) where the signal is divided into four (4)
outputs for each channel.
4.2 MODULE AND COMPONENT FUNCTIONAL DESCRIPTION
4.2.1 RF AMPLIFIER A11, A21
Refer to Figure 4-2, The RF Amplifier Schematic Diagram. The amplifiers of both channels
are identical. They consist of two stages, each stage configured as common emitter
amplifiers for optimum gain and stability.
The RF signal in the 2200 - 2400 MHz range is applied to the RF INPUT J1 of each
channel. The signal is applied to the base of Q1. Integrated circuit amplifier Q1 is
internally impedance matched.
The interconnecting resistor is used to adjust overall gain of the amplifier. The output
device, Q2, is a power amplifier capable of handling the required output power. Overall
gain of the amplifier is 27 dB ± 1.5 dB.
4.2.2 POWER DIVIDER A12, A22, ATT1 - ATT4
The amplifier RF output for each channel drives the RF distribution network for that channel
consisting of a four-way power divider. After the power division, each of the four RF
outputs is terminated by an attenuator. Each of the RF outputs remains constant
regardless of the impedance terminating the other outputs. Attenuators are selected for the
desired gain and isolation between outputs.
4.2.3 POWER SUPPLY A3
The power supply module is designed to provide the regulated +12 volts DC required by
the RF amplifiers and the power indicator.
2MDP-2224E
MU-DEL ELECTRONICS, INC.
PAGE
8
SECTION V
MAINTENANCE
5.1 PREVENTIVE MAINTENANCE
The active circuits of the multicoupler are completely solid-state devices and require no
preventive maintenance.
5.2 CORRECTIVE MAINTENANCE
When removing the cover please observe the following:
CAUTION!
REMOVE POWER PLUG BEFORE ATTEMPTING TO GAIN ACCESS
TO INSIDE OF UNIT
After removing the top cover from the multicoupler chassis, perform a visual inspection of
the subassemblies. Use a vacuum cleaner or soft brush to remove any buildup of dust.
Dry compressed air not exceeding 25 psi may be used to remove dust.
For troubleshooting, adjustment and alignment of the multicoupler and its subsystems, a
logical step-by-step procedure is presented for determining the source of equipment
malfunctions.
The following test equipment is required for alignment and troubleshooting of the
multicoupler.
1.
2.
3.
4.
5.
6.
7.
8.
9.
RF Sweep Generator
Noise Figure Meter
Noise Source
Signal Generator
Test Oscillator
Attenuator
Power Supply
Reflection Coefficient Kit
Network Analyzer
5.2.1 TROUBLESHOOTING
Use Table 5-2 to isolate faults to the subsystem level. Use the block diagram of Figure 4.1.
MU-DEL ELECTRONICS, INC.
PAGE
9
FIGURE 4.1 BLOCK DIAGRAM
2MDP-2224E
MU-DEL ELECTRONICS, INC.
PAGE
10
FIGURE 4.2 AMPLIFIER SCHEMATIC DIAGRAM
2MDP-2224E
2MDP-2224E
MU-DEL ELECTRONICS, INC.
PAGE
PARTS LIST
S - BAND MULTICOUPLER
2MDP-2224E
SERIAL # 490203
SYMBOL
DESCRIPTION
MU-DEL PART NO.
A11, A21
RF AMPLIFIER
18-70-5178
A12, A22
POWER DIVIDER
32-05-0033-04
ATT1 - ATT4
ATTENUATOR
20-26-5510
A3
POWER SUPPLY
44-40-0103
F1
FUSE
32-02-1000
DS1
LED
43-05-0026
S1
POWER SWITCH
53-80-0033
WHEN ORDERING SPARE PARTS
SPECIFY THE MODEL AND SERIAL NUMBER OF EACH UNIT
11
2MDP-2224E
MU-DEL ELECTRONICS, INC.
PAGE
12
TABLE 5-2. FAULT ISOLATION
*****CAUTION*****
The following tests are conducted with line voltage present.
Do not touch any line voltage terminals or wiring.
Before proceeding with the steps outlined in the following table, make sure that AC line voltage is present
at the terminals of the power connector inside the multicoupler and that the wiring to and inside the
multicoupler is in good condition.
Symptom
Test
Fault Correction
Multicoupler inoperative,
power indicator LED does not
light.
1a. Remove fuse and check
continuity.
If open, replace fuse.
If correct, proceed to test 1b.
1b. Check +12 V DC at power supply
+ terminal.
If absent, replace power supply.
1c. Check +12 V DC at power input
terminal of RF amplifier.
If absent, check wiring.
If present, check indicator light.
2a. Check level of input signal.
If input signal is low or absent, check
source. With correct input signal,
proceed to test 2b.
2b. Check level at all output ports.
If same signal condition exists at all
output ports, proceed to test 2c. If
one or more ports are normal,
proceed to test 2d.
2c. Check gain and frequency
response of RF amplifier
(Par. 4.2.1).
If not correct, replace amplifier. If
correct, proceed to test 2d.
2d. Check loss of distribution module
for defective channel (s).
If not correct, replace module or
attenuator.
Output signals low or absent.
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