RF Central RFX-RMR User manual

RFX-RMR Issue 1.0 page 1 of 41
RACK MOUNT RECEIVER (RFX-RMR)
OPERATORS MANUAL
Copyright 2005 RF Central

RFX-RMR Issue 1.0 page 2 of 41
CONTENTS
1GENERAL SAFETY INFORMATION..............................................................................................4
1.1 Health & Safety.......................................................................................................................5
1.2 Maximum RF Power Density Limits ........................................................................................6
1.3 Issue Status ............................................................................................................................6
2INTRODUCTION.............................................................................................................................7
3SPECIFICATIONS..........................................................................................................................8
4OVERVIEW OF RFX-RMR RECEIVER........................................................................................10
5FRONT PANEL CONTROLS........................................................................................................12
6REAR PANEL CONNECTIONS....................................................................................................13
6.1 RF I/P....................................................................................................................................13
6.2 Digital Receive Section - Video output (BNC connectors) ....................................................13
6.3 Analog Receive Section – Video output (BNC connector)....................................................13
6.4 Digital Receive Section Analog - Audio outputs (XLR connectors).......................................13
6.5 Analog Receive Section Analog - Audio outputs (XLR connectors)......................................14
6.6 Power Connector ..................................................................................................................14
6.7 User data (future option).......................................................................................................14
6.8 Remote Monitoring and Control ............................................................................................15
6.9 IF monitor..............................................................................................................................15
6.10 Auxiliary connector................................................................................................................15
7CIRCUIT DESCRIPTIONS............................................................................................................16
Module locations...............................................................................................................................16
7.1 1st Down-converter................................................................................................................17
7.2 “3 in 1” Multi Down-converter................................................................................................18
7.3 COFDM demodulator/MPEG decoder Board........................................................................19
7.4 ANALOG DEMODULATOR – TECHNICAL DESCRIPTION. ...............................................20
8INTRODUCTION...........................................................................................................................21
8.1 R.F. input circuit operation. ...................................................................................................21
8.2 Base-band video processing.................................................................................................21
8.3 A1 and A2 audio demodulators.............................................................................................21
8.4 Analog demodulator Power supplies and monitoring............................................................22
8.5 Front Panel Controller / Display Board..................................................................................22
8.6 Mother Board ........................................................................................................................23
8.7 RFX-RMR - Power supplies and monitoring .........................................................................25
9CONFIGURING THE RECEIVER.................................................................................................26
9.1 “Switches” and Key pad” control modes ...............................................................................26
9.2 Status Monitoring..................................................................................................................26
9.3 Top level Menu......................................................................................................................26
9.3.1 Initialization Menu.................................................................................................... 26
9.3.2 Top level and Current Operational State................................................................. 27
9.4 Operational menu –Digital RX mode.....................................................................................27
9.4.1 Ch / Frequency Menu.............................................................................................. 27
9.4.2 Rx mode .................................................................................................................. 27
9.4.3 Audio 1 Menu........................................................................................................... 27
9.5 Engineering Menu – Digital receiving mode..........................................................................28
9.5.1 “Switches and Key-pad” Control Mode.................................................................... 28
9.5.2 SW Inventory........................................................................................................... 28

RFX-RMR Issue 1.0 page 3 of 41
9.5.3 Channel Plan........................................................................................................... 28
9.5.4 Video Format........................................................................................................... 28
9.5.5 Video Output Configuration ..................................................................................... 28
9.5.6 SDI / ASI Output Configuration................................................................................ 29
9.5.7 ASI Output Format................................................................................................... 29
9.5.8 Aux. supply.............................................................................................................. 29
9.5.9 Relay 1 and Relay 2 ................................................................................................ 29
9.5.10 LCD Timeout............................................................................................................ 29
9.5.11 Audio offset.............................................................................................................. 30
9.5.12 Prog Channels......................................................................................................... 30
9.6 Operations Menu – Analog mode .........................................................................................30
9.6.1 Ch / Frequency Menu.............................................................................................. 30
9.6.2 Rx mode .................................................................................................................. 30
9.7 Engineering Menu – Analog mode........................................................................................30
9.7.1 “Switches and Key-pad” Control Mode.................................................................... 30
9.7.2 SW Inventory........................................................................................................... 30
9.7.3 Channel Plan........................................................................................................... 31
9.7.4 Audio frequency 1 and 2.......................................................................................... 31
9.7.5 Aux. supply.............................................................................................................. 31
9.7.6 Relay 1 and Relay 2 ................................................................................................ 31
9.7.7 LCD Timeout............................................................................................................ 31
9.7.8 Prog Channels......................................................................................................... 31
10 PREPARING FOR OPERATION..............................................................................................37
10.1 The RFX-RMR Receiver .......................................................................................................37
10.1.1 Antennas.................................................................................................................. 37
10.1.2 Checks..................................................................................................................... 37
10.2 The Transmitting Equipment.................................................................................................38
10.3 Transmitter / Receiver tests ..................................................................................................38
11 SYSTEM REMOTE MONITORING AND SETUP.....................................................................39
12 APPENDIX A - MPEG ENCODER PARAMETER SETS..........................................................40
13 APPENDIX B - TABLE OF DVB-T NON-HIERARCHICAL BIT RATES....................................41
The information contained in this manual is the property of RF Central and may not be used, disclosed, or reproduced in any
other form without the prior written permission of RF Central.
RF Central reserves the right to alter the equipment and specification appertaining to the equipment described in this manual
without notification.

RFX-RMR Issue 1.0 page 4 of 41
1 GENERAL SAFETY INFORMATION
The information that follows, together with local site regulations, should be studied by
personnel involved with the operation or maintenance of this equipment, to ensure awareness
of potential hazards.
WARNING- RF Power Hazard: High levels of RF power are present in the unit. Exposure to RF or
microwave power can cause burns and may be harmful to health.
Switch off supplies before removing covers or disconnecting any RF cables, and before inspecting
damaged cables or antennas.
Avoid standing in front of high gain antennas (such as a dish) and never look into the open end of a
waveguide or cable where RF power may be present.
Users are strongly recommended to return any equipment that requires RF servicing to RF Central.
WARNING- GaAs / BeO Hazard: Certain components inside the equipment contain Gallium Arsenide
and Beryllium Oxide that are toxic substances. Whilst safe to handle under normal circumstances,
individual components must not be cut, broken apart, incinerated, or chemically processed. In the
case of Beryllium Oxide, a white ceramic material, the principal hazard is from the dust or fumes which
are carcinogenic if ingested, inhaled, or entering damaged skin.
Please consult your local authority before disposing of these components.
CAUTION - Tantalum Capacitors: When subjected to reverse or excess forward voltage, ripple
current or temperature these components may rupture and could potentially cause personal injury.
CAUTION: This system contains MOS devices. Electro-Static Discharge (ESD) precautions should be
employed to prevent accidental damage.

RFX-RMR Issue 1.0 page 5 of 41
1.1 Health & Safety
Exposure to Non-Ionizing (RF) Radiation/Safe Working Distances
The safe working distance from a transmitting antenna may be calculated from the relationship:
D = √ PT. GR
4π.w
In which D = safe working distance (meters)
PT = transmitter or combiner power output (watts)
GR = antenna gain ratio = anti log (gain dBi ÷10)
w = power density (watts/square meter)
The RF power density value is determined by reference to safety guidelines for exposure of the
human body to non-ionizing radiation. It is important to note that the guidelines adopted differ
throughout the world and are from time-to-time re-issued with revised guidelines. For RF Central use,
a maximum power density limit of 1w/m² is to be applied when calculating minimum safe working
distances.
Important Note: It must be remembered that any transmitting equipment radiating power at
frequencies of 100 kHz and higher, has the potential to produce thermal and athermal effects upon the
human body.
To be safe:
a) Operators should not stand or walk in front of any antenna, nor should they allow anyone else
to do so.
b) Operators should not operate any RF transmitter or power amplifier with any of its covers
removed, nor should they allow anyone else to do so.
Worked examples
Antenna Transmitter Power
Type Gain (dBi) Gain Ratio 2W 4W 10W 30W
OMNI 4 2.5 1 1 1.5 2.5
HELIX 20 100 4 5.6 9 15.5
PARABOLIC
DISH 35 3,162 22.5 32 50 87
MINIMUM SAFE DISTANCE (METERS)

RFX-RMR Issue 1.0 page 6 of 41
1.2 Maximum RF Power Density Limits
The RF Radiation Power Density limit figure recommended by RF Central is based upon guideline
levels published in:
a. IEEE standard C95.1 1999 - IEEE Standard for Safety Levels with respect to Human Exposure
to Radio Frequency Electromagnetic Fields, 3 kHz to 300 GHz.
b. Guidelines for Limiting Exposure to Time-varying Electric, Magnetic & Electromagnetic Fields
(up to 300 GHz) published in 1998 by the Secretariat of the International Commission on Non-Ionizing
Radiation Protection (ICNIRP).
Both documents define guideline RF power density limits for "Controlled" and "Uncontrolled"
environments. An uncontrolled environment is defined as one in which the person subjected to the RF
radiation may be unaware of and has no control over the radiation energy received. The uncontrolled
environment conditions can arise, even in the best-regulated operations and for this reason the limits
defined for the uncontrolled environment have been assumed for the RF Central recommended limit.
Documents a) and b) also show the RF power density guidelines to be frequency dependent. Different
power density / frequency characteristics are presented in the two documents. To avoid complexity
and to avoid areas of uncertainty, RF Central recommends the use of a single power density limit
across the frequency range 100 kHz to 300 GHz. The 1w/m² power density limit we recommend
satisfies the most stringent of the guidelines published to date.
Footnote: The IICNIRP document may be freely downloaded from the internet at
www.icnirp.de/documents/emfgdl.pdf (PDF file).
1.3 Issue Status
Issue Date Changes
Issue 1.0 November 2006 First issue

RFX-RMR Issue 1.0 page 7 of 41
2 INTRODUCTION
This manual is to be used in conjunction with the RFX-RMR rack-mount switchable analog/digital
Receiver. When in digital mode the RFX-RMR offers significant features including ASI, SDI, composite
and component video outputs together with 4 audios (analog, AES digital). In analog mode the
receiver offers composite video and 2 audios.
The RF Central RFX-RMR is designed for permanent rack-mounted applications, such as ENG
truck/vehicle or fixed link applications. The Receiver comprises a 19” inch rack mount (2 ‘U’) unit that
contains both a digital and analog section, with common power supplies.
The digital section of the Receiver comprises a COFDM demodulator, video decoder, and audio
decoder. The analog section comprises an integral FM demodulator for one video channel with two
associated audio channels.
The RFX-RMR has a common RF input for both analog and digital receive modes, selection of mode
is via the front panel control push button selection and LCD display.
At the transmit site a range of RF Central analog/digital transmitters may be used. Examples include
the RFX-RMT switchable analog/digital rack mounted transmitter, the RFX-PHT 5 watt portable
transmitter or the RFX-CMT “Clip-On” camera mount transmitter. Please consult the separate manual
for information detailing the operation of transmitters.

RFX-RMR Issue 1.0 page 8 of 41
3 SPECIFICATIONS
Frequency Band 1.97 – 2.50GHz band
Tuning Range As per US BAS allocation (current and future plans)
Receiver Noise Factor 4dB (nom.)
IF Frequencies 1st IF In the range 600-1500MHz
2nd IF 70MHz
Digital Receiver Specifications
Receiver Threshold -92dBm to BER 10-5 (nom., QPSK)
Receive Antenna Compatible with all RF Central antennas
Demodulation COFDM DVB-T 2k
Demodulation Modes QPSK, 16QAM, 64QAM
FEC: 1/22/33/45/67/8
Guard interval: 1/32 1/16 1/81/4
Data Rate 4.98 to 31.7 Mbit/s (automatic selection)
Bandwidth 8MHz (7 & 6MHz automatic selection)
Decoding Options MPEG 2 4:2:0/4:2:2 high quality video (DVB standard)
Latency Selectable to less than 2 frames minimum, Tx to Rx
Video Output Digital: SDI 270Mbit/s
Analog: Y/C component (qty 1) or composite (PAL/NTSC) (qty
2)
Genlock Optional (PAL/NTSC)
ASI Output ASI transport stream (selectable 188, 204, byte)
Audio Output Digital: 2 x AES3 outputs
Analog: 2 x stereo / 4 x mono outputs
Analog Receiver Specifications
Video Performance
Signal-to-Noise 55dB min. (LW)
LF Noise 50dB min.
Frequency Response 2.5dB to 5.8GHz
Differential Phase 2 degrees
Differential Gain 2%
Field tilt 3%K
Chrom/Lum Gain 2dB
Chrom/Lum Delay 25ns
Linearity 2.5%
Audio Performance

RFX-RMR Issue 1.0 page 9 of 41
No. of Channels 2
Sub-Carriers Audio1 4.5 to 5.1MHz, Audio2 5.5 to 6.2MHz
(selectable by front panel control)
De-emphasis 75 µS
Levels +9dBm balanced line level out, for 200kHz peak-to-peak deviation.
Audio Performance (analog receiver)
Frequency Response ±1.0dB 50Hz to 12kHz
Distortion 2% max.
Signal-to-Noise 50dB
Control and Monitoring Menu selectable via the front panel control
COFDM demodulator / MPEG 2 decoder parameters
RF Received signal level
CSI
BER
Summary front panel alarm / comprehensive internal lock alarms
Power Supply 11 to 18V DC. 30 Watts
Mechanical Interface Tripods, mast, scaffold and special mounts available.
Size 2 U rack mount, Depth 350mm
Weight 7.0kg
Environmental Safe use: -20° to +50°C
To spec: -10° to +45°C
Altitude: 4500m
Humidity: 95% long term
Specifications may alter at the discretion of RF Central or to meet customer specific requirements.

RFX-RMR Issue 1.0 page 10 of 41
4 OVERVIEW OF RFX-RMR RECEIVER
RF input
Motherboard
Multi down
converter
Front Panel
Module
1s
t
down
converter
Analog
Receiver
Module
70MHz
IF amp.
630MHz filter
COFDM
demodulator
and MPEG
decoder
The RFX-RMR comprises six main modules or assemblies:-
1. Motherboard. This board accommodates the COFDM demodulator and MPEG digital decoder
boards, as well as providing DC, signal, and I2C communications routing to/from all other
modules. The motherboard also has a 70MHz buffer amplifier on it. The DC PSU is mounted
on the under-side.
2. 1st Down-converter. This module accepts the receiver RF input, includes the PLL for receiver
tuning, and outputs an IF of 630MHz to the multi down-converter

RFX-RMR Issue 1.0 page 11 of 41
3. Multi down-converter. This module accepts the 630MHz IF from the 1st down-converter and
down-converts this to 70MHz, and then to the third IF of 4.57MHz for the COFDM
demodulator. The 630MHz filter is mounted on this module.
4. COFDM demodulator and MPEG decoder. The module provides multiple functions including:
- COFDM demodulator, MPEG decoder, PAL/NTSC encoding, ASI/SDI routing, Analog audio
D/A converter, AES audio encoder, Genlock, and user data extraction.
5. Analog receiver module. This module accepts a feed of 70MHz from the Multi down-
converter via a 70MHz amplifier/splitter mounted on the Motherboard. The module
demodulates the video and 2 audios when the RFX-RMR is in analog receive mode.
6. Front panel module. This module contains a microprocessor plus six push buttons and an
LCD display for overall monitoring and control of the RFX-RMR.

RFX-RMR Issue 1.0 page 12 of 41
5 FRONT PANEL CONTROLS
Front panel view of the RFX-RMR
The front panel of an RFX-RMR comprises two 2-way switches (On/Off and Analog/Digital), a 10-way
rotary switch (BAS channel number), six push button switches (used to navigate the various RFX-
RMR menus) and an LCD display.
Also fitted are three LEDs – ‘DC’ (Green), ‘Status’ (bi-color green/red), and ‘Local’ (bi-color green and
amber)
On/Off Switch Down for Off, up for On
Digital/Analog switch Down = Analog transmission, Up = Digital transmission. This function
can also be controlled via the push buttons and RFX-RMR menus.
Channel Rotary, 0-10. 1= BAS channel 1, 2 = BAS channel 2, etc to 0 = BAS
channel 10. Please note that the BAS channels can be switched between the ‘current’ plan and the
‘new’ plan via the push buttons and RFX-RMR menus. The exact frequency selected by either method
is shown on the top menu page on the LCD display.
‘DC’ LED Lit green whenever a correct DC voltage is presented to the RFX-RMR
Receiver. This LED will be lit irrespective of whether the unit is switched ‘on’ or ‘off’.
Status LED Stable Green indicates that the RFX-RMR is functioning correctly. A
flashing green light indicates that the RFX-RMR is functioning correctly but that no valid RF signal is
present at the input to the receiver. A stable red light indicates that the unit has an alarm condition.
Local LED Indicates whether the ‘channel’ and ‘analog/digital’ switching controls are
being accepted from the front panel rocker switches or from the push button menu. Green light =
rocker switch operation, amber light = push button menu operation.
Full details of the push button menu structure can be found in section 8.

RFX-RMR Issue 1.0 page 13 of 41
6 REAR PANEL CONNECTIONS
Rear Panel view of RFX-RMR showing all connections
6.1 RF I/P
Connector Type: 50Ω‘N’ type (female)
6.2 Digital Receive Section - Video output (BNC connectors)
Connectors for SDI/ASI digital (2), these connectors may be independently configured from the
keypad to output either ASI or SDI.
Composite analog (2) or component analog (Y/C) video, selected via front panel keypad.
75ΩBNC connectors (female)
6.3 Analog Receive Section – Video output (BNC connector)
Connector for composite video output, 75ΩBNC connector (female)
6.4 Digital Receive Section Analog - Audio outputs (XLR connectors)
The four channels of analog audio are connected via four 3pin XLR male connectors. The connectors
are designated Ch1, Ch2, Ch3, and Ch4. These outputs can be independently selected for adjustable
gain, via the front panel keypad
Pin
1 Analog Ground
2 Ch1/ A / Left +
3 Ch1/ A / Left -
The two channels of AES EBU stereo digital audio are connected via two-3pin XLR male

RFX-RMR Issue 1.0 page 14 of 41
Connectors: The connectors are designated Ch1 and Ch2.
Pin
1 Ground
2 Hot/ +
3 Return/ -
6.5 Analog Receive Section Analog - Audio outputs (XLR connectors)
600Ωbalanced Z
The two analog audio channels are connected via two 3pin XLR male connectors. The
connectors are designated Ch1 and Ch2.
Pin
1 Analog Ground
2 Ch1/ A / Left +
3 Ch1/ A / Left -
6.6 Power Connector
Connector Type: 4 pin XLR connector (male)
Input range: 11 to 18V DC nominal
Pin Function
1 +12VDC
2 Not Used
3 Not Used
4 0V
6.7 User data (future option)
Connector Type: 9-way ‘D’ type, female
Remote Control and Monitoring interface selectable as RS485 or RS232
(future option)
RS232 CONNECTIONS RS485 CONNECTIONS
Pin Direction Direction
1 Not Used Not Used
2 Data Tx Out from Unit Data Tx (-) Out from Unit
3 Data Rx Into Unit Data Rx (-) Into Unit
4 Not Used Not Used
5 Ground Ground
6 Not Used Data Tx (+) Out from Unit
7 Not Used Data Rx (+) Into Unit
8 Not Used Not Used
9 Not Used Not Used

RFX-RMR Issue 1.0 page 15 of 41
6.8 Remote Monitoring and Control
Connector Type: 9-way ‘D’ type, female
Remote Control and Monitoring interface selectable as RS485 or RS232
(Future option)
RS232 CONNECTIONS RS485 CONNECTIONS
Pin Direction Direction
1 Not Used Not Used
2 Data Tx Out from Unit Data Tx (-) Out from Unit
3 Data Rx Into Unit Data Rx (-) Into Unit
4 Not Used Not Used
5 Ground Ground
6 Not Used Data Tx (+) Out from Unit
7 Not Used Data Rx (+) Into Unit
8 Not Used Not Used
9 Not Used Not Used
6.9 IF monitor
Connector for 70 MHz IF monitoring receiver
BNC connector (female)
6.10 Auxiliary connector
Connector Type: 15-way ‘D’ type, female
Auxiliary functions, e.g. powering of a remote LNA and remote switching
Pin Pin
1 +12VDC 9 Ground
2 +12VDC 10 Ground
3 RL1 N.O 11 RL1 COMMON
4 RL1 N.C 12 Ground
5 RL2 N.O 13 RL2 COMMON
6 RL2 N.C 14 Ground
7 reserved 15 Ground
8 External AGC level
meter 0 to +5VDC

RFX-RMR Issue 1.0 page 16 of 41
7 CIRCUIT DESCRIPTIONS
RFX-RMR Simplified block diagram
COFDM
Demodulator
MPEG decoder
RF input
SDI or ASI video (1)
CVBS (2), or C video
AES audio 1, 2
Analog audio 1
Analog audio 2
AES audio 3, 4
RMR RX
Simplified block diagram
Front panel display
and push button control
Power supply
Mother board
Multi Downconverter
1st
Downconverter
SDI or ASI video (2)
CVBS (1), or Y video
11 to 18 VDC
30v, +/-12v +/- 12v
I2C
I2C I2C
630MHz
Analogue
receiver
Composite
Analogue audio 1
Analogue audio 2
Analog audio 3
Analog audio 4
Genlock
70MHz monitor
70MHz
70MHz
+12v
+12v
4.57MHz
Module locations
Refer to the photograph in section 4 for location of the main sub units of the receiver

RFX-RMR Issue 1.0 page 17 of 41
7.1 1st Down-converter
The first down-converter is mounted as shown in the photograph in section 4
The RF signal enters the receiver unit via a standard ‘N type’ connector on the rear of the unit. The
unit contains a local oscillator, which tunes according to an offset appropriate to the receiver operating
frequency and is controlled by the front panel push button display system. The output frequency of the
first down-converter is 630MHz.
RF input
RMR RX
1st Down-converter
Front panel display
RF frequency control VCO/PLL
LNA
LO
Mixer
BP filter
630MHz to 2nd
Down-conv input

RFX-RMR Issue 1.0 page 18 of 41
7.2 “3 in 1” Multi Down-converter
This board is mounted onto the motherboard as shown in the picture in section 4
The first part of the “3 in 1” multi down-converter accepts 630MHz at its input and converts this to
70MHz. The second part amplifies the 70MHz, applies AGC (automatic gain control), and passes this
signal to the final part which down-converts the signal to 4.57MHz.
A balanced form of the 4.57MHz IF is then passed to the COFDM demodulator board as detailed in
section 7.3
The module contains a 20MHz reference oscillator to lock the two mixer local oscillators.
There are no user serviceable parts on this module. Please contact RF Central Service Department
for maintenance of this unit
RMR RX
3 in 1 Multi down-converter Down-converter
780MHz
PLL/LO
MixerBP filter
4.57MHz balanced
baseband to
demodulator
65.43MHz
PLL/LO
REF
OSC.
AGC
detector
70MHz
70MHz
BP filter
BP filter
630MHz from
1st downconverter To analog RX
and IF monitor

RFX-RMR Issue 1.0 page 19 of 41
7.3 COFDM demodulator/MPEG decoder Board
SDI or ASI (1)
CVBS (2), or C video
AES audio 1, 2
Analog audio 2
Analog audio 3
AES audio 3, 4
RMR-D RX
Demodulator/Decoder
Simplified block diagram
Front panel display
and push button control
MPEG
decoder
SDI or ASI (2)
COFDM
Demod
SDI
seialiser
ASI
serialiser
PAL/NTSC
encoder
switches
Sync
seperator
Audio
D to A
Audio
AES
encoder
Micro
controller
RS232/485
interface
I2C to all units
(details not shown)
switches
FPGA
I2C
4.57MHz balanced baseband
from downconverter
Genlock
User data
CVBS (1), or Y video
Genlock input
Analog audio 4
Analog audio 1
This board is mounted onto the motherboard as shown in the picture in section 4
The module provides multiple functions including: - COFDM demodulator, MPEG decoder, PAL/NTSC
encoding, ASI/SDI routing, Analog audio D/A converter, AES audio encoder, Genlock, and user data
extraction.
The heart of the unit is an FPGA which deals with signal routing and control.
The video, audio, and data outputs are routed via the motherboard to the rear panel of the receiver.
The unit is controlled by the Front Panel display module.
There are no user serviceable parts on this module. Please contact RF Central Service Department
for maintenance of this unit

RFX-RMR Issue 1.0 page 20 of 41
7.4 ANALOG DEMODULATOR – TECHNICAL DESCRIPTION.
Power
supply
70MHz
demod
Analogue Module
Composite video
Analog audio 1
Analogaudio2
Audio Subcarrier
Modulator 1
Audio Subcarrier
Modulator 2
Video Filter/
de-emphasis
Hi/lo video
deviation
switching
Buffer
Amp
Buffer
Amp
Black level
lamp
Control lines
RMR-D RX
Analog receicer
Simplified block diagram
+12 v +5 v
-5 v
-17Bm