Quasonix Compact RDMS Telemetry Receiver-Combiner User manual

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Quasonix, Inc.
Copyright Quasonix, Inc., All Rights Reserved.
Installation and Operation Manual
3rd Generation Dual Channel
Compact RDMSTM Telemetry Receiver-Combiner
Quasonix, Inc.
6025 Schumacher Park Dr.
West Chester, OH 45069
01 May 2022
Revision 1.0
Applies to RDMS™System Version 19.3
Specifications subject to change without notice.
All Quasonix receiver products are under U.S. Department of Commerce jurisdiction categorized as
5A991; not covered by ITAR

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Table of Contents
1Introduction ............................................................................................................................................1
1.1 Description...................................................................................................................................1
1.2 Nomenclature ..............................................................................................................................2
1.2.1 Options....................................................................................................................................2
1.2.2 Detailed Option Descriptions...................................................................................................3
1.2.2.1 SAW Filter Option –14 .......................................................................................................3
1.2.2.2 Cybersecurity –CS, CS1, CS2...........................................................................................3
1.2.2.3 Adaptive Equalizer - EQ......................................................................................................3
1.2.2.4 Viterbi Decoder (for Legacy PSK Only) - K7.......................................................................3
1.2.3 Band Configurations................................................................................................................5
1.2.3.1 Additional Band Codes .......................................................................................................6
1.3 Package Contents .......................................................................................................................6
2Specifications.........................................................................................................................................7
3Installation Instructions ........................................................................................................................10
3.1 Mechanical.................................................................................................................................10
3.2 Thermal......................................................................................................................................12
3.3 Electrical ....................................................................................................................................12
3.3.1 CRC Front Panel Connections..............................................................................................12
3.3.2 Front Panel Connections.......................................................................................................13
3.3.3 Electrical Signals...................................................................................................................15
4Operating Instructions..........................................................................................................................17
4.1 Power-on Operation...................................................................................................................17
4.2 Reset IP Address to Default ......................................................................................................17
5Browser Interface.................................................................................................................................19
5.1 Network Screen .........................................................................................................................19
5.2 Monitor Screen ..........................................................................................................................21
5.2.1 Signal Graph and Signal Indicators.......................................................................................24

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5.2.2 Spectrum Graph....................................................................................................................26
5.2.3 Diversity Combiner................................................................................................................27
5.2.3.1 Best Channel Selector Status...........................................................................................28
5.2.4 Monitor Selective Display Options.........................................................................................31
5.2.5 Client Level Update Rate ......................................................................................................33
5.3 Configure Screen.......................................................................................................................34
5.4 Combiner ...................................................................................................................................34
5.4.1.1 Frequency Diversity ..........................................................................................................35
5.4.2 Channel Selection and Basic Settings ..................................................................................35
5.4.2.1 Power Ratio (UQPSK Mode Only)....................................................................................37
5.4.2.2 AQPSK Mode....................................................................................................................37
5.4.2.3 Playback Demodulator......................................................................................................38
5.4.2.4 Data and Clock Polarity Settings ......................................................................................38
5.4.2.5 Data Quality Encapsulation (DQE) ...................................................................................39
5.4.2.6 Derandomizer Settings .....................................................................................................41
5.4.2.7 Differential Decoding Settings (SOQPSK Only) ...............................................................42
5.4.3 Configure Advanced Settings................................................................................................42
5.4.3.1 Measured Bit Rate Setting................................................................................................43
5.4.3.2 IF Filter..............................................................................................................................43
5.4.3.3 Output Muting....................................................................................................................44
5.4.3.4 Muting Timeout .................................................................................................................44
5.4.3.5 AFC Mode.........................................................................................................................44
5.4.3.5.1 AFC Mode –Track...................................................................................................45
5.4.3.5.2 AFC Mode –Hold....................................................................................................45
5.4.3.5.3 AFC Mode –Off.......................................................................................................45
5.4.3.6 Best Channel Selector ......................................................................................................45
5.4.3.7 Time Aligner......................................................................................................................47
5.4.4 PCM Encoding.......................................................................................................................48
5.4.5 Channel A Video Output........................................................................................................49
5.4.6 Channel B Video Output........................................................................................................50
5.4.7 Channel A Video Scale .........................................................................................................50

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5.4.8 Channel B Video Scale .........................................................................................................51
5.4.9 Tape Output Frequency ........................................................................................................51
5.4.10 FM De-emphasis (PCM/FM Mode Only)...............................................................................51
5.4.11 Forward Error Correction.......................................................................................................51
5.4.11.1 LDPC Mode (SOQPSKLDPC or STCLDPC Modes Only) ...........................................52
5.4.11.2 Viterbi Decoder (K7 Option Required) (Legacy PSK modes only)...............................54
5.4.11.3 Convolutional Symbol...................................................................................................54
5.4.11.4 Reed-Solomon Decoder (K7 Option Required) (Legacy PSK modes only).................56
5.4.11.5 Interleave Depth (K7 Option Required) (Legacy PSK modes only) .............................57
5.4.12 Advanced PCM/FM Settings .................................................................................................57
5.4.12.1 Modulation Index Scaling Mode ...................................................................................57
5.4.12.1.1 Modulation Scaling –Track ...................................................................................58
5.4.12.1.2 Modulation Scaling –Hold.....................................................................................59
5.4.12.1.3 Modulation Scaling –Off .......................................................................................60
5.4.12.1.4 Modulation Scaling –Acquire................................................................................61
5.4.12.2 Modulation Persistence ................................................................................................61
5.4.12.3 Mod Scale Index...........................................................................................................62
5.4.12.4 Phase Noise Compensation.........................................................................................63
5.4.13 System Settings.....................................................................................................................64
5.4.13.1 Antenna Controls..........................................................................................................64
5.4.13.2 HyperTrack ...................................................................................................................65
5.4.13.3 AGC Polarity.................................................................................................................66
5.4.13.4 AGC Scale....................................................................................................................66
5.4.13.5 AGC Time Constant......................................................................................................67
5.4.13.6 AGC Freeze..................................................................................................................67
5.4.13.7 AGC Zero Mode............................................................................................................68
5.4.13.8 AGC Compensate.........................................................................................................68
5.4.13.9 AM Bandwidth...............................................................................................................68
5.4.13.10 AM Polarity ...................................................................................................................68
5.4.13.11 AM Scale ......................................................................................................................69
5.4.13.12 Downconvert Antenna ..................................................................................................69

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5.4.14 Clock/Data Output Controls...................................................................................................70
5.4.15 Test Utilities...........................................................................................................................71
5.4.15.1 Noise Generator ...........................................................................................................72
5.4.15.2 Data Generator.............................................................................................................73
5.4.15.3 BERT ............................................................................................................................75
5.4.15.3.1 BERT Settings.......................................................................................................75
5.4.15.3.2 BERT Measurement Status...................................................................................78
5.4.16 Zero AGC Button...................................................................................................................79
5.4.16.1 RSSI Display.................................................................................................................81
5.4.17 Reset to Factory Defaults Button ..........................................................................................82
5.4.18 Shutdown Hardware Button ..................................................................................................82
5.4.19 Reboot System Button ..........................................................................................................83
5.4.20 Save Receiver Settings Button..............................................................................................83
5.5 Presets.......................................................................................................................................84
5.5.1 Save Presets.........................................................................................................................84
5.5.2 Load Presets .........................................................................................................................88
5.6 About..........................................................................................................................................89
5.6.1 Firmware Updates.................................................................................................................90
5.6.2 Modify Network Settings........................................................................................................97
5.6.3 Monitor Page Default Update Rate .......................................................................................98
5.7 Footer Tool Bar..........................................................................................................................98
5.7.1 Help .......................................................................................................................................98
5.7.2 Page Access..........................................................................................................................99
5.7.3 Export..................................................................................................................................100
5.7.4 Import ..................................................................................................................................101
6Performance Specifications...............................................................................................................103
6.1 Power.......................................................................................................................................103
6.2 RF Frequency Error.................................................................................................................103

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6.3 Bit Error Rate...........................................................................................................................103
6.4 Synchronization .......................................................................................................................104
6.5 RF Input...................................................................................................................................106
6.5.1 Additional Band Codes........................................................................................................107
7IF Module...........................................................................................................................................108
8Maintenance Instructions...................................................................................................................113
9Product Warranty...............................................................................................................................114
9.1 Quasonix Limited Warranty Statement....................................................................................114
9.1.1 Extended Warranties...........................................................................................................115
10 Technical Support and RMA Requests..........................................................................................116
11 Appendix A –Recommended AM and AGC Settings for ACU Interfaces ......................................117
11.1 AM and AGC............................................................................................................................117
11.2 AM AGC Compensation ..........................................................................................................117
11.3 Recommended Settings ..........................................................................................................117
12 Appendix B –Phase Noise Compensation....................................................................................119
12.1 Trellis Demodulation Basics ....................................................................................................119
12.1.1 Trellis Demodulation Summary ...........................................................................................120
12.2 Phase Noise Impact.................................................................................................................121
12.3 Clock Jitter Impact ...................................................................................................................121
12.4 When to Use PNC ...................................................................................................................121
12.5 Know Your Transmitter............................................................................................................122
13 Appendix C - PCM Framer/Deframer Function..............................................................................123
13.1 PCM Framer ............................................................................................................................123
13.2 PCM Deframer.........................................................................................................................124
14 Appendix D –Factory Reset Values..............................................................................................125
15 Appendix E –Import Quasonix Root Authority Certificate .............................................................130
15.1 Firefox......................................................................................................................................130

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15.2 Edge, Internet Explorer, and Chrome......................................................................................133
16 Appendix F –Acronym List ............................................................................................................139
List of Figures
Figure 1: Compact RDMS™ Telemetry Receiver-Combiner Part Number Construction.............................2
Figure 2: Mechanical Drawing –Top View (Dual-channel Connectors Shown).........................................10
Figure 3: Dual Channel Compact RDMS Receiver-Combiner (CRC) ........................................................10
Figure 4: 3rd Generation Compact RDMS™ Receiver-Combiner..............................................................11
Figure 5: CRC Front Panel..........................................................................................................................12
Figure 6: Baseband Signal Timing..............................................................................................................15
Figure 7: Custom MDM-25 IP Reset Connector.........................................................................................18
Figure 8: RDMS™ Browser Interface Header Tool Bar ..............................................................................19
Figure 9: Network Screen with Multiple Receivers and Active Channels...................................................20
Figure 10: Network Screen, Closeup of Left Side, Combiners Only...........................................................20
Figure 11: Network Screen, Closeup of Right Side ....................................................................................21
Figure 12: RDMS™ Browser Interface Tool Bar.........................................................................................21
Figure 13: Browser Interface Monitor Screen.............................................................................................22
Figure 14: Monitor Screen for RDMS™ with Only One Channel Available ................................................23
Figure 15: Monitor Screen Partial Status Information Block when Combiner On.......................................23
Figure 16: Monitor Screen Partial Status Information Block when Combiner Off.......................................23
Figure 17: Signal Graph and Signal Indicators Windows ...........................................................................24
Figure 18: Example PCM/FM Eye Pattern..................................................................................................24
Figure 19: Example SOQPSK Constellation...............................................................................................24
Figure 20: Waveform Graphics with Locked SOQPSK Signal....................................................................25
Figure 21: Signal Graph and Signal Indicators Windows, Zero AGC RSSI Display “Relative” ..................26
Figure 22: Power Spectral Density Plot Window ........................................................................................27
Figure 23: Diversity Combiner Link with Locked Signal..............................................................................27
Figure 24: Best Channel Indicator Example ...............................................................................................28
Figure 25: Best Channel Indicator-Combiner..............................................................................................29
Figure 26: Best Channel Indicator-Ch 1......................................................................................................30
Figure 27: Best Channel Indicator-Ch 2......................................................................................................30
Figure 28: Best Channel Data Quality Better than Combiner Data Quality................................................30
Figure 29: Best Channel Indicator Off (Grey) .............................................................................................31
Figure 30: Monitor Display Menu................................................................................................................31

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Figure 31: Monitor Full Display (Default) ....................................................................................................32
Figure 32: Monitor Eye Pattern/Constellation Display Only........................................................................32
Figure 33: Monitor PSD (Spectrum) Only ...................................................................................................33
Figure 34: Monitor Combiner Display Only.................................................................................................33
Figure 35: Monitor Combiner Display Only.................................................................................................34
Figure 36: RDMS™ Browser Interface Header Tool Bar............................................................................34
Figure 37: Configure Screen, Combiner Section........................................................................................34
Figure 38: Configuration Screen with Combiner On, Channel 1 Displays..................................................35
Figure 39: Configuration Screen with Combiner Off, Channel 1 and Channel 2 Display...........................36
Figure 40: Configure Basic Settings Window-PCM/FM Mode....................................................................36
Figure 41: Configure Screen, Messages and Alerts...................................................................................37
Figure 42: Configure Basic Settings Window AQPSK Mode, Two Bit Rates .............................................38
Figure 43: Settings Window, Data Polarity Selection .................................................................................39
Figure 44: DQM Calibration Fixture Process..............................................................................................39
Figure 45: DQE Format...............................................................................................................................40
Figure 46: Configure Basic Settings Window, DQ Encapsulation Checked...............................................41
Figure 47: Settings Window, Derandomizer Drop Down Menu..................................................................41
Figure 48: Configure Basic Settings Window-SOQPSK Mode...................................................................42
Figure 49: Advanced Settings Window.......................................................................................................43
Figure 50: Advanced Settings Window, IF Filter Menu...............................................................................44
Figure 51: Advanced Settings Window, AFC Mode Menu..........................................................................45
Figure 52: Advanced Settings Window, Best Channel Selector Checked..................................................46
Figure 53: System Block Diagram with Best Channel Selector..................................................................47
Figure 54: Advanced Settings Window, Time Aligner Selection Checked .................................................48
Figure 55: Advanced Settings Window, PCM Encoding Drop Down Menu................................................49
Figure 56: Advanced Settings Window, Channel A Video Output Drop Down Menu.................................49
Figure 57: Advanced Settings Window, Channel B Video Output Drop Down Menu.................................50
Figure 58: Advanced Settings Window, Channel A Video Scale................................................................50
Figure 59: Advanced Settings Window, Channel B Video Scale................................................................51
Figure 60: Advanced Settings Window, Tape Output Frequency...............................................................51
Figure 61: Advanced Settings Window, FM De-emphasis .........................................................................51
Figure 62: Forward Error Correction Window when in a PSK Mode ..........................................................52
Figure 63: Forward Error Correction Window, when in SOQPSKLDPC or SOQPSKSTC Mode...............53
Figure 64: Forward Error Correction Window, LDPC Mode Drop Down Menu ..........................................53
Figure 65: Forward Error Correction Window .............................................................................................54
Figure 66: I and Q Data Streams Independently Encoded.........................................................................55
Figure 67: I and Q Data from Single Convolutional Encoder......................................................................55

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Figure 68: Forward Error Correction Window, Convolutional Symbol Enabled (Checked)........................56
Figure 69: Forward Error Correction Window, Reed-Solomon Decoder Enabled (Checked) ....................57
Figure 70: Advanced PCMFM Settings Window.........................................................................................57
Figure 71: Advanced PCMFM Settings Window, Modulation Index Scaling Mode Menu ..........................58
Figure 72: Advanced PCMFM Settings Menu, Modulation Scaling –Track...............................................58
Figure 73: Monitor Screen, Mod Scaling Set to Track................................................................................59
Figure 74: Advanced PCMFM Settings Menu, Modulation Scaling –Hold ................................................59
Figure 75: Monitor Screen, Mod Scaling Set to Hold..................................................................................60
Figure 76: Advanced PCMFM Settings Menu, Modulation Scaling –Off...................................................60
Figure 77: Monitor Screen, Mod Scaling Set to Off ....................................................................................60
Figure 78: Advanced PCMFM Settings Menu, Modulation Scaling –Acquire............................................61
Figure 79: Monitor Screen, Mod Scaling Set to Acquire.............................................................................61
Figure 80: Advanced PCMFM Settings Window, Modulation Persistence Not Checked...........................62
Figure 81: Advanced PCMFM Settings Window, Modulation Scale Index Current Value, Read Only.......63
Figure 82: Mod Index Scaling Mode/Hold, Modulation Scale Index with Edit Field....................................63
Figure 83: Advanced PCMFM Settings Window, Phase Noise Compensation Drop Down Menu.............63
Figure 84: System Settings Window...........................................................................................................64
Figure 85: System Settings, Antenna Controls...........................................................................................65
Figure 86: Antenna Controls Window, HyperTrack Selection.....................................................................66
Figure 87: Antenna Controls Window, AGC Polarity Selection ..................................................................66
Figure 88: Antenna Controls Window, AGC Scale Selection .....................................................................66
Figure 89: Antenna Controls Window, AGC Time Constant Selection.......................................................67
Figure 90: Antenna Controls Window, AGC Freeze Selection ...................................................................67
Figure 91: Antenna Controls Window, AGC Zero Hold Drop Down Menu .................................................68
Figure 92: Antenna Controls Window, AM Polarity Drop Down Menu Selections......................................69
Figure 93: Antenna Controls Window, D/C Antenna Selection Checked ...................................................69
Figure 94: Output Controls Window............................................................................................................70
Figure 95: Output Controls, Clock/Data Output Channel A ........................................................................70
Figure 96: Output Controls, Clock/Data Output Channel B ........................................................................71
Figure 97: System Settings, Test Utilities...................................................................................................72
Figure 98: Test Utilities, Noise Generator-Test Noise Drop Down Menu...................................................72
Figure 99: Test Utilities, Noise Generator-Noise Level Selection...............................................................73
Figure 100: Test Utilities, Data Generator ..................................................................................................73
Figure 101: Data Generator, Test Data Drop Down Menu .........................................................................73
Figure 102: Data Generator, Data Rate Selection......................................................................................74
Figure 103: Data Generator, Pattern Selection...........................................................................................74
Figure 104: Data Generator, Inversion Drop Down Menu ..........................................................................74

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Figure 105: Data Generator, Randomization Drop Down Menu.................................................................75
Figure 106: Test Utilities, BERT..................................................................................................................75
Figure 107: BERT, BERT Measurement Drop Down Menu .......................................................................76
Figure 108: BERT, ReStart BERT Button...................................................................................................76
Figure 109: BERT, Pattern Drop Down Menu.............................................................................................77
Figure 110: BERT, Type Drop Down Menu................................................................................................77
Figure 111: BERT-Time, Bit, and Error Limit Selections ............................................................................77
Figure 112: BERT, Gating Drop Down Menu..............................................................................................78
Figure 113: BERT, Restart on Resync Drop Down Menu ..........................................................................78
Figure 114: Test Utilities, BERT Status ......................................................................................................78
Figure 115: Test Utilities, Status During BER Test.....................................................................................79
Figure 116: Advanced Buttons, Zero AGC Button, Separate Channels or Combiner Active.....................80
Figure 117: Monitor Screen, Signal Strength Grey –AGC Not Zero..........................................................80
Figure 118: Monitor Screen, Signal Strength Not Grey –AGC Zero Value Displayed...............................81
Figure 119: Signal Graph and Signal Indicators Windows, Zero AGC RSSI Display “Relative” ................82
Figure 120: Advanced Buttons, Reset to Factory Defaults Button .............................................................82
Figure 121: Advanced Buttons, Shutdown Hardware Button .....................................................................83
Figure 122: Advanced Buttons, Reboot System Button .............................................................................83
Figure 123: Advanced Buttons, Save Receiver Settings Button.................................................................84
Figure 124: Presets Option on Tool Bar .....................................................................................................84
Figure 125: Presets Screen ........................................................................................................................84
Figure 126: Presets Screen, Closeup of Left Side......................................................................................85
Figure 127: Presets Screen, Closeup of Right Side ...................................................................................85
Figure 128: Preset: View or Modify Preset Screen.....................................................................................86
Figure 129: Preset: View or Modify Preset Screen, Preset Name and Description Fields.........................86
Figure 130: Preset: View or Modify Preset Screen, Information Successfully Saved Message.................87
Figure 131: Saved Presets Screen with New Preset Added ......................................................................88
Figure 132: Preset: View or Modify Preset Screen, Preset Name Set to Default.......................................88
Figure 133: Presets Option on Tool Bar .....................................................................................................89
Figure 134: Presets Screen ........................................................................................................................89
Figure 135: About Option on Tool Bar........................................................................................................89
Figure 136: System Information Screen .....................................................................................................90
Figure 137: System Information Screen, Additional Information ................................................................90
Figure 138: Browser Interface, About .........................................................................................................91
Figure 139: About, System Version, Firmware Update Link.......................................................................91
Figure 140: Firmware Update, Procedure and Notes.................................................................................92
Figure 141: Firmware Update, Upload Status.............................................................................................93

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Figure 142: Firmware Update, File Selected—Ready to Update................................................................94
Figure 143: Firmware Update In Progress, Status......................................................................................94
Figure 144: Firmware Update Complete.....................................................................................................95
Figure 145: About Screen, System Information..........................................................................................96
Figure 146: Firmware Update Failed Information Screen...........................................................................96
Figure 147: System Information Screen, Modify Network Settings Button.................................................97
Figure 148: Network Settings Page ............................................................................................................97
Figure 149: System Information Screen, Monitor Page Default Update Rate Field...................................98
Figure 150: Browser Interface Footer Tool Bar...........................................................................................98
Figure 151: Help Screen.............................................................................................................................99
Figure 152: Page Access Management Screen .........................................................................................99
Figure 153: Page Access Error Message.................................................................................................100
Figure 154: Export Configuration Screen..................................................................................................100
Figure 155: Import Configuration Screen..................................................................................................101
Figure 156: Import Configuration Selection Window ................................................................................102
Figure 157: BER Performance for Tier 0, I, and II ....................................................................................104
Figure 158: Synchronization Time at Various Signal-to-Noise Ratios......................................................105
Figure 159: 70 MHz IF Module in 2” x 3” Chassis.....................................................................................108
Figure 160: 70 MHz IF Module in 2” x 3” Chassis SAW Filter Responses, Narrow Group (10 MHz Span)
..................................................................................................................................................................109
Figure 161: SAW Filter Responses, Wide Group (Plotted on 100 MHz Span).........................................110
Figure 162: Optional SAW Filter Responses for 70 kHz to 6 MHz ...........................................................111
Figure 163: Optional SAW Filter Responses for 14 MHz and 28 MHz.....................................................112
Figure 164: Ideal PCM/FM Phase Tree (h = 0.7)......................................................................................119
Figure 165: Phase Trajectory Never Forgets............................................................................................120
Figure 166: Trellis Detection Gain with Zero to Minimum Phase Noise ...................................................120
Figure 167: Trellis Detection Gain with Significant to Severe Phase Noise .............................................121
Figure 168: "Clean" Eye Pattern...............................................................................................................122
Figure 169: Frame Format with SFIC Insertion Enabled ..........................................................................123
Figure 170: Firefox Options Interface .......................................................................................................130
Figure 171: Firefox Certificate Manager ...................................................................................................131
Figure 172: Firefox Downloading Certificate Window...............................................................................131
Figure 173: Firefox Certificate Viewer-Quasonix Root CA .......................................................................132
Figure 174: Firefox Certificate Manager with Quasonix Root CA Added .................................................133
Figure 175: Internet Properties, Content Tab ...........................................................................................134
Figure 176: Certificates Screen ................................................................................................................135
Figure 177: Windows Certificate Import Wizard........................................................................................135

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Figure 178: Windows Certificate Import Wizard-Browse ..........................................................................136
Figure 179: Windows Certificate Import Wizard-Choose Certificate Store...............................................137
Figure 180: Certificates, Quasonix Certificate Imported...........................................................................138
List of Tables
Table 1: Model Configuration Example.........................................................................................................2
Table 2: Band Configuration Codes..............................................................................................................5
Table 3: Connector Descriptions.................................................................................................................12
Table 4: Front Panel Connector Specifications...........................................................................................13
Table 5: Normal (Default) Video Output Signals.........................................................................................50
Table 6: RDMS BER Specifications..........................................................................................................103
Table 7: Band Configuration Codes..........................................................................................................106
Table 8: Recommended AM/AGC Settings ..............................................................................................117
Table 9: PCM/FM Factory Reset Values ..................................................................................................125
Table 10: SOQPSK Factory Reset Values ...............................................................................................126
Table 11: Multi-h CPM Factory Reset Values...........................................................................................127
Table 12: QPSK Factory Reset Values.....................................................................................................128
Table 13: Multi-h CPM Factory Reset Values...........................................................................................129

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1 Introduction
1.1 Description
This document describes the installation and operation of the Quasonix 3rd Generation Compact RDMS™ Telemetry
Receiver-Combiner and is updated to match RDMS™ System Version 19.3. The RDMS™ (Receiver / DeModulator
/ bit Synchronizer) is designed to downconvert, demodulate, and bit synch to a variety of RF telemetry signals from
flight-test aircraft. With an extensible web-based browser interface, and antenna-tracking outputs, the Compact
RDMS™ Telemetry Receiver-Combiner is capable of fulfilling a variety of flight test station requirements.
The following waveform formats are supported by RDMS™:
•PCM/FM (ARTM Tier 0)
•SOQPSK-TG (ARTM Tier I)
•ARTM CPM / Multi-h CPM (ARTM Tier II)
•Legacy (PSK) suite, which includes:
•BPSK
•QPSK
•Offset QPSK (OQPSK)
•Asymmetric QPSK (AQPSK)
•Unbalanced QPSK (UQPSK)
•Asymmetric Unbalanced QPSK (AUQPSK)
•Digital PM
•STC
•SOQPSK/LDPC
•STC/LDPC
Of the aforementioned, RDMS™ provides true multi-symbol trellis demodulation in all three ARTM modes,
PCM/FM, SOQPSK-TG, and Multi-h PCM. It also provides a clock signal, obviating the need for any outboard bit
synchronizer.
Modes that support LDPC use IRIG-standard low-density parity check coding to dramatically improve link margin
by up to 9 dB.
The Compact RDMS™ Telemetry Receiver-Combiner is manufactured by:
Quasonix, Inc.
6025 Schumacher Park Drive
West Chester, OH 45069
CAGE code: 3CJA9

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1.2 Nomenclature
The Compact RDMS™ Telemetry Receiver-Combiner is available in a plethora of variations based on the number
of frequency bands, demodulation methods, options, etc. The features and modes installed in each unit are identified
in the model number, as depicted in Figure 1.
Figure 1: Compact RDMS™ Telemetry Receiver-Combiner Part Number Construction
Specifications are subject to change. Contact Quasonix for questions regarding your specific receiver.
1.2.1 Options
The available options are listed below. Refer to section 1.2.2 for detailed descriptions of each option. Please contact
Quasonix for assistance ordering receiver options.
•14 14 SAW filter option (adds 70 kHz, 1.4, 3, 6, 14, and 28 MHz filters)
•CS Cybersecurity
•EN Ethernet Payload
•EQ Adaptive Equalizer
•K7 K7 Viterbi Decoder (k=7, rate 1/2)
For example, a model QSX-RDMS-3RCD-Q0-1110-00-EQ is configured as follows:
Table 1: Model Configuration Example
Identifiers
Description
QSX
Quasonix product
R
Receiver / Demodulator / Bit Synchronizer
DMS
Demodulator / Bit Synchronizer
3
Channels
3 - Q
Dual Channel Compact RDMS™ Receiver-Combiner Part Numbering Example
RCD
Frequency
Band
Code
(Refer to
band
table)
-EQ
Options, separated
by hyphens
(example Adaptive
Equalizer)
0 1 1 1 0
PCM/FM
SOQPSK*
Legacy
Mode
1: Yes
0: No
*SOQPSK-TG
*SOQPSK-LDPC
*SOQPSK-STC
ARTM CPM
-00
Pinout
Extended
Tuning:
1: Yes
0: No
Chassis
RCD: Compact Receiver-Combiner
--QSX-RDMS
Standard
Prefix Receiver/
Demodulator/
Synchronizer
Channels
3: 2 RF I/Ps, 3 bbnd O/Ps (incl. combiner)

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Identifiers
Description
RCD
Compact Receiver-Combiner Chassis
Q
Frequency band code
0
No Extended Tuning
1110
Tier 0 present, Tier I present, Tier II present,
Legacy (PSK) absent
00
Pinout code
EQ
Adaptive Equalizer option
1.2.2 Detailed Option Descriptions
1.2.2.1 SAW Filter Option –14
This option adds additional SAW filters, for a total of 14. Additional filters are 70 kHz, and 1.4, 3, 6, 14, and 28
MHz.
1.2.2.2 Cybersecurity –CS, CS1, CS2
These options are used to address customer installation security requirements. The need for these options depends on
the security requirements at the facility where the receivers will be deployed.
Contact Quasonix for additional details or for help with your particular security requirements.
1.2.2.3 Adaptive Equalizer - EQ
The Adaptive Equalizer option in the Quasonix receiver improves reception in multipath channels by using digital
signal processing to compensate for the signal distortion due to multipath. This option is compatible with standard
telemetry applications and installations and it works with any brand of transmitter.
Multipath fading can seriously degrade the quality of wireless telemetry data. Radio transmissions can reflect off of
the airframe or other objects and arrive at the receiving antenna with different time delays, carrier phases, and
relative strengths. The sum of these multiple transmission paths can produce serious distortion and signal fading
resulting in poor data quality and long periods of data outage. Contrary to most situations, increasing the transmit
power will not improve the link quality and may actually make the situation worse. Narrowing the beamwidth of the
antenna may help eliminate some of the reflections and reduce the overall fading and distortion, but constraints on
dish size and antenna tracking performance impose beamwidth limits.
Another solution is to mitigate the effects of the multipath channel by applying a filtering operation at the receiver
that effectively undoes the distortion caused by the channel, thereby ‘equalizing’the received signal. Since the
transmitter is typically moving relative to the receiver, the RF propagation environment dynamically changes over
time requiring the equalizer to ‘adapt’to continually combat the perceived channel distortion. The ‘adaptive
equalizer’automatically calculates and applies a compensating filter to the received signal that restores its ability to
be recovered by a traditional telemetry detector.
The EQ option is currently available for use with all modes except STC modes.
1.2.2.4 Viterbi Decoder (for Legacy PSK Only) - K7
The K7 option (k=7, rate 1/2) enables Viterbi decoding of a convolutionally encoded data stream, which converts it
back to the original (uncoded) source data stream.

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Quasonix, Inc.
Convolutional encoding is a form of legacy forward error correction. Like LDPC, it adds redundant information at
the transmitting end of a telemetry link and then uses that redundancy to detect and correct errors at the receiving
end of the link. Use of convolutional encoding requires a matching Viterbi decoder in the receiver to extract the
source data. The decoded data rate is half the encoded data rate. The receiver has two independent decoders, one for
in-phase (“I”) data and one for quadrature (“Q”) data. For BPSK, only a single decoder is used. Each decoder is
compatible with the convolutional encoding described in the “Consultative Committee for Space Data Systems,
Recommendation for Space Data System Standards, TM Synchronization and Channel Coding, CCSDS 131.0-B-2,
Section 3.”
Viterbi decoding is used to decode constraint-length (K) 7, rate I 1/2, G2-inverted convolutional-encoded data.
The purpose and benefits of convolutional encoding are similar to LDPC. However, convolutional encoding requires
more bandwidth than all but the lowest-rate LDPC codes, and its error-correcting performance is inferior to LDPC.
Therefore, LDPC is the preferred forward error correction if possible.
The Viterbi Decoder control requires the K7 option, and the RDMS must be set to one of the following PSK modes:
BPSK, QPSK, AQPSK, AUQPSK, OQPSK, or UQPSK.
Viterbi decoding and Reed-Solomon decoding can be used together or separately.

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Quasonix, Inc.
1.2.3 Band Configurations
Band configuration codes are listed in Table 2. Two additional band codes are described in section 1.2.3.1.
Table 2: Band Configuration Codes
Freq. Code
A
C
E
F
G
H
J
K
L
M
P
Q
R
S
U
W
X
Y
Z
Legend:
Frequency Gap
Standard (Base) Frequency Range
Extended Frequency Range (available by selecting Extended Tuning = 1 in part number)
P Lower L Upper L C
200.0
400.0 1150.0
1415.0
1435.5 1534.5
1585.0 1650.0
1750.0 1850.0
1855.0
4400.0 5150.0
5250.0
S
2185.0
2200.0 2394.5
2500.0
Base Base Base Base Base
Extended
ExtendedExtendedExtended
Extended

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Quasonix, Inc.
1.2.3.1 Additional Band Codes
Two additional band codes are available:
•Band Code 7: 70 MHz standard range, 0.075 MHz-20 MHz, 70 MHz extended range
•Band Code T: 2025.0 MHz to 2110.0 MHz standard range
1.3 Package Contents
The contents of the box include the following:
•Compact RDMS™ Telemetry Receiver-Combiner
•50 ohm terminators, preinstalled on IF output
•MDM-25, IP Reset Default connector
A copy of the Installation and Operation manual is included with the Browser Interface software (Help option).

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Compact RDMSTM Telemetry Receiver-Combiner
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Quasonix, Inc.
2 Specifications
Characteristic
Specification
Receiver Section
Type
Dual-conversion superheterodyne; two channels
Input RF Frequency
Refer to Table 2
Tuning resolution
Tunes in 62.5 kHz increments, to the 70 MHz IF output, after the 70
MHz IF output, receiver tunes in increments of less than 1 Hz
Frequency stability
1 ppm over temperature; 1 ppm per year aging
Reference oscillator
20 MHz
Noise figure
3.5 dB (typical), 5 dB (maximum)
LO phase noise, measured at 70 MHz IF output
-115 dBc/Hz @ 1 MHz offset
Maximum RF input
+20 dBm (+10 dBm for C-band)
Available gain (to 70 MHz IF output)
114 dB
Gain control
128 dB control range; User selectable: AGC or MGC (AGC freeze)
AGC load impedance
1 KOhm
AGC time constant
Adjustable to any value from 0.1 ms to 1000 ms
First IF bandwidth
60 MHz (nominal)
IF rejection
> 90 dB
Image rejection
70 dB
RF input impedance
50 ohms
VSWR
3:1 Max; 2:1 Typical
Second IF Section
IF frequency
70 MHz
IF output level, nominal
(AGC mode)
Channel 1 and 2: 70 and 250 kHz bandwidths: -15 dBm
0.5 –4.5 MHz bandwidths: -10 dBm
6 and 10 MHz bandwidths: -5 dBm
14 –40 MHz bandwidths: -15 dBm
Combiner: -5 dBm
IF output impedance
50 ohms
IF bandwidths
250 kHz, 500 kHz, 1 MHz, 2 MHz, 4.5 MHz, 10 MHz, 20 MHz, 40 MHz. Automatic
selection based on modulation type and data rate, with manual override
Optional: 70 kHz, 1.4 MHz, 3 MHz, 6 MHz, 14 MHz, 28 MHz

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Quasonix, Inc.
Playback Demodulator IF In, Channel 1 and 2 Section
Input Center Frequency
75 kHz –20 MHz, 70 MHz through any selectable SAW filter
Input Level
-30 dBm + 10 dB
Input Impedance
50 ohms, nominal
Demodulator Section
Demodulator type
ARTM Tier 0 (PCM/FM), ARTM Tier I (SOQPSK-TG), ARTM Tier II (Multi-h CPM)
Legacy suite: Analog FM, BPSK, QPSK, Offset QPSK (OQPSK), Asymmetric QPSK
(AQPSK), Unbalanced QPSK (UQPSK), Asymmetric Unbalanced QPSK (AUQPSK),
Digital PM, Space-Time Coding (STC)
Bit Rates
(after LDPC, Viterbi, Reed-Solomon,
and/or PCM encoding, if applicable)
Tier 0: 24 kbps to 23 Mbps in 1 bps steps
Tier I: 100 kbps to 46 Mbps in 1 bps steps
Tier II: 1 Mbps to 46 Mbps in 1 bps steps
STC: 5 Mbps to 22 Mbps in 1 bps steps
Legacy: 25 kbps to 23 Mbps in Analog FM, 25 kbps to 23 Mbps in BPSK, 50 kbps to
46 Mbps in QPSK in 1 bps steps
Synchronization time
(Average, at BER = 1e-5)
Tier 0: 250 bits, Tier I: 385 bits, Tier II: 2,800 bits
Synchronization acquisition threshold
Tier 0: -8.0 dB Eb/N0; RF Input (dBm): -118.0 (1 Mbps), -108.0 (10 Mbps)
Tier I: -6.0 dB Eb/N0; RF Input (dBm): -116.0 (1 Mbps), -106.0 (10 Mbps)
Tier II: -7.0 dB Eb/N0; RF Input (dBm): -117.0 (1 Mbps), -107.0 (10 Mbps)
Synchronization dropout threshold
Tier 0: -10.0 dB Eb/N0; RF Input (dBm): -120.0 (1 Mbps), -110.0 (10 Mbps)
Tier I: -6.0 dB Eb/N0; RF Input (dBm): -116.0 (1 Mbps), -106.0 (10 Mbps)
Tier II: -15.0 dB Eb/N0; RF Input (dBm): -125.0 (1 Mbps), -115.0 (10 Mbps)
Sensitivity (BER = 1e-5)
Tier 0: 8.6 dB Eb/N0; RF Input (dBm): -101.4 (1 Mbps), -91.4 (10 Mbps)
Tier I: 11.2 dB Eb/N0; RF Input (dBm): -98.8 (1 Mbps), -88.8 (10 Mbps)
Tier II: 13.0 dB Eb/N0; RF Input (dBm): -97.0 (1 Mbps), -87.0 (10 Mbps)
Bit Synchronizer Section
Input codes
NRZ-L/M/S, BIФ-L/M/S
Output codes
NRZ-L; or input code unaltered
Data and clock out
TTL or RS-422
Lock detector out
TTL
Derandomizer
Standard IRIG 15-stage polynomial, selectable On/Off