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Quasonix Compact RDMS Installation And Operation Manual

Telemetry receiver
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ISO 9001:2008
Certified
 
Installation and Operation Manual
TM
Compact RDMS
Telemetry Receiver
Quasonix, Inc.
6025 Schumacher Park Dr.
West Chester, OH 45069
06 November 2014
Revision 2.1.2
No part of the document may be circulated, quoted, or reproduced for distribution without prior written approval from
Quasonix, Inc.
Copyright Quasonix, Inc., All Rights Reserved.

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  • Page 1 Quasonix, Inc. 6025 Schumacher Park Dr. West Chester, OH 45069 06 November 2014 Revision 2.1.2 No part of the document may be circulated, quoted, or reproduced for distribution without prior written approval from Quasonix, Inc. Copyright Quasonix, Inc., All Rights Reserved.

  • Page 2: Table Of Contents

      Compact RDMS Telemetry Receiver   Table of Contents Introduction ............................1 Description........................... 1 Nomenclature ..........................1 1.2.1 Options ............................ 2 1.2.2 Detailed Option Descriptions....................2 1.2.3 Band Configurations ........................ 5 Specifications............................2 Installation Instructions .......................... 4 Mechanical........................... 4 Thermal............................1 Electrical ............................
  • Page 3   Compact RDMS Telemetry Receiver   13.5 Know Your Transmitter ......................44 Appendix E – Factory Reset Values ....................45 Appendix F – Acronym List ......................49 List of Figures Figure 1: Receiver Types and Options ......................1 Figure 2: RDMS™ in 4.00” x 3.00” x 1.00” Compact Housing..............5 Figure 3: MDM-15 Pin Numbers ........................
  • Page 4   Compact RDMS Telemetry Receiver   Table 10: Optional 37-Pin Assignments...................... 37 Table 11: QPSK Factory Reset Values....................... 45 Table 12: PCM/FM Factory Reset Values ....................46 Table 13: SOQPSK Factory Reset Values ....................47 Table 14: Multi-h CPM Factory Reset Values..................... 48...

  • Page 5: Introduction

      1 Introduction 1.1 Description This document describes the installation and operation of the Quasonix Compact RDMS™ Telemetry Receiver. The RDMS™ (Receiver / DeModulator / bit Synchronizer) is designed to demodulate RF signals in several formats:  PCM/FM (ARTM Tier 0) ...

  • Page 6: Options

      Compact RDMS Telemetry Receiver   1.2.1 Options The available options include:  14 SAW filter option (Adds 70 kHz, 1.4, 3, 6, 14, and 28 MHz filters)  Eight-way clock and data multiplexer (requires 37-pin connector)  Double rate SOQPSK-TG (46 Mbps) ...
  • Page 7 1.2.2.5 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.
  • Page 8   Compact RDMS Telemetry Receiver   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...

  • Page 9: Band Configurations

      Compact RDMS Telemetry Receiver   1.2.3 Band Configurations Band configuration codes are listed in Error! Reference source not found.. Two additional band codes are described in section 1.2.3.1. Table 2: Band Configuration Codes 1415.0 Extended 1585.0 1650.0 Extended 1855.0 2185.0...
  • Page 10   Compact RDMS Telemetry Receiver   1.2.3.1 Additional Band Codes Two additional band codes are available:  Band Code 7: 70 MHz standard range, 0.5 MHz-20 MHz, 70 MHz extended range  Band Code T: 2025.0 MHz to 2110.0 MHz standard range...

  • Page 11: Specifications

      Compact RDMS Telemetry Receiver   2 Specifications Characteristic Specification Receiver Section Type Dual-conversion superheterodyne Input RF Frequency Refer to Table 2 Tunes in 62.5 kHz increments, to the 70 MHz IF output, after the 70 Tuning resolution MHz IF output, receiver tunes in increments of less than 1 Hz...
  • Page 12   Compact RDMS Telemetry Receiver   Demodulator Section ARTM Tier 0 (PCM/FM), ARTM Tier I (SOQPSK-TG), ARTM Tier II (Multi- h CPM) Demodulator type Legacy suite: Analog FM, BPSK, QPSK, Offset QPSK (OQPSK), Asymmetric QPSK (AQPSK), Unbalanced QPSK (UQPSK), Asymmetric...

  • Page 13: Installation Instructions

    Telemetry Receiver   3 Installation Instructions 3.1 Mechanical The Compact RDMS™ is designed to be mounted by eight (8) 6-32 screws through the holes along the front and back edges, as depicted in Figure 2 on the following page. Quasonix, Inc.

  • Page 14: Figure 2: Rdms™ In 4.00" X 3.00" X 1.00" Compact Housing

      Compact RDMS Telemetry Receiver   Figure 2: RDMS™ in 4.00” x 3.00” x 1.00” Compact Housing Quasonix, Inc.

  • Page 15: Thermal

      Compact RDMS Telemetry Receiver   3.2 Thermal It is important that the RDMS™ be kept within its specified operating range of -40°C to +70°C. At maximum bit rates, the unit dissipates approximately 20 watts. At normal ambient room temperatures, a small fan blowing across the top cover is adequate.

  • Page 16: Figure 4: Baseband Signal Timing

      Compact RDMS Telemetry Receiver   Position Signal Description RS 232 Tx Output RS-232 responses to host controller +28 VDC Primary 28 VDC power to module Ground Secondary power return, 2 amps maximum; Internally tied to pins 2, 3, and 6 Power ON Power on reset pin;...
  • Page 17   Compact RDMS Telemetry Receiver   The 70 MHz IF output on the second SMA connector, labeled “IF OUT”, is provided for troubleshooting purposes. The IF is resistively coupled from the input of the demodulator. Therefore, the signal level on the IF output should be within 2 dB of the demodulator’s input.

  • Page 18: Operating Instructions

    The following parameters are stored in the unit’s nonvolatile flash memory. The descriptions and default values are listed in Table 5. As with the Quasonix part number ordering method, parameters are typically stored in binary format. That is, “1” designates the feature is enabled, “0” designates the feature is disabled.

  • Page 19: Rdms Serial Control Protocol

    If the user knows for sure that the transmit source is digitally synthesized, the tracking should be set to Off, for the minimum acquisition time. 4.3 RDMS Serial Control Protocol The Compact RDMS™ is controlled via a simple three-wire serial interface (transmit, receive, and ground). Configure your controller’s serial port to the following settings: ...

  • Page 20: Figure 5: Rdms™ Welcome Message

    Telemetry Receiver   For setup and configuration via a standard Windows-based PC, Quasonix recommends the application called Terminal, a flexible, full-featured control interface that is included in the RDMS Product CD. Otherwise, one can use HyperTerminal, included with the standard Windows installation (Start -> All Programs -> Accessories ->...

  • Page 21: Tier 0 (Pcm/Fm), Tier I (Soqpsk-Tg), And Tier Ii (Multi-H Cpm) Commands

      Compact RDMS Telemetry Receiver   4.3.1 Tier 0 (PCM/FM), Tier I (SOQPSK-TG), and Tier II (Multi-h CPM) Commands The following table describes all receiver user commands. Listed are the command code, name, description of the command, whether specific options must be ordered or the command is standard on all receivers, basic or advanced command, and whether the command is restricted to specific waveform modes.
  • Page 22   Compact RDMS Telemetry Receiver   Mnemonic Name Description Option (s) Basic or Mode Required Advanced Restriction Command Manual Report or set the value of the Standard Basic None Attenuator input attenuator Control Valid range is 0 to 124 dB...
  • Page 23   Compact RDMS Telemetry Receiver   Mnemonic Name Description Option (s) Basic or Mode Required Advanced Restriction Command Clock Polarity Report or set clock polarity Standard Basic For Asynch inversion state (legacy) Examples: modes, CP Report the clock A and CP...
  • Page 24   Compact RDMS Telemetry Receiver   Mnemonic Name Description Option (s) Basic or Mode Required Advanced Restriction Command Frequency Report or set receiver center Standard Basic None frequency Examples: Report the frequency setting FR 2200.5 Set modulation to 2200.5 MHz...
  • Page 25   Compact RDMS Telemetry Receiver   Mnemonic Name Description Option (s) Basic or Mode Required Advanced Restriction Command LDPC Decode Enable, disable, or show the Advanced Enable current state of the Forward Command (legacy) Error Correction (FEC) / Low Select...
  • Page 26   Compact RDMS Telemetry Receiver   Mnemonic Name Description Option (s) Basic or Mode Required Advanced Restriction Command Modulation Report or Set Modulation Standard Basic PCM/FM Index Index Tracking or Acquire Examples Report Mod Index Track Status MI O Disable Mod Index Tracking (Set to h=0.7)
  • Page 27   Compact RDMS Telemetry Receiver   Mnemonic Name Description Option (s) Basic or Mode Required Advanced Restriction Command Modulation Report or set modulation Standard Basic Limited to setting modes installed Examples: Report the modulation setting MO 0 Set modulation to...
  • Page 28   Compact RDMS Telemetry Receiver   Mnemonic Name Description Option (s) Basic or Mode Required Advanced Restriction Command Output Report or set the channel 8F and -37 Basic None Control source values Examples: Show current OC settings OC D Set the default...
  • Page 29   Compact RDMS Telemetry Receiver   Mnemonic Name Description Option (s) Basic or Mode Required Advanced Restriction Command Input Power Reports or sets the current Standard Advanced None Level input power level setting Command Examples: Report the current input power level information...
  • Page 30   Compact RDMS Telemetry Receiver   Mnemonic Name Description Option (s) Basic or Mode Required Advanced Restriction Command Derandomizer Report or set the Standard Basic None State derandomizer state Examples: Report the derandomizer state RN 0 Set the derandomizer RN 1 Set the derandomizer...
  • Page 31   Compact RDMS Telemetry Receiver   Mnemonic Name Description Option (s) Basic or Mode Required Advanced Restriction Command System Status Displays the system status Standard Advanced Available Tracking of the receiver Command for all EXCEPT The first argument specifies the period, in milliseconds, (legacy) between status updates.
  • Page 32   Compact RDMS Telemetry Receiver   Mnemonic Name Description Option (s) Basic or Mode Required Advanced Restriction Command TO F Tape Output Sets the carrier frequency of Advanced PCM/FM Frequency the pre-detection complex Command Tape Output Examples: TO F 0 Sets the Tape...
  • Page 33 *Note regarding VF command: The VF command sets the observation window for the Viterbi decoder in the trellis demod. The longer the window, the more coding gain. The smaller the window, the more resistant to phase noise. Quasonix recommends NOT manually changing this value. The Phase Noise Compensation mode automatically adjusts this as needed.

  • Page 34: Performance Specifications

      5 Performance Specifications 5.1 DC Input The Compact RDMS™ operates from a nominal 28 VDC, +/- 4 VDC with a current consumption of no more than 25 Watts. 5.2 RF Frequency Error By default, the Compact RDMS™ is capable of acquiring a signal with a frequency error of up to ±100 kHz.

  • Page 35: Synchronization

    Figure 6: BER Performance for Tier 0, I, and II 5.4 Synchronization The Compact RDMS™ offers very fast, reliable acquisition, even at very low signal to noise ratio. Synchronization time is a function of modulation type and IF frequency error. Typical SOQPSK results (from 10,000 synchronization trials) are shown in Figure 7.

  • Page 36: Figure 7: Synchronization Time At Various Signal-To-Noise Ratios

      Compact RDMS Telemetry Receiver   Figure 7: Synchronization Time at Various Signal-to-Noise Ratios Quasonix, Inc.

  • Page 37: Rf Input

    Telemetry Receiver   5.4.1 RF Input The Compact RDMS™ is available in frequency bands shown in Table 8. Two additional band codes are described in section 5.4.1.1. The input impedance is 50 ohms. Table 8: Band Configuration Codes 1415.0 Extended 1585.0...
  • Page 38   Compact RDMS Telemetry Receiver   5.4.1.1 Additional Band Codes Two additional band codes are available:  Band Code 7: 70 MHz standard range, 0.5 MHz-20 MHz, 70 MHz extended range  Band Code T: 2025.0 MHz to 2110.0 MHz standard range...

  • Page 39: If Module

    MHz, 14 MHz, and 28 MHz. The measured responses of the optional filters are shown in Figure 11 and Figure 12. Contact Quasonix for information about the optional filters. Based on the receiver’s high level of integration, the proper IF filter is automatically selected based on the current mode and bit rate settings of the demodulator.

  • Page 40: Figure 9: 70 Mhz If Module In 2" X 3" Chassis Saw Filter Responses, Narrow Group (10 Mhz Span)

      Compact RDMS Telemetry Receiver   Figure 9: 70 MHz IF Module in 2” x 3” Chassis SAW Filter Responses, Narrow Group (10 MHz Span) Quasonix, Inc.

  • Page 41: Figure 10: Saw Filter Responses, Wide Group (Plotted On 100 Mhz Span)

      Compact RDMS Telemetry Receiver   Figure 10: SAW Filter Responses, Wide Group (Plotted on 100 MHz Span) Quasonix, Inc.

  • Page 42: Figure 11: Optional Saw Filter Responses For 70 Khz To 6 Mhz

      Compact RDMS Telemetry Receiver   Figure 11: Optional SAW Filter Responses for 70 kHz to 6 MHz Quasonix, Inc.

  • Page 43: Figure 12: Optional Saw Filter Responses For 14 Mhz And 28 Mhz

      Compact RDMS Telemetry Receiver   Figure 12: Optional SAW Filter Responses for 14 MHz and 28 MHz Quasonix, Inc.

  • Page 44: Maintenance Instructions

      Compact RDMS Telemetry Receiver   7 Maintenance Instructions The Compact RDMS™ requires no regular maintenance, and there are no user-serviceable parts inside. Please consult the factory for any maintenance, upgrade, or repair requirements. Quasonix, Inc.

  • Page 45: Product Warranty

      Compact RDMS Telemetry Receiver   8 Product Warranty The Compact RDMS™ carries a standard parts and labor warranty of one (1) year from the date of delivery. Quasonix, Inc.

  • Page 46: Technical Support And Rma Requests

      9 Technical Support and RMA Requests In the event of a product issue, customers should contact Quasonix via phone (1-513-942-1287) or e-mail (support@quasonix.com) to seek technical support. If Quasonix determines that the product issue must be addressed at the factory, a returned materials authorization (RMA) number will be provided for return shipment.

  • Page 47: Appendix A - Bit Error Rate Testing

      Compact RDMS Telemetry Receiver   10 Appendix A – Bit Error Rate Testing There is a separate BERT for each data path in the receiver (0 main channel, 1 combiner channel). By default all commands are targeted to the current “tracking channel” (TC command), 0 or 1. If the tracking channel is set to 2 (tracking both channels), then the channel must be explicitly specified.
  • Page 48   Compact RDMS Telemetry Receiver   Mnemonic Name Description BE [c] T n Set Bit Error Sets bit error measurement type Measurement Type The test type can be configured to run continuously or stop when either a time limit, bit count, or error count has been reached.
  • Page 49   Compact RDMS Telemetry Receiver   Mnemonic Name Description BE [c] M Measurement Enable Starts or stops bit error measurement (toggle command) If a time limit, bit count, or error count limit is set and the limit has been reached (enabled but not running) the BERT is restarted.
  • Page 50   Compact RDMS Telemetry Receiver   The BERT can be enabled, but not running, in the case of a time, bit, or error count limit. An asterisk '*' after the error rate column indicates that the data is inverted. If the display is continuous and a time, bit, or error limit is set with repeating gating, the display shows the end of the test by displaying '>>>' in the first...

  • Page 51: Appendix B - Pinouts For Optional 37 Pin Connector

      Compact RDMS Telemetry Receiver   11 Appendix B – Pinouts for Optional 37 Pin Connector The optional 37-pin connector provides three sets of clock and data, two high-speed analog outputs, and one low- speed analog output. Pin numbering for the optional connector is shown in Figure 13. Pin assignments are listed in Table 10.
  • Page 52   Compact RDMS Telemetry Receiver   Position Signal Description DAC Ground Analog output (GND) Factory use only – Do Not Connect Data C - Clock and Data pairs Factory use only – Do Not Connect Factory use only – Do Not Connect...

  • Page 53: Appendix C - Detailed Output Control (Oc) Command Settings

      Compact RDMS Telemetry Receiver   12 Appendix C – Detailed Output Control (OC) Command Settings The Output Control command, as described in Table 6, is used to report or set the channel source values. Note: The state settings use the alpha O, not a number zero (0).
  • Page 54   Compact RDMS Telemetry Receiver   Mnemonic Name Description OC c s where c is channel: Set Channel and Source O_0, O_1, O_2, O_3, O_4, O_5, O_6, O_7 where s is source: CLK_I0, DATA_I0, CLK_Q0, DATA_Q0, CLK_I1, DATA_I1, CLK_Q1, DATA_Q1, CLK_T, DATA_T, OFF When the outputs return the value above, this says the outputs are routed to the default settings.

  • Page 55: Appendix D - Phase Noise Compensation

      Compact RDMS Telemetry Receiver   13 Appendix D – Phase Noise Compensation 13.1 Trellis Demodulation Basics Legacy Single-Symbol Detection:  Uses basic Limiter-Discriminator operation  Frequency in this bit above nominal → data = 1  Frequency in this bit below nominal → data = 0 ...

  • Page 56: Trellis Demodulation Summary

      Compact RDMS Telemetry Receiver   Figure 15: Phase Trajectory Never Forgets 13.1.1 Trellis Demodulation Summary The basic premise of trellis demodulation is that the signal from the transmitter follows a known path through the phase tree. When the demodulator knows this, it can use a sequence of several symbols to help make better decisions about each individual bit.

  • Page 57: Phase Noise Impact

      Compact RDMS Telemetry Receiver   Figure 17: Trellis Detection Gain with Significant to Severe Phase Noise 13.2 Phase Noise Impact Trellis demodulation is based on the assumption that the signal is following a predictable path through the trellis. If this is not true (due to high phase noise), then a trellis demodulator cannot provide the expected performance gain.

  • Page 58: Know Your Transmitter

      Compact RDMS Telemetry Receiver   Figure 18: "Clean" Eye Pattern 13.5 Know Your Transmitter If you know the brand and type of transmitter, these tips can help determine when to use PNC. If your transmitter was manufactured by these companies, PNC should be OFF: ...

  • Page 59: Appendix E - Factory Reset Values

      Compact RDMS Telemetry Receiver   14 Appendix E – Factory Reset Values When a reset command is activated, the frequency defaults to the lowest valid frequency for the lowest authorized band on the unit. The reset priority is: 1. QPSK 2.

  • Page 60: Table 12: Pcm/Fm Factory Reset Values

      Compact RDMS Telemetry Receiver   Table 12: PCM/FM Factory Reset Values Parameter Reset State Bit Rate Modulation Scaling Tracking Clock Polarity Normal Data Polarity Normal Derandomizer Disabled Differential Decoder IF Filter Auto Downconvert Antenna Disabled Enabled Convolutional Decoder Disabled...

  • Page 61: Table 13: Soqpsk Factory Reset Values

      Compact RDMS Telemetry Receiver   Table 13: SOQPSK Factory Reset Values Parameter Reset State Bit Rate Modulation Scaling Clock Polarity Normal Data Polarity Normal Derandomizer Disabled Differential Decoder Enabled IF Filter Auto Downconvert Antenna Disabled Enabled Convolutional Decoder Lock Output Polarity...

  • Page 62: Table 14: Multi-H Cpm Factory Reset Values

      Compact RDMS Telemetry Receiver   Table 14: Multi-h CPM Factory Reset Values Parameter Reset State Bit Rate Modulation Scaling Clock Polarity Normal Data Polarity Normal Derandomizer Disabled Differential Decoder IF Filter Auto Downconvert Antenna Disabled Enabled Convolutional Decoder Lock Output Polarity...

  • Page 63: Appendix F - Acronym List

      Compact RDMS Telemetry Receiver   15 Appendix F – Acronym List Acronym Description Automatic Gain Control Amplitude Modulation AQPSK Variant of Quadrature Phase Shift Keying ARTM Advanced Range Telemetry AUQPSK Variant of Quadrature Phase Shift Keying Bit Error Rate...
  • Page 64   Compact RDMS Telemetry Receiver   Acronym Description Phase Shift Keying QPSK Offset Quadrature Phase Shift Keying RDMS Receiver DeModulator Synchronizer Radio Frequency RJ-45 Ethernet Connection Jack Rack Mount Remote RDMS Client RS-232 Recommended Standard 232 (Serial Communications) Surface Acoustic Wave...

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