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3

rd

Generation Compact RDMS

TM

Telemetry Receiver

88

Quasonix, Inc.

12 Appendix C

–Recommended AM and AGC Settings for ACU

Interfaces

12.1 AM and AGC

In a typical flight test scenario, Automatic Gain Control (AGC) tracks out slow variations in received signal
strength. Ideally, the net received signal has constant signal strength except for higher-frequency amplitude
modulation (AM) induced by the antenna tracking mechanism. If the antenna system uses conical scan, sinusoidal
AM is induced by physical motion of the antenna feed. If the antenna system uses e-scan, square-wave AM is
induced by switching between antenna elements.

The receiver demodulates the AM on the received signal and provides it to the antenna control unit (ACU). From the
magnitude and phase of this AM signal, the ACU detects and corrects pointing error.

12.2 AM AGC Compensation

In some systems, vehicle rotation or other dynamics can induce additional undesired low-frequency AM. If the
frequency of this undesired AM is close enough to the scan rate, the AGC will not track it out. Worse, inherent lag
in the AGC may result in severe distortion of the desired AM.

AGC Compensation adjusts the AM output to neutralize these effects. This allows the AGC to fully track out
undesired AM at frequencies just below the antenna scan rate. However, the compensation adds a large amount of
delay to the AM output, proportional to the AGC time constant. This delay may make antenna tracking difficult or
impossible. Therefore, AGC Compensation should only be enabled when:

•

The antenna tracking system experiences degradation due to undesired AM at roughly 1/20 to 1/2 the
antenna scan rate

•

The added compensation delay on the AM signal does not cause the antenna tracking loop to become
unstable; this can only be verified on a case-by-case basis

12.3 Recommended Settings

Recommended AM and AGC settings depend on three primary parameters: antenna scan type (conical or e-scan),
antenna scan rate, and whether the system is subject to undesired low-frequency AM (refer to section 12.2). Table
12 describes recommended settings based on these parameters:

Table 12: Recommended AM/AGC Settings

Antenna

Scan Type

Undesired Low

Frequency AM?

AGC Time Constant

(ms, 0.1 to 1000)

AM Bandwidth

(Hz, 5 to 50,000)

AGC

Compensation

Conical scan

No

1000 / ScanRate

5 * ScanRate

OFF

Conical scan

Yes

850 / ScanRate

5 * ScanRate

ON

E-scan

No

1000 / ScanRate

10 * ScanRate

OFF

E-scan

Yes

850 / ScanRate

10 * ScanRate

ON

In Table 12, ScanRate is the antenna scan rate in Hz.

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Содержание 3rd Generation RDMS 2760

Страница 1: ...Copyright Quasonix Inc All Rights Reserved Installation and Operation Manual 3rd Generation Compact RDMSTM Telemetry Receiver Quasonix Inc 6025 Schumacher Park Dr West Chester OH 45069 11 October 2018 Revision 1 2 1 Specifications subject to change without notice All Quasonix products are under U S Department of Commerce jurisdiction not covered by ITAR ...

Страница 2: ...r Legacy PSK Only K7 3 1 2 2 6 Wide Voltage WV 4 1 2 3 Band Configurations 5 1 2 3 1 Additional Band Codes 6 2 Specifications 7 3 Installation Instructions 9 3 1 Mechanical 9 3 2 Thermal 12 3 3 Electrical 12 3 3 1 Pin Assignments for Ethernet Connector 14 4 Operating Instructions 16 4 1 Power on Operation 16 4 2 Stored Parameters 16 4 3 RDMS Serial Control Protocol 18 4 3 1 Tier 0 PCM FM Tier I SO...

Страница 3: ...ut AHO 36 4 3 2 6 2 Analog Low Speed Output ALO 38 4 3 2 6 3 High Speed Digital Output DHO 40 4 3 2 6 4 Low Speed Digital Output DLO 41 4 3 2 7 Low Speed Mixer Control ALM 43 4 3 2 8 Lock Status Command AL 44 4 3 2 9 Bit Rate BR 44 4 3 2 10 Clock Polarity CP 44 4 3 2 11 Downconverting Antenna DA 45 4 3 2 12 Differential Decoding DD 45 4 3 2 13 Digital Output Muting DOM 46 4 3 2 14 Data Polarity DP...

Страница 4: ...et to Factory Defaults RFD 59 4 3 2 31 Power Level PL 59 4 3 2 32 Phase Noise Compensation PNC 61 4 3 2 33 Query Temperature QT 61 4 3 2 34 Signal Degradation Information SDI 61 4 3 2 35 Spectrum Inversion SI 64 4 3 2 36 Show Serial Number SN 64 4 3 2 37 Save Parameters SV 64 4 3 2 38 Sync Detect SYNC 64 4 3 2 39 System Status Tracking SYS 66 4 3 2 40 Time of Day TOD 66 4 3 2 41 Show Options UP 67...

Страница 5: ...hase Noise Compensation 90 13 1 Trellis Demodulation Basics 90 13 1 1 Trellis Demodulation Summary 91 13 2 Phase Noise Impact 92 13 3 Clock Jitter Impact 92 13 4 When to Use PNC 92 13 5 Know Your Transmitter 93 14 Appendix E PCM Framer Deframer Function 94 14 1 PCM Framer 94 14 2 PCM Deframer 95 15 Appendix F Factory Reset Values 96 16 Appendix G Acronym List 101 List of Figures Figure 1 Receiver ...

Страница 6: ...igure 16 Optional 37 Pin Numbers 86 Figure 17 Ideal PCM FM Phase Tree h 0 7 90 Figure 18 Phase Trajectory Never Forgets 91 Figure 19 Trellis Detection Gain with Zero to Minimum Phase Noise 91 Figure 20 Trellis Detection Gain with Significant to Severe Phase Noise 92 Figure 21 Clean Eye Pattern 93 Figure 22 Frame Format with SFIC Insertion Enabled 94 List of Tables Table 1 Model Configuration Examp...

Страница 7: ...3rd Generation Compact RDMSTM Telemetry Receiver vi Quasonix Inc Table 15 Multi h CPM Factory Reset Values 98 Table 16 QPSK Factory Reset Values 99 Table 17 Multi h CPM Factory Reset Values 100 ...

Страница 8: ...QPSK Requires 37 option Asymmetric Unbalanced QPSK AUQPSK Requires 37 option Offset QPSK OQPSK Unbalanced QPSK UQPSK Digital PM STC SOQPSK LDPC STC LDPC The RDMS provides true trellis demodulation in ARTM Tier 0 Tier I and Tier II modes delivering BER performance within 0 2 dB of theory It also provides a clock signal two clock signals in the AQPSK and AUQPSK modes obviating the need for any outbo...

Страница 9: ...del QSX RDMS 1 A15 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 1 Channels A15 15 pin MDM Male TTL Outputs Q Compact RDMS Part Numbering Example A15 Frequency Band Code Refer to band table 1 Channels 1 1 RF input 1 baseband output 2 2 RF I Ps 2 bbnd O ...

Страница 10: ...jects 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 Na...

Страница 11: ...ource 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 Co...

Страница 12: ...nfiguration 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 Extended Extended Exte...

Страница 13: ...Telemetry Receiver 6 Quasonix Inc 1 2 3 1 Additional Band Codes Two additional band codes are available Band Code 7 External IF Input 70 MHz through any SAW filter 0 075 MHz 20 MHz Band Code T 2025 0 MHz to 2110 0 MHz standard range ...

Страница 14: ...aximum 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 time constant Adjustable 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 Second IF Section IF...

Страница 15: ...t 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 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 an...

Страница 16: ...e 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 The Compact RDMS with the EN EVTM option is shown in Figure 3 It includes a male MDM 9 connector for Ethernet Pin assignments are listed in section 3 3 ...

Страница 17: ...3rd Generation Compact RDMSTM Telemetry Receiver 10 Quasonix Inc Figure 2 3rd Generation RDMS in 4 00 x 3 00 x 1 00 Compact Housing ...

Страница 18: ...3rd Generation Compact RDMSTM Telemetry Receiver 11 Quasonix Inc Figure 3 3rd Generation RDMS in 4 00 x 3 00 x 1 00 Compact Housing with EN EVTM Option ...

Страница 19: ...output Note that first generation hardware did not include the IF output The pin numbering for the MDM 15 male connector is shown in Figure 4 Pin assignments for the MDM 15 are shown in Table 3 Refer to Appendix B for optional 37 pin information Figure 4 MDM 15 Pin Numbers Table 3 MDM 15 Pin Assignments Position Signal Description 1 28 VDC Primary 28 VDC power to module 2 Ground Primary power retu...

Страница 20: ...t Open Power On Ground Power Off Reset 12 Clock Return Ground for TTL outputs Clock for RS 422 outputs 13 Data Return Ground for TTL outputs Data for RS 422 outputs 14 Ones Detect LVTTL signal use for sync time testing 15 RS 232 Rx Input RS 232 commands from host controller By default the output data is valid on the falling edge of the clock as shown in Figure 4 The polarity of the output clock ma...

Страница 21: ... comes installed on the port must remain attached The IF input connector is only active if the correct part number is ordered The metal cap on the connector upon delivery is a dust cap only and is NOT interchangeable with the 50 Ohm termination on the IF output Do not remove dust caps unless the connector is being used 3 3 1 Pin Assignments for Ethernet Connector The RDMS with the EN EVTM option i...

Страница 22: ...ection 3 No Connection 4 No Connection 5 Positive leg of a differential pair Receive data on Ethernet network Pin 3 on a standard RJ 45 Rx on Ethernet Tx on MDM 9 6 Negative leg of a differential pair Transmit data on Ethernet network Pin 2 on a standard RJ 45 Tx on Ethernet Rx on MDM 9 7 No Connection 8 No Connection 9 Negative leg of a differential pair Receive data on Ethernet network Pin 6 on ...

Страница 23: ...od parameters are typically stored in binary format That is 1 designates the feature is enabled 0 designates the feature is disabled Table 6 Stored Parameters Parameter Name Description Default Value Bit Rate 24 kbps 46 Mbps depending on mode 1 Mbps Clock Polarity 1 or 0 denoting clock polarity inverted or not respectively 0 inversion OFF Data Polarity 1 or 0 denoting data polarity inverted or not...

Страница 24: ... then PCM FM If not then SOQPSK If not then MHCPM Modulation Index Tracking In PCM FM mode only Allows Trellis demodulator to automatically detect and adjust to Modulation Indices not at ideal 0 7 A Acquire Note If the user cannot guarantee that the transmit source is a new generation digitally synthesized transmitter the receiver should be left in Tracking mode Failure to do so will cause the rec...

Страница 25: ...RDMS initialization displays last This also varies depending on RDMS settings and options Quasonix Inc 6025 Schumacher Park Dr West Chester OH 45069 513 942 1287 www quasonix com CAGE CODE 3CJA9 IRIG 106 Release 07 PCMFM App Rev 1 0 10 166 Dec 3 2015 09 42 16 PCMFM FPGA Rev 0000102E Nov 12 2015 02 34 51 AGC tables loaded RF attenuator calibration loaded IF attenuator calibration loaded Gain calibr...

Страница 26: ... with no parameters request status only Refer to command HA in section 4 3 2 23 for specific help in reading the command sets Refer to section 4 3 2 for additional command set detail and examples This information is also available in the command Help For example PCM FM FR 2200 5 BR 6 000 AGC results in the following Frequency set to 2200 5 MHz Bit Rate set to 6 000 Mbps and status for all AGC para...

Страница 27: ...AHM Analog High Speed Mixer Displays and controls high speed video output mixer settings 37 None AHO Analog High Speed Output Tape Output Displays and controls high speed video output settings 37 None ALM Analog Low Speed Mixer Displays and controls low speed video output mixer settings 37 None ALO Analog Low Speed Output Displays and controls low speed ACU output settings 37 None AL Lock Status C...

Страница 28: ...g Control shut down of clock and data outputs Standard None DP Data Polarity Report or set data polarity inversion state Standard For Asynch PSK legacy modes DP A and DP B must be specified separately DQE Data Quality Encapsulation Displays and controls data quality encapsulation Standard ARTM modes DQM Data Quality Metric Display and control data quality metric settings Standard ARTM modes DR Der...

Страница 29: ...ys measured output clock frequency Standard None PDC PCM Decoding Controls digital decoding such as NRZ L NRZ M and bi phase Standard None PER Parameters Erase Erases the stored parameter set for the current mode Upon power cycle resets current operating parameter set to factory default values Standard None PERA All Parameters Erase Reset all modes to factory default values Standard None PL Input ...

Страница 30: ...spectral inversion Standard None SN Show Serial Number Report the serial number for the unit Standard None SV Save Parameters Saves the current parameters in non volatile memory including frequency modulation bit rate data polarity clock polarity AGC state verbosity level etc Standard None SYS System Status Tracking Displays the system status of the receiver Standard None TOD Time of Day Sets the ...

Страница 31: ...ntenna scan C e Sets AGC compensated AM enable to e where e Enable 0 Disabled 1 Enabled O s Sets antenna control output to s where s Signal source 0 Channel 0 1 Channel 1 C Combiner ACU S T t R r Antenna scan settings T t Sets antenna mode scan type to t where t Scan type C Conical scan E E scan R r Sets antenna mode scan rate to r 10 00 to 50 00 Hz ACU AM p S s B b Antenna control unit AM setting...

Страница 32: ...AM bandwidth 100 0 Hz Manual AGC time constant 100 0 ms AM output polarity AGC output polarity AGC output scale 10 0 dB V AM scale 1 0 ACU AGC 0 Set polarity to Normal ACU AGC 1 Set polarity to Inverted ACU AGC S 42 0 Set AGC output scale to 42 0 dB V Valid range is 1 0 to 50 0 dB V ACU AGC T 222 0 Set manual mode AGC time constant to 222 0 ms Valid range is 0 1 to 1000 0 ms 4 3 2 2 Adaptive Equal...

Страница 33: ... Sets EQ Mu c 0 125 to 0 125 S s Sets EQ input scale to s 0 000 to 16 000 R e Sets auto reset enable to e e Sets adaptive equalizer enable to e where e Enable 0 Disabled 1 Enabled R S s Sets auto reset speed to r where s Speed F Fast S Slow C e Sets power centering enable to e e Sets adaptive equalizer enable to e where e Enable 0 Disabled 1 Enabled C R r Sets power centering rate to r 0 to 65535 ...

Страница 34: ...zer status PCMFM aeq Adaptive equalizer disabled Filter Mu 0 000122 Center power 0 250 Total power 0 250 0 000 dB Error magnitude 0 000244 Added noise 0 000000 EQ Eb N0 auto hold enabled below 10 000 dB Eb N0 EQ DQM auto hold enabled below 1 000e 02 EQ auto hold reference DQM and held AEQ 0 Disable adaptive equalizer AEQ 1 Enable adaptive equalizer AEQ H x Set equalizer hold below Eb N0 to a value...

Страница 35: ...he armed state In the armed state the AFC tracks and compensates any detected offset regardless of the signal Eb N0 In Tracking mode if the Eb N0 hold is enabled the tracking and compensation stop if the signal Eb N0 is below the hold threshold In this case the detected and compensated offset are the same The detected offset is averaged over the specified settling time AFC AS s and then the delta ...

Страница 36: ...utomatic frequency control correction limit Example AFC L 42 123456 Set AFC correction limit to 42 123456 MHz Valid range is 0 000006 to 46 666661 MHz AFC M Sets the automatic frequency control mode Examples AFC M O Set AFC to Off AFC M H Set AFC to Hold AFC M T Set AFC to Track AFC M A Set AFC to Auto AFC T Sets the automatic frequency control power detect threshold Example AF T 0 0000 Set AFC to...

Страница 37: ...on 60 062 dB Bulk attenuator AGC control enabled switched outCMFM agc AGC control enabled AGC control mode RF AGC automatic mode select enabled AGC zero mode Manual AGC zeroed at 60 36 dBm 60 38 dB attenuation AGC auto zero hold threshold 0 000 dB SNR AGC auto raising zero time constant 0 250 seconds AGC auto lowering zero time constant 0 250 seconds AGC loop total attenuation 60 062 dB Bulk atten...

Страница 38: ...old at attenuation t 0 0 to 255 5 dB Examples AGC BA 1 Bulk attenuator AGC control enabled switched in AGC BA V 17 000 Set attenuation value to 17 000 dB Valid range 0 0000 to 511 9375 dB AGC BA D 33 3 Set switch out threshold delta attenuation to 33 3 dB Valid range 255 5 to 0 0 dB AGC BA I x Set switch in threshold at input power to x dBm AGC BA O x Set switch out threshold at input power to x d...

Страница 39: ...nd disables AGC control of the bulk attenuator This also forces AGC Zero to Auto because when playing back recorded signals such as demod playback demod the noise floor changes as the AGC in the original recording holds the signal power steady and allows the noise floor to move The dynamic range of the AGC closely matches the dynamic range of the auto zero Examples AGC M A Automatically select mod...

Страница 40: ...AGC LUT 111 5Display AGC look up table 111 5 attenuation Valid range is 0 0 to 255 5 dB AGC LUT R Rebuild AGC look up table 4 3 2 4 6 Automatic Gain Control Auto Zero AGC AZ The AGC AZ command enables or disables AGC auto zero and sets hold threshold or time constants AGC AZ H t T t H t Sets the AGC DSP auto zero hold threshold to t 30 000 to 100 000 dB SNR TR c Sets the AGC DSP auto zero raising ...

Страница 41: ...AGC Z A Automatically set AGC zero level AGC Z M m Manually set AGC zero level reset on frequency or IF bandwidth change Reset on power cycle AGC Z H Manually set AGC zero level NO reset on frequency or IF bandwidth change Reset on power cycle AGC Z S Manually set AGC zero level NO reset on frequency or IF bandwidth change NO reset on power cycle AGC Z 2 Set AGC output zero to 2 dBm AGC Z R Reset ...

Страница 42: ...low speed analog outputs and four generic clock data paired digital outputs While there are signals that are normally found on these outputs there is also a list of other sources that can be connected A receiver channel is conceptually divided into two basic parts One is the common platform and the other is the demodulator The platform is common to all telemetry modulations schemes The demodulator...

Страница 43: ... E e where c is the channel to set Valid entries are A Channel DAC A B Channel DAC B C Channel DAC C D Channel DAC D s sets the channel source to one of the options below if desired IF0 Physical channel 0 IF input IF1 Physical channel 1 IF input P0I Physical channel 0 downconverted baseband I only P0Q Physical channel 0 downconverted baseband Q only P0T Physical channel 0 tape output source needs ...

Страница 44: ...bled 1 Enabled Example AHO Displays current high speed video output status settings enabled disabled and output frequency high speed video Channel DAC A Source Data path high speed signal 0 Scale 1 0000 Offset 0 0000 Polarity High high speed video Channel DAC B Source Data path high speed signal 1 Scale 1 0000 Offset 0 0000 Polarity High high speed video Channel DAC C Source Physical channel 0 dow...

Страница 45: ...enable or disable Examples AHO M 0 Disabled AHO M 1 Enabled AHO V Shows extended Help for the AHO command 4 3 2 6 2 Analog Low Speed Output ALO The ALO command displays and controls the low speed ACU output settings Parameter values are explained below ALO c s p S s O o E e where c is the channel to set Valid entries are A Channel A AM B Channel B Aux Analog A Out C Channel C AGC D Channel D Aux A...

Страница 46: ... D 1 Sets the channel to Channel D Aux Analog B Out with polarity active low inverted ALO A S 98 6543 Sets the channel to Channel A Demodulated AM with channel scale set to 98 6543 ALO B E 0 Sets the channel to Channel B and disables the channel ALO V Shows extended Help for the AHO command Example ALO Displays current low speed ACU output status settings enabled disabled and output frequency low ...

Страница 47: ...l Output DHO DHO displays and controls high speed digital output settings DHO c s Sets channel c to source s where c Output channel AC Channel A Clock AD Channel A Data BC Channel B Clock BD Channel B Data CC Channel C Clock CD Channel C Data DC Channel D Clock DD Channel D Data TH1 Top Hat 1 TH2 Top Hat 2 s Signal source F0 Fixed 0 F1 Fixed 1 GC Generator Clock GD Generator Data AC Clock A AD Dat...

Страница 48: ...ere c Output channel AC Channel A Clock AD Channel A Data BC Channel B Clock BD Channel B Data CC Channel C Clock CD Channel C Data DC Channel D Clock DD Channel D Data TH1 Top Hat 1 TH2 Top Hat 2 p Output polarity 0 Active high normal 1 Active low inverted 4 3 2 6 4 Low Speed Digital Output DLO DLO displays and controls low speed digital output settings DLO c s Sets channel c to source s where c ...

Страница 49: ...t 16 TH17 Top Hat 17 TH19 Top Hat 19 TH22 Top Hat 22 s Signal source F0 Fixed 0 F1 Fixed 1 UT0 UART Tx 0 UT1 UART Tx 1 DP0 Datapath 0 DP1 Datapath 1 DP2 Datapath 2 DP3 Datapath 3 DP4 Datapath 4 DP5 Datapath 5 DP6 Datapath 6 DP7 Datapath 7 DLO c p Sets channel c polarity to p where c Output channel UTX UART Tx TH3 Top Hat 3 TH4 Top Hat 4 TH6 Top Hat 6 ...

Страница 50: ...ixer parameters f Sets mixer frequency for ALL channels to f 100 0000 to 100 0000 kHz c e Sets channel c mixer enable to e where c Channel to set enable A Channel A AM B Channel B Aux Analog A Out C Channel C AGC D Channel D Aux Analog B Out e Enable 0 Disabled 1 Enabled Examples ALM x Sets mixer frequency for all channels in MHz Valid range is 46 6667 to 46 6667 MHz ALM c x Sets a specific channe...

Страница 51: ... Sync Bit Rate option and on the Browser Interface in the Advanced Settings Sync Bit Rate field BR r M SM r Set bit rate to r 0 0240 to 23 0000 Mb s M Show measured bit rate SM Set bit rate to measured bit rate BR M Show the current measured bit rate BR M Display measured bit rate in Mbps BR SM Set the bit rate to the measured bit rate BR SM Set the bit rate to the measured bit rate in Mbps Exampl...

Страница 52: ...ed C band tunes directly 1 Enabled C band tunes to downconverted P band Examples DA Downconverting antenna is disabled DA 0 Set downconvert antenna state to Off Disabled C band tunes directly DA 1 Set downconvert antenna state to On Enabled C band tunes to downconverted P band Downconverting antenna control only available when using a 5 band downconverter AND P and C bands are enabled 4 3 2 12 Dif...

Страница 53: ... the output muting unlock timeout to t 0 to 46016 ms C e Sets clock output muting on unlock to e where e Enable 0 Disabled 1 Enabled D e Sets data output muting on unlock to e where e Enable 0 Disabled 1 Enabled Example DOM Output muting timeout 1000 Output muting clock enable 0 Output muting data enable 0 4 3 2 14 Data Polarity DP The DP command displays and controls data output polarity DP p Set...

Страница 54: ...sulation block size to b 1 to 16384 M e r Sets data quality encapsulation tracking display enable to e at rate r where e Enable 0 Disabled 1 Enabled r Display rate r 1 to 60000 ms DQE B Sets data quality encapsulation block size Example DQE B 42 Set data quality encapsulation block size to 42 Valid range is 1 to 16384 DQE M Sets data quality encapsulation tracking display Example DQE M 0 Disable d...

Страница 55: ...al DQM parameters DQM LUT p v Shows or sets DQM LUT parameters p DQM LUT index p 0 to 255 v DQM LUT value v 0 0000 to 0 999985 DQM RAW e Sets the DQM Raw metric output enable to e where e Enable 0 Disabled switched out 1 Enabled switched in Example DQM RAW 1 DQM raw enabled 4 3 2 17 Derandomizer State DR The DR command displays and controls derandomizer settings DR e Sets the derandomizer enable t...

Страница 56: ...ect output s Signal source LD Lock detect SD Sync detect PL PCM frame lock PS PCM sub frame valid c p Sets channel c polarity to p where p Output polarity 0 Active high normal 1 Active low inverted M m Sets channel c output mode to m where m Output mode 0 Allows normal output 1 Forces output to 1 active 1 Forces output to 0 inactive Example DSO Lock detect output Lock detect active High normal ope...

Страница 57: ...a value between 32 000 and 31 984 FEC M Sets the FEC mode for all enabled modes Examples FEC M N Set FEC mode to None FEC M V Set FEC mode to Viterbi K 7 Rate 1 2 Examples FEC FEC mode None 4 3 2 20 Force Lock Indication FL The FL command displays and controls lock forcing settings FL l Sets lock state to l where l Lock state 0 Normal operation 1 Forced active 1 Forced inactive Examples FL Lock is...

Страница 58: ...tional details about the FM B x command OR D m sets the NTSC Video deemphasis filter mode to one of three values 0 Off N NTSC P PAL Example FM FM output polarity FM demodulator bandwidth 1 4 MHz FM output scale 1 0 Video de emphasis filter Off 4 3 2 21 1 FM Video Bandwidth Control FM B The FM B x command adjusts the I Q video output bandwidth with PCM FM in mind Setting the FM video bandwidth wide...

Страница 59: ... 0 MHz Examples FR Rx frequency 2200 500000 MHz FR 2200 5 Set modulation to 2200 5 MHz 4 3 2 23 Advanced Help Command HA HA v Displays extended help for each command if available HA s Searches help for s and displays it Help on Help Commands are tiered according to their degree of complexity frequency of use into basic advanced or extended Basic command help can be accessed by H or Detailed help o...

Страница 60: ...er m Vertical bars indicate a choice of parameters AGC M m e AGC command followed by optional M control parameter followed by the m value parameter OR AGC command followed by just the e value parameter Braces and indicate a required value DDT P s p DDT command followed by optional command control parameter P If the P command control parameter is used it is followed by a required s OR p value param...

Страница 61: ...0 14 0 MHz 1 250 kHz 6 3 0 MHz 11 20 0 MHz 2 500 kHz 7 4 5 MHz 12 28 0 MHz 3 1 0 MHz 8 6 0 MHz 13 40 0 MHz 4 1 4 MHz 9 10 0 MHz 14 OPEN IF F x sets the first IF filter to one of the filter index values below 0 12 0 MHz 1 bypassed Examples IF Auto IF filter select enabled First IF filter 0 12 0 MHz Second IF filter 5 2 0 MHz IF F 0 Sets the first IF filter to 12 0 MHz IF 9 Sets the second IF filter...

Страница 62: ...index scale settings MI s M m TH h THE e AD d AS s P e s Sets modulation index scale to s 0 350 to 8 000 this forces the mode to hold at the specified value M m Sets modulation index scale mode to m where m Mode O Off sets scale 1 0 for nominal deviation of 0 70 H Hold A Acquire T Tracking TH h Sets tracking mode hold below Eb N0 of h 20 000 to 30 000 THE e Sets tracking mode hold below Eb N0 enab...

Страница 63: ...value between 0 350 and 8 000 and forces mode to hold at specified value MI O Disable Mod Index Tracking Set to h 0 7 MI A Acquire mode enable MI A D Sets the maximum delta h indicates a change in h defaults to 0 005 MI A S Sets the delta h settling time defaults to 500 ms MI H Hold Mod Index Tracking at current position MI I Sets Trellis Index MI T Tracking mode enable MI T H x Sets the Tracking ...

Страница 64: ... QPSK MO 5 Set modulation to AQPSK MO 6 Set modulation to AUQPSK MO 7 Set modulation to OQPSK MO 8 Set modulation to UQPSK MO 9 Set modulation to Digital PM DPM MO 10 Set modulation to Analog FM MO 11 Set modulation to Space Time Coding STC MO 12 Set modulation to SOQPSK LDPC MO 13 Set modulation to STC LDPC 4 3 2 28 Output Clock Measurement OCM The Output Clock Measurement command displays measur...

Страница 65: ...at controls the operation of the receiver brick and the other is the stored parameter set The current operating parameters are volatile in nature in that when the power is removed the parameters are lost The stored parameters are saved in FLASH memory in the receiver brick When the receiver brick is turned on the stored parameters are loaded into the current operating parameter set Parameters in t...

Страница 66: ...et to the defaults This does not affect the stored parameter set Example PRS Initializing parameter data ok 4 3 2 30 5 Parameters Save PSV The Parameters Save command writes the current operating parameter set into a previously erased stored parameter set Example PSV Saving parameter data ok 4 3 2 30 6 Reset to Factory Defaults RFD The Reset to Factory Defaults command erases the stored parameter ...

Страница 67: ... leveling target to p 32 15 to 16 01 dBm M t Sets power level measurement to t where t Type T Total power S Signal power F e Sets power filtering to e where e Enable 0 Disabled 1 Enabled Examples PL Input dBm Atten dB Signal dBm Adj dBm Eb N0 dB Saturation 60 48 59 750 3 43 13 03 27 30 0 Power leveling automatic Power leveling active Power level target power 13 00 dB Power level scale 0 00 dB Powe...

Страница 68: ...otal Power PL M 1 Set the power level measurement type to Signal Power PL S Sets the power level scale value Example PL S 2 517 Set the power level scale value to 2 517 Valid range is 0 000 to 7 996 4 3 2 32 Phase Noise Compensation PNC The PNC command reports or sets the phase noise compensation state Examples PNC Phase noise compensation off PNC 0 Set phase noise compensation to Off PNC 1 Set ph...

Страница 69: ...where s Data source P0 Physical input 0 P1 Physical input 1 CMB Combiner P p Sets source polarity to p where p Polarity 0 Active high normal 1 Active low inverted L l Sets lock state to l where l Lock state 0 Normal operation 1 Forced active 1 Forced inactive I t Sets internal threshold to t 0 to 65535 or A for automatic E t Sets external threshold to t 0 to 65535 or A for automatic Examples SDI S...

Страница 70: ...ld to automatic SDI I 4242 Set SDI internal threshold to 4242 Valid range 0 to 65535 SDI L Sets signal degradation information lock state Examples SDI L 0 Set SDI lock state to normal operation SDI L 1 Set SDI lock state to forced active SDI L 1 Set SDI lock state to forced inactive SDI P Sets signal degradation information source polarity Examples SDI P 0 Set SDI source polarity to active high no...

Страница 71: ...d 4 3 2 36 Show Serial Number SN The SN command displays the part number and serial number for the connected RDMS Example SN Part Number QSX RDMS 3R1D A1 1311 00 14 K7 EQ Customer Model CHANNEL 1 Serial Number 2091 Hardware Rev 4 3 2 37 Save Parameters SV The Save Parameters command erases the stored parameter set and writes the current operating parameter set into the stored parameter set in a si...

Страница 72: ...racking display SYNC P n p Sets sync detect pattern to PN sequence n or fixed pattern p where n is PN sequence PN6 PN9 PN11 PN15 PN17 PN20 PN23 PN31 or a fixed pattern p with a length of 2 to 32 bits fixed pattern lengths are automatically determined leading 0s significant Examples SYNC P PN6 Set sync detect pattern to PN6 SYNC P 5 Set sync detect pattern to fixed 5 bit Valid range is 2 to 32 bits...

Страница 73: ...f status lines between header output where e Enable 0 Disabled 1 Enabled r Display rate r 100 to 60000 ms Examples SYS System status display tracking disabled Input dBm Eb N0 dB AFC kHz BR Mb s L Avg DQM TED Q mu Avg TRL MI 108 18 45 15 0 178 0 998965 2 044e 01 0 000979 1 914 1 614 SYS 5 Sets status output period to 5 milliseconds SYS 5 100 Sets status header output once every 100 status updates 4...

Страница 74: ...3R1D A1 1311 00 14 K7 EQ Customer Model CHANNEL 1 Serial Number 2091 Hardware Rev Revisions options None Configured as receiver with IF SAW filters 1 channel Housing is rack mount IF input TTL output Enabled extended bands P band 200 0 to 1150 0 MHz CT band 1150 0 to 2500 0 MHz C band 4400 0 to 5250 0 MHz 70 MHz band 70 0 to 70 0 MHz Playback band 0 1 to 20 0 MHz Enabled modes PSK MHCPM SOQPSK STC...

Страница 75: ...5 19 19 51 AEQ Rev 1 0 5 Sep 9 2015 19 13 52 4 3 2 43 Viterbi Forget Factor VFF The Viterbi Forget Factor command reports or sets the Viterbi forget factor on a scale from 0 01 0 99 VFF F f F f Sets trellis forget factor to f 0 000 to 1 000 Examples VFF Trellis run length 241 078 increment 14 952 Trellis forget factor 0 800 VF 0 04 Set the Viterbi forget factor to 0 04 VF 0 62 Set the Viterbi forg...

Страница 76: ...capable of acquiring a signal with a frequency error of up to 100 kHz 5 3 Bit Error Rate The RDMS meets the following BER limits when tested with a signal source which complies with IRIG 106 17 Table 8 RDMS BER Specifications BER Maximum Eb N0 dB PCM FM Tier 0 SOQPSK TG Tier I Multi h CPM Tier II 10 3 7 5 9 5 11 0 10 4 9 0 11 5 12 5 10 5 10 0 13 0 13 5 10 6 11 0 14 5 14 5 Typical BER performance p...

Страница 77: ... 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 10 1 E 08 1 E 07 1 E 06 1 E 05 1 E 04 1 E 03 1 E 02 1 E 01 1 E 00 2 3 4 5 6 7 8 9 10 11 12 13 14 Eb N0 dB BER Tier 0 QSX DMS 111 Tier I QSX DMS 111 Tier II QSX DMS 111 ...

Страница 78: ...3rd Generation Compact RDMSTM Telemetry Receiver 71 Quasonix Inc Figure 10 Synchronization Time at Various Signal to Noise Ratios ...

Страница 79: ...ed responses of the eight filters are shown in Figure 12 and Figure 13 note the change of horizontal scale between the two figures Six additional filters are available allowing for a total of 14 The optional filters are 70 kHz 1 4 MHz 3 MHz 6 MHz 14 MHz and 28 MHz The measured responses of the optional filters are shown in Figure 14 and Figure 15 Contact Quasonix for information about the optional...

Страница 80: ...3rd Generation Compact RDMSTM Telemetry Receiver 73 Quasonix Inc Figure 12 70 MHz IF Module in 2 x 3 Chassis SAW Filter Responses Narrow Group 10 MHz Span ...

Страница 81: ...3rd Generation Compact RDMSTM Telemetry Receiver 74 Quasonix Inc Figure 13 SAW Filter Responses Wide Group Plotted on 100 MHz Span ...

Страница 82: ...3rd Generation Compact RDMSTM Telemetry Receiver 75 Quasonix Inc Figure 14 Optional SAW Filter Responses for 70 kHz to 6 MHz ...

Страница 83: ...3rd Generation Compact RDMSTM Telemetry Receiver 76 Quasonix Inc Figure 15 Optional SAW Filter Responses for 14 MHz and 28 MHz ...

Страница 84: ...lemetry Receiver 77 Quasonix Inc 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 ...

Страница 85: ...3rd Generation Compact RDMSTM Telemetry Receiver 78 Quasonix Inc 8 Product Warranty The Compact RDMS carries a standard parts and labor warranty of one 1 year from the date of delivery ...

Страница 86: ...rn shipment Authorized return shipments must be addressed in the following manner Quasonix Inc ATTN Repair RMA 6025 Schumacher Park Drive West Chester OH 45069 To ensure that your shipment is processed most efficiently please include the following information with your product return Ship To Company name address zip code and internal mail drop if applicable Attention Contact person Name Title Depa...

Страница 87: ... can be displayed using the BER command with no parameters or a continuous display can be produced using BER D 1 BER D 0 turns off the continuous display Table 9 Bit Error Rate Serial Commands Mnemonic Name Description BER Bit Error Rate Help Provides help for using the bit error rate commands BER Bit Error Rate Status Report bit error rate status Examples BER Measurement disabled Sequence is PN15...

Страница 88: ...t error rate style to Wide with a display rate of 42 Valid range for display rate is 100 to 60000 ms BER D CSV Set bit error rate style to Comma Separated Values BER D R Reset display BER G n Set Bit Error Measurement Gating Sets bit error measurement gating The test can be configured to make a single measurement or when a time limit bit count or error count is set automatically repeat the test BE...

Страница 89: ...R T n Set Bit Error Measurement Type Sets bit error 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 The error count limit guarantees a minimum number of errors BER T t T indicates type where n is one of the following C Sets to Continuous clears limits T x Sets BERT time limit where x is between 0 000 an...

Страница 90: ... BERT is enabled by displaying a pound sign If the BERT is not enabled this column is blank The R column indicates the BERT is actually running and making a measurement by displaying a If the BERT is not running this column is blank 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 t...

Страница 91: ... to noise ratio Therefore input signal levels above 70 dBm are generally recommended Due to the available dynamic range of the demodulator signal processing path and the faithful representation of the AWGN noise samples may be clipped especially at or below 0 dB Eb N0 Note that the noise is injected following downconversion to baseband but before demodulation Therefore the noise will affect demodu...

Страница 92: ... Telemetry Receiver 85 Quasonix Inc Mnemonic Name Description AWGN P p Set Test Noise Level Sets the test noise power level in dB Eb N0 Range for p is 10 00 dB Eb N0 to 50 00 dB Eb N0 Example AWGN P 42 00 AWGN power 42 00 dB Eb N0 ...

Страница 93: ... DAC Ground Analog output GND 5 AM OUT 5V 50 kHz 6 Low Speed DAC A 5V 50 kHz 7 28 VDC Primary 28 VDC power to module 8 Ground Primary power return 2 amps maximum Internally tied to pins 9 12 and 27 9 Ground Primary power return 2 amps maximum Internally tied to pins 8 12 and 27 10 Clock A Out Primary TTL clock output Clock for RS 422 output 11 Data A Out Primary TTL clock output Data for RS 422 ou...

Страница 94: ...27 Ground Primary power return 2 amps maximum Internally tied to pins 8 9 and 12 28 Power on Reset Open Power On Ground Power Off Reset 29 Clock A Return Ground for Primary TTL output Clock for RS 422 output 30 Data A Return Ground for Primary TTL output Data for RS 422 output 31 Ones Detect LVTTL signal use for sync time testing 32 RS 232 Rx Input RS 232 commands from host controller 33 Clock B R...

Страница 95: ...ation adjusts the AM output to neutralize these effects This allows the AGC to fully track out undesired AM at frequencies just below the antenna scan rate However the compensation adds a large amount of delay to the AM output proportional to the AGC time constant This delay may make antenna tracking difficult or impossible Therefore AGC Compensation should only be enabled when The antenna trackin...

Страница 96: ...han recommended Setting the AGC Time Constant higher is unlikely to affect performance though it may degrade performance if vehicle dynamics cause relatively rapid changes in received signal strength The AM Bandwidth may be set lower to reduce noise on the AM signal or higher to reduce delay on the AM signal At the recommended settings AM phase delay is approximately 30 degrees for typical conical...

Страница 97: ... bit below nominal data 0 Makes no use of adjacent symbols for error correction Trellis Detection Uses the phase tree for data detection Uses adjacent symbols to help decide on iffy bits Improves BER performance by 3 5 to 5 0 dB The Phase Tree shown in Figure 17 shows all of the possible paths the phase trajectory can take over a period of seven bits Figure 18 shows the two unique paths based on w...

Страница 98: ...ke better decisions about each individual bit This process improves BER performance by about 3 5 to 5 dB over conventional FM detection However this assumes that the transmitter is really following the known and correct phase tree and this assumption is NOT always true High phase noise can reduce the trellis detection gain because phase noise corrupts the tree The following figures illustrate the ...

Страница 99: ...s in clock rate or have clock stability issues especially under harsh vibration conditions While the RDMS is capable of tracking static clock rate errors as large as 1000 ppM excessive jitter causes the integrated bit sync to lose lock Enabling the PNC mode opens the tracking loop bandwidth to accommodate for these issues This increase in bandwidth does have a tradeoff A wider tracking range allow...

Страница 100: ...ese tips can help determine when to use PNC If your transmitter was manufactured by these companies PNC should be OFF Quasonix guaranteed Nova Engineering highly likely L3 probably but digital transmitters only If the transmitter was manufactured by the companies below PNC should be ON Microwave Innovations Emhiser Southern California Microwave L3 analog transmitters ...

Страница 101: ...eceiver Analyzers can generate PCM frames using external user data or internal test patterns for the frame payload Within the Receiver Analyzer this functionality is referred to as the PCM Framer This note describes the detailed capabilities of the PCM Framer and Deframer 14 1 PCM Framer The PCM Framer supports fixed length PCM frame generation with the following parameters Major frame length up t...

Страница 102: ... early or late that the sync pattern may appear relative to other detected sync patterns and still be detected CORR_THRESH Number of bits of the sync pattern that must match to declare sync detect LOCK_THRESH Number of valid sync detects required to declare PCM frame lock SEARCH_THRESH Number of invalid sync detects required to declare loss of PCM frame lock once locked The PCM Deframer acquires f...

Страница 103: ...3 PCM FM Factory Reset Values Parameter Reset State Parameter Reset State Bit Rate 1 Phase Noise Compensation Off Combiner if available Off Muting Timeout 1000 Clock Polarity Normal Output Muting Off Data Polarity Normal Downconvert Antenna Disabled Equalizer if available Off AGC Polarity Positive DQ Encapsulation if available Disabled AGC Scale 10 Derandomizer Disabled AGC Time Constant 100 Diffe...

Страница 104: ...Scaling N A Clock Polarity Normal Data Polarity Normal Derandomizer Disabled Differential Decoder Enabled IF Filter Auto Downconvert Antenna Disabled AGC Zero Mode Manual Convolutional Decoder N A Lock Output Polarity Active High NRZ Encoding N A Output Control Default Output Muting Disabled Phase Noise Compensation Disabled Tape Output Disabled ...

Страница 105: ...tion Scaling N A Clock Polarity Normal Data Polarity Normal Derandomizer Disabled Differential Decoder N A IF Filter Auto Downconvert Antenna Disabled AGC Zero Mode Manual Convolutional Decoder N A Lock Output Polarity Active High NRZ Encoding N A Output Control Default Output Muting Disabled Phase Noise Compensation Disabled Tape Output Disabled ...

Страница 106: ...aling N A Clock Polarity Normal Data Polarity Normal Derandomizer Disabled Differential Decoder N A IF Filter Auto Downconvert Antenna Disabled AGC Zero Mode Manual Convolutional Decoder Disabled Lock Output Polarity Active High NRZ Encoding NRZ L Output Control Default Output Muting Disabled Phase Noise Compensation Disabled Tape Output Disabled ...

Страница 107: ...odulation Scaling N A Clock Polarity Normal Data Polarity Normal Derandomizer Disabled Differential Decoder N A IF Filter Auto Downconvert Antenna Disabled AGC Enabled Convolutional Decoder N A Lock Output Polarity Active High NRZ Encoding N A Output Control Default Output Muting Disabled Phase Noise Compensation Disabled Tape Output Disabled ...

Страница 108: ...S Consultative Committee for Space Data Systems coding standard CD Compact Disk CPM Continuous Phase Modulation DB 9 D subminiature 9 pin Serial Connector DC Diversity Combiner DHCP Dynamic Host Configuration Protocol DPM Digital Phase Modulation DQE Data Quality Encapsulation DQM Data Quality Metric FPGA Field Programmable Gate Array IF Intermediate Frequency IP Internet Protocol kbps Kilobits pe...

Страница 109: ...ncy RJ 45 Ethernet Connection Jack RM Rack Mount RRC Remote RDMS Client RS 232 Recommended Standard 232 Serial Communications SAW Surface Acoustic Wave SDI System Degradation Indication SOQPSK Shaped Offset Quadrature Phase Shift Keying SOQPSK TG Shaped Offset Quadrature Phase Shift Keying Telemetry Group STC Space Time Coding TRL Tracking Loop TTL Transistor Transistor Logic UDP User Datagram Pro...

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