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Rack-Mount RDMS

TM

 Telemetry Receiver 

 

162

 

 Quasonix, Inc. 

 

10  Appendix B 

– AGC Compensation 

10.1  AM Menu 

Automatic Gain Control (AGC) Compensation adjusts the AM output to neutralize residual low-frequency 
amplitude variation due to inherent lag in the AGC. This process provides excellent decoupling between the AGC 
tracking action and the AM output.  However, it adds delay to the AM output, so AGC Compensation may not be 
suitable for all antenna control applications. 

10.1.1  Recommended Settings 

Recommended AM and AGC settings depend on three primary parameters: ACU scan type (conical or e-scan), 
ACU scan rate, and ACU control loop bandwidth. Table 15 describes recommended settings based on these 
parameters: 

 

Table 15: Recommended AM/AGC Settings 

 

AGC Time Constant 

AM Bandwidth 

AGC 

Compensation 

Conical scan, slow loop 

0.875 / ScanRate 

3 * ScanRate 

ON 

Conical scan, fast loop 

3 / ScanRate 

3 * ScanRate 

OFF 

E-scan 

0.875 / ScanRate 

9 * ScanRate (1) 

ON 

(1) up to a maximum of 50 kHz 

In Table 15, ScanRate is the antenna scan rate. It is most convenient if the calculations are performed using a scan 
rate measured in kHz, so the resulting AGC Time Constant is in units of ms and the resulting AM Bandwidth is in 
units of kHz. 

For example, suppose a conical scan system with slow loop tracking has a scan rate of 30 Hz (0.030 kHz). This 
system has a recommended AGC Time Constant of 0.875 / 0.030 = 29 ms and an AM Bandwidth of 3 * 0.030 = 
0.09 kHz, with AGC Compensation ON. 

The distinction between “slow loop” and “fast loop” is generally not simple to infer. An empirical approach would 
be to assume slow loop, gaining the benefits of AGC Compensation if possible. The fast loop settings would be used 
if the slow loop settings do not provide stable antenna tracking. 

10.2  SNR Estimator (Advanced Menu) 

SNR estimation is used primarily to achieve proper channel weighting by the optimal ratio diversity pre-detection 
combiner. There are two algorithms available to estimate SNR: AGC and DSP. Under normal conditions, with 
proper AGC zeroing, these two algorithms provide substantially similar results. 

The AGC-based SNR estimator measures received power relative to the AGC zero point (i.e., noise floor). This 
estimation is insensitive to modulation and does not distinguish between intended signal and interfering signal. This 
selection is recommended for unknown signals or for signals with modulation that is not constant-envelope (for 
example, unshaped PSK). However, an accurate AGC zeroing process is required for accurate results. 

The DSP-based SNR estimator numerically measures received power relative to noise power at the demodulator 
input, assuming the signal power is attributable to constant-envelope modulation and the noise power is attributable 
to additive white Gaussian noise. This selection is recommended for ARTM modulation types (Tier 0, I, and II) or 
when an accurate AGC zeroing process is not feasible. 

Содержание QSX-RDMS-RM Series

Страница 1: ...ix Inc Copyright Quasonix Inc All Rights Reserved Installation and Operation Manual Rack Mount RDMSTM Telemetry Receiver Quasonix Inc 6025 Schumacher Park Dr West Chester OH 45069 19 July 2018 Revisio...

Страница 2: ...Only K7 4 1 2 3 5 Forward Error Correction Low Density Parity Check LDPC SOQPSK Only LD 4 1 2 3 6 No Display ND 4 1 2 3 7 RS 422 RS 4 1 2 3 8 Clone Channel 2 X2 4 1 2 3 9 Extended C Band XC 5 1 2 3 1...

Страница 3: ...Setting Mode 23 4 1 4 3 Setting Bit Rate 24 4 1 4 4 Diversity Combiner Optional 25 4 1 4 5 Frequency Diversity Available with Diversity Combiner 26 4 1 4 6 Setting Data Polarity 27 4 1 4 7 Setting Cl...

Страница 4: ...s 52 4 1 5 8 5 Set Group Security ID 53 4 1 5 8 6 Set Rack Alias 54 4 1 5 9 LCD Backlight Option 55 4 1 5 10 Advanced Menu 56 4 1 5 10 1 Synchronize Measured Bit Rate 57 4 1 5 10 2 IF Filter 58 4 1 5...

Страница 5: ...s 104 4 2 5 1 1 Ethernet Settings 105 4 2 5 1 2 Status 105 4 2 5 1 3 Alias Name 105 4 2 5 1 4 Additional Information 106 4 2 5 2 Arrange Windows 106 4 2 5 2 1 Restore Default Locations 107 4 2 5 3 Fir...

Страница 6: ...5 2 Graphics in the Remote Client are not Rendering Correctly on a PC using Windows 7 148 5 Performance Specifications 151 5 1 RF Input 151 5 2 Power 151 5 3 RF Frequency Error 151 5 4 Bit Error Rate...

Страница 7: ...ortable 19 Rack Installation with Four RDMS Units Shown 10 Figure 6 Rear Panel 11 Figure 7 HD15 D Sub Pin Locations 13 Figure 8 Baseband Signal Timing 14 Figure 9 Front Panel Diagram for Dual Channel...

Страница 8: ...ulation Scaling Off 30 Figure 40 Green Eye Pattern Display Off 30 Figure 41 Main Menu Modulation Scaling Acquire 31 Figure 42 Yellow Eye Pattern Display Acquire 31 Figure 43 Main Menu Modulation Persi...

Страница 9: ...Loaded Message 45 Figure 75 Options Menu USB Error Message 45 Figure 76 Options Menu Save a USB Preset Selection 45 Figure 77 Save a USB Preset Entry Screen 46 Figure 78 File Exists Error Screen 46 F...

Страница 10: ...Video Filter Setting Entry Screen 63 Figure 113 Advanced Menu Video Scale Selection 64 Figure 114 Video Scale Entry Screen 64 Figure 115 Advanced Menu Video Invert Selection 65 Figure 116 Advanced Me...

Страница 11: ...ation Scaling Menu 84 Figure 151 Modulation Scaling Set to Tracking Signal Graph Displays Red 84 Figure 152 Modulation Scaling Set to Locked Signal Graph Displays Green 85 Figure 153 Modulation Scalin...

Страница 12: ...s Window 105 Figure 187 Network Settings Alias Name Window 106 Figure 188 Network Settings Additional Information Window 106 Figure 189 Tools Menu Arrange Windows Option 107 Figure 190 Tools Menu Firm...

Страница 13: ...e 121 Figure 221 Remote RDMS Client Main Menu Bar About Menu 121 Figure 222 About Screen 122 Figure 223 File Menu 122 Figure 224 Save Load Preset Files 123 Figure 225 Save Load Preset Files Save Prese...

Страница 14: ...indow 173 List of Tables Table 1 Standard Band Field Codes 2 Table 2 Model Configuration Example 3 Table 3 Extended Band Frequency Ranges 5 Table 4 Rear Panel Connector Specifications 11 Table 5 Chann...

Страница 15: ...Rack Mount RDMSTM Telemetry Receiver xiv Quasonix Inc...

Страница 16: ...K 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...

Страница 17: ...F S and C Dual band 2200 5 MHz and 4400 0 MHz 2394 5 MHz and 5150 0 MHz 2200 5 MHz M Lower L Upper L and S Tri band 1435 5 MHz 2394 5 MHz 1435 5 MHz R P Full L and S Quad band 400 0 MHz 2394 5 MHz 143...

Страница 18: ...D LDPC decoder ND Blank front panel with no displays or keypad RS RS 422 clock and data outputs on 3 lug triax connectors X2 Configure Channel 2 the same as Channel 1 bands and modes XC Extended C ban...

Страница 19: ...nvolutionally encoded data stream which converts it back to the original uncoded source data stream Convolutional encoding adds redundant information to the transmitted data stream to help detect and...

Страница 20: ...frequency limit for Lower L band receivers The standard frequency range for Lower L band is 1435 5 MHz to 1534 5 MHz The extended tuning range is 1415 0 MHz to 1585 0 MHz 1 2 3 12 Extended P Band XP...

Страница 21: ...er L S and C 5 band Lower L Upper L S C and P 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...

Страница 22: ...s Synchronization time Average at BER 1e 5 Tier 0 250 bits Tier I 385 bits Tier II 2 800 bits Synchronization 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...

Страница 23: ...6 overall depth Weight 10 4 lbs dual channel Connectors per RF channel RF In Type N female I Out Q Out Clock Out Data Out IF Out AGC Out AM Out BNC female Status SDI Out DB 15 High Density female Conn...

Страница 24: ...3 1 Mechanical The RM RDMS Telemetry Receiver s enclosure fits in a standard 19 rack occupying just 1U of rack space Mechanical layouts are provided in Figure 4 and Figure 5 Figure 2 Mechanical Drawin...

Страница 25: ...Rack Mount RDMSTM Telemetry Receiver 10 Quasonix Inc Figure 4 Interior 3 D Drawing of Single Channel Receiver Figure 5 Portable 19 Rack Installation with Four RDMS Units Shown...

Страница 26: ...RM RDMS is available in single or dual channel configurations with all pertinent electrical connections found on the rear panel 3 3 1 Rear Panel Connections Rear panel connectors are the same for all...

Страница 27: ...t 75 ohms DC coupled J17 2 CH2 SDI CH2 Lock Detect CH2 Clock and Data B HD15 D Sub J18 2 RF Input 50 ohm unbalanced J19 Combined Clock Out 75 ohms 3 3V TTL J20 Combined Data Out 75 ohms 3 3V TTL J21 C...

Страница 28: ...Sub Pinout J17 Pin Electrical Char Pin Electrical Char Pin Electrical Char 1 CH SDI Out 6 GND 11 N C 2 GND 7 CH2 Clock B 12 N C 3 CH2 Demod Lock 8 GND 13 N C 4 GND 9 CH2 Data B 14 N C 5 CH2 Ones Detec...

Страница 29: ...g CD 1 Go to the Remote RDMS Client Install folder at the root level of the CD 2 Double click on the Setup exe file and the installation will begin Depending on the operating system the user may recei...

Страница 30: ...If an inexpensive broadband router is used instead of a switch or hub to connect the computer and the rack unit check each unit s Ethernet cable connections to be sure that they are not connected to...

Страница 31: ...most common settings and a complete numeric keypad for convenient parameter entry In a single channel configuration waveform graphics are displayed on the left most LCD and receiver settings are on th...

Страница 32: ...al time visual representation of the received signal s constellation or eye pattern in the case for PCM FM An example of a PCM FM eye pattern taken from a spectrum analyzer is shown in Figure 11 Figur...

Страница 33: ...y itself does not provide enough information about the integrity of the received data Therefore the signal quality metric is displayed to the right of the signal strength bar with Q below the graph Si...

Страница 34: ...etween the channels press the Select Unit key on the front panel keypad Figure 15 Select Unit Key The LCD dedicated to receiver settings that is under active control will feature a solid blue header b...

Страница 35: ...lly when processing a command for longer than one second This usually occurs during a Mode change or Ethernet configuration Figure 18 Inactive Main Menu Display with Wait Message 4 1 4 Main Menu Setti...

Страница 36: ...menu options use the arrow keys to scroll up or down The complete list redisplays continuously forward or backward depending on which arrow key is pressed Figure 19 Front Panel Keypad To change a set...

Страница 37: ...e front panel keypad to a Delete the entire number by pressing the left arrow key b Move the cursor to the end of the number by pressing the right arrow key c Begin typing the desired frequency in MHz...

Страница 38: ...P and S ranges above S and C Dual band 2200 5 MHz 2394 5 MHz and 4400 0 MHz 5150 0 MHz Refer to S and C ranges above Lower L Upper L and S Tri band 1435 5 MHz 2394 5 MHz Refer to band ranges above P...

Страница 39: ...SK UQPSK DPM Digital PM SOQPSKLDPC SOQPSK with LDPC Decoder Note Changing modes causes the receiver to reload the FPGA which takes approximately 10 seconds to complete A Busy icon appears in the top r...

Страница 40: ...Mbps press the following key combination Figure 28 Example Keypad Combination for Setting Bit Rate If an out of range bit rate is entered the maximum or minimum possible rate will be set by default F...

Страница 41: ...mimic the navigation path being taken by the user in the first channel Note Whenever the Diversity Combiner is On any changes made to the Frequency option even with Frequency Diversity On enabled cau...

Страница 42: ...ing Clock Polarity The Clock option on the Main Menu is for adjusting the clock polarity The parameter options are Normal and Inverted To change the polarity press the Enter key on the front panel key...

Страница 43: ...eypad to scroll to the Force Break Lock Press the Enter key to continue Figure 34 Main Menu Force Break Lock 4 1 4 10 Modulation Scaling PCM FM Mode Only Modulation Scaling is a method used to retain...

Страница 44: ...ng eye pattern is displayed in red when in Tracking mode If there are two channels and the Combiner is set to On the Modulation Scaling controls for setting the modes are linked In Acquire or Tracking...

Страница 45: ...1 4 11 Modulation Persistence 4 1 4 10 3 Modulation Scaling Off The Mod Scaling Off setting is shown in Figure 39 When Modulation Scaling is set to Locked the graphing eye pattern is displayed in gre...

Страница 46: ...h threshold and settles again the receiver is still locked and the Eb N0 at the settling point is higher than the last settling point the current scaling is updated with the new estimate There is no...

Страница 47: ...The differential decoder can be enabled or disabled through the Main Menu by pressing Enter when the parameter is selected The Enter key acts as a toggle switch Normal SOQPSK operation requires the d...

Страница 48: ...llowing parameters AGC state On Off Polarity Gain 00 Time Constant in ms AGC Zero Hold On Off AGC Zero The user may toggle the AGC state Polarity and AGC Zero Hold values by highlighting the desired p...

Страница 49: ...ighlighted A dialog screen displays prompting the operator to enter a new AGC Gain or Time Constant using the rack s front panel numeric keypad When the new value is entered press the Enter key on the...

Страница 50: ...ained in the following example 1 Connect the receiver to its normal RF signal source such as antenna LNA cabling and splitters 2 Orient the receiving antenna in a direction that is expected to yield t...

Страница 51: ...o Set The AGC output voltage is set to zero volts DC at a time when the receiver input is at its minimum value This process ensures that the AGC output voltage will not cross through zero volts DC und...

Страница 52: ...menu includes the following parameters Bandwidth 00 Time Delay 0 Polarity Scale 0 5 2 5 AGC COMP On Off To change the Bandwidth Time Delay or Scale values select the appropriate option as shown in Fig...

Страница 53: ...he rack s front panel numeric keypad as shown in Figure 58 and Figure 59 When the new value is entered press the Enter key on the keypad The AM Bandwidth can be set from 0 1 to 5 kHz The AM Scale has...

Страница 54: ...and pressing the Enter key on the front panel keypad until the desired value displays Refer to Appendix B for more information about the AGC COMP function Figure 61 AM Menu AGC COMP Highlighted 4 1 5...

Страница 55: ...ons To save rack presets select the appropriate option as shown in Figure 63 then press the Enter key on the front panel Figure 63 Options Menu Save Rack Presets Menu Selection The Save Presets screen...

Страница 56: ...the Save Rack Presets screen to be retrieved To load saved rack presets select the appropriate option as shown in Figure 65 then press the Enter key on the front panel Figure 65 Options Menu Load Menu...

Страница 57: ...shown in Figure 68 When the new value is entered press the Enter key on the keypad Any number may be used to identify rack preset configurations saved onto a USB flash drive memory stick If more than...

Страница 58: ...s the location and the name of the folder on the USB flash drive memory stick In this example it is stored as profile 1 If there is no flash drive memory stick in the USB port on the front panel of th...

Страница 59: ...key on the keypad Figure 73 Load Rack Presets to USB Entry Screen After successfully entering a preset number and pressing the Enter key the Options Menu redisplays with one of two message boxes If t...

Страница 60: ...nu Save a USB Preset Selection Insert a USB flash drive into the port on the front panel of the Rack Mount RDMS A dialog screen displays prompting the operator to enter a number between 0 and 999 usin...

Страница 61: ...rt on the front panel of the Rack Mount RDMS the message in Figure 80 displays Insert the flash drive into the USB port and redo the Save Figure 79 Options Menu USB Saved Message Figure 80 Options Men...

Страница 62: ...ey on the keypad Figure 82 Load a USB Preset Entry Screen After successfully entering a preset number and pressing the Enter key the Options Menu redisplays with one of two message boxes If the preset...

Страница 63: ...ion number e g S3 1 0 027 an error count options for clearing the error count or saving the errors to an external USB flash drive and an option allowing software updates via external flash drive The l...

Страница 64: ...ash drive 4 1 5 7 2 Application Update This option allows application software updates to the RDMS unit without shutting down etc To update application software externally 1 Insert the USB flash drive...

Страница 65: ...t including DHCP status DHCP IP address IP Subnet mask Subnet Default gateway address Gateway Set Group Security ID Set Rack Alias Figure 89 Options Menu Network Menu Selection Note Unlike other optio...

Страница 66: ...se a valid IP address for the unit Figure 91 Network Menu DHCP Setting 4 1 5 8 2 IP Address The IP address for the rack unit will either be assigned to it automatically through the use of DHCP or it m...

Страница 67: ...tted decimal representation just like the unit s IP address The most common subnet mask is 255 255 255 0 which means that the unit s last 8 bit number i e 0 through 255 uniquely identifies it within i...

Страница 68: ...the Network Menu as shown in Figure 95 The Group ID can only be set using this front panel menu Figure 95 Network Menu Set Group Security ID Setting When the Set Group Security ID option is selected a...

Страница 69: ...el4 or XYZProjectRDMS The Set Rack Alias option is located on the Network Menu as shown in Figure 97 The Rack Alias may be set using this front panel menu or via the Remote RDMS Client Network Setting...

Страница 70: ...what the lighting conditions in the area where the rack is being used To change the LCD Backlight value select LCD Backlight then press the Enter key on the front panel Figure 99 Options Menu LCD Bac...

Страница 71: ...The Advanced Menu which is accessed via the Main Menu as shown in Figure 101 provides access to the following options Sync Measured Bit Rate IF Filter Video Filter Video Scale Video Invert Video DeEmp...

Страница 72: ...ked The Sync Measured Bit Rate option is located on the Advanced Menu as shown in Figure 102 This option may be set using this front panel menu or via the Remote RDMS Client Advanced Settings window r...

Страница 73: ...1 5 10 2 IF Filter The receiver s integrated IF filter module shown in Figure 105 includes eight 8 SAW filters ranging in bandwidth from 250 kHz to 40 MHz in approximately one octave steps The standar...

Страница 74: ...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 sh...

Страница 75: ...Rack Mount RDMSTM Telemetry Receiver 60 Quasonix Inc Figure 107 SAW Filter Responses Wide Group Plotted on 100 MHz Span...

Страница 76: ...Rack Mount RDMSTM Telemetry Receiver 61 Quasonix Inc Figure 108 Optional SAW Filter Responses for 70 kHz to 6 MHz...

Страница 77: ...ed In the case of a receiver with diversity combining enabled the two channels must have the same IF filter selected for proper operation Figure 110 Front Panel Advanced Menu and IF Filter Menu 4 1 5...

Страница 78: ...ideo Filter Setting Entry screen is shown in Figure 112 When the new value is entered press the Enter key on the keypad Figure 112 Video Filter Setting Entry Screen 4 1 5 10 4 Video Scale The Video Sc...

Страница 79: ...eypad The Video Scale Entry screen is shown in Figure 114 When the new value is entered press the Enter key on the keypad Figure 114 Video Scale Entry Screen 4 1 5 11 Video Invert In Tier 0 PCM FM the...

Страница 80: ...116 is used to set the Video DeEmphasis value to On or Off This option should be used when a corresponding video pre emphasis filter is used on the video transmit side Figure 116 Advanced Menu Video...

Страница 81: ...t Selection The user may toggle the Tape Output value by pressing the Enter key on the front panel keypad until the desired value displays The tape output signal appears on the I Out Video output for...

Страница 82: ...the Enter key on the keypad Figure 120 Tape Frequency Value Entry Screen 4 1 5 16 Muting The Muting option shown in Figure 121 is used to set the muting value to On or Off When the Muting option is se...

Страница 83: ...used to set a timeout value in milliseconds This setting is used to determine when to mute stop sending data when the Muting option is set to On Figure 122 Advanced Menu Muting Timeout Selection A dia...

Страница 84: ...y set the modulation scale index This enables the receiver to operate at the optimum range of modulation desired by the user When modulation scale index is set via the Mod Scaling Menu Mod Scale Index...

Страница 85: ...acking the modulation index follows the receiver s present estimate of the mod index 4 1 5 18 2 Hold Threshold When Mod Scaling is in Tracking mode the modulation index estimate becomes poorer as the...

Страница 86: ...front panel numeric keypad The Mod Scale Hold Threshold Entry screen is shown in Figure 128 The allowable range is 20 000 to 30 000 When the new value is entered press the Enter key on the keypad Fig...

Страница 87: ...ng option is used to set the non return to zero NRZ value used by the receiver NRZ is a way of encoding binary data on a physical signal The options are NRZ L Non return to zero Level NRZ M Non return...

Страница 88: ...coding Menu Spectrum Selection The user may toggle the Spectrum Inversion value by pressing the Enter key on the front panel keypad until the desired value On or Off displays 4 1 5 19 3 Bi Phase Bi Ph...

Страница 89: ...atic reinversion done by the receiver improperly causes the signal to appear inverted to the demodulator The demodulator has a mechanism to invert the spectrum in the digital domain The downconverting...

Страница 90: ...e for all waveform modes SNR estimation is used primarily to achieve proper channel weighting by the optimal ratio pre detection diversity combiner There are two algorithms available to estimate SNR D...

Страница 91: ...Ethernet settings Figure 136 Advanced Menu Factory Default Selection 4 2 Remote RDMS Client RRC Control RRC provides the user with full configuration control and monitoring capabilities for one or mu...

Страница 92: ...n at the top right and the Basic RDMS Settings window which displays a variety of parameters for each available channel Figure 137 Remote RDMS Client in Desktop Window Whenever there is activity in pr...

Страница 93: ...to three 3 minutes to see that the RDMS unit is missing Selecting the missing RDMS rack from the other instances of the GUI may cause that GUI to wait for an extended period of time trying to connect...

Страница 94: ...igure 141 Selected RDMS Unit and Connect Screen Button The Remote RDMS Client displays a message notifying the requestor that a connection attempt is being made as shown in Figure 142 Figure 142 Conne...

Страница 95: ...MS Settings window can be accessed at any time by navigating to the Main Menu and selecting Remote Control Basic Settings Figure 144 Remote Control Menu 4 2 3 1 Basic Settings The Basic RDMS Settings...

Страница 96: ...cy mode bit rate Filter Settings Screen buttons for initiating or cancelling actions Signal indicators including lock detect signal strength signal quality combiner link status 4 2 3 1 1 1 Channel Sel...

Страница 97: ...en the user clicks on a checkbox to activate the field the parameter is automatically updated The Refresh Settings screen button is used to clear changes without applying saving them The field values...

Страница 98: ...ation Scaling contains four settings Tracking Locked Off and Acquire Modulation Scaling is a method used to retain the maximum trellis coding gain of a non ideal FM signal The Mode and Modulation Scal...

Страница 99: ...84 Quasonix Inc Figure 150 Basic Settings Window Modulation Scaling Menu When Modulation Scaling is set to Tracking the graphs display in red as shown in Figure 151 Figure 151 Modulation Scaling Set t...

Страница 100: ...because the optimal signal monitoring is no longer valid If there are two channels and the Combiner is set to On the Modulation Scaling is NOT linked Modulation Scaling for channel one and channel tw...

Страница 101: ...Modulation Scaling is set to Acquire the state is set to Armed In Armed state modulation scaling operates continuously If the receiver is locked and the delta h the change in modulation index has sett...

Страница 102: ...mitters have an inordinate amount of phase noise reducing the effectiveness of the trellis demodulator In Tier 0 PCM FM enabling the Phase Noise Compensation option box checked relaxes the requirement...

Страница 103: ...dicators for each receiver channel Signal Lock detection Signal Strength Signal Quality Figure 156 Signal Graph and Signal Indicators Windows A signal lock indicator provides a visual representation o...

Страница 104: ...fore it is not uncommon to see a red signal strength bar indicator accompanied with a green signal lock indicator 4 2 3 1 1 6 Diversity Combiner If the optional diversity combiner is installed and ena...

Страница 105: ...is selected then any settings made for channel 1 will be copied to channel 2 but channel 2 settings will not copy to channel 1 The reverse is true if the operator selects the CH1 CH2 option After sele...

Страница 106: ...set to any non PCM FM mode the Advanced Settings tab provides the user with AGC and AM settings for antenna tracking Tape Output Settings Muting Settings Synchronize Bit Rate Settings SNR Estimator s...

Страница 107: ...CM FM Version 4 2 3 1 2 1 On screen Buttons The Advanced Settings tab contains four on screen buttons used to initiate or cancel various actions These buttons shown in Figure 164 are Apply Settings Re...

Страница 108: ...Scaling option allows the operator to manually set the modulation scale index This enables the receiver to operate at the optimum range of modulation desired by the user Modulation Persistence allows...

Страница 109: ...indow AGC Zero is used to set a baseline for background radio noise levels A typical application of the AGC Zero function is explained in the following example 1 Connect the receiver to its normal RF...

Страница 110: ...puts frequency phase information to their default condition which varies by mode Please refer to section 3 3 1 for a complete description of back panel connectors including pinouts Figure 168 Tape Out...

Страница 111: ...sent for the measured bit rate to be valid You may also type a number into the Measured Bit Rate field Allowable value ranges vary depending on the waveform mode in use You must click on the Apply Set...

Страница 112: ...settings On the Basic Settings window Mode Set to PCM FM to enable the FM demodulator Bit rate Set to 3 Mbps IF filter Must be a minimum of 6 MHz the actual filter used will depend on the number of IF...

Страница 113: ...oder also commonly referred to as the Viterbi Decoder is available in PCM FM and legacy PSK modes Its purpose is to decode data that has been encoded per Consultative Committee for Space Data Systems...

Страница 114: ...n to tune to the C to P band downconverted signal by specifying the C band frequency In a receiver that also has actual C band receiver capability an ambiguity develops when a C band frequency is spec...

Страница 115: ...S Performance Monitor as shown in Figure 175 To access the Multiple RDMS Performance Monitor navigate to the Main Menu and then select Remote Monitoring Multiple RDMS Performance Monitor Figure 175 Mu...

Страница 116: ...ghlighted in green and lock status is True to indicate a signal lock Channel 2 is highlighted in red and lock status is False to indicate there is no signal lock Figure 177 Multiple RDMS Performance M...

Страница 117: ...n calculating the All Devices Signal Lock Indicator To show hidden channels click on the Show Inactive Test Channels screen button Figure 179 Multiple RDMS Performance Monitor Inactive Channels Hidden...

Страница 118: ...DMS Performance Monitor Two RDMS Receivers in Rack Figure 181 Multiple RDMS Performance Monitor Four RDMS Receivers in Rack 4 2 5 Tools Menu The Tools menu shown in Figure 182 provides three options N...

Страница 119: ...ols menu Tools Network Settings shown in Figure 183 Figure 183 Tools Menu Network Settings Option All Ethernet settings for the rack mount receiver that is currently selected are found on the Network...

Страница 120: ...displays messages that occur as a result of the operator applying network settings Figure 186 Network Settings Status Window 4 2 5 1 3 Alias Name The Network Settings Alias Name window shown in Figur...

Страница 121: ...rmation The Network Settings Additional Information window shown in Figure 188 provides a listing of the UDP ports used for pass through data and graphics Figure 188 Network Settings Additional Inform...

Страница 122: ...s any dialog window size and locations to factory defaults 4 2 5 3 Firmware Upgrade The Firmware Upgrade option shown in Figure 190 is accessed via the Tools menu Tools Firmware Upgrade Figure 190 Too...

Страница 123: ...ame assigned to the rack Assigned Indicates whether or not the Client IP is connected to the Rack IP Client racks are displayed in the order in which they are opened with the last opened client displa...

Страница 124: ...of Mission Control Client Window The following examples describe the steps that may be used to connect and control an RDMS rack Using the Selected RDMS Unit dropdown list Client 1 selects a rack name...

Страница 125: ...on Yes to ask for rack control and receives a Request Sent message as shown in Figure 198 Figure 198 Request Sent Message After the request for control is sent the Mission Management tab on Client 2...

Страница 126: ...eceiver 111 Quasonix Inc Figure 199 Tool Bar Flashes Another Client Wants Control of Rack Figure 200 Close Up of Flashing Mission Management Tool Bar An example of another Client 2 s Mission Control W...

Страница 127: ...ient 2 s Messages Window Prior to Denying Control In Scenario A Client 2 HCD L2 denies the request by clicking on the Deny screen button Client 2 has the option of sending a chat message using the tex...

Страница 128: ...e text box at the bottom of the Messages window This message could be a simple Releasing rack in 5 minutes or a message such as How long do you need the rack Figure 205 Example Client 2 s Messages Win...

Страница 129: ...put is the person with the password a mission operator supervisor team leader security officer etc some designated person A Client Master has the ability to take control of any rack without the permi...

Страница 130: ...ss Code Box Immediately Client HCD L2 s RDMS client window is closed without warning and HCD L2 becomes the new client master as evidenced by the True in the Client Master field next to HCD L2 s name...

Страница 131: ...tandard operating procedure 4 2 6 2 Group Security Filter RDMS racks may be configured two different ways depending on the preferred structure A Group Identifier ID is used to provide a unique name fo...

Страница 132: ...rack units however any description may be used 4 2 6 2 2 1 Additional Filter Settings The Allow Public Racks checkbox is used to turn On or Off visibility of racks that do not have a Group ID assigned...

Страница 133: ...utton This button loads a saved Group ID list Click on the Load Table File button A Windows Explorer Open screen displays as shown in Figure 217 allowing the user to select a saved XML file Scroll to...

Страница 134: ...on erases only a selected entry row in the table Use this option to clear any row that is no longer needed Save Changes Screen Button This option saves the table entry Use this option to save all chan...

Страница 135: ...Figure 219 Group Security Filter Ethernet Group ID Filter Screen Filtered by Department In Figure 219 the racks from two departments Development and Lab are visible on the Windows RDMS client RDMS rac...

Страница 136: ...on than a departmental configuration In this example only three individual RDMS units B4BTAS1 B4BTAS4 B4BTAS6 are visible to the Windows RDMS client 4 2 7 About Menu The About menu shown in Figure 221...

Страница 137: ...ance 1 notation near the top of the screen indicates this is open RDMS Client 1 More than one instance of the Client software may be open at once 4 2 8 File Menu The File menu provides a variety of op...

Страница 138: ...e a description in the Preset Description window On screen buttons are used to add folders delete or rename existing files or to Save or Load Presets Clicking on the Cancel screen button closes the wi...

Страница 139: ...Folder Name Window Type a name for the new folder as shown in Figure 227 along with the desired description Click on the Apply screen button to add the folder or click on the Cancel screen button in t...

Страница 140: ...utton the Rename window opens within the window as shown in Figure 229 Use the scroll bar to select the file to rename The selected file name displays in the Rename field and the associated file descr...

Страница 141: ...ash Preset options allow the user to save and load settings stored on the RDMS rack Figure 230 File Tab Save Load Preset Files 4 2 8 2 1 RDMS Save Profile Menu When the user selects the Save RDMS Flas...

Страница 142: ...rofile menus on the rack at a later time Click on the Save screen button to save a selected preset or Cancel to exit the Save Profile Menu without taking any action 4 2 8 2 2 RDMS Load Profile Menu Wh...

Страница 143: ...4 2 8 3 Turn Off RDMS Unit Accessed from the File menu the Turn Off RDMS Unit option as shown in Figure 233 allows the user to cut power to the RDMS and turn it Off While on the File menu click on the...

Страница 144: ...RDMSTM Client The serial control interface is not recommended for typical Rack Mount Receiver usage The Advanced Terminal Settings should only be accessed by advanced users Contact Quasonix customer s...

Страница 145: ...s 4 3 1 Advanced Terminal Window The Advanced Terminal window shown in Figure 238 amounts to a portal to the currently selected receiver s serial control interface This allows the user to communicate...

Страница 146: ...able to detect when serial commands are given at which time the green Refresh Settings screen button begin to flash in order to prompt the user Figure 239 Advanced Terminal Window with User Message Al...

Страница 147: ...ommands Standard Basic None AD Downconvert Antenna AD Report the downconvert antenna state AD 0 Set downconvert antenna state to Off Disabled AD 1 Set downconvert antenna state to On Enabled Downconve...

Страница 148: ...value of the input attenuator Valid range is 0 to 124 dB Examples AV Report the input attenuator setting AV 0 Set input attenuator to 0 dB AV 124 Set input attenuator to 124 dB Standard Basic None BE...

Страница 149: ...state CP 0 Set clock inversion Off CP 1 Set clock inversion On Standard Basic For Asynch PSK legacy modes CP A and CP B must be specified separately DE Differential Decoder Enable Report or set diffe...

Страница 150: ...o scale multiplier Examples DO IQ M 2 5 Scale I and Q video output by 2 5 times normal Standard Advanced None DP Data Polarity Report or set data polarity inversion state Examples DP Display the curre...

Страница 151: ...quency error tracking limit Examples EL F 5 Set frequency error limit to 2 5 times the bit rate Standard Expert ARTM PCM FM SOQPSK TG MULTI H CPM EL T Error Limits TED Sets timing bit rate error track...

Страница 152: ...s required when setting both the modulation and the bit rate Standard Basic None HX eXtended Help Displays a full list of available commands Standard Basic None LD LDPC Decode Enable Enable disable or...

Страница 153: ...dex Report or Set Modulation Index Tracking or Acquire Examples MI Report Mod Index Track Status MI O Disable Mod Index Tracking Set to h 0 7 MI A Acquire mode enable MI A D Sets the maximum delta h i...

Страница 154: ...ation to 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 Standard Basic Limited to modes...

Страница 155: ...d Configuration Resets all parameters in all waveform modes to the factory default state Refer to Appendix D for default values by mode Standard Basic None PL Input Power Level Reports or sets the cur...

Страница 156: ...ter coefficient Valid range is 1 to 16 Example PL F 5 Set the power level filter coefficient to 5 Standard Advanced Command None PL M Power Level Measurement Type Sets the power level measurement type...

Страница 157: ...mpensation Report or set phase noise compensation state Examples PN Report the phase noise compensation state PN 0 Set phase noise compensation to Off PN 1 Set phase noise compensation to On Standard...

Страница 158: ...stem status of the receiver The first argument specifies the period in milliseconds between status updates Zero 0 disables continuous monitoring The second argument specifies the number of status line...

Страница 159: ...M FM TO T Tape Output Source Sets the test output to a Tape source Enables or Disables the pre detection complex baseband as the tape output source When enabled T 1 pre detection complex baseband is s...

Страница 160: ...factor VF 0 04 Set the Viterbi forget factor to 0 04 VF 0 62 Set the Viterbi forget factor to 0 62 Standard Advanced Command PCM FM VL Verbosity Level Report or set verbosity level on a scale of 0 9...

Страница 161: ...for the local user If the local user presses a key the settings LCD on the receiver s front panel will display the following message Remote Client Active Press SEL UNIT to override If the local user...

Страница 162: ...Control Panel screen displays click on the Network and Sharing Center selection Figure 241 In some versions of the Windows operating system there is an additional folder layer such as Control Panel Al...

Страница 163: ...Graphics in the Remote Client are not Rendering Correctly on a PC using Windows 7 This issue may be caused by a Windows 7 operating system using the Windows XP graphics scaling setting To change the...

Страница 164: ...ure 243 Control Panel Display Selection 3 The Display window contains an options menu Click on Set custom text size DPI as shown in Figure 244 Figure 244 Display Window Set Custom Text Size Option A C...

Страница 165: ...scaling to remove the option By default the scale setting is 100 You can use large fonts above 100 but the setting for Windows XP scaling MUST be unchecked 5 Click on the OK button to save the setting...

Страница 166: ...0 MHz and 2200 5 MHz 1150 0 MHz and 2394 5 MHz 2200 5 MHz F S and C Dual band 2200 5 MHz and 4400 0 MHz 2394 5 MHz and 5150 0 MHz 2200 5 MHz M Lower L Upper L and S Tri band 1435 5 MHz 2394 5 MHz 1435...

Страница 167: ...or to that tabulated above Figure 246 BER Performance for Tier 0 I and II 5 5 Synchronization The RDMS offers very fast reliable acquisition even at very low signal to noise ratio Synchronization time...

Страница 168: ...Rack Mount RDMSTM Telemetry Receiver 153 Quasonix Inc Figure 247 Synchronization Time at Various Signal to Noise Ratios...

Страница 169: ...Rack Mount RDMSTM Telemetry Receiver 154 Quasonix Inc 6 Maintenance Instructions The Rack Mount Receiver requires no regular maintenance and there are no user serviceable parts inside...

Страница 170: ...Rack Mount RDMSTM Telemetry Receiver 155 Quasonix Inc 7 Product Warranty The Rack Mount Receiver carries a standard parts and labor warranty of one 1 year from the date of delivery...

Страница 171: ...pment 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...

Страница 172: ...ommands BE c Bit Error Rate Status Report bit error rate status c is optional and indicates channel 0 or 1 If channel is omitted the current tracking channel TC is used If TC is 2 a channel number is...

Страница 173: ...itted the current tracking channel TC is used If TC is 2 a channel number is required T indicates type where n is one of the following C continuous clears limits T x time limit where x is between 0 an...

Страница 174: ...register status c is optional and indicates channel 0 or 1 If channel is omitted the current tracking channel TC is used If TC is 2 a channel number is required Example BE 1 R Report bit register stat...

Страница 175: ...7 9 1 Test Noise Commands Digitally generated additive white Gaussian noise AWGN can be injected in the demodulator for test purposes This noise can exhaust most or all of the demodulator s error free...

Страница 176: ...king channel TC is used If TC is 2 a channel number is required Examples TN Show the test noise status TN 1 Show the status of channel 1 TN c E n Enable Disable Test Noise Turns the test noise output...

Страница 177: ...Time Constant of 0 875 0 030 29 ms and an AM Bandwidth of 3 0 030 0 09 kHz with AGC Compensation ON The distinction between slow loop and fast loop is generally not simple to infer An empirical approa...

Страница 178: ...ow 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 performa...

Страница 179: ...er 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...

Страница 180: ...lock 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 int...

Страница 181: ...ps 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...

Страница 182: ...eset values for each mode are listed in the following tables Table 16 QPSK Factory Reset Values Parameter Reset State Bit Rate 1 Modulation Scaling N A Clock Polarity Normal Data Polarity Normal Deran...

Страница 183: ...g Tracking Clock Polarity Normal Data Polarity Normal Derandomizer Disabled Differential Decoder N A IF Filter Auto Downconvert Antenna Disabled AGC Enabled Convolutional Decoder Disabled Lock Output...

Страница 184: ...aling N A Clock Polarity Normal Data Polarity Normal Derandomizer Disabled Differential Decoder Enabled IF Filter Auto Downconvert Antenna Disabled AGC Enabled Convolutional Decoder N A Lock Output Po...

Страница 185: ...on 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 P...

Страница 186: ...MS Client being unable to connect to the PC Any separator other than a period is unrecognizable by the RDMS software Some regions use a comma instead of a period to separate the fractional part of dec...

Страница 187: ...he Region and Language selection labeled 2 in Figure 254 This causes the Region and Language window to display labeled 3 in Figure 254 Figure 254 Region and Language Selection 3 In the Region and Lang...

Страница 188: ...ow 4 Use the down arrow in the List Separator column to change the comma to a period Click on the OK button to complete the change and close the window 5 Click on the OK button in the Region and Langu...

Страница 189: ...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 FPGA Field Programmable Gat...

Страница 190: ...ient RS 232 Recommended Standard 232 Serial Communications SAW Sawtooth Wave SDI System Degradation Indication SNR Signal to Noise Ratio SOQPSK Shaped Offset Quadrature Phase Shift Keying SOQPSK TG Sh...

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