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Semco RC100C-2, User Manual

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Semco RC100C-2 User Manual Download Page 62

 

A2537-002/01 February 2020                 

                                  6-1   

                                   SEMCO Proprietary Information

 

 

SECTION 6 - DEMODULATOR AND EMBEDDED BIT SYNCHRONIZER OPERATION 

 

6.1 

Overview 

 
The  three  RC100C-2  Demodulators  and  embedded  Bit  Synchronizers  are  FPGA-based  designs  that 
function independently. These demodulators and embedded bit synchronizers are designed to support all 
modulation formats and emerging technologies used at both U.S. and international flight test ranges.  

 

The  Demodulator  and  embedded  Bit  Synchronizer  controls  and  features  include  basic  and 

Advanced

 

Settings

. Table 6-1 lists selectable Demodulator/Bit Synchronizer controls, settings and features. 

 

Table 6-1 

Demodulator Modes and Features 

 

Demodulator Modes 

Standard: PCM/FM, NTSC Video, PM, BPSK, A/U/S/O/QPSK Tier 0 Trellis FM, Tier I SOQPSK-TG, Tier II and Multi-h CPM 
Optional: PM, PM/PSK Sub-carrier, FM/FM Sub-carrier, GMSK, UQPSK/SQPN Spread Spectrum and Coherent AM; 

Demodulator Features 

FIR filters AUTO-SET feature as a function of data rate input (IFBWs and Baseband Video BWs) 
15 selectable IF FIR filters and Baseband FIR filters calculated and presented to the user as a function of data rate 
Embedded Bit Synchronizer and De-Randomizer 
2 Analog, 1 Digital Clock and 1 Digital Data Output per channel 
Video Low Pass Filtering, Video Polarity and De-Emphasis 
AUTO loop bandwidth and acquisition sweep settings optimized for demodulator format and data rate 
User-selectable loop bandwidths, acquisition sweep range and sweep rates with AUTO feature disabled  
Trellis FM Modulation Index Selection 
“Fast Acquire” for fastest acquisition time (Tier 0, I and II), with “Track Loop Bandwidth” for PM/PSK and SOQPSK-TG  
FM Low Data (Sweep) Rate (<10 kbps) feature 
Adaptive Equalization 
Data Quality Metrics (DQM) and Data Quality Encapsulation (DQE) 
SOQPSK Low Density Parity Check (SOQPSK-LDPC) 
SOQPSK Space Time Coding (SOQPSK-STC) 
I/Q Interleaving 
Viterbi and Turbo Forward Error Correction Option 

 

These features are accessible from both the front panel displays and keypad and the remote (network) 
GUI as described in subsequent paragraphs of this section. 

 
6.2 

Demodulation Mode Selection 

 

Demodulation  Mode  selection  using  the  front  panel  displays  and  keypad  is  shown  in  Figure  6-1.  The 
operator pushes the 

DEMOD MODE

 button to access the 

Demod Menu 

display, uses the 

UP

 (2) and 

DOWN

 (8) arrows to scroll to 

Mode

 in blue, and then pushes 

ENTER

 or 

SELECT

 (5) to highlight the 

Mode 

selection window in

 bright magenta

. Using the 

UP

 (2) and 

DOWN

 (8) arrows, the operator selects the 

desired 

<

Ch1

> Demodulation Mode

 and then pushes 

ENTER

 or 

SELECT

 (5). 

 
Using the horizontal 

LEFT

 (4) and 

RIGHT

 (6) arrows, the operator selects 

<

Ch2

>

 in the 

Demod Menu

 

header display bar.  The operator then pushes 

ENTER

 or 

SELECT

 (5) to highlight the 

Mode 

selection 

window  in

  bright  magenta

.  Using  the 

UP

  (2)  and 

DOWN

  (8)  arrows,  the  operator  selects  the  desired 

<

Ch2

> Demodulation Mode

 and then pushes 

ENTER

 or 

SELECT

 (5). Using the horizontal 

LEFT

 (4) and 

RIGHT

 (6) arrows again, the operator selects 

<

Comb

>

 in the 

Demod Menu

 header display bar and repeats 

the process for selecting the Combiner demodulation mode. 

 

Note

: 

All  3  demodulator  channels  will  change  to  the  selected  demodulator  mode  if 

Diversity  Slaving

  has  been  enabled  (see 

SECTION  2

,  paragraph  2.6.1.2,  which 

describes and illustrates how to enable the 

Diversity

 

Slaving

 feature).  

 

Summary of Contents for RC100C-2

Page 1: ...ING THIS INFORMATION EITHER IN WHOLE OR IN PART OR MANUFACTURE PRODUCE SELL OR LEASE ANY PRODUCT COPIED FROM OR ESSENTIALLY REPRODUCED FROM THE INFORMATION CONTAINED IN THIS DOCUMENT WITHOUT THE EXPRESSED WRITTEN APPROVAL OF SYSTEMS ENGINEERING MANAGEMENT COMPANY DISTRIBUTION STATEMENT DISTRIBUTION OF THIS DOCUMENT IS AUTHORIZED TO U S GOVERNMENT AGENCIES THEIR CONTRACTORS AND INTERNATIONAL USERS ...

Page 2: ...safe operation and use of commercial equipment Use standard and accepted safety practices with respect to operating commercial electrical equipment at all times to avoid the risk of personal injury or death EMI EMC The RC100C 2 SEGR complies with all FCC and CE regulations regarding electromagnetic interference and compatibility There are no personnel hazards or safety issues with respect to EMI E...

Page 3: ...A2537 002 01 February 2020 SEMCO Proprietary Information LIST OF EFFECTIVE PAGES Page Change Date Page Change Date All Initial 04 01 2019 All Updates 02 01 2020 ...

Page 4: ...WARE I O 3 1 3 1 Hardware Telemetry I O 3 1 3 1 1 Single Card Receiver SCR Hardware 3 2 3 1 2 Diversity Combiner Hardware 3 2 3 1 3 IF Demodulator Hardware 3 2 3 1 4 Optional Multi Channel Bit Synchronizer Frame Synchronizer BERT and PN Generator 3 3 3 1 5 TM over I P Option 3 3 3 1 6 Additional RC100C 2 Hardware 3 3 SECTION 4 TELEMETRY RF RECEIVER OPERATION 4 1 4 1 RF Frequency Settings 4 1 4 1 1...

Page 5: ...Front Panel Combiner Status Indicators 5 3 5 1 4 Combiner Status Window on Remote GUI 5 3 5 1 5 Combiner Best Source Select BSS 5 4 5 1 6 Combiner Zero Feature 5 5 5 1 7 Combiner AGC Slope and Polarity 5 6 5 1 8 AGC Output Impedance Selection 5 7 5 1 9 AGC Zero 5 7 SECTION 6 DEMODULATOR AND EMBEDDED BIT SYNCHRONIZER OPERATION 6 1 6 1 Overview 6 1 6 2 Demodulator Mode Selection 6 1 6 3 Demodulator ...

Page 6: ... 9 Rx Buffers 8 10 8 5 TM over IP Transmission 8 11 ILLUSTRATIONS FIGURE TITLE PAGE 2 1 RC100C 2 Spectrum Efficient Ground Receiver 2 1 2 2 RC100C 2 Initial Power and Remote Network Connections LAN and TM over IP 2 2 2 3 RC100C 2 SEGR Front Panel LCD Displays and Keypad 2 3 2 4 Remote Network GUI Displays 2 3 2 5 Front Panel Keypad Controls 2 4 2 6 Front Panel Display Screen Settings 2 6 2 7 CH1 R...

Page 7: ...u 4 2 4 5 Remote GUI Frequency Selection 4 3 4 6 Frequency Up Down Increment Selection on Remote GUI 4 3 4 7 Entering a CIF Band Frequency on Remote GUI 4 4 4 8 Absolute RSSI Status Display 4 4 4 9 AGC Zero and Relative RSSI Status Settings 4 5 4 10 Antenna Signal Strength and Correction Factor Settings 4 6 4 11 Absolute and Relative Signal Strength Display on Remote GUI 4 7 4 12 Maximum Average S...

Page 8: ...e Selection Using Front Panel MOD MODE Controls 6 2 6 3 Demod Mode Selection in Individual or Multiple Channels 6 2 6 4 Demodulator Mode Selection on Remote GUI 6 3 6 5 Demodulator Data Rate Selection Using Front Panel Displays and Keypad 6 3 6 6 Individual Demodulator Data Rate Selection 6 4 6 7 Demod Data Rate Selection from the Demod Menu 6 4 6 8 I and Q Data Rate Entry on Front Panel 6 5 6 9 D...

Page 9: ...E Controls 6 28 6 42 SOQPSK LDPC Selection in Individual or Multiple Channels 6 28 6 43 Front Panel SOQPSK LDPC Settings 6 29 6 44 SOQPSK LDPC Settings on Remote GUI 6 30 7 1 Bit Sync Frame Sync BERT Window 7 1 8 1 TM over IP Block Diagram 8 1 8 2 General Chapter 10 Packet Structure 8 3 8 3 General Time Packet 8 3 8 4 TM over IP Setup on Remote GUI 8 4 8 5 IP Address Netmask and Gateway Settings o...

Page 10: ... instructions for set up operation and status monitoring of the RC100C 2 Diversity Combiner including but not limited to Combiner modes Best Source Selection feature AGC Zero CH1 CH2 balancing feature and combiner AM and AGC Section 6 Multi Mode Demodulator Operation provides a description and instructions pertaining to set up operation and status monitoring of the RC100C 2 Demodulator feature inc...

Page 11: ...eliminated by insertion of this buffer This buffer is analogous to a DMZ demilitarized zone in a network router Last but not least local control and display functionality is retained Figure 2 1 RC100C 2 Spectrum Efficient Ground Receiver Standard RC100C 2 features include A Fully IA Compliant Operational Configuration with buffered ARM Processor design that precludes the ability to externally acce...

Page 12: ...l CH10 IRIG 218 TM over I P D Viterbi Forward Error Correction FEC E Turbo Coding FEC 2 2 Receiver Hardware Installation Ensure safe system installation for operation i e secured in the equipment rack or safely positioned on a non slip work surface that can support the system size and weight Figure 2 2 illustrates the RC100C 2 front panel displays and keypad controls as well as rear panel I O with...

Page 13: ...via display indicators numerical readouts and bar graphs on both the remote GUI display and front panel LCD displays Figure 2 3 RC100C 2 SEGR Front Panel LCD Displays and Keypad SEMCO developed System Level Telemetry Software SLTS program software controls and displays are shown in Figure 2 4 The remote GUI and front panel keypad controls displays provide for all required receiver control and stat...

Page 14: ...messages dictionary This provides a low overhead streamlined remote interface that leverages the existing receiver remote server 2 4 System Boot and Shutdown Start the RC100C 2 by depressing the red Power button located on the front panel In approximately 45 seconds the auto boot process enables the front panel LCD displays previously shown in Figure 2 3 Receiver Shutdown is accomplished by simply...

Page 15: ...ion first select a desired FUNCTION from one of the square buttons The far right display next to the keypad will change to the function selected In certain cases TUNER MOD MODE DEMOD and COMB MODE there is an option to change parameters for ALL CH1 CH2 or Combiner In certain cases there is also a and in the top title bar of the display and the CH1 CH2 or Combiner selection will be displayed i e Ch...

Page 16: ...right display for desired settings use the LEFT 4 and RIGHT 6 arrow to move the bright magenta top title bar to the display of choice Then using the far right display scroll UP 2 and DOWN 8 arrows until the setting desired is highlighted Press ENTER or SELECT 5 and the selected setting will appear in the display of choice Repeat the steps above for the other front panel displays as desired 2 4 2 1...

Page 17: ...play is as previously shown in Figure 2 6 F Step 6 Using the DOWN 8 arrow scroll to General Settings and press ENTER G Step 7 Using the LEFT 4 arrow move the bright magenta top title bar to the third from left display and press ENTER to enable a green General Settings display as depicted in Figure 2 8 Figure 2 8 General Settings Display H Step 8 Select DISPLAY on the keypad and verify the far righ...

Page 18: ...ing the main CH1 CH2 and Combiner settings Ch1 Ch2 and CMB with respect to Frequency Demodulation Format and Data Rate The far right display provides General Status of CH1 CH2 and the Combiner channel Figure 2 10 Front Panel Display Settings Example Figure 2 11 shows all available display selections available with the corresponding screen display associated with each selection Steps 1 thru 9 above...

Page 19: ...onizer Demodulator A Top bar in Tuner Status displays is GREEN for Synthesizer LOCK and RED for UNLOCK B Top Bar in Combiner Status displays is GREEN for Combiner LOCK and RED for UNLOCK C Top Bar in Demod Status displays is GREEN for Demodulator and Bit Synchronizer LOCK YELLOW with Demodulator only LOCK and RED for UNLOCK 2 5 Initial SLTS Remote Network Setup Figure 2 13 shows Client and RC100C ...

Page 20: ...n Figure 2 16 The IP addresses of each connected RC100C 2 will be listed Figure 2 16 Receiver IP Address Search Step 4 Copy down all listed receiver IP addresses Open the SLTS Program and click on Edit System Address List and Add as shown in Figure 2 17 In the Create System Connection Setup window enter each connected receiver IP address by typing in each IP address in the window below IP Address ...

Page 21: ...Gateway and other parameters can be set here Make the desired changes and then reboot the Lantronix program by clicking on SYSTEM and Reboot Wait until the system completely reboots After reboot check the Lantronix program DeviceInstaller per paragraph 2 5 Step 3 above to verify settings Step 3 Open the SEMCO SLTS remote software and add the new receiver IP Address and Name per Step 4 and Figure 2...

Page 22: ...in Figure 2 19 Referring to Figure 2 19 the user double clicks on any information window in the SLTS Receiver Status Window which accesses the Receiver Control Window as shown The user then clicks on System Config and Naming Options in the Receiver Control Window Toolbar This provides access to the System Name window and the user can now enter system names for the overall System Name Channel 1 Cha...

Page 23: ...ll find similarities in SLTS in terms of simplicity and intuitive layout of all displays menus and controls Importantly SLTS incorporates the best of RCMS design while taking advantage of new design features based upon years of experience and feedback from users of the RCMS program 2 6 1 Toolbar Features There are several GUI Toolbar features that facilitate use of the receiver for mission support...

Page 24: ...ser clicks on System Config and then Frequency Diversity Demods to activate the SLAVING ON Freq Diversity indication as shown Figure 2 20 also shows how to enable Diversity Slaving The user clicks on System Config and then on Diversity Tuners Demods which activates the SLAVING ON Diversity indication as shown The Slaving feature using the front panel LCD displays and keypad is accessible using the...

Page 25: ...splay during a mission The user clicks on AGC Data Logger and Strip Chart to enable this feature Controls on the Strip Chart Display include Start Pause Reset and Auto All 3 channels are displayed One channel is illustrated here Figure 2 23 AGC Strip Chart Display Figure 2 24 shows the AGC Data Logger and System Parameters Logger which provides the ability to time stamp and log both AGC output vol...

Page 26: ... same setup sequence Figure 2 24 AGC Data System Parameters Logging The AGC Data System Parameters Logging feature is not accessible using the front panel LCDs and keypad Figure 2 25 shows the Combiner Zero feature which allows the user to monitor the CH1 and CH2 AGC voltage inputs to the Combiner These voltages go to zero when the Combiner CH1 Zero and CH2 Zero feature is enabled and viewing this...

Page 27: ...enabling of the TMoIP feature using the front panel LCD displays and keypad will be addressed in the next revision of this manual Figure 2 27 TM over IP Feature The RC100C 2 also provides a Bit Synchronizer Frame Synchronizer BERT and PN Pattern Generator option The enabling of these features on the remote GUI as well as the front panel LCD displays and keypad will be addressed in the next revisio...

Page 28: ... the DOWN 8 arrow to scroll down to Eye Pattern I Eye Pattern Q or Constellation and presses ENTER The user then uses the DOWN 8 arrow to select Ch1 Ch2 or Comb and presses ENTER Once the desired selection is made DELETE EXIT is pressed to return the display to its original setting Eye Pattern Q is shown in the Figure 2 29 example The user repeats these steps for selecting either Eye Pattern I or ...

Page 29: ...save Presets using the remote GUI The user clicks on Presets and then Save to access the Save Preset window as shown In a networked system the list of receivers in the network is listed in this window and the user selects which receiver settings to be saved In the example Receiver 19035 0001 is running in a local SLTS environment as the only connected receiver The user then clicks on OK to access ...

Page 30: ...t window where the user can select the receivers listed under Select Receivers to be loaded with the selected preset and then press OK as shown Major saved receiver parameters are listed under Preview as shown Figure 2 31 Load Presets Feature Referring to Figure 2 31 again the user can delete any preset by clicking on the Delete Preset button after selecting the preset to be deleted 2 8 Help Featu...

Page 31: ...C Output 10 20 or 50 dB V selectable HI LO impedance J20 BNC COMB AM AM Output 2 0 Vp p 50 AM selectable 50 or 75 Ohm impedance J9 BNC COMB VID 0 0 4 VDC Analog Baseband Video Output 75 Ohm impedance J10 BNC COMB VID 1 0 4 VDC Analog Baseband Video Output 75 Ohm impedance J7 BNC COMB VID 2 Digital TTL Clock Output 75 Ohm Impedance J8 BNC COMB VID 3 Digital TTL Data Output 75 Ohm Impedance J3 BNC C...

Page 32: ...le Frequency Offset Absolute Relative and Antenna Signal Strength displays and AGC voltage displays 3 1 2 Diversity Combiner Hardware The Diversity Combiner is a pre d post d optimal ratio combiner that processes the modulated CH1 and CH2 70 MHz AGC and AM and provides up to 3 0 dB C N improvement at equal input signal levels Combiner features include A Routing of CH1 CH2 or Combined Signal thru t...

Page 33: ...h receiver and combiner channel 3 1 5 TM over IP Option The TM over IP option supports multiple IRIG standard telemetry data formats DQM DQE interfaces and user specified custom interfaces consult the factory The main interfaces required by users will be the IRIG PCM data Interfaces and IRIG Chapter 10 Interfaces The embedded TM over IP function accepts data and clock signals from the three receiv...

Page 34: ...Frequency Selection Both CHs Using Front Panel Displays and Keypad To select only CH1 or CH2 the operator pushes FREQ again on the keypad for Ch1 Figure 4 2 uses the numerical keypad to enter the desired frequency and then pushes ENTER The RF frequency of CH1 is changed Pushing FREQ again allows the operator to change the frequency of CH2 Ch2 Pushing FREQ again exits the menu Figure 4 2 RF Frequen...

Page 35: ...illustrates the process for enabling the CIF Mode The operator pushes the TUNER button to access the Tuner Menu uses the UP 2 and DOWN 8 arrows to highlight CIF En in blue as shown pushes ENTER or SELECT 5 to highlight OFF ON in bright magenta pushes the DOWN 8 arrow to select ON and then pushes ENTER or SELECT 5 to turn Ch1 CIF En ON The operator then uses the horizontal LEFT 4 and RIGHT 6 arrows...

Page 36: ...its Enter The box will return to gray when the new frequency is accepted The SYNTH window to the right of the Frequency box indicates a green LOCK when the receiver is capable of tuning to different frequencies and a red UNLOCK when either the 10 MHz reference is not functioning properly or there is an RF Tuner malfunction The user is not able to select a frequency when this situation occurs Figur...

Page 37: ...R or SELECT 5 to enable the GENERAL STATUS display and an Absolute RSSI SSI as shown Figure 4 8 Absolute RSSI Status Display 4 2 2 Front Panel Relative RSSI Display The Relative RSSI feature provides the ability to zero the RSSI reading which then indicates the positive or negative RF signal strength relative to this zero indication This feature is usually enabled at the noise floor prior to recei...

Page 38: ...GC Zero and Relative RSSI Status Settings 4 2 3 Front Panel Antenna Signal Strength Display Antenna Signal Strength provides an indication of signal strength at the antenna based on a user specified Correction Factor Antenna CF that is the insertion loss gain between the antenna and receiver Figure 4 10 illustrates the Antenna Signal Strength feature using the front panel displays and keyboard The...

Page 39: ... a numerical value that represents the antenna to receiver insertion gain or loss i e Correction Factor The operator repeats these steps to enter an Antenna Correction Factor in the second receiver channel Once both receiver channels have the Antenna Correction Factor enabled and a numerical insertion gain or loss Correction Factor entered then the operator can push the DISPLAY button use the UP 2...

Page 40: ... depicts the RSSI Maximum Max and Average Avg Signal Level feature which provides the user with both maximum and average RF signal levels as they occur during a mission The user places the cursor over the RSSI bar as shown in order to obtain these RF signal level readouts Figure 4 12 Maximum Average Signal Strength Indicator on Remote GUI The Antenna Signal Strength feature Figure 4 13 provides an...

Page 41: ...pushes the TUNER button uses the UP 2 and DOWN 8 arrows to scroll to IFBW in blue and then pushes ENTER or SELECT 5 to highlight the IFBW value window in bright magenta The operator then uses the UP 2 and DOWN 8 arrows to select one of 14 SAW IFBW filter values available and pushes ENTER or SELECT 5 to set the Ch1 IFBW value For Ch2 the operator uses the horizontal LEFT 4 and RIGHT 6 arrows to cha...

Page 42: ...perator then uses the UP 2 and DOWN 8 arrows to select the desired IF FIR BW value or Auto and pushes ENTER or SELECT 5 as shown to set the Ch1 IF FIR BW value or enable the Auto feature For Ch2 and Comb IF FIR BW the operator uses the horizontal LEFT 4 and RIGHT 6 arrows to change the Demod Menu to Ch2 or Comb and pushes ENTER or SELECT 5 to highlight the IF FIR BW value window in bright magenta ...

Page 43: ...reater than the recommended IRIG value for the data rate and demodulation mode selected Figure 4 16 IF SAW Filter Bandwidth Selection on Remote GUI 4 3 4 Remote GUI IF FIR Filter Selection Figure 4 17 shows how to select IF FIR filter bandwidth value IF FIR filter selection is a pull down menu accessed by clicking on Advanced Settings and then clicking on the arrow icon to the right of the Demod F...

Page 44: ...erical AM LPF value and pushes ENTER or SELECT 5 For AM Polarity the operator pushes the TUNER button uses the UP 2 and DOWN 8 arrows to scroll to AM Polarity in blue and then pushes ENTER or SELECT 5 to highlight the AM Polarity window in bright magenta The operator then uses the UP 2 and DOWN 8 arrows to select Normal or Inverted and pushes ENTER or SELECT 5 to set the AM Polarity Using the hori...

Page 45: ...rols window for receiver CH1 and CH2 AM LPF frequency is entered by clicking on the Filter Hz box and typing and entering the desired frequency between 30 Hz and 30 kHz Clicking on the Up Down arrows to the right of the box changes the frequency in 1 Hz increments Clicking on the Polarity box changes the AM polarity to either normal NORM or inverted INV Clicking on the Impedance box changes the AM...

Page 46: ...l pushes ENTER or SELECT 5 to highlight the AGC Slope window in bright magenta uses the UP 2 and DOWN 8 arrows to select the desired Slope and pushes ENTER or SELECT 5 For the Combiner channel the operator pushes the COMB MODE button and repeats the process Referring again to Figure 4 20 for AGC Polarity selection the operator pushes the TUNER button uses the UP 2 and DOWN 8 arrows to scroll to AG...

Page 47: ...f these AGC time constant values will affect the attack and recovery time of the linear 70 MHz IF output as well as the internal 70 MHz input to the demodulator It does not affect the attack and recovery time of the demodulated AM output signal The AM signal output is at a fixed 300 ms AGC time constant that provides optimum AM response for ACU antenna tracking functions while the ability to selec...

Page 48: ...surements Without AGC Freeze the receiver would normally amplify incoming signals including noise at different gain levels as determined by the selected IF filter bandwidth Freezing holding the receiver gain at a fixed level independent of signal input level allows the operator to measure signal noise floor levels by measuring the IF output at different noise input levels The AGC Freeze mode shoul...

Page 49: ... operator selects Ch2 AGC Freeze and pushes ENTER or SELECT 5 to highlight the AGC Freeze ON OFF window in bright magenta Using the UP 2 and DOWN 8 arrows the operator selects ON and pushes ENTER or SELECT 5 Figure 4 23 AGC Freeze Feature Using Front Panel 4 5 4 Remote GUI AGC Slope and Polarity Clicking on the arrow icon in the AGC Slope and Polarity boxes enables the pull down menus as shown in ...

Page 50: ...r connecting the AGC output to devices with an input impedance of 5K ohms Low Z or 5K ohms High Z Figure 4 25 AGC Output Impedance on Remote GUI 4 5 6 Remote GUI AGC Zero The operator clicks on the window below AGC Zero which turns ON Figure 4 26 The Absolute Signal Strength indicator changes to Relative Signal Strength when AGC Zero is enabled and the readout is 0 dB relative to the signal level ...

Page 51: ...eze mode should not be used for receiver mission support The receiver also has programmable attenuators in the RF Tuner design that ensures front end protection as well as provide for a linear and calibrated dynamic range However attenuator operation will sometimes affect the accuracy of antenna G T measurements at approximately 70 dBm to 50 dBm noise floor levels Accordingly an Attenuator Disable...

Page 52: ...receiver rear panel This 70 MHz RF input can be a pre d IF signal from any external source and includes recorded pre d This recorded pre d 70 MHz input can be played back through the receiver during post mission analyses The rear panel access for this feature is CH1 IF In and CH2 IF In BNC connectors Figure 4 30 illustrates the front panel set up for receiving a 70 MHz IF pre d signal Right click ...

Page 53: ... arrows the operator selects Ch2 in the Tuner Menu header display bar and then pushes ENTER or SELECT 5 to highlight the Ch2 RF Input ON OFF window in bright magenta The operator then uses the UP 2 and DOWN 8 arrows to select ON and pushes ENTER or Select 5 for a Ch2 70 MHz RF IF input Figure 4 30 70 MHz RF IF Pre d and Playback Using Front Panel Accessing the 70 MHz Pre d Playback feature on the ...

Page 54: ...neral Status display and a RED Combiner Lock strip when in an Unlocked status BSS Video Mode This mode allows the user to select the Combiner as a Best Source Selector which then outputs the stronger of CH1 or CH2 RF signals rather than provide a combined output when the PLL is unlocked Combiner Zero RCV 1 Ch1 Zero This function allows the user to zero the AGC CH1 input to the combiner and is used...

Page 55: ... or CH2 is selected or any Combiner Unlock condition exists See paragraph 5 1 3 for steps required to access the General Status display Selecting either CH1 or CH2 forces the selected channel through the Combiner Channel s Demodulator and the Combiner Channel Video and IF Outputs on the rear panel are now the selected channel Figure 5 1 Front Panel Diversity Combiner Output Mode Selection 5 1 2 Co...

Page 56: ...g mode When the combiner is Unlocked and BSS is not activated the combiner will still output a combined signal The optimal ratio weighting circuitry will maximally bias the strongest channels in the combiner circuit When BSS mode Combiner Menu Video Mode on Front Panel is enabled and the combiner is unlocked it will physically switch the IF output from Combined to CH1 or 2 5 1 4 Combiner Status Wi...

Page 57: ...nel displays and keypad The operator pushes the COMB MODE button to access the Combiner Menu uses the UP 2 and DOWN 8 arrows to scroll to Video Mode in blue and then pushes ENTER or SELECT 5 to highlight the Video Mode selection window in bright magenta Using the UP 2 and DOWN 8 arrows the operator selects ON or OFF and then pushes ENTER or SELECT 5 Figure 5 5 Diversity Combiner Best Source Select...

Page 58: ...the UP 2 and DOWN 8 arrows to scroll to Ch1 Zero in blue and then pushes ENTER or SELECT 5 to highlight the Ch1 Zero selection window in bright magenta Using the UP 2 and DOWN 8 arrows the operator selects ON and then pushes ENTER or SELECT 5 The operator uses the UP 2 and DOWN 8 arrows to scroll to Ch2 Zero in blue and pushes ENTER or SELECT 5 to highlight the Ch2 Zero selection window in bright ...

Page 59: ...arrows the operator selects 10 20 or 50 dB V and then pushes ENTER or SELECT 5 The operator uses the UP 2 and DOWN 8 arrows to scroll to AGC Polarity in blue and pushes ENTER or SELECT 5 to highlight the AGC Polarity selection window in bright magenta Using the UP 2 and DOWN 8 arrows the operator selects Positive or Negative and then pushes ENTER or SELECT 5 Figure 5 9 Front Panel Combiner AGC Slo...

Page 60: ...ro zeroes the AGC voltage level at any signal level typically the noise floor Figure 5 12 illustrates the steps for enabling the Combiner AGC Zero feature using the front panel displays and keyboard The operator pushes the COMB MODE button to access the Combiner Menu uses the UP 2 and DOWN 8 arrows to scroll to AGC Zero in blue and then pushes ENTER or SELECT 5 to highlight the AGC Zero selection ...

Page 61: ...A2537 002 01 February 2020 5 8 SEMCO Proprietary Information Figure 5 13 Combiner AGC Zero Feature on Remote GUI ...

Page 62: ... fastest acquisition time Tier 0 I and II with Track Loop Bandwidth for PM PSK and SOQPSK TG FM Low Data Sweep Rate 10 kbps feature Adaptive Equalization Data Quality Metrics DQM and Data Quality Encapsulation DQE SOQPSK Low Density Parity Check SOQPSK LDPC SOQPSK Space Time Coding SOQPSK STC I Q Interleaving Viterbi and Turbo Forward Error Correction Option These features are accessible from both...

Page 63: ...y and uses the UP 2 and DOWN 8 arrows to scroll to the desired demodulation mode in blue The operator then pushes ENTER or SELECT 5 Figure 6 2 Demod Mode Selection Using Front Panel MOD MODE Controls The operator can change the demodulation format for Ch1 Ch2 Comb or all 3 demodulators All by using the horizontal LEFT 4 and RIGHT 6 arrows to change the Modulation Input display bar as shown in Figu...

Page 64: ...trols is shown in Figure 6 5 The operator selects DATA RATE on the keypad and then uses the numerical keypad to enter the desired data rate The data rate will read in kbps and then switch to Mbps for data rate entry above 1 0 Mbps The operator pushes ENTER or Select 5 and the data rate of Ch1 Ch2 and Combiner demodulators are changed Figure 6 5 Demodulator Data Rate Selection Using Front Panel Dis...

Page 65: ...LEFT 4 and RIGHT 6 arrows the operator selects Ch2 and Comb in the Demod Menu header to change the Modulation Input display bar The operator then pushes ENTER or SELECT 5 uses the numerical keypad to enter the desired data rate and pushes ENTER or Select 5 to set the demodulator Data Rate A in each of these channels As previously mentioned the data rate only needs to be entered once for all 3 chan...

Page 66: ...board Placing the cursor over the Data Rate box provides an indication of the data rate range for the selected demodulator mode Figure 6 9 Data Rate Entry on Remote GUI Figure 6 10 shows the Data Rate A and Data Rate B window that appears on the remote GUI when either the AQPSK or AUQPSK demodulator format is selected This allows the user to type in desired different Asynchronous data rates for th...

Page 67: ...utputs is determined by 0 7 x Data Rate 2 All other Video FIR BW values are normally 0 7 x Data Rate These values are not absolute and 15 selectable Video FIR Bandwidth values for every data rate are provided For Video FIR Bandwidth selection the operator pushes the DEMOD MODE button to access the Demod Menu display uses the UP 2 and DOWN 8 arrows to scroll to BASEBAND VIDEO BW in blue and then pu...

Page 68: ... AUQPSK demodulator formats analog I and Q outputs As previously mentioned the Analog A and Analog B Gain values only need to be entered once for all 3 channels if Diversity Slaving is enabled Figure 6 12 Front Panel Analog Video Gain Selection Figure 6 13 shows how to select Baseband Video FIR Filter values using the remote GUI Video BW displays the Video FIR filter bandwidth and 15 selectable FI...

Page 69: ... steps for enabling the embedded bit sync de randomizer The operator pushes the DEMOD MODE button to access the Ch1 Demod Menu display uses the UP 2 and DOWN 8 arrows to scroll to BS DE RANDOMIZER in blue and then pushes ENTER or SELECT 5 to highlight the selection window in bright magenta The operator then uses the UP 2 and DOWN 8 arrows to select ON and pushes ENTER or SELECT 5 Using the horizon...

Page 70: ... desired INPUT CODE and pushes ENTER or SELECT 5 Using the horizontal LEFT 4 and RIGHT 6 arrows the operator selects Ch2 in the Demod Menu header display bar pushes ENTER or SELECT 5 to highlight the selection window in bright magenta uses the UP 2 and DOWN 8 arrows to select INPUT CODE and then pushes ENTER or SELECT 5 Using the horizontal LEFT 4 and RIGHT 6 arrows again the operator selects Comb...

Page 71: ...7 The operator pushes the DEMOD MODE button to access the Ch1 Demod Menu uses the UP 2 and DOWN 8 arrows to scroll to BS Clock Phase in blue and then pushes ENTER or SELECT 5 to highlight the selection window in bright magenta Using the UP 2 and DOWN 8 arrows the operator selects a Clock Phase and pushes ENTER or SELECT 5 Using horizontal LEFT 4 and RIGHT 6 arrows the operator selects Ch2 in the D...

Page 72: ... and then pushes ENTER or SELECT 5 to highlight the selection window in bright magenta Using the UP 2 and DOWN 8 arrows the operator selects ON and pushes ENTER or SELECT 5 Using the horizontal LEFT 4 and RIGHT 6 arrows the operator selects Ch2 in the Demod Menu header display bar pushes ENTER or SELECT 5 to highlight the selection window in bright magenta uses the UP 2 and DOWN 8 arrows to select...

Page 73: ...width value BW of the embedded Bit Synchronizer Changing this value affects the ability of the Bit Synchronizer to lock on the demodulated waveform In general terms a narrower bandwidth provides for a lower lock threshold A wider bandwidth is more tolerant of waveform anomalies but will require a higher C N threshold to lock The Auto Bandwidths feature automatically calculates and sets an optimum ...

Page 74: ...ng provides the user with 15 IF FIR filter value selections based on the data rate and demodulation format This IF FIR Filter Bandwidth menu is updated with the appropriate FIR filter values each time a different data rate and or demodulator format is selected Auto IF FIR Filter Bandwidth settings are described in Section 4 paragraphs 4 3 2 and 4 3 4 6 7 1 Auto Loop Bandwidths Sweep Range and Swee...

Page 75: ... operator repeats these steps for Comb Figure 6 21 Front Panel AUTO Bandwidth and Sweep Settings Referring again to Figure 6 21 and the steps for enabling AUTO Loop Bandwidths Sweep Range and Sweep Rate the operator can disable the AUTO function by following the same steps outlined for enabling AUTO except selecting OFF rather than ON for each function With AUTO disabled and still in Demod Menu Ch...

Page 76: ...00 kHz D Sweep Rate 1 0 Hz to 20 MHz Figure 6 22 shows Auto Bandwidths Sweep Range and Sweep Rate settings on the remote GUI Clicking on each box under Auto enables Auto Bandwidth Bit Sync and Carrier Loop Bandwidth Sweep Range and Sweep Rate Clearing the boxes and clicking on Advanced Settings provides for typing in values for each Bandwidth and Sweep setting Figure 6 22 AUTO and Manual Bandwidth...

Page 77: ...multiple signal sources antennas Embedded in the baseband video signal as it is processed by the receiver s demodulator This DQM data is presented to a Best Source Selector BSS which then selects the best signal over time based on a signal quality algorithm DQM Frame Size Payload Length is user selectable DQM parameter G LDPC Low Density Parity Check LDPC is a Forward Error Correction FEC block co...

Page 78: ...be improved over bandwidth or latency constrained links in the presence of data corrupting noise Turbo codes provide very similar performance when compared to LDPC FEC 6 8 1 Fast Acquire The Fast Acquire feature optimizes the demodulator acquisition of the incoming signal as fast as possible and is applicable to FM Trellis FM and SOQPSK TG Figure 6 23 shows how to enable Fast Acquire using the Fro...

Page 79: ...shes the DEMOD button to enable the Ch1 Demod Menu display uses the UP 2 and DOWN 8 arrows to scroll to CARRIER LOOP BW DIV in blue and then pushes ENTER or SELECT 5 to highlight the selection window in bright magenta The operator then uses the UP 2 and DOWN 8 arrows to select one of the 4 Loop Bandwidth Divider values and pushes ENTER or SELECT 5 Using the horizontal LEFT 4 and RIGHT 6 arrows the...

Page 80: ...center frequency is swept when demodulating narrow FM signals to ensure that the desired signal is centered in the selected IF FIR Filter bandpass Figure 6 27 shows how to enable FM Sweep using the Front Panel LCDs and Keypad The operator pushes the DEMOD button to enable the Ch1 Demod Menu display uses the UP 2 and DOWN 8 arrows to scroll to FM SWEEP in blue and then pushes ENTER or SELECT 5 to h...

Page 81: ...using the Front Panel LCDs and Keypad The operator pushes the DEMOD button to enable the Ch1 Demod Menu display uses the UP 2 and DOWN 8 arrows to scroll to Anlg Filter in blue and then pushes ENTER or SELECT 5 to highlight the selection window in bright magenta The operator then uses the UP 2 and DOWN 8 arrows to select Bypass De Emph 6 MHz LPF or 27 MHz LPF and pushes ENTER or SELECT 5 Using the...

Page 82: ... 30 peak deviation and 0 4 40 peak deviation Manual Mod Indexing is normally used when the transmitter peak deviation is a known and fixed value between 0 3 and 0 4 Figure 6 31 shows how to enable either Auto or Manual Modulation Indexing using the Front Panel LCDs and Keypad For Auto Modulation Indexing the operator pushes the DEMOD button to enable the Ch1 Demod Menu display uses the UP 2 and DO...

Page 83: ...ct Manual and pushes ENTER or SELECT 5 The bright magenta display indicates 0 00 the operator uses the numerical keypad to enter a Mod Index value between 0 3 and 0 4 and then pushes ENTER or Select 5 Using the horizontal LEFT 4 and RIGHT 6 arrows the operator selects Ch2 and pushes ENTER or SELECT 5 to highlight the selection window in bright magenta The operator then uses the UP 2 and DOWN 8 arr...

Page 84: ...EP of the demodulator s received signal Data Quality Encapsulation DQE enables telemetry receivers to generate a serial data stream that includes a standardized measurement of the real time probability of error for a grouping of bits This process provides a standardized method for communicating data quality to Best Source Selectors DQM is determined over several symbols Payload encapsulated into t...

Page 85: ... of received data bits in a DQE frame The DQM is calculated over these bits The valid range is 1024 to 16384 bits and the mission Frame Size value using DQM will be known by the user C Frame Word A combination of the RSV VER parameters of the DQE frame the Frame Word is set as a hexadecimal value Controls are provided to support any changes in the IRIG Standard and for test purposes It should alwa...

Page 86: ...value between 1024 and 16384 bits and pushes ENTER or Select 5 Using the horizontal LEFT 4 and RIGHT 6 arrows the operator selects Ch2 and then pushes ENTER or SELECT 5 to highlight the respective selection window in bright magenta The operator then uses the numerical keypad to enter the FRAME SIZE value and pushes ENTER or Select 5 The operator repeats these steps for Comb Figure 6 36 DQM Frame S...

Page 87: ...nt Panel LCDs and Keypad The operator pushes the DEMOD button to enable the Ch1 Demod Menu display uses the UP 2 and DOWN 8 arrows to scroll to ADAPTIVE EQUALIZATION in blue and then pushes ENTER or SELECT 5 to highlight the ON OFF window in bright magenta The operator then uses the UP 2 and DOWN 8 arrows to select ON and pushes ENTER or SELECT 5 Using the horizontal LEFT 4 and RIGHT 6 arrows the ...

Page 88: ... block sizes 1024 and 4096 are applicable In addition the receiver provides for a selectable CCSDS and IRIG de randomizer LDPC is only used with SOQPSK TG modulation Figure 6 40 illustrates how to select the SOQPSK LDPC demodulation format rate block size and de randomizer Front Panel display is LDPC which when selected is SOQPSK LDPC The operator pushes the DEMOD MODE button to access the Ch1 Dem...

Page 89: ...lay and uses the UP 2 and DOWN 8 arrows to scroll to LDPC in blue The operator then pushes ENTER or SELECT 5 Figure 6 41 SOQPSK LDPC Selection Using Front Panel MOD MODE Controls The operator can change the demodulation format for Ch1 Ch2 Comb or all 3 demodulators All by using the horizontal LEFT 4 and RIGHT 6 arrows to change the Modulation Input display bar as shown in Figure 6 42 and then push...

Page 90: ... ENTER or SELECT 5 to highlight the selection window in bright magenta The operator then uses the UP 2 and DOWN 8 arrows to select 1024 or 4096 and pushes ENTER or SELECT 5 Using the horizontal LEFT 4 and RIGHT 6 arrows the operator selects Ch2 and pushes ENTER or SELECT 5 to highlight the selection window in bright magenta The operator then uses the UP 2 and DOWN 8 arrows to select 1024 or 4096 a...

Page 91: ...n clicks on the arrow in the Block Size window and selects either 1024 or 4096 from the pull down menu LDPC Rate is selected by clicking on the arrow in the Rate window and selecting 4 5 2 3 or 1 2 rate from the pull down menu The LDPC De randomizer is selected by clicking on the arrow in the DeRandom window and selecting Off CCSDS or IRIG from the pull down menu Figure 6 44 SOQPSK LDPC Settings o...

Page 92: ...n The input bit stream is space time coded resulting in two parallel bit streams that then have a pilot sequence added to each bit stream at fixed bit intervals or blocks These encoded pilot added streams are then individually modulated through phase locked transmitters to a carrier using SOQPSK TG modulation power amplified and then connected to a top and bottom antenna Space time decoding of thi...

Page 93: ...option has user selectable internal switching from each demodulator and external from rear panel input switching programmable Bit Synchronizer Frame Synchronizer BERT and PN Generator It can be used as an independent Bit Sync Frame Sync BERT or used in conjunction with each channel s demodulator output for TTL and RS422 bit sync frame sync outputs as well as BER loop testing of each receiver and c...

Page 94: ...ls using the front panel LCD displays and Keypad will be incorporated in the next revision to this manual 8 2 PCM TM over IP Operating the TM over IP module in PCM mode supports IRIG chapter4 8 Format 1 data This interface transfers the demodulated data by routing the recovered clock and data signals to the TM over IP module In this mode the data is transported in data packets to the reception dev...

Page 95: ...or Future Use 0x06 0x30 Message Data Format 0 Generic Message Data 0x06 0x31 37 Message Data Format 1 7 Reserved for Future Use 0x06 0x38 ARINC 429 Data Format 0 ARINC 429 Data 0x06 0x39 3F ARINC 429 Data Format 1 7 Reserved for Future Use 0x06 0x40 Video Data Format 0 MPEG 2 H 264 Video 0x06 0x41 Video Data Format 1 ISO 13818 1 MPEG 2 0x06 0x42 Video Data Format 2 ISO 14496 10 MPEG 4 Part 10 AVC ...

Page 96: ...own in Figure 8 2 Figure 8 2 General Chapter 10 Packet Structure The receiver will support 16 bit and 32 bit aligned unpacked mode as defined in IRIG subsections a b c of section 11 2 1 Timing is transmitted as specified in IRIG Chapter 11 section 11 2 3 2 and is treated like another data channel The general time packet structure is shown in Figure 8 3 Figure 8 3 General Time Packet ...

Page 97: ...mote GUI is depicted in Figure 8 4 The user clicks Windows on the Toolbar and then TMoIP on the pull down menu This accesses the TMoIP Control Window as shown Figure 8 4 TM over IP Setup on Remote GUI Figure 8 5 shows how to enter the IP Address Net Mask and Gateway settings The user clicks on each box types in the desired values and the window turns red until the user clicks on Commit Figure 8 5 ...

Page 98: ...mined by 2 round trip latency jitter Network round trip latency and jitter values must be measured normally known for a given network and then the Network Buffers value can be determined and entered using this equation C Multicast Also based on UDP IP this selection allows the channel to send its data to multiple target channels at different IP addresses When configuring the receiver AL113 TM over...

Page 99: ...es This parameter sets the IP Address of the remote unit on the other side of the link i e receiving device Each channel has its own remote IP address parameter and can communicate with individual chassis and devices The Multicast protocol value must be in the range of 224 0 0 0 to 239 255 255 255 Establishing remote IP addresses using the remote GUI are shown in Figure 8 8 The user clicks on the ...

Page 100: ...t Entry on Remote GUI 8 4 5 Data Header This parameter specifies whether to use the standard TMoIP header use a slightly modified header to allow for time to be multiplexed into the header before the data or use CH10 header format The TMoIP specification requires that bit 9 of the header is reserved and set to zero Time TMoIP sets this bit to one and places metadata after the TMoIP header and befo...

Page 101: ...dded TM over IP module and should always match the receiver s baseband video output impedance which is normally 75 ohms Input Termination selection using the remote GUI is shown in Figure 8 11 The user clicks on the arrow icon next to the Input Imped window which accesses a pull down window as shown The user then selects 50 Ω 75 Ω or High Z Figure 8 11 Input Termination Selection on Remote GUI ...

Page 102: ...m Latency or Maximum Bandwidth Figure 8 12 Data Buffering Selection on Remote GUI 8 4 8 MTU Size The maximum transmission unit MTU is the maximum size of a single data unit of digital communications that can be transmitted over a network The MTU size is an inherent property of a physical network interface and is usually measured in bytes The MTU for Ethernet for example is 1500 bytes This MTU size...

Page 103: ...ering and RUDP re transmits When operating on a jittery network the Rx Buffers should be at least the number of milliseconds of jitter For example if the network has a delay of 30 milliseconds and jitter of 5 milliseconds the Rx Buffers should be set to a minimum of 5 milliseconds Entering an Rx Buffers value using the remote GUI is shown in Figure 8 14 The user clicks on the Rx Buffers ms window ...

Page 104: ...9 the user commences with Ethernet transmission Figure 8 15 shows how to start transmission of packetized data via Ethernet using the remote GUI The user clicks on the Ethernet Flow box and the box turns GREEN ON indicating that Data Transmission has commenced The Input 1 Input 2 and Input 3 indicators turn RED indicating Channel Transmission Input 2 shown as example Figure 8 15 TM over IP Transmi...

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