LCS-300 User`s Manual - Electronic Devices, Inc.
Contents
1. 10 to 60 degrees centigrade aging lt 1 ppm year Composite Loran Output level range is 0 to 86 5 dB referred to 1 volt p p maximum output for each pulse group Resolution is 0 3 dB step and the accuracy is 1 5 dB over the 86 5 dB range All outputs except for the Group trigger are 600 ohms and can tolerate DC voltages of 20V The Group trigger output is 0 5V with 1K impedance Voltage must not be applied to this output or damage may occur GRI range is 33mS to 500mS resolution is 100uS Slavel TD range limit is 11000uS minimum to GRI 11000uS maximum Resolution is 100 nS Slave2 TD range limit is Slavel TD 11000 uS to GRI 11000uS maximum Resolution is 100 nS ECD range is 10 to 10 uS in 1 uS steps Baud rate is 9600 8 bits no handshake 1 stop bit Size of LCS 300 15 9cm wide x 8 3cm high x 17cm deep including connectors Shipping weight is 2 Kg 9 Warranty Information Unit will be repaired free of charge for one year from date of purchase providing there is no water damage or other evidence of improper use or handling Purchaser must ship unit prepaid to address below EDI will pay the return freight Electronic Devices Inc 3140 Bunch Walnuts Rd Chesapeake VA 23322 USA Phone 757 421 2968 Fax 757 421 0518 www dsts com2. 2 4 LORAN Connection Connect a LORAN receiver to the connector on the lower left of the front panel labeled Composite Loran C Output The LCS 300 can be connected directly to the LORAN receiver or through the LORAN receiver s antenna coupler Read the next section to learn how to set the GRI etc to the required values 3 Controlling the LCS 300 3 1 Command Structure Commands are one or two letters followed by a numeric value No spaces are used All commands must be followed by the enter key For instance to set TD1 to a delay of 27 1234 uSec type x271234 followed by the enter key Commands are case sensitive an uppercase X will set the amplitude for TD1 not the delay 3 2 3 2 1 3 22 3 2 3 3 2 4 3 2 5 3 2 6 32 1 3 2 8 3 2 9 3 2 10 32 11 3 212 3 2 13 3 2 14 3 2 15 3 2 16 3 217 3 2 18 3 2 19 3 2 20 3 2 21 3 222 3 3 3 3 1 3 3 2 3 3 3 3 3 4 3 3 5 3 3 6 3 4 3 4 1 3 4 2 Command List or prints a help file of commands to the terminal D saves current GRI TD ECD amplitude and slew data to eeprom The stored values will be recalled on power up d Recalls stored data from eeprom e n sets negative ECD in uS 0 to 10 uS Shifts the envelope to the left E n sets positive ECD in uS 0 to 10 uS Shifts the envelope to the right i prints out all output data nnn sets amplitude for TD1 TD2 and master to input L n sets additional 10 dB attenuator 1 no atten 0 10dB att
3. ELECTRONIC DEVICES INC P O BOX 15037 CHESAPEAKE VA 23328 PH 757 421 2968 FAX 421 0518 LCS 300 User s Manual V1 20 10 08 11 1 Overview The LCS 300 is a LORAN C signal generator capable of simulating a LORAN chain with a master and two slave stations The signal characteristics are controlled from any ASCII terminal via the RS 232 link The GRI slave TD s and amplitude of the pulse groups can be set These settings can be stored in eeprom to be recalled on power up 2 Setup To prepare the LCS 300 for operation you must connect the power supply and a terminal operating at 9600 baud 8 bits no parity and no handshake 2 1 Power Supply Any power supply providing 9 VDC at 200 mA can be used to power the LCS 300 The plug is a standard 2 5mm power connector with the center pin positive The input voltage must be between 7 and 15 VDC 22 Terminal Microsoft HyperTerm the supplied LCS 300_terminal exe or any terminal program supporting RS232 can be used Set the parameters to 9600 8 N 1 with no handshake and connect the terminal to the DB9 connector on the rear panel using a standard 9 pin serial cable Note that the LCS 300_terminal exe is configured with the correct baud rate for the LCS 300 2 3 Preliminary Test Send enter 0x0D to clear the buffer in the LCS 300 then send a lower case 1 Do this by typing 1 followed by enter The current settings for the GRI TD s and amplitudes will be listed on the terminal screen
4. cting to the high impedance input of an antenna coupler use a series capacitor of 47 pF from the Composite Loran C output to the coupler s antenna terminal for best performance 6 Back Panel Connections The back panel has three status indicators connections for RS 232 and power and a trigger output 6 1 6 2 6 3 6 4 6 5 6 3 1 6 3 2 6 3 3 ETH Electronic Devices Inc Chesapeake VA USA LCS 300 Loran C Signal Generator PWR Manufactured in the U S A The PWR connector is a 2 5mm DC power input Use the supplied wall transformer or any linear power supply that will provide 9 VDC at 250 mA can be used to power the LCS 300 The input voltage must be between 7 and 16 VDC Fusing is internal and auto resets Note that sustained voltages over 16 VDC may damage the internal power supply Switching power supplies may generate noise in the Loran frequency band and are not recommended for low signal level testing The RS 232 connector is a standard DB9 socket The baud rate is preset to 9600 no parity with 8 bits of data and 1 stop bit Only three wires ground Tx data and Rx data are used There is no handshaking Note that the RS 232 port is not galvanically isolated from the LCS300 For minimum noise an external opto isolator should be used Status indicators Status 1 is the power indicator and will illuminate whenever the LCS 300 is connected to a power source Status 2 indicates that the LCS 300 is in the bo
5. en m nnnn sets the GRI 7980 9960 etc M nnn sets the master amplitude 0 255 q n Ifn 1 sets quiet mode where only CSV numerical data is sent to terminal sx nnn sets TD1 slew rate 1 is fastest 255 slowest slew sy n sets TD1 slew rate sX n sets TD1 slew direction 0 decrement 1 increment sY n sets TD2 slew direction S n Starts or stops the TD slew 0 no slew 1 slew TD s t n sets Trig Out for master TD1 or TD2 0 master 1 TD1 2 TD2 v prints out the software version loaded in the LCS 300 x nnnnnn sets the TD1 in tenths of a uS 245678 24567 8 uS X nnn sets TD1 amplitude 0 255 y nnnnnn sets TD2 TD in tenths of a uS Y nnn sets TD2 amplitude 0 255 Basic Command Examples Set the time delay for TD1 to 27208 5 uS x272085 Set time delay for TD2 to 41100 4 uS y411004 Set master pulse group amplitude to 150 M150 Set TD1 pulse group amplitude to 97 X97 Set the ECD to 3 uS E3 Set the ECD to 2 uS e2 Advanced Command Examples Set TD2 slew rate to decrement the delay by 25 nS every 10 GRI Type sx10 to set rate then sX0 to set slew direction to decrement To start the slewing the TD s type S1 Remember to press the enter key after each command Slew data for TD1 may be entered if required Set the trigger at Trig Out connector to coincide with TD2 Type t2 Signal at the Trig Out connector will be a positive pulse that occurs 13 6 uSec be
6. fore the start of the TD2 pulse group 4 Software Updates 4 1 The LCS 300 software can be updated via your RS 232 connection As software features are added periodic update files in hex format may be sent via email They can be installed in the LCS 300 by using the supplied program proglcs exe 4 1 1 Put the proglcs exe program and the updated LCS300 hex file in the same directory The illustrations assume the program and hex file are in the c 4 1 2 Go to Start run and type in the following c proglcs exe 1 COMx Loran hex where x is the connected com port number Type the name of a program Folder document or Internet resource and Windows will open it For you Open Projects LoranSim proglcs exe i COM1 Loran hex vi Cancel Browse 4 1 3 Press the reset RST button on the LCS 300 and click OK on the Run window Note that after a RST status led 2 stays on 5 seconds then goes off You must start the update while status led 2 is on for it to work successfully 4 1 4 If the update is running successfully you will see the following screen ET C WINDOWS system32 commani gt proglcs exe i COM1 Loran hex Reading Target Device ID Found PIC24HJ256GP2 6 lt ID x 71 gt Reading HexFile Reading Target Programming Device 4 1 5 After the update turn the LCS 300 power off for a second then back on before using it You may verify the software version by typing a v then
7. ot loader mode and ready to receive a program update It lights up for 5 seconds after power is applied Status 3 blinks during data transmission The Trig Out connector has selectable trigger points Trigger pulses may be selected for the master slavel or slave2 pulse group The trigger pulse begins 13 6 uS before the start of the selected pulse group The RST button resets the LCS 300 to power up condition and the default parameters will be loaded This is normally used to reset the unit when updating the software via the LCS 300 s boot loader 7 GRI and TD Limits 7 1 7 1 1 7 1 2 7 1 3 7 2 The slave time differences must be chosen so that slavel group starts after the master group has finished transmitting Slave2 pulse group must not start before slavel has finished transmitting The slave groups are composed of 8 pulses spaced 1 mS apart and have a total length of 8 5mS The Master has a length of 10 5 mS Slave 1 gt 10 5 mS Slave 2 gt slave 1 8 5 mS Slave 2 lt GRI 8 5mS It is the users responsibility to make sure the TD values are realizable no error checking is performed on the input data to the LCS 300 If the slaves are allowed to overlap each other or the master the loran receiver may not track properly 8 Specifications 8 1 8 2 8 3 8 3 1 8 4 8 5 8 6 8 7 8 8 8 9 8 10 Power supply requirements are 9VDC at 250 mA maximum Internal time base 10 MHz TCXO 1 ppm over temperature of
8. pressing enter The software version will be displayed on the terminal 5 Front Panel Outputs The front panel has 6 outputs as shown below 5 1 5 2 5 3 5 4 5 5 5 6 esapeake r e OUTPUTS AA 0 00e Grp Trig Master Slave1 Slave2 Option EIH L CS 3 O Oo Loran C Signal Generator The Grp Trig output is a 5V positive going trigger occurring 13 6 uS before the start of the master pulse group It will have the same period as the GRI rate The Master output provides the 9 pulses of the master group The unloaded amplitude is 2 3 Vp p and the source impedance is approximately 600 ohms The Slavel output provides the 8 pulses of the first slave or TD1 group The unloaded amplitude is 2 3 Vp p when loaded and the source impedance is approximately 600 ohms The Slave2 output provides the 8 pulses of the second slave or TD2group The unloaded amplitude is 2 3 Vp p when loaded and the source impedance is approximately 600 ohms The Option output is for future expansion The Composite Loran C output has the master and both slave groups present The unloaded amplitude for each pulse group can be set from 50 uV p p to 1 Vp p in steps of 0 3dB The source impedance is approximately 600 ohms This output is AC coupled and the maximum DC voltage level at this connector must be less than 40 volts This is the output normally used when testing a Loran receiver and may be directly connected to the Loran or through the coupler If conne
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