Summary of Contents for Lotek Wireless SRX 400
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Page 1: Srx_400 Telemetry Receiver
Deleted: 3.6x SRX_400 TELEMETRY RECEIVER USER'S MANUAL Version 4.xx LOTEK Wireless Inc. Newmarket, Ontario, Canada E00033 Rev.A Rev B, ECO 302, 31 Mar 2001... -
Page 2: Table Of Contents
Rev B TABLE OF CONTENTS SRX_400 TELEMETRY RECEIVER ......................1 USER'S MANUAL VERSION 4.XX ......................1 INTRODUCTION ......................3 SRX_400 FUNCTION GUIDE..................4 Power Supply and Accessories .....................4 Maintenance and storage......................6 Lightning protection ........................6 Memory............................6 Start-up and the Command Environment..................6 PROM initialization........................7 The Keys and their Functions.......................7 SHIFT.................................. -
Page 3: Introduction
Rev B INTRODUCTION The SRX_400 is a data logging, tracking and telecommunicating receiver designed for a wide range of applications. All of its internal functions are controlled by a dedicated microcomputer with 64k bytes of program memory (EPROM) and 64K bytes of data memory (non-volatile static RAM). -
Page 4: Srx_400 Function Guide
Rev B SRX_400 FUNCTION GUIDE Power Supply and Accessories - RF jack for antenna connection (whip antenna, ASP_8 connection) - Battery charger connection - Headphones connection OFF/VOL - On/Off switch, volume control knob POWER - External DC power cable connection ASP_8 - ASP_8 antenna switching unit connection - 15 pin SERIAL I - serial port used for RS232 communications (dumps, terminal control, DSP) - 9 pin... - Page 5 Rev B SRX_400 receivers produced after April 1994 (look for an “A” in the serial number) are equipped with a new power management system which provides true "fast-charging” of batteries, independence of charge and external power functions and a bicolor charge status indicator.
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Page 6: Maintenance And Storage
Rev B port ( ), to accommodate special applications (e.g., GPS or DSP_500 interfaces). A 15-pin PORT 2 (DE-15P) connector is also provided for antenna switching using Lotek’s ASP_8 controller. See the figures above for locations of front and rear panel connectors. Maintenance and storage The SRX_400 should be protected from dust and moisture. -
Page 7: Prom Initialization
Rev B new environment (e.g., frequency scan or signal measurement) in which keys may be reassigned and functions redefined. Navigation is guided by interactive menus and the ape key. PROM initialization Operating system software is contained in one (SRX_400 ‘A’ models) or two (earlier models) programmable read only memories (PROMs). -
Page 8: Set F
Rev B ENTER GAIN (00-99) > or, in versions supporting individual antenna or channel gains, MASTER GAIN (XX) > (where XX is the current value) and then waits until it receives two numeric inputs from the keypad. Shifted or non-numeric keys (except ) are ignored. -
Page 9: Set
Rev B SET ∆ key is the general "return" operator. Most commonly it returns you to the main program, restoring the command display on line one. Sometimes it provides a return from a subprogram to the menu from which it was called. Sometimes it is used to terminate data entry (of lists or table values) from the keyboard. -
Page 10: Signal
Rev B The Range function requests a beginning and ending frequency for the search and then scans this range. This function may be used to find the frequency of an unknown transmitter or to check for the presence of any of a known group of signals. The Neighbourhood function searches a range of frequencies from 8KHz below to 8KHz above the current selected frequency. -
Page 11: Scan
Rev B assigns the arrow keys to increment/decrement frequency and SHIFT + SET F SHIFT + SET G gain. The delta status position (see Figure 1) shows an "F" or a "G". (without ) toggles audio noise blanking (a new function available in SRX_400 ‘A’ SHIFT receivers) which uses the automatic signal detection features of the SRX_400 to enhance audio performance, especially in aircraft or other high-noise environments. - Page 12 Rev B /Interval routine (see above). When the signal measurement option is turned off, the SIGNAL signal strobe character (signal status position) is replaced by a small square. The SHIFT + SIGNAL key sequence also assigns the arrow keys to the job of closing ( ) and opening DOWNARROW ) the pulse interval window, and...
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Page 13: Ftable
Rev B SHIFT + CODE Digital code recognition Toggle audio noise blanking SHIFT + F2 Scratchpad FTABLE key accesses five functions. The menu is: FTABLE 1)ADD 2)DELETE 3)COPY 4)PARTITION 5)SIZE Partition allows you to select one of sixteen separate tables (numbered 00 to 15) as the "active partition". -
Page 14: Time
Rev B Because one or more partitions are specified for each frequency, the file is essentially a master list (all frequencies, all partitions). Once it has been sent to the receiver it may be modified by adding or deleting frequencies as described above, but when a new table is uploaded it will completely replace the existing one. -
Page 15: Code
Rev B Baud = baud rate from 110 to 19,200 Parity = odd, even, or no parity Format = number of data bits (7 or 8) and stop bits (1 or 2) Flow = XON/XOFF or other flow control protocol (version dependent) Interchar (Delay) = intercharacter delay, to allow interfacing with slow peripheral devices. -
Page 16: F0- F3
Rev B feature with caution! In software versions which support coded transmitters, the CODE also allows code set selection from the command environment and controls the code discrimination option in routines. SCAN SIGNAL Finally, the key is used to set I.D. codes for identification of records from individual CODE receivers in automatic data logging situations F0- F3... -
Page 17: Srx_400 Operations And Exercises
Rev B SRX_400 OPERATIONS AND EXERCISES Preface to the Examples The following exercises are designed to enhance familiarity with SRX_400 functions and operating modes . They are modeled as faithfully as possible on real applications and include a basic radio tracking session, an optimization procedure and an automatic monitoring system installation. - Page 18 Rev B other frequencies, review the frequencies you have just entered (using the delete option), or press to leave the menu of . If you run into trouble, press the key repeatedly FTABLE until you are back to the main menu (frequency and gain display), and then start over.
- Page 19 Rev B If a signal is present, the bottom line of the display will show the pulse interval (repetition period) in milliseconds, relative signal strength and two status characters. These are an expanding "strobe" which follows the signal pulses and a letter (G or F) which gives the status of the arrow keys (control of gain or frequency).
- Page 20 Rev B AVAILABLE MEMORY 49746 1)INITIALIZE 2)CONTINUE The available memory belongs to the scratchpad, and the reported size will vary depending on the software version and on the current status of memory use by other programs. Initializing the scratchpad will erase current scratchpad data only. If you choose to continue, new scratchpad data will be appended to the existing record.
- Page 21 Rev B ENTER FIELD COORDINATES > then enter two numbers, up to nine digits each, terminating each one with the key. If you make an error, you can use the key to delete it. UPARROW DOWNARROW After entering latitude/longitude values in the scratchpad, you are no longer interested in the transmitter you have identified, and you would rather do without the overhead of continuing to look for it.
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Page 22: Example 2: Optimization
Rev B from your computer keyboard. HOST wakes up ready to receive data. Now from the SRX_400 command environment press SHIFT F0 Depending on the particular software version you are using you will either see the Dump menu immediately or you will be given the option of selecting it. From the Dump menu, select the Pad option. -
Page 23: Adaptive Gain Control
Rev B subject to similar constraints! Thus the first line of defense against noise is to reduce the receiver gain. Some forms of noise are naturally "bursty", like mobile voiceband messages or satellite transmissions. Here the best remedy is for the receiver to attempt to reject signals with inappropriate time "signatures". -
Page 24: Optimizing Noise Performance In Event_Log
Rev B the display. Event_Log, running in frequency priority mode, only scans the auxiliary antennas when a valid signal is detected on the associated master, so the presence or absence of entries for A1, A2, A4 and A5 signify the success or failure of the program to acquire signals on M0 and M1. - Page 25 Rev B (A Sample Session) This is a transcript of a real experiment. Four transmitters were used, having the following characteristics: Frequency Period (rate) Repetition Code Interval 151.450 936ms (64bpm) N.A. 151.138 622ms (96bpm) N.A. 151.149 973ms 2 pulses at 348ms 151.158 1106ms 3 pulses at 339 ms...
- Page 26 Rev B Here the system response is slower, and detectability of repetition coded transmitters (with their obligatory longer group size) is especially poor. What is happening is that so many noise events are being interpreted as impulses (i.e., ignored) that the local gain reduction algorithm has failed to reduce the gain sufficiently to clear away the other (non-impulsive) noise components.
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Page 27: Example 3: Automated Data Collection
Rev B after settling. Using a global noise threshold of 2, the gain settled to the desired value of 56, with the following result: 10/11/89 15:40:08 151.450*64*110 151.138*96*97 151.149*2R*188 151.158*3R*109 10/11/89 15:41:09 151.450*64*92 151.138*96*91 151.149*2R*194 151.158*3R*140 10/11/89 15:42:01 151.450*64*90 151.138*96*113 151.149*2R*195 10/11/89 15:43:02 151.138*94*86 151.149*2R*195 10/11/89... -
Page 28: Remote Operation By Telephone
Rev B to set up telephone links from the dam sites, where the density of data will be highest, and public phone lines are available. Each receiver will have its own modem and its own dedicated line and will operate in "auto-answer" mode, so that you may call it at any time from your computer and observe real-time performance, modify system parameters or download data. -
Page 29: Appendix A: Rs232 Port Connector And Null Modem Cable
Rev B APPENDIX A: RS232 Port Connector and Null Modem Cable Receiver Back Panel Terminal or Computer Connector (DE-9P) Serial Port (DB-25P) NAME NAME... -
Page 30: Appendix B: Antenna Switch Control Port
Rev B APPENDIX B: Antenna Switch Control Port Pins 1-8 : ASP_8 current switch or 5V active high logic levels A7 A6 A5 A4 A0 A1 A2 A3 (1) o o (8) (9) o o (15) Pins 9-15 are at logic ground... -
Page 31: Appendix C: Prom Installation And Initialization
Rev B APPENDIX C: PROM Installation and Initialization The instructions described below are for reference purposes only and are not intended as a general recommendation or endorsement by the manufacturer for independent firmware installation by the user. To avoid the potential for degrading receiver performance or of inadvertent receiver damage, it is recommended that any firmware installation be performed by the manufacturer 1. - Page 32 Rev B synthesizer count value recorded on the label. If the synthesizer count values do not match then perform the remainder of this procedure up to step 14 then repeat this procedure beginning at step 6. In the event that the values still do not match contact LOTEK Engineering Inc.
- Page 33 Rev B recorded on the label there are two possibilities for the discrepancy. The greatest possibility is that the ‘new PROM’ routine data has not been entered correctly. There is also a small possibility that there is an electrical fault in the receiver. The actual receiver frequency will differ from the selected frequency if the synthesizer count value is not correct.
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Page 34: Appendix D: Additional Information
Rev B Appendix D: Additional Information This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. -
Page 35: Index
Rev B INDEX active antenna, 16 in SCAN and SIGNAL routines, 12 adaptive gain control, 22, 23 local maximum in SEARCH function, 9 FTABLE function, 13 memory, 3, 5, 6, 7, 9, 12, 13, 15, 20 antenna, 5, 6, 8, 16, 22, 25, 27 extended, 6 antenna switching, 6, 16, 27, 30 memory effects... - Page 36 Rev B terminal mode, 15, 28 window time for pulse interval, 7, 10, 11, 12, 19, 20, 22, 23 time and date function, 14 XON/XOFF, 15 typographic conventions, 3...