ARAM Systems LDR220A Users Manual
LONG DISTANCE RADIO (LDR)
USER MANUAL
Version 0.002
Confidential
LONG DISTANCE RADIO USER MANUAL
Copyright Notice
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disclosed or otherwise provided to third parties.
This document is for informational and instructional purposes. ARAM Systems Ltd. reserves the right to make
changes in specifications and other information contained in this publication without prior notice, and the reader
should, in all cases, consult ARAM Systems Ltd. to determine whether any changes have been made.
The terms and conditions governing the sale and licensing of ARAM Systems Ltd. products are set forth in the
written contracts between ARAM Systems Ltd. and its customers. No representation or other affirmation of fact
contained in this publication shall be deemed to be a warranty or give rise to any liability of ARAM Systems Ltd.
whatsoever.
Disclaimer
ARAM Systems Ltd. makes no warranty of any kind with regard to this material, including but not limited to, the
implied warranties or merchantability and fitness for a particular purpose.
ARAM Systems Ltd. shall not be liable for any incidental, indirect, special, or consequential damages whatsoever,
(including but not limited to lost profits) arising out of or related to this publication or the information contained in
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Revision History
VERSION
0.000 March
0.001 October
0.002 October
DATE AUTHOR CHANGES
HH BEGIN DRAFT
31, 2008
HH
27, 2008
HH
29, 2008
Add a statement per FCC PART 15.19 and PART 15.21
Change page 12 all Operating Frequencies to Preset
Copyright © ARAM Systems Ltd., 2008
LONG DISTANCE RADIO USER MANUAL, V0.002
Specifications subject to change without notice
2
Confidential
LONG DISTANCE RADIO USER MANUAL
LONG DISTANCE RADIO (LDR) ..................................................................................................................1
USER MANUAL.............................................................................................................................................1
Version 0.002 ................................................................................................................................................1
1
2
3
4
5
6
7
OVERVIEW ............................................................................................................................4
HIGH LEVEL SYSTEM ARCHITECTURE .............................................................................4
LDR UNIT...............................................................................................................................5
3.1
CONNECTORS AND LED DISPLAYS ...................................................................5
3.2
STATUS LED..........................................................................................................5
3.3
RADIO STATUS LED .............................................................................................6
3.4
7-SEGMENT LED DISPLAY...................................................................................7
TYPICAL SETUPS .................................................................................................................8
ANTENNAS..........................................................................................................................10
FCC/INDUSTRY CANADA NOTICE ....................................................................................11
6.1
STATEMENT ACCORDING TO FCC PART 15.19 ..............................................11
6.2
STATEMENT ACCORDING TO FCC PART 15.21 ..............................................11
LDR SPECIFICATIONS .......................................................................................................11
Copyright © ARAM Systems Ltd., 2008
LONG DISTANCE RADIO USER MANUAL, V0.002
Specifications subject to change without notice
3
Confidential
LONG DISTANCE RADIO USER MANUAL
1 OVERVIEW
The purpose of this radio system is to provide a rugged VHF data link between various components of the ARAM
seismic data acquisition system. Emphasis is placed on the “Vibroseis” market, where mobile excitation source
equipment needs to be connected with the greater data acquisition network and the Central Recording Unit (CRU).
The actual seismic spread can cover over 100 square kilometers over many different types of terrain, making the
need for a long distance, (24km line of sight), radio that is very robust. Typically the vibrators operate in groups of 4,
and each vibrator generates about 125kbits/sec of information, making the overall payload bandwidth at least
500kbits/sec.
2 HIGH LEVEL SYSTEM ARCHITECTURE
An LDR takes on one or two possible roles: Master or Slave. On any one operating frequency there is only one
Master, and a configurable number of slaves. Masters are connected by the cabled ARAM network to the CRU
(Central Record Unit) while Slaves are connected into the greater system through the LDR RF link and the
Master.
The LDR will interface with ARAM’s “R-Lines” much like a RAM unit, unlike a RAM, however, the LDR will have a
third (RF) port. The LDR system will operate in a master/slave relationship (as opposed to a peer to peer
configuration). More than one slave is possible. Data flow is predominantly from the slave side to the master.
From a manufacturability standpoint, however, the master and slave units are to be physically identical. The LDR
system may be deployed in a “back-up-to-cable” role where the radio system does not operate unless cable(s)
develop impairments.
Copyright © ARAM Systems Ltd., 2008
LONG DISTANCE RADIO USER MANUAL, V0.002
Specifications subject to change without notice
4
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