CalAmp Wireless Networks GPDA Gemini/PD User Manual service manual preliminary version

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Document ID	17435
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Document Description	service manual preliminary version
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
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Filesize	3.56kB (44486 bits)
Date Submitted	1998-12-23 00:00:00
Date Available	1999-03-09 00:00:00
Creation Date	2001-07-10 08:51:11
Producing Software	Acrobat Distiller 4.0 for Windows
Document Lastmod	2001-07-10 08:51:12
Document Title	service manual preliminary version

Gemini / PD
Mobile Radio Modem
Service Manual
version 0.03
PRELIMINARY
The entire contents of this manual and the Radio Service Software
described in this manual are copyright 1998 by DATARADIO Inc.
Copyright DATARADIO Inc.
November 1998
part no.: 120 1020110-003
Table of Contents
1.
PRODUCT OVERVIEW................................................................................................................................... 1
1.1 INTENDED AUDIENCE ....................................................................................................................................... 1
1.2 GENERAL DESCRIPTION .................................................................................................................................... 1
1.3 CONFIGURATION ............................................................................................................................................... 1
1.4 FACTORY TECHNICAL SUPPORT ........................................................................................................................ 2
1.5 PRODUCT WARRANTY ...................................................................................................................................... 2
1.6 REPLACEMENT PARTS....................................................................................................................................... 2
1.6.1 Factory Repair ........................................................................................................................................ 2
2.
OPERATION...................................................................................................................................................... 2
2.1 FRONT & REAR PANELS ................................................................................................................................... 2
2.1.1 LED Indicators........................................................................................................................................ 3
2.2 DTE PORT INTERFACE ..................................................................................................................................... 3
2.2.1 RS-232 Interface Signal Levels ............................................................................................................... 3
3.
ADJUSTMENTS AND MAINTENANCE ....................................................................................................... 4
3.1 OVERVIEW ........................................................................................................................................................ 4
3.1 INTENDED AUDIENCE ....................................................................................................................................... 4
3.2 EQUIPMENT REQUIRED ..................................................................................................................................... 4
3.3 MAINTENANCE INTERVALS ............................................................................................................................... 4
3.4 TESTS & ADJUSTMENTS ................................................................................................................................... 4
3.4.1 Preliminary Verification ......................................................................................................................... 4
3.4.2 Basic Tests & adjustments....................................................................................................................... 4
3.4.3 Tests & adjustments Procedure............................................................................................................... 4
3.4.4 Opening the Unit..................................................................................................................................... 6
3.4.5 GPS Diagnostics Procedure.................................................................................................................... 7
4.
SPECIFICATIONS ............................................................................................................................................ 8
What's New in Version 0.02
GPS Diagnostics procedure
History
Version 0.1: First preliminary version
Version 0.2:
•
Unit specification revised
•
Typo correction
ii
Definitions
The following terms are used throughout this document.
Item
DCE
DTE
GCU
Gemini/PD
HDX
RS-232
RSS
Simplex
Definition
Data Communications Equipment. This designation defines the direction (input
or output) of the various RS-232C interface signals. Modems are always wired as
DCE. See also DTE.
Data Terminal Equipment. This designation defines the direction (input or output) of the various RS-232C interface signals. Most user equipment, as well as
PCs, are wired as DTE. See also DCE.
Gemini Control Unit board
High specs mobile radio modem. PD = Parallel decode
Half Duplex. A unit which uses separate transmit and receive frequencies, but
which may not transmit and receive simultaneously.
Industry–standard interface for low speed data transfer (EIA-RS-232E).
Radio Service Software. This software allows configuration and testing of the
Gemini/PD.
A unit which uses the same frequency for transmit and receive.
iii
Features:
• Rugged water-proof die-cast aluminum
chassis.
• Data speeds of 9600 to 19200 b/s
(9600 b/s maximum in half channels)
• 3 available user ports using standard
RS-232 interface
• Built–in 16-channel synthesized radio
transceiver.
• Power output of 10W to 40W (software
controlled).
• Half duplex or simplex operation.
1. PRODUCT OVERVIEW
This document provides the information
required for the operation and maintenance
of the DATARADIO Gemini/PD mobile radiomodem.
1.1
Intended Audience
This document is designed for use by engineering design, installation, and maintenance personnel.
1.2
1.3
General Description
Configuration
Operating characteristics of the Gemini/PD
are configured by Dataradio System
Engineering for communication protocols
and network settings.
Gemini/PD is a mobile radio-modem aimed
at the public safety and public utility markets
to meet demand for high speed and high
throughput. It integrates all the necessary
hardware for data-only vehicular installations
up to but not including the laptop PC and its
application software. Example of
applications are:
A Radio Service Software (RSS) is provided
for radio/modem maintenance, adjustments
and frequency programming. The RSS is
MSDOS based and will run on any 486 or
higher PC (2 Megabytes memory required).
1. Database inquiry systems.
Small number of brief messages, (usually from the mobile station) with fairly
long responses.
WARNING: The frequency band 406 to
406.1 MHz is reserved for use by distress
beacons and cannot not be programmed into
the unit.
2. Computer-aided dispatch (CAD).
Large number of messages, (usually
from the base station) with very brief
responses.
3. Automatic Vehicle Location (AVL).
Using a GPS receiver, determines position, speed and direction of fleet members.
The Gemini/PD is made-up of a main
transceiver and a auxiliary receiver for
Parallel Decode (PD), a 40 Watt power
amplifier, a Gemini Control Unit (GCU) with
DSP driven modem and an integrated OEM
GPS receiver.
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1.4
gest a solution eliminating the need to return
equipment.
Factory Technical
Support
The Technical Support departments of
DATARADIO provide customer assistance on
technical problems and serve as an interface
with factory repair facilities. They can be
reached in the following ways:
1.6.1 Factory Repair
When returning equipment for repair, you
must request an RMA (Returned Material
Authorization) number. The Tech Support
representative will ask you several questions
to clearly identify the problem. Please give
the representative the name of a contact person who is familiar with the problem,
should questions arise during servicing of
the unit.
DATARADIO Inc.
5500 Royalmount Ave, suite 200
Town of Mount Royal
Quebec, Canada H4P 1H7
Technical support hours: Monday to Friday
9:00 AM to 5:00 PM, Eastern Time
Customers are responsible for shipping
charges for returned units. Units in warranty
will be repaired free of charge unless there
is evidence of abuse or damage beyond the
terms of the warranty. Units out of warranty
will be subject to service charges. Information about these charges is available from
Technical Support.
phone: +1 514 737-0020
fax:
+1 514 737-7883
or
DATARADIO Corp.
6160 Peachtree Dunwoody RD., suite C-200
Atlanta, Georgia 30328
2. Operation
Technical support hours: Monday to Friday
9:00 AM to 5:00 PM, Eastern Time
2.1
phone: 1 770 392-0002
fax:
1 770 392-9199
The front panel includes:
or
Email address: support@dataradio.com
1.5
Product Warranty
Warranty information may be obtained by
contacting your sales representative.
1.6
Front & Rear Panels
•
One mini-UHF type female antenna
connector for the auxiliary receiver
•
One SMA type female connector for the
GPS receiver
•
Two LED indicators
•
Three DE-9F RS232 ports
The rear panel includes:
Replacement Parts
This product is normally not field serviceable, except by the replacement of complete
units. Specialized equipment and training is
required to repair the GCU board and radio
modules.
•
One mini-UHF type female antenna
connector for the main transceiver
•
One 3-pin pigtailed power connector
with ignition sense
Contact Technical Support for service information before returning equipment. A
Technical Support representative may sug-
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We recommend the use of a shielded 9-wire
cable with all pins connected. These ports
can be used for unit configuration, maintenance & adjustment as well to connect user
applications.
2.1.1 LED Indicators
The Gemini/PD has two LED indicators:
LED’s
name
PWR
RX/TX
Indicates
Description
red
DC Power is applied
red
Unit transmit
green
Unit receive
flashing
red/green
2.2.1 RS-232 Interface Signal
Levels
In the descriptions of data signals, the following conventions are used:
Radio is unlocked
Table 1 - RS-232 Signal Levels
2.2
DTE Port Interface
For all three ports:
DE-9 F
pin #
Term
Alternates
Signal level
ON
asserted, spacing
+3 to +15 V
OFF
dropped, marking
-3 to -15 V
Function
DCD – from Gemini/PD, normally
asserted
RXD – data from Gemini/PD
TXD – data to Gemini/PD
DTR – to Gemini/PD, handshaking
Ground
DSR – from Gemini/PD, tied to
VCC through current limiting resistor
RTS - to Gemini/PD, handshaking
CTS – from Gemini/PD, handshaking
AUX auxiliary input to Gemini/PD,
“panic line” input (port 3):
It may be activated by dry contact
pull-up to the port’s DSR output. It
may also tolerate user pull-up to
external +12 VDC (car battery), but
an isolated dry contact is preferred
due to the risk of noise related false
alarms caused by the vehicle’s
electrical system.
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3.4
3. Adjustments and
Maintenance
1.1
3.4.1 Preliminary Verification
Before performing any adjustment, verify the performance of the unit as shown in the Table 1.
Overview
This chapter outlines the basic adjustment procedures required upon initial installation and
thereafter at prescribed maintenance intervals.
Units are delivered from the factory properly
aligned and tested on the frequencies specified
at time of order. Adjustment beyond that described in this chapter is not required unless radio modules have been tampered with or repaired. In such cases we recommend complete
factory re-alignment as special test jigs are required.
3.1
Important note: Before proceeding make sure that
the service monitor has been calibrated recently and
has warmed up for at least the time specified by its
manufacturer.
Some reported frequency and deviation problems
have actually been erroneous indications from service monitors that have not adequately warmed up.
This is particularly likely when field service is done
during winter months.
3.4.2 Basic Tests & adjustments
Recommended Tests:
1. TX power output
2. Carrier frequency error
3. Frequency deviation
Note: Only if a loss in system performance has
been detected, RX SINAD and RX audio
distortion should be verified.
Adjustments:
1. Transmitter power output
2. Frequency error
3. Transmitter deviation
Intended Audience
This chapter is intended for use by installation
and maintenance personnel.
3.2
Equipment Required
The adjustments described below require the
following equipment:
•
•
•
•
•
•
13.6 VDC (nominal), 20A regulated power
supply.
Radio service monitor (IFR or equivalent).
Cable with mini-UHF male connector to
connect Gemini/PD to the service monitor.
Gemini Radio Service Software,
A 486 PC (or better) to run the RSS.
Normal radio shop tools.
3.3
3.4.3 Tests & adjustments Procedure
Refer to the RSS help file for details &
parameter information.
1. Connect the Gemini/PD main antenna connector (or the auxiliary receiver) to the
TX/RX input of the service monitor using a
suitable length of 50 ohm cable.
2. Connect the Gemini/PD to a suitable power
supply and adjust the supply voltage to 13.6
volts.
3. Using a suitable 9 conductor straight RS232 cable, connect the Gemini port 1 to the
RS-232 port of a PC and run the Gemini
RSS program.
4. Press GET to get the configuration of the
unit.
5. Refer to “Tests and Adjustments” table.
Maintenance Intervals
The adjustments described below should be
done at annual intervals or whenever a deterioration in performance indicates that adjustment
may be required.
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Tests & Adjustments
Gemini/PD Technical Manual
Table 1: Tests and Adjustments Full & Half ChannelUnits
STEP
ACTION
EXPECTED
RESULTS at
25°°C
Output Power
UHF: 40 watts 1
Press PTT Channel x
+10%, -20%
Frequency Error
±300 Hz
MEASURE
WITH
IF NOT?
Service monitor
set to read power
Check the RSS maximum power
output setting: must be set to 255
(means 40W). User can however
reduced it down to 10 Watts.
Refer to factory tech support.
Service monitor
set to read frequency error
Press PTT Channel x
Adjust using the RSS Freq Warp
setting (fine tuning adjust)
(Typical adjust range is ±1.5KHz)
If found outside limits, user is
to call factory technical support.
Deviation
Press PTT Channel x
Carrier will be modulated
with a 1 KHz tone.
For any bit rate
speeds selected:
Service monitor
set to read
deviation
Full channel unit
Using RSS, adjust TX deviation.
±4.0 kHz
+5%, -10%
Half channel unit
±2.5 kHz
+5%, -10%
Set the service monitor to generate a –80 dBm signal on the selected receive frequency. The signal should
be modulated with a 1.0 kHz tone. Open the top cover to access the radio (see 3.4.4)
To be performed only if a loss in system performance has been detected
12 dB SINAD
• For Full channel unit, set
deviation to ±3 kHz.
• For Half channel unit, set
deviation to ±1.5 KHz
Measure taken at
J400 pin 21 (RX1)
and at pin 23
(RX2)
≤ 0.5 µV 2
Service monitor
set for SINAD.
Connect to radio
connector J400
pin 21 (RX1) or
pin 23 (RX2).
Refer to factory technical support.
Same as per
Step 5
Refer to factory technical support.
• Set service monitor IF
filter to mid (15-30 kHz),
no audio filter.
Distortion
Use same settings as per 12
dB SINAD
< 3%
1 (unless you have set a lower value). Note that readings less than 40 watts may be due to losses in cables used for testing.
Check also your wattmeter frequency calibration curve. Do not be too ready to condemn the transmitter.
2 If a psophometrically weighted filter is available on the service monitor, use 0.35 µV.
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3.4.4 Opening the Unit
1. Remove the two Philips screw from the unit top cover.
2. Remove the top cover by lifting it from the rear.
3. Slide the cover out of the case.
Figure 1 Gemini/PD Top view (cover removed)
13.6Vdc Power connector
Main Antenna connector
23
24
J400
Aux. Receiver Antenna connector
GPS Receiver antenna connector
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RS232 com ports
Gemini/PD Technical Manual
3.4.5 GPS Diagnostics Procedure
OVERVIEW
The detection of the POSition message shows a GPS CONNECTED LED. After about three
minutes, detection of the one Pulse Per Second (PPS) should flash the POSITION ACQUIRED
indicator, this means that the GPS has a position solution.
If the GPS has a good view of the sky and still has not generated any position solution within
three minutes (it may take up to 10 minutes or more if the sky view is partially blocked.) the
following trouble-shooting procedures should be undertaken to isolate the fault:
1) Disconnect the GPS antenna cable connector from the Gemini radio and check for + 5 VDC
on the center pin of the GPS antenna connector on the radio using a DVM. If the voltage is
present, do not reconnect the cable and proceed to step 2.
2) With the DVM, measure resistance between the shell and the center conductor of the GPS cable, resistance should be between 100 and 300 Ohms, if it measures open or short circuit the
GPS antenna is either a passive antenna which is the WRONG type, or a defective active antenna, replace with a known good active antenna.
3) Connect the new antenna to Gemini and wait about three minutes for the POSITION
ACQUIRED indicator to start flashing on Gemini, if not, the Gemini radio or its GPS receiver
is defective.
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4. Specifications
GENERAL
Frequency
Channel spacing
Frequency Control
Frequency Stability
Operating temperature
Modes of Operation
Number of channels
Supply voltage
Circuit Protection
RX Current at 13.6 VDC
TX Current at 13.6 VDC
UHF
400 - 512 MHz
12.5, 20 or 25 kHz
Digital Synthesizer / uController
1.5 ppm
-30°C to +60°C (25°C nominal) @ 95% non-cond. RH
Simplex or Half Duplex
16 internally stored
13.6Vdc nominal (negative ground)
10.9 – 16.3 VDC
15 Amp fuse external
2 & 4 Amp fuse internal
< 550 mA Standby (with auxiliary receiver)
TX/RX separation
Nominal Dimensions
Weight:
RF input/output Impedance
RF connector
Interface connector
< 15 A
5 MHz typical
7.050” D x 6.000” W x 2.0000” H
< 3.5 lbs.
50 ohms nominal
Main TX/RX: mini-UHF female
Auxiliary RX: mini-UHF female
GPS RX: SMA female
3x DE-9F D-subminiature
RECEIVER
UHF
Sensitivity (12 dB SINAD)
< 0.35 µV *
Selectivity (25KHz)
75 dB typical
70 dB minimum
Selectivity (12.5)
65 dB typical
60 dB minimum
Intermodulation
75 dB typical
70 dB minimum
Spurious rejection
75 dB typical
70 dB minimum
FM hum & noise
-45 dB typical *
< -57 dBm
Conducted spurious
* psophometrically weighted filter
WARNING:
The frequency band 406 to 406.1 MHz is reserved for use by distress beacons
and should not be programmed into the unit.
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TRANSMITTER
UHF
Power output
10-40 watts
Duty cycle
20% @ full power, 30 seconds maximum transmit time
Conducted Spurious
Frequency stability
-75 dBc (-38 dBm @10 W) typical
1.5 ppm
FM hum and noise
Attack time
MODEM OPERATION
Interface
Operation
Data rates
Modulation type
Packet Error Rate
(for < 1% error)
-45 dB max (25 kHz)
< 10 ms
Protocol
EIA RS-232C
Simplex/half duplex
4800 b/s
DRCMSK
better than –110 dBm
better than –115 dBm
better than –112 dBm
better than –109 dBm
Dataradio Proprietary
DISPLAY and CONTROLS
2 status LEDs
RX/TX, PWR
9600 b/s
DRCMSK
at 9600 b/s half channel
at 9600 b/s full channel
at 16000 b/s full channel
at 19200 b/s full channel
19200 b/s
DRCMSK
FCC / IC
CERTIFICATIONS
FCC
IC (DOC)
VHF
UHF
900 MHz
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120 10503-201
ii
T-96S Technical Manual

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