The VS 2001 UHF Vehicle Radio Equipment is a digital vehicular radio terminal designed in compliance with the TETRA standard. It operates in a frequency band that depends on the specific version (VS 2001-400, VS 2001-430, VS 2001-470). This transceiver is frequency synthesized and controlled by a microprocessor, designed for both voice and data reception/transmission within the TETRA communication system.
Function Description:
The equipment consists of two main modules: the Radio Unit transceiver and the FPG1/A Front Panel.
The Radio Unit is housed in a single piece, die-cast aluminum container with a finned surface (heat-sink) for heat dissipation. Internally, it is divided into three compartments: a large one for the Base Band card and two smaller ones for the R/T card and P.A. card.
The Base Band card processes the base band signal during both transmission and reception phases. It hosts processing units such as the DSP (Digital Signal Processor) and a microcontroller. Key functional blocks include I/F Audio, Microcontroller and Memories, DSP & RAM, Asic Time Base, and an RS232 interface & Level Translator circuit. The microcontroller manages all network digital processes and internal activities, including TETRA protocol management (Upper MAC to Mobility Management and Call Control), DTE management, interface management with Lower MAC firmware on DSP, terminal identification, DSP operating program download, and R/T and P.A. analogue card functioning. It also supports multiple asynchronous serial lines for peripheral DTE and management terminal connections, with programmable baud rates up to 115200 bps. The DSP executes physical layer numerical processing algorithms for uplink and downlink, manages the TETRA protocol (Lower MAC), and interfaces with audio and radio sections.
The R/T card (Receiver/Transmitter card) translates signals from audio frequency to radio frequency (transmission) and vice versa (reception), and pre-amplifies signals. It operates in Trunking Mode with zero switching time (Rx/Tx) within the same frame, receiving and transmitting on adjacent slots. The R/T card contains tuneable RF heads, mixers for frequency conversion, intermediate frequency filters, circuits for base band reception, service circuits, frequency synthesizers (including a second one), power supply circuits (DC/DC converter), TX mixers, tuneable filters, amplifiers, phase-shifter circuits for modulating components, transmission modulators, and demodulation circuits with phase correction feedback.
The P.A. card (Power Amplifier card) amplifies the transmitted signal to the required power level, providing a power output of 40 dBm (10 W) in the vehicular radio operating frequency range. It uses a bipolar technology transistor driven by an LDMOS technology power module.
The FPG1/A Front Panel serves as the user interface, providing controls, audio accessory connectors, and an RS232 serial line. It contains three boards: a logic + display board, a keyboard board, and an interface board. The front panel features two rotary knobs for volume and group selection, and two LEDs indicating transmission and reception status.
An optional E-WHERE/FPG1/A Module (P/N 771-0940/01) can be installed for vehicle localization, especially when equipped with a GPS E-WHERE module. This module makes the PEI serial line available for PC connection on FPG1/A, avoiding conflicts with GPS equipment that also uses the PEI serial line by default.
Important Technical Specifications:
- Dimensions:
- VS 2001 Radio Unit: 202.4 x 186.4 x 58.4 mm
- FPG1/A Control Panel: 210 x 70.3 x 66.5 mm
- Electrical Characteristics:
- Air interface signaling: EN 300-392-2
- Power class: 2 (10 W)
- TX frequency band (Trunked Mode):
- VS 2001-400: (380-390) MHz
- VS 2001-430: (410-420) MHz
- VS 2001-470: (450-460) MHz
- RX frequency band (Trunked Mode):
- VS 2001-400: (390-400) MHz
- VS 2001-430: (420-430) MHz
- VS 2001-470: (460-470) MHz
- TX/RX frequency band (Direct Mode):
- VS 2001-400: (380-400) MHz
- VS 2001-430: (410-430) MHz
- VS 2001-470: (450-470) MHz or (445.2-445.3) MHz
- Automatic power control: Compliant EN 300 392-2
- Carrier spacing: 25 kHz
- Receiver class: EN 300 392-2 class A + B
- RF architecture: Half-duplex
- Audio power: 8 W, on 4 Ohm
- Supply source: Regulated Lead-Acid Battery
- Nominal supply voltage: Negative grounded: +13.8 VDC (Range: +10.8VDC to +15.6VDC)
- Power consumption (average on frame, 4 timeslots): Stand by: < 1.3 A, Receiving mode: < 3 A, Transmitting mode: < 8 A
- EMC specifications: EN 301 489-18
- Class: EN 60950 class II
- Installation category: IEC 664 class I
- Environmental Characteristics (Radio Unit module):
- Operative temperature: -20° to +55°C
- Storage temperature: -40° to +85°C
- Relative humidity: 10 to 95% at 50°C non condensing
- Protection to dust and water: IP54
- Shock and vibrations: ETS 300 019 1-5 IEC class 5M3
- Environmental Characteristics (Front Panel module):
- Operative temperature range: -20 to + 60°C
- Storage: -40 to + 85°C
- Relative humidity: 10 to 95% at 55°C
- Protection to dust: IP54
- Shock and vibrations: ETS 300 019 1-5 IEC class 5M3
- Transmitter Characteristics:
- Modulation: π/4 DQPSK
- Maximum power in antenna: 10W (Tetra Power Class 2)
- Receiver Characteristics:
- Sensitivity, Rejection of co-channel, Blocking characteristic, Rejection of spurious response, Rejection of inter-modulation response, Conducted emission undesired, Irradiated emission undesired: All in compliance with EN 300 392-2.
Usage Features:
The VS 2001 supports various operating modalities:
- Trunked Mode: Peripheral-Peripheral and Peripheral-Fixed connections via the network (Air Interface Protocol). Manages individual or group voice/data calls, with up to four simultaneous calls.
- Direct Mode: Direct Peripheral-Peripheral connection without network infrastructure, unless supported by a Gateway.
- Dual Watch Mode: Allows monitoring both trunked mode control channels and direct mode channels, enabling switching between modes when the radio is IDLE or a call is inactive.
- Voice and Data Transmission: Supports simultaneous voice and data with multi-slot services, allowing high-speed data transmission up to 28.8 kbit/s.
- Messaging: Transmission and reception of alphanumeric SDS (Short Data Message) messages via the Front Panel.
- PEI Management: Peripheral Equipment Interface, compliant with TETRA ETS 300 392-5 standard.
- User Interface: Alphanumeric keyboard with functional keys, including a dedicated emergency call button.
- Programming: Operating parameters are typically programmed using an external PC with a Programming Package (PRP) software, allowing configuration, personalization, and software/firmware downloads.
Maintenance Features:
The manual outlines procedures for preventive and corrective maintenance.
- Preventive Maintenance:
- Visual inspection and cleaning: Monthly checks of equipment condition, connectors (using deoxidizing spray if needed), external cables, upper cover, and antenna.
- Functional test: Monthly verification of keyboard and PTT button operation, and equipment functionality in all operating modes.
- Check of car battery system efficiency and assembly tightness: Monthly checks of equipment operation with the car engine off during transmission, power supply connector contacts (for oxidation), fuse efficiency, and tightness of all connectors and the transceiver bracket.
- Corrective Maintenance:
- Fuses replacement: Instructions for replacing the 16A fuse in the power supply cable.
- Frontal panel replacement: Procedures for replacing the FPG1/A control panel in both vehicle and motorcycle configurations.
- VS 2001 antenna replacement: Steps to unscrew and replace the antenna.
- VS 2001 radio equipment replacement: Instructions for disconnecting cables and removing the radio unit from its bracket.
- Troubleshooting: Flow diagrams are provided to diagnose failures based on symptoms, leading to corrective actions or referral to OTE assistance. Radio tests with a TETRA RADIO TEST SET are described for power and sensitivity verification.
Accessories:
The equipment supports various accessories:
- Microphone (MK1B): Frequency range 200-5000 Hz, sensitivity -71 dB ± 3 dB at 1 kHz, impedance 400 Ω ± 20% at 1 kHz, operating temperature -30 to +70 °C.
- Loudspeaker: Audio power 9 W, impedance 4 Ω.
- Antenna: Omnidirectional, connected via coaxial cable. Multiple models are available depending on configuration.
- Magnetic Hook Handset: High efficiency, magnetic support, IP54 water and dust protection, compliant with ETS 300 019-2-5 clas IEC 5M3 standard.
- Mechanical Hook Handset (MAM2000): Suitable for motorcycle configuration, IP54 water and dust protection.
- GPS Antenna: Compact, active, micropatch GPS antenna with magnetic mounting. Dimensions 50.5x42x13.8 mm, weight 115 g (without cable), power consumption 15 mA (max), operating environment -40° to +85° with high humidity.
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