FSO - PMR radio station

System descriptionRadio systems

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General

For the use in networks of the private land mobile radio service three new base station radios have been developed:

- FSO 408 for VHF 4m-band

- FSO 416 for VHF 2m-band

- FSO 545 for UHF-band

These base station radios provide outstanding ra-dio frequency characteristics. They are compact, designed for ease of maintenance and suitable for application in a wide range of different radio networks.

Capability chracteristics

- compact and modular construction with a design offering easy maintenance

- outstanding technical data for transmitter and receiver (see technical data)

- unlimited application in simulcast networks by use of oven-controlled oscillator

- operating mode: duplex, semiduplex or simplex, repeater mode

Radio station FSO-PMR

- transmitter power adjustable from 1 to 25W /25W via handlheld service device

- continous transmission at maximum transmitter power

- digital remote control for data transfer to a suitable central office

- tone call encoder / decoder

- modulation-input for data transmission

- selftest function and transfer of failure reports to the central office

- transfer of control commands to the radio station e.g. channel remote circuit

- control-circuit for constant transmitter power over the entire temperature and frequency range at the output of the duplexer

- menue guided adjustment of all required parameters via handheld service device

- various service functions for easy setup and test of the radio base station

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Transmitter

The transmitter module works with a central supply voltage of DC 13.5 V.

Both subassemblies - Transmitter exiter and Trans-mitter amplifier - are placed in a RF-shielded cabi-net and decoupled from each other by an isolation panel so no interference can get outside.

The transmitter amplifier provides an output power of up to 30W to an “N“type coaxial connector on the front panel. Thereby a maximal adjustable output power of 25W at the antenna output is provided, despite of losses in directional coupler, filter and combiner.

Due to a continous variance analysis the transmit-ter power at the output of the combiner is constant over the whole frequency and temperature range.

A temperature sensor in the amplifier causes a power reduction from appr. 80°C heatsink tem-perature.

Receiver

The receiver module works with a central supply voltage of 13.5 V DC.

The receiver is placed in an electromagnetic RF-shielded cabinet.

It´s RF-input is led over a coaxial connector of “N“type on the front panel and is also connected to the antenna combiner resp. antenna switch.

Reference module

According to the respective application, four differ-ent reference modules are available:

- reference modules for simulcast operation VHF or UHF - reference modules without simulcast operation VHF or UHF

In simulcast operation for the adequate high frequency stability, an oven-controlled oscillator (OCXO) is implemented.

Design

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FSO PMR radio station

Digital controllerThis assembly controls the fixed station FSO and contains the following functional modules:

- Microprocessor with data storage- tone frequency generator- three busmodules for the system integrated bus control- two busmodules for external data exchange- power supply with voltage reset- parallel control interface for input and output

On the front plate a 15-pole Submin D-connector plate is available. It is connected to the handset UBt. Via this handset device, conversations via radio resp. wire are possible and code- and testfunctions can be invoked.

Analog controllerThis assembly controlls analogue signals (AF-connections) of the fixed stations FSO:

- AF from receiver, AF to transmitter- Data-AF (FSK) to/from data modem- AF of the tone generator- AF of the service handheld device

Each of these signals is switchable both in direc-tion „wire“ and „radio“ .

Switching a wire- resp. radio loop (RS1) is pos-sible. The actual condition of the radio station is displayed.

FSO 408/416

FSO 545

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DFS-modul (optional)The DFS modul (digital remote control) extends the 3 existing command- and report functions of the controller by additional 5 more digital commands and reports.

Important operating conditions of the DFS are shown on a LED-display field.

A button exists for the manual check of the lines to the central office.

Extra plug-in units

For adding devices several slots are available beside the analog controller.

For the use of a diversity control unit UeDi-L (to sup-port multiple receiver locations on a channel):

- receiver-card modul EKMS

- transmitter-card modul SKMS

for a remote simulcast base station connected via a four-wire cable:

- four wire unit VDAS

Service handset

Handling and programming of the radio station is done by the extra easy-to-handle and comfortable via the service handset UBt.

Besides the switching functions necessary for the operation circuit, all specific service functions like code- and testing functions are available. The dis-play of all important data takes place via an alpha numeric display, status display and a series of LEDs for radio field power.

Duplexer

For DUPLEX made of operation, a separate antenna combiner assembly is placed above the transmitter-receiver unit in the cabinet.

For base stations which support both simplex and duplex/semi-duplex mode, a switchable antenna combiner version is used.

In the antenna combiner assembly an evaluation of antenna matching is done by directional coupler measurement and forward and return power are displayed.

It is dimensioned for up to 50W and connected to the transmitter, receiver and the antenna via three connectors (type N) on the front panel.

FSO PMR radio station

Radio base stations installed in a cabinet Voltage control of the cabinets

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General: VHF (4m): FSO 408 VHF (2m): FSO 416 UHF: FSO 545BZT-approval A116094E A119632F Frequenzbereich 68 ... 87.5 MHz 146 ... 174 MHz 403 ... 470 MHzDuplex spacing adjustable to specification

No. of channels 32 duplex pairsChannel spacing 12.5 kHz, 20 kHz, 25 kHzRF-circuit switch bandwidth 2 MHz (< 1 MHz with antenna combiner)Type of modulation PM, FMOperating mode simplex, semiduplex, duplexFrequency generation PLL-Oscillator for RX, admix method with PLL-Oscillator and VCXO for TXFrequency programming with micro processorPower supply; internal DC 13.5 V Temperature range within limits of datasheet: -25 °C to +55 °C, operation: -30 °C to +60 °C Dimensions (H x B x T) 760 mm x 600 mm x 350 mm Transmitter:Transmitter power VHF adjustable from 1 to 25 W (FSO 408/416) UHF adjustable from 1 to 25 W (FSO 545)Stability of the adjusted RF-power better than + 0,5 dB above frequency and temperatureDeviation stability better than + 0,5 dB above frequency and temperatureTransmitter key time < 5 ms (TX direct) für 90 % RF-efficiencyAF-level (Mod.-input) 86 mVeff for nom. deviation = 60 % max. deviation und fmod = 1 kHz Distortion at nom. deviation < 3 %AF-level(data input) 857 mVSS for nominal stroke= 60 % max. HubTransmitter residual deviation (not modulated) < 20 HzModulation S/N (filtered) > 53 dB referred to nominal deviationAF-frequency response 50 to 3000 Hz at +1/-3 dBData input during speech and tone prevented via Software Modulation input during data transmission prevented via Software simplex/duplex-switchover via software

Technical specifications

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Receiver:

Sensitivity: PM: < 0.5 µV / FM: < 0.7 µV (on 50 Ohm at 20 dB SINAD, filtered)AF output level 664 mVeff an 2.7 k Ohms (unfiltered at discriminator)NF-recieve-output level 664 mVeff at 2.7 k Ohms at nominal deviation and fmod = 1 kHzDistortion at nominal deviation < 7 %Radio signal strength output (RSSI) (Ri < 100 Ohm) 0 to 5 V (without delay)Squelch Threshhold 13 to 26 dB S/N (hysteresis < 3 dB) rise-time < 2 ms, fall-time < 10 ms Highpass 250 Hz switchable

Reference oscillator:

FSO FSO 408 / 416 FSO 545Frequency 6.400 000 MHz 16.800 000 MHzFrequency stability (standard) < + 1 ppm < + 1 ppmSimulcast < + 0,05 ppm / jear < + 0,05 ppm / jear

Technical specifications

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