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SE-235

Tactical radio system SE-235 or PR4G; manufactured by Thomson CSF.

To replace the SE-125 / SE-227 and SE-412 radios widely used in infantry units, which had already been deployed in the Vietnam War and were not yet able to offer modern features such as automatic frequency dialling and integrated voice encryption, work had already begun on the SE-225 trunked radio, the development of which had dragged on for years.

Around 1991/92, the decision was made to evaluate various sets from foreign manufacturers and the PR4G system from Thomson-CSF was acquired from 1996 on.

SE-235

Technical data

Power supply

  • Batteries: 14.4 V (11 - 30 V vehicle voltage); rechargeable battery (14.4 V; 45 Ah) or battery (24 V) with battery charger ALGT 96.
  • Power supply SA-95 with 24 V output voltage
  • MAG 24 V 400 watt or 1200 watt generator, driven by a two-stroke engine

Dimensions

  • SE-235: 291 x 91 x 245 mm, 5.5 kg; with battery compartment BAF-235 291 x 91 x 330 mm, with the battery included 8.1 kg.
  • BG-235 control unit: 75 x 75 x 220 mm, 0.5 kg

Accessories

  • Microtel MT-235 and headset LG-235
  • The standard antenna used for mobile operation is the MA-235 plug-on marching antenna (with an effective range of 6 km); the range is increased by using the HA-235 high elevation antenna and the FA-235/t long-distance antenna (up to 12 km; telescopic mast consisting of three elements, 7.6 m) or, when used on vehicles, with the FA-235/m long-distance antenna (crank mast with four elements, 9.3 m).
  • The FA-235/m8 remote antenna consists of a crank mast with eight elements and reaches a height of 11.3 m.
  • There are various options for remote control:
    • With the Smart Handset BG-235, the radio can be remotely controlled in the most important functions via a cable with a length of 10 m.
    • The remote control unit FBG-235 can transmit the signals up to 3 km to the radio station via a field cable; a modem / local control unit OBG-235 is required at the transmitter location to hand over the signal to the transmitter.
  • „Fill Gun“ FG-235 for transmitting the frequency / key information from the frequency planning computer FKM-235 to the individual radios.
  • Power amplifier LV-235: Vehicles are usually equipped with the 50 watt power amplifier LV-235, into which two SE-235 transceivers can be inserted. The signal is then transmitted via the vehicle aerials FzA-235 or separately installed remote aerials FA-235/m with corresponding lightning protection BSA-235.
  • On-board communication system BV-235 with an tank headset PSG-235 with headphones in the helmet and throat microphone. The on-board communication system BV-412 can control two SE-235 from a LG-412 headset.

Operation

SE-235, two sets mounted in LV-235, configuration SE-235/m2

Technical principle

The SE-235/SE-435 tactical radio system features automatic frequency selection (automatic selection of an undisturbed frequency range in the event of high band occupancy or jamming) and frequency hopping, in which the radio changes operating frequency several hundred times a second based on information in the TRANSEC key, making it difficult for jammers to track the signal. With „mixed mode“, the two methods are used in combination.

Thanks to good shielding measures, sets at a distance of 10 metres can be operated in the entire 30 - 88 MHz frequency band without compromising on frequency selection. A special „agile cosite filter“ in vehicle stations with two sets allows fixed frequency operation with an antenna spacing of 1.5 m and a frequency separation of 9 %, so that setting up a relay is unproblematic.

Transmission is protected by COMSEC / TRANSEC modules, each set must be assigned the corresponding TRANSEC (encryption of the selection of operating channels in hopping mode) / COMSEC (encryption of data transmission and voice connections) keys in the network and each network is assigned a sub-frequency band with possible blocked frequencies.

A computerised frequency and key planning unit is required for frequency planning, with which the frequency planning can be done automatically. The frequency and key data are transferred from the computer to the individual sets via a „fill gun“, which is connected to the individual sets, or using the OTAR („Over the Air Rekeying“) method.

In HLC mode, the set can communicate in fixed frequency mode with the conventional SE-227, SE-412 or SE-225 radios; for encrypted operation, an external crypto device must be connected and the function switch must be set to the „X MODE“ position.

In contrast to earlier radio networks, in which the device type and the position of a station in the transmission and military hierarchy could be deduced on the basis of device-specific characteristics, each set has its own identifier and the type is known to enemy radio reconnaissance. Since the identifiers are identical, it is not possible to assign them to a specific function, the radio network should be used as intensively as possible. Filtering out the messages of military importance from the control stations from the countless irrelevant messages and attempting to decode them poses a major challenge for enemy reconnaissance.

The system has numerous special functions: with the selective call, individual stations and groups can be targeted, a control station can interrupt ongoing communication with a priority call and pass on its message, every network subscriber can send an alarm call, which displays a predefined alarm message on all surrounding stations, with an emergency deletion, all tactically important key information can be deleted, if there is a risk of the set falling into enemy hands.

For the selective call function, each set is assigned a five-digit network number and a two-digit subscriber number, using the resulting SUBSCR N (subscriber number), each set in the network can be addressed individually.

With the EUROCOM CVSD method, digital information can be transmitted at 50 - 4800 b/sec. with error-correction and the radio system can be fully integrated into the IMFS. In TMDA (Time Division Multiple Acess), short time segments are provided for the transmission of standardised status messages in parallel to the ongoing transmission traffic.

Signals can be forwarded to the network of the fixed IMFS (Integrated Military Telecommunications System) via the radio integration of the CNRI (Combat Net Radio Interface) using RAP (Radio Access Points) in favourable transmitter locations. Obstacles or distances that cannot be overcome by radio technology can thus be bridged without any problems. Technically, it is even possible to access the military network from a RAP while travelling. As soon as the distance becomes too great, the system automatically connects to the next RAP and the call can be continued without interruption. Apart from the continued need to press the transmit button, the radio system therefore provides almost the same quality as modern mobile phones.

Components

The set is completely solid state.

Development

The SE-235/SE-435 renewal project was launched in 1991/92 with the aim of replacing the SE-227 / SE-412 radios, which were over thirty years old. The SE-225 trunked radio, which was developed in Switzerland over numerous hurdles, was not ready for production until 1986 and was introduced almost simultaneously in 1992/94 in the air force / air defence troops.

Various foreign makers were evaluated to replace the infantry radios; in addition to automatic frequency dialling and integrated encryption, one of the main requirements was EKF stability and the ability of the integration into the IMFS, the integrated military telecommunications system.

The PR4G (Poste Radio 4ième Génération) set from the French manufacturer Thomson-CSF, which proved itself in extensive troop trials from 1994, was successful in the tender. The corresponding credit was approved in the Armaments Programme 96 and the order for the first badge was placed in November 1996.

The first sets, manufactured in Switzerland by a consortium under the responsibility of Ascom, were delivered at the end of 1998 and introduced to the troops in 1999.

Deployment

The SE-235 is used in a wide variety of configurations:

SE-235/tManpack radio, carriedTragreff TR-235, accessory pouch on the left with marching antenna and high elevation antenna, accessory pouch on the right with Mikrotel MT-235, one battery inserted, two batteries in accessory pouch
SE-235/m1vehicle radio station with one transceiver SE-235power amplifier LV-235 (0.5 / 5 / 50 Watt) in installation rack, accessory bag, microtel MT-235, additional loudspeaker LS-235installed in vehicles Puch, Duro
SE-235/m2vehicle radio station with two SE-235 transceiverspower amplifier LV-235 in installation rack, accessory bag, two Mikrotel MT-235, two additional loudspeakers LS-235installed in Puch, Duro
SE-235/m2+vehicle radio station with two SE-235 transceiverspower amplifier LV-235+ (0.5 / 5 / 2 x 50 Watt) in installation rack, accessory bag, two Mikrotel MT-235, two additional loudspeakers LS-235installed in Puch, Duro

Technical documentation

Further information

en/se-235.txt · Zuletzt geändert: 2024/01/10 20:23 von mb