en:se-450_ii
no way to compare when less than two revisions
Unterschiede
Hier werden die Unterschiede zwischen zwei Versionen angezeigt.
— | en:se-450_ii [2020/01/01 20:06] (aktuell) – angelegt - Externe Bearbeitung 127.0.0.1 | ||
---|---|---|---|
Zeile 1: | Zeile 1: | ||
+ | ====== SE-450 / II (SF station / LF station) ====== | ||
+ | **Radio station SE-450 / II** or **High Power radioteletype station** (with 1000 W power amplifier) resp. **Low Power radioteletype station** (with 400 watt power amplifier); manufactured by [[SRT]]. | ||
+ | With the introduction of the [[ARQ]] operation, a radioteletype mode with automatic error correction, which is also referred to as SITOR, the [[embassy radio]] stations and the mobile stations for training were equipped with new station material. | ||
+ | |||
+ | Most of the radio station equipment now came from [[SRT]], the [[ARQ]] modem from [[Philips]]. Earlier, a configuration with the modified Siemens 1 kW transmitter as power amplifier stage was used, even longer in some embassies abroad. | ||
+ | |||
+ | The 1000 W solid state power amplifier from [[SRT]] was only used at the Swiss embassy radio communication central, all older morse telegraphy stations still in use were replaced by the variant with the solid state 400 W amplifier. | ||
+ | |||
+ | {{: | ||
+ | ===== Technical data ===== | ||
+ | {{ : | ||
+ | * [[Principle]]: | ||
+ | * [[Receiver]]: | ||
+ | * [[CR 91]] from [[SRT]]: [[Double conversion]], | ||
+ | * [[Transmitter]]: | ||
+ | * Transmitter exciter [[TD 90]] from [[SRT]] | ||
+ | * Power amplifier 400 W: **SSA 400** from [[SRT]] | ||
+ | * Power amplifier 1000 W: **SSA 1000** from [[SRT]] (only at the Swiss embassy radio headquarters) | ||
+ | * [[Modes]]: [[A1]] for emergency communication, | ||
+ | * [[Frequency range]]: 1.5 - 30 MHz (reception 10 kHz - 30 MHz) | ||
+ | * [[Sensitivity]]: | ||
+ | * [[Output power]]: 1000 W eff. | ||
+ | |||
+ | ==== Power Supply ==== | ||
+ | * [[Mains]]: three-phase mains 3 x 380/220 V | ||
+ | * [[Generator]]: | ||
+ | The entire power supply of the stations was controlled from a central control panel **ST 84**. With the MAIN Switch, the station can be operated from the local AC network or from a generator in case of an emergency or power failure, | ||
+ | With the METER SWITCH, the three phases of the mains network or of the generator can be checked. A Schaffner FR 211 line filter is used to filter out interference pulses from poor quality mains network which could impair the functioning of the station.\\ | ||
+ | Voltage regulators were sometimes used to compensate for unstable mains voltages. In countries with a 60 Hz mains frequency, a 220V voltage with a frequency of 50 Hz must also be prepared for the teletype machine [[PACT-220]]. | ||
+ | |||
+ | ==== Dimensions ==== | ||
+ | The training mobile radio station was installed on a Berna 4x4 truck, the generator in a single-axle trailer. | ||
+ | |||
+ | ==== Accessories ==== | ||
+ | * Antennas | ||
+ | * **AGD antenna**: 2 - 13 MHz, 1 kW max. load; dipole with a distance of 30 m between the masts | ||
+ | * **AGV antenna**: 9 - 30 MHz, 700 W max. load; four segment mast antenna | ||
+ | * Roof antenna on the truck; only for training purposes, low transmission power | ||
+ | * Antenna selector [[ASU 84]] | ||
+ | {{: | ||
+ | ===== Station equipment ===== | ||
+ | The centerpart of the radio station is the [[TD90]] exciter transmitter driving a solid state **SSA 400** power amplifier or a 1000 W power amplifier **SSA 1000** in the embassy radio central; in the embassies, usually the final stage of the 1 kW Siemens transmitter continuied to be used as power amplifier. | ||
+ | |||
+ | At the control desk, the ARQ modem **[[STB 750]]**, the tranmitter control unit **[[TCU 90]]**, the receiver [[CR 91]] and the transmitter exciter **[[TD 90]]** are located. | ||
+ | |||
+ | The ARQ modem **[[STB 750]]** made by [[Philips]] generates the SITOR signal ([[ARQ]]). The SITOR teletype mode is an FSK radioteletype mode with error correction for omitted characters.\\ | ||
+ | For " | ||
+ | Only for emergency situations, F1 (FSK) standard teletype mode 50 Bd without error correction is provided. For service communication, | ||
+ | |||
+ | All functions of the station can be controlled from the control unit **[[TCU 90]]**. The frequency memory and station identifier are called up in various modules. | ||
+ | |||
+ | {{ : | ||
+ | |||
+ | The receiver used is the double conversion **[[CR 91]]** from [[SRT]], which provides sufficient frequency stability for ARQ operation. | ||
+ | |||
+ | The exciter [[TD 90]] provides an RF output power of 100 mW in the complete fequency range 1 - 30 MHz and drives the power output stage in use. | ||
+ | |||
+ | {{ : | ||
+ | The transmitter power amplifier consisting of the final amplifier of the original 1 kW FSK transmitter from Siemens [[S-502]] can be remotely operated. The power apmlifier can be tuned to the 1.5 - 30 MHz range in three ranges: 1.5 - 4/4 - 11/11 - 30 MHz.\\ | ||
+ | During the eighties, the tube power amplifier was replaced by the solid state power amplifier **SSA 400** with a power of 400 W, only at the Swiss embassy radio headquarters, | ||
+ | |||
+ | As teleprinter system to print the messages, instead of the noisy rattling teletype machine Siemens [[Stg-100]], | ||
+ | |||
+ | From 1995 on, the **MVS** messaging system was introduced, so transferring messages to punched tape was no longer required. A switch automatically selected between the teleprinter or the MVS as the output channel. | ||
+ | |||
+ | The antenna selector **ASU-84** (Antenna Switch Unit) feeds the RF to the antenna system, the station has an automatic antenna tuner **KGA**. | ||
+ | |||
+ | ===== Technical principle ===== | ||
+ | |||
+ | |||
+ | ==== development ==== | ||
+ | {{ : | ||
+ | |||
+ | Also in the mid-1980s, the Siemens power amplifier was replaced by a solid state power amplifier from [[SRT]], usually the **SSA 400** and in special cases the more powerful 1000 W unit **SSA 1000** was used. | ||
+ | |||
+ | ==== Field use ==== | ||
+ | The radio station [[SE-450]] was used for [[embassy radio]] communication, | ||
+ | |||
+ | In regular operation, the foreign embassy stations operated on timed control. A timer on the main control panel activated the station at a pre-programmed times, the frequencies were selected according to the propagation conditions at the planned transmission time. Only as exceptions, the station could be powered up manually. | ||
+ | |||
+ | For use in crisis regions, there were plans to construct some stations as container stations. | ||
+ | |||
+ | {{gallery>: | ||
+ | |||
+ | ===== Technische Unterlagen ===== | ||
+ | |||
+ | ==== Weitere Informationen ==== |
en/se-450_ii.txt · Zuletzt geändert: 2020/01/01 20:06 von 127.0.0.1