en:se-408
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+ | ====== SE-408: FIX ====== | ||
+ | **Radio Station FIX**, **SE-408**, original US designation **SCR-508**; | ||
+ | To renew the equipment of the Swiss signal troops after the ye ars of World War II, in 1946/49 a large amount of signal equipment was purchased from American surplus stocks. | ||
+ | |||
+ | The U.S. station **[[SE-400|SCR-608]]** was acquired in this context; with this set, the VHF range was for the first time in Switzerland used for military communication. At the same moment, frequency modulation was also used for the first time in a military radio set. The device got the designation " | ||
+ | |||
+ | In 1951, the Swiss Army acquired a series of franch AMX tanks, the radio set SE-508 from french licence production was already built in. It is technically almost identical however, the frequency coverage is significantly lower. In the [[SE-408]] the upper shortwave range from 20 - 27.9 MHz is covered. | ||
+ | |||
+ | {{: | ||
+ | ===== Specifications ===== | ||
+ | * [[Principle]]: | ||
+ | * [[Transmitter]]: | ||
+ | * [[Receiver]]: | ||
+ | * [[Modes]]: [[F3 |FM (F3)]] | ||
+ | * [[Frequency Range]]: 20 - 27.9 MHz | ||
+ | * [[Sensitivity]]: | ||
+ | * [[Output power]]: [[F3 | FM (F3)]] 30 Watts | ||
+ | |||
+ | ==== Power Supply ==== | ||
+ | * [[Accumulator / Batteries]]: | ||
+ | * [[Generator]]: | ||
+ | |||
+ | ==== Dimensions ==== | ||
+ | * Transmitter BC-604: 457 x 292 x 230 mm; 30.4 kg | ||
+ | * Two receivers BC-603: 171 x 292 x 287 mm; 31.75 kg | ||
+ | * Mounting frame FT-237: 908 x 387 mm; 20 kg; total weight of the complete station 82 kg | ||
+ | |||
+ | ==== Accessories ==== | ||
+ | * The standard vehicle antenna is a three - element 2.7 m whip antenna. (Mast base MP-48-A, mast segments MS-51, MS-52 and MS-53). | ||
+ | * The transmission crystals are stored in the crystal box **BX-40** | ||
+ | * Remote operation is possible with the remote control equipment **RM-29-D**. | ||
+ | * Measurements on the set for service purposes are possible with the adapter FT-384. | ||
+ | |||
+ | ---- | ||
+ | {{ : | ||
+ | |||
+ | ===== Operation ===== | ||
+ | The radio station **SE-408** or the corresponding original U.S. variant **SCR-508** consists of two receivers BC-603 and a transmitter BC-604 mounted on a mounting frame FT-237. By default, the device is operated with 12V DC from the vehicle battery, a dynamotor generates the necessary plate voltages. | ||
+ | |||
+ | The device covers 10 crystal controlled channels in the range of 20 - 27.9 MHz. In the SCR-608 variant set, the frequency tripler stage was wired before the frequency doubler stage, so the twenty channels came in the 27 - 38.9 MHz frequency range; in Switzerland, | ||
+ | |||
+ | {{: | ||
+ | |||
+ | In a bottom row of controls, the (auxiliary) antenna and ground connectors, the switch to tune and operate the set, the switch of the onboard intercom in a tank and the squelch control are located; the squelch threshold is set with the SENSITIVITY control. | ||
+ | |||
+ | {{: | ||
+ | On the **Transmitter** front panel, the controls are located on the right in a frame-protected area. On its left side, the ten fixed frequency buttons are located below the connectors for the (auxiliary) antenna and ground. The quartz crystals are inserted in the crystal holders located behind the cover on the left. The switch below the channel buttons switches from tune to operation. | ||
+ | |||
+ | At the right below the instrument, which can be set to tune and display the antenna current, the main switch and the switch for transceive - onboard intercom operation are located. | ||
+ | |||
+ | The transmitter is equipped with seven valves [[de:1619]] and one [[de:1624]] as a output valve. Some spare tubes are housed inside the cabinet. | ||
+ | |||
+ | ===== Technical Principle ===== | ||
+ | {{ : | ||
+ | **Receiver BC-603**: The RF signal from the antenna is amplified (V1, [[de: | ||
+ | |||
+ | {{ : | ||
+ | |||
+ | **Transmitter BC-604**: With the pushbutton unit, the corresponding transmitter crystal (operation frequency is 54 times the crystal frequency) is connected to the transmitting oscillator (V107, [[de: | ||
+ | |||
+ | ==== Tube Layout ==== | ||
+ | **Receiver BC-683-A**: V1 ([[de: | ||
+ | |||
+ | **Transmitter BC-684-A**: V101 ([[de: | ||
+ | |||
+ | ==== Development ==== | ||
+ | In a joint development project, the Link Radio Corporation, | ||
+ | |||
+ | After the end of the Second World War, many of these sets were for sale in the surplus market. After successful trials, the Swiss Army acquired a number of the American VHF radio, which gave the impetus for the shift of the tactical military communication into the VHF frequency band. | ||
+ | |||
+ | The parallel development SCR-608 working on the slightly lower frequency band was also introduced as [[SE-400]]. | ||
+ | |||
+ | ==== Field Use ==== | ||
+ | In 1951, Switzerland bought French AMX 13 tanks, these were introduced as "Light Tank 51" in the Swiss army. This tank was factory-equipped with SCR-508 built unter French license. For this reason, the radio stations with the designation SE-408 have French front plate lettering. | ||
+ | |||
+ | In the late 1950s, the AMX tanks were modified and got an upgraded tank gun. As a result of this upgrade, there was no more space for the SE-408 radio in its original location and the tank was converted to a remote-controlled Autophon [[SE-407]] radio. | ||
+ | |||
+ | The devices found another use with the border protection brigades until 1975 and were liquidated in 1976. | ||
+ | |||
+ | {{gallery>: | ||
+ | |||
+ | ===== Technical Information ===== | ||
+ | * {{ : | ||
+ | * {{ : | ||
+ | |||
+ | ==== Additional Information ==== | ||
+ | * [[http:// | ||
+ | * [[https:// | ||
+ | * [[https:// | ||
+ | * [[http:// |
en/se-408.txt · Zuletzt geändert: 2019/11/20 20:10 von 127.0.0.1