en:se-400
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+ | ====== SE-400: FIX ====== | ||
+ | ** Radio Station FIX **, ** SE-400 **, original US designation ** SCR-608 **; manufactured by [[US Signal Corps Laboratories|div. U.S. manufacturers]]. | ||
+ | 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 **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. The device got the designation " | ||
+ | |||
+ | The radio station SE-508, which was introduced with the purchase of the French tank AMX, is technically almost identical. In the [[SE-408]], however, the frequency range is significantly lower with its 20 - 27.9 MHz, in the upper shortwave range. | ||
+ | |||
+ | {{: | ||
+ | ===== Specifications ===== | ||
+ | * [[Principle]]: | ||
+ | * [[Transmitter]]: | ||
+ | * [[Receiver]]: | ||
+ | * [[Modes]]: [[F3 |FM (F3)]] | ||
+ | * [[Frequency Range]]: 27 - 38.9 MHz | ||
+ | * [[Sensitivity]]: | ||
+ | * [[Output power]]: [[F3 | FM (F3)]] 20 Watts | ||
+ | |||
+ | ==== Power Supply ==== | ||
+ | * [[Accumulator / Batteries]]: | ||
+ | * [[Generator]]: | ||
+ | |||
+ | ==== Dimensions ==== | ||
+ | * Transmitter BC-684-A: 457 x 292 x 230 mm; 30.4 kg | ||
+ | * Two receivers BC-683-A: 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-400** or the corresponding original U.S. variant **SCR-608** consists of two receivers BC-683-A and a transmitter BC-684-A 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 27 - 38.9 MHz. In a variant set, the frequency doubler stage was wired before the frequency tripler stage, so the twenty channels came in the 20 - 27.9 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-683-A**: The RF signal from the antenna is amplified (V1, [[de: | ||
+ | |||
+ | {{ : | ||
+ | **Transmitter BC-684-A**: With the pushbutton unit, the corresponding transmitter crystal (operation frequency is 72 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-508 working on the slightly lower frequency band was also introduced as [[SE-408]]. | ||
+ | |||
+ | ==== Field Use ==== | ||
+ | From surplus stocks, a total of 267 units of the SCR-608 were acquired in 1948/9, they were introduced as "Radio Station FIX" or " | ||
+ | |||
+ | {{ : | ||
+ | |||
+ | One major problem was the fact, that frequency-modulated devices could communicate with each other but not with the amplitude-modulated sets from the older generation of wireless equipment, so at times network planning with dual frequency planning was necessary. | ||
+ | |||
+ | The purchase of the SE-400 also anticipated the decision to use the VHF range and frequency modulation for military communications, | ||
+ | |||
+ | The devices remained in troop service until 1970 and were liquidated in 1971. | ||
+ | |||
+ | {{gallery>: | ||
+ | |||
+ | ===== Technical Information ===== | ||
+ | * {{ : | ||
+ | * {{ : | ||
+ | |||
+ | ==== Additional Information ==== | ||
+ | * [[http:// | ||
+ | * [[https:// | ||
+ | * [[https:// |
en/se-400.txt · Zuletzt geändert: 2019/11/19 21:51 von 127.0.0.1