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+ | ====== SE-402: SM46 ====== | ||
+ | **Motorized Radio Station 46**, ** SM46** (" | ||
+ | In the post-war period, the Swiss military short-wave radio network needed renewal and much more equipment was needed, than the domestic industry was able to deliver. From American surplus stocks, sixty shortwave stations **SCR-399** were purchased, the [[Hallicrafters]] HT-4 transmitter was initially developed for the amateur radio market, the receivers [[BC-342]] and [[BC-312]] for the Signal Corps. | ||
+ | |||
+ | In the Swiss Army, the station got the designation **SM 46** and later **SE-402**. One of these stations was restored and was put back to service at the occcasion of " | ||
+ | |||
+ | {{: | ||
+ | ===== Technical Specifications ===== | ||
+ | * [[Principle]]: | ||
+ | * [[Transmitter]]: | ||
+ | * [[Receiver]] 1 (Main operation site): [[US Signal Corps Laboratories|US Signal Corps]] **[[BC-342]]**, | ||
+ | * [[Receiver]] 2 (Subsidiary operation site): [[US Signal Corps Laboratories|US Signal Corps]] **[[BC-312]]**, | ||
+ | * [[Modes]]: [[A1]] with BFO, [[A3|AM (A3)]] | ||
+ | * [[Frequency Range]]: 2 - 18 MHz | ||
+ | * [[Sensitivity]]: | ||
+ | * [[Output Power]]: [[A1]] 275 - 400 watts, [[A3]] 200 - 300 watts | ||
+ | |||
+ | ==== Power Supply ==== | ||
+ | * [[Mains]]: 120 V | ||
+ | * [[Generator]]: | ||
+ | |||
+ | ==== Dimensions ==== | ||
+ | * The dimensions of the GMC truck with the shelter are 6.3 x 2.3 m, with the antenna, the total height is 3.6 m. Together with the generator trailer, the total length is 10 m and the total weight 8.5 t. | ||
+ | |||
+ | ==== Accessories ==== | ||
+ | {{ : | ||
+ | * The standard antenna is a rod antenna consisting of five to seven elements mounted on the roof of the shelter. | ||
+ | * For fixed operation, the construction of a **long-wire antenna** or a powerful **half-wave dipole** was intended. | ||
+ | * The subsidiary operation site can be operated from accumulator power supply. In this case, the secondary receiver [[BC-312]] at the remote site is used for reception and the transmitter is remotely operated. | ||
+ | * Wave meter **[[BC-221]]** for frequency calibration | ||
+ | |||
+ | ---- | ||
+ | {{: | ||
+ | |||
+ | ===== Station Material ===== | ||
+ | The entire 400 watt [[AM]] / [[CW]] radio station is housed in a shelter mounted on a GMC all-terrain truck; a trailer with the generator is used for power supply, if there is no mains connection. | ||
+ | |||
+ | In the interior of the shelter, there is a bench for the operator in the middle, the compartments underneath contain spare parts.\\ | ||
+ | In the front, the transmitter with the US designation **BC-610-E**, | ||
+ | The cabinets to the right contain not only spare parts but also the tuning and antenna coupling coil units for the transmitter. | ||
+ | |||
+ | To the left, next to the transmitter, | ||
+ | To the left of it resp. in the back of the vehicle, the chest **CH-121-A** containing the receiver **[[BC-312]]**, | ||
+ | |||
+ | Three antennas are mounted on the roof of the shelter, the front is the five-segment transmitting antenna, the two rear antennas are the receiving antennas. | ||
+ | |||
+ | ===== Technical Principle ===== | ||
+ | {{ : | ||
+ | ** Transmitter BC-610-E **: the transmitter is a four stage tranmitter, all four stages must be tuned separately: oscillator stage (the oscillator can be crystal controlled or tunable), doubler stage, intermediate stage and output stage. Of all eight **Tuning Units** TU-47 / TU-54 with three pre-tuned channels each and eight output stage coil units "Tank Coils" C-387 / C-449 two sets are stored in the accessories chests.\\ | ||
+ | For crystal controlled fixed frequency operation, the station has two sets of 36 crystals, it can be tuned depending on switching of the doubling / quadrupler stage to the second or fourth harmonic, so that 72 operation frequencies are possible. | ||
+ | |||
+ | {{: images: | ||
+ | ** Receiver [[BC-342]] / [[BC-312]] **: the receivers of the main and secondary operation sites are largely identical, they are only differentially powered from 120 V AC or 12 V DC. The single conversion set with an IF of 470 kHz covers the frequency range from 1.5 - 18 MHz in six segments. | ||
+ | |||
+ | ==== Valve Layout ==== | ||
+ | ** Transmitter BC-610-E **: oscillator (V8, [[de: | ||
+ | In the AF circuit, two AF stages (V1, V2, each [[de:2A3]] in push-pull arrangement), | ||
+ | |||
+ | ==== Development ==== | ||
+ | {{ : | ||
+ | |||
+ | During wartime, an " | ||
+ | |||
+ | The receivers [[BC-342]] / [[BC-312]] were used as receivers in both operation sites, the local operation site near the transmitter and the remote operation site. | ||
+ | |||
+ | ==== Field use ==== | ||
+ | After the end of the Second World War in the years 1946/48, 60 stations were purchased at a price of 103,000 Swiss francs from U.S. surplus to be used in command communications. | ||
+ | |||
+ | The stations were used in addition to the high power wireless stations for command communications and links between the field corps commands. Furthermore, | ||
+ | |||
+ | The last stations were used until they were replaced by the alarm messaging station [[S-510]] in 1979; the stations were liquidated in 1980 and some were purchased by radio amateurs. | ||
+ | |||
+ | {{gallery>: | ||
+ | |||
+ | ===== Technical Documentation ===== | ||
+ | * {{ : | ||
+ | |||
+ | ==== Additional Informations ==== | ||
+ | * [[http:// | ||
+ | * [[https:// | ||
+ | * [[https:// | ||
+ | * [[https:// |
en/se-402.txt · Zuletzt geändert: 2019/12/13 21:02 von 127.0.0.1