en:se-404
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+ | ====== SE-404: G1.2K ====== | ||
+ | **High Power 1.2 kW shortwave station**, **G1.2K**, **" | ||
+ | The **G1.2K** was developed for the Air Force. The high power shortwave station, which got the designation **C-station** is technically quite similar to the [[SE-302|G1.5K / B station]]. According to the needs of the Air Force, the frequency range of the transmitter was adjusted to a higher frequency range of 2 - 12 MHz and covered the needs of Switzerland well. The need for improved mobility was taken into account, the station was installed it in a truck with better off-road performance. | ||
+ | |||
+ | The shortwave transmitter with it's 1.2 kW output and plate modulation was developed around 1935/37 by [[Lorenz |C. Lorenz AG]] in Berlin - Tempelhof and constructed in 1940 - 1941 by the [[Standard|Standard Telephon & Radio AG]] in Zurich. The G1.2K station was used for Air Force command communications and later for broadcasting air alert messages. | ||
+ | |||
+ | {{: | ||
+ | ===== Technical Specifications ===== | ||
+ | * [[Principle]]: | ||
+ | * [[Transmitter]]: | ||
+ | * [[Receiver]]: | ||
+ | * [[Modes]]: [[A1 | CW (A1)]] with BFO, [[A2 | Sounding telegraphy (A2)]], [[A3 | AM (A3)]], [[Hell]] | ||
+ | * [[Frequency range]]: 2 - 12 MHz | ||
+ | * [[Sensitivity]]: | ||
+ | * [[Output Power]]: [[A1|A1 (top line)]] 1200 W, [[A3|A3 (middle line)]] 400 W | ||
+ | |||
+ | ==== Power Supply ==== | ||
+ | * [[Generator]]: | ||
+ | |||
+ | ==== Dimensions ==== | ||
+ | {{ : | ||
+ | * Saurer 6x6 off-road truck as station vehicle | ||
+ | |||
+ | ==== Accessories ==== | ||
+ | * A self-radiating 25 m telescopic mast from Magirus is used as standard antenna. | ||
+ | |||
+ | ===== Station Equipment ===== | ||
+ | As an alternative to the [[SE-302|High power shortwave station G1.5K]], the transmitters of the G1.2K was adapted to the needs of the air force to operate in a higher frequency range, which caused a certain reduction in the output power.\\ | ||
+ | To improve mobility, the station was mounted on a Saurer 6x6 off-road truck (10,000 kg); the generator was mounted on a single-axle trailer (2,200 kg). | ||
+ | |||
+ | {{ : | ||
+ | One tube [[de: | ||
+ | The station has a maximal output power of 1200 W in CW telegraphy (A1) and 400 watts in modulated telegraphy and telephony. | ||
+ | |||
+ | {{ : | ||
+ | Operation modes are CW (A1) and modulated (A2) telegraphy, telephony (A3) and also [[Hell]] teleprinting. The [[Hell]]-Schreiber developed by Siemens is a 7x7 dot matrix teleprinter which prints directly readable plain text on paper tape. The technical requirements for [[Hell]] teleprinting over short-wave connections were very high and communication suffered from poor propagation conditions, so that in 1944 the [[Hell]] mode was suspended.\\ | ||
+ | Later, the [[Autophon]] [[E44]] all-wave receiver was used as main receiver; apparently after 1948. Then, also high speed telegraphy was introduced. | ||
+ | |||
+ | The G1.2K / C station is powered by a four-stroke petrol engine " | ||
+ | |||
+ | A self-radiating 25 m Magirus telescopic mast was used as standard antenna, is was erected on the roof of the station truck.\\ | ||
+ | The vehicle antenna or a long-wire antenna was used as receiving antenna. For duplex operation, the receiving site had to be remote operated. | ||
+ | |||
+ | ===== Technical principle ===== | ||
+ | |||
+ | ==== Valve Layout ==== | ||
+ | **Transmitter**: | ||
+ | V5, V6 (two [[de: | ||
+ | |||
+ | ==== Development ==== | ||
+ | The high power shortwave radio station G1.2K was developed by [[Lorenz|C. Lorenz AG, Berlin]] in around 1935/37 and manufactured by [[Standard|Standard Telephon & Radio AG]] in Zurich in 1940/41. | ||
+ | |||
+ | A total of 16 stations (according to Ritter 20, 8 of them on chassis M6 and 12 on chassis 2CM) were purchased and handed over as G1.2K or "C Station" | ||
+ | |||
+ | ==== Field use ==== | ||
+ | The G1.2K / SE-404 was used by the Air Force signal units for command communication; | ||
+ | |||
+ | {{gallery>: | ||
+ | |||
+ | ===== Technical Documentation ===== | ||
+ | * {{ : | ||
+ | |||
+ | ==== Additional Informations ==== | ||
+ | * [[http:// | ||
+ | * [[https:// | ||
+ | * [[https:// |
en/se-404.txt · Zuletzt geändert: 2019/12/14 22:29 von 127.0.0.1