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en:se-404 [2019/12/14 22:29] (aktuell) – angelegt - Externe Bearbeitung 127.0.0.1
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 +====== SE-404: G1.2K ======
 +**High Power 1.2 kW shortwave station**, **G1.2K**, **"C-station"** of the air force resp. **SE-404**; manufactured by [[Lorenz]] / [[Standard|Standard Telephon und Radio AG, Zürich]].
  
 +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.
 +
 +{{:images:se-404-betriebsfahrzeug.jpg?direct&400|SE-404 / G1,2K}}
 +===== Technical Specifications =====
 +  * [[Principle]]: Shortwave wireless station with separate [[transmitter]] and [[receiver]]
 +    * [[Transmitter]]: [[Lorenz|C.Lorenz / STR]]: 2 - 12 MHz
 +    * [[Receiver]]: [[Zellweger]] [[E-601]] (E41): [[single conversion]], [[IF]]
 +  * [[Modes]]: [[A1 | CW (A1)]] with BFO, [[A2 | Sounding telegraphy (A2)]], [[A3 | AM (A3)]], [[Hell]]
 +  * [[Frequency range]]: 2 - 12 MHz
 +  * [[Sensitivity]]: [[A3|AM (A3)]] / [[Selectivity]]:
 +  * [[Output Power]]: [[A1|A1 (top line)]] 1200 W, [[A3|A3 (middle line)]] 400 W
 +
 +==== Power Supply ====
 +  * [[Generator]]: single axle trailer with three-phase generator (380 V, 50 Hz, 15 kVA) powered by a gasoline engine 22 HP.
 +
 +==== Dimensions ====
 +{{ :images:se-404-g12k-fahrzeug.jpg?direct&300|SE-404: station vehicle}}
 +  * 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).
 +
 +{{ :images:se-404-g12k-sender.jpg?direct&300|SE-404, transmitter}} **[[Transmitter]]**: The three stage Lorenz transmitter can be tuned by means of variable capacitors in four frequency ranges, all circuits run in synchronism; the antenna is tuned by means of a sliding wire variometer.\\ 
 +One tube [[de:RS337]] is used in the driver stage, two [[de:RS337]] in the intermediate stage, two [[de:RS329g]] in the final output stage, two [[de:RS382]] and three rectifier tubes [[de:RGN2504]] in the modulator and keying stage. In the (microphone) amplifier, two [[de:RS282]] and three [[de:RE084k]] are used.\\ 
 +The station has a maximal output power of 1200 W in CW telegraphy (A1) and 400 watts in modulated telegraphy and telephony.
 +
 +{{ :images:se-404-g12k-empf.jpg?direct&300|SE-404: Empfänger}} **[[Receiver]]**: The all-wave receiver "Uster" / [[E41]] was used as main receiver.\\ 
 +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 "Phaenomen" which drives a 15 kVA three-phase generator mounted on the generator trailer (2200 kg).
 +
 +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**: V1 ([[de:RS337]], driver stage), V1, V2 (two [[de:RS337]], intermediate stage), V3, V4 (two [[de:RS329g]], final stage) \\
 +V5, V6 (two [[de:RS382]], modulator and keying circuit), two [[de:RS282]] and three [[de:RE084k]] in the (microphone) amplifier, three rectifier tubes [[de:RGN2504]].
 +
 +==== 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" to the Air Force signal units.
 +
 +==== Field use ====
 +The G1.2K / SE-404 was used by the Air Force signal units for command communication; after TO 1961, the SE-404 were transferred to the signal troops as alert message broadcasting stations and faded out in 1967.
 +
 +{{gallery>:images?se-404*.jpg&0&80x80&lightbox&showtitle&titlesort}}
 +
 +===== Technical Documentation =====
 +  * {{ :manuals:se-404-mast-kloeckner-km25-7.pdf |SE-404 (whs.): Mast Klöckner KM25/7}}
 +
 +==== Additional Informations ====
 +  * [[http://armyradio.ch/radio-d/se-404.htm|SE-404 / G1,2K on www.armyradio.ch]]
 +  * [[https://www.hamfu.ch/de/geraete/geraet.php?id=107|SE-404 / G1,2K on Hamfu website]]
 +  * [[https://www.radiomuseum.org/r/lorenz_grosse_12_kw_kurzwellenstation_g12k_c_station.html|SE-404 / G1,2K on www.radiomuseum.org]]
en/se-404.txt · Zuletzt geändert: 2019/12/14 22:29 von 127.0.0.1