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+====== SE-303: G3L ======
+**High power 3 kilowatt long wave station**, **G3L** or **SE-303**; made by [[Telefunken, Berlin]].
+The high power long - wave radio station **G3L** (Grosse 3 kW Langwellenstation) was developed by Telefunken GmbH, Berlin, around 1932 and was handed over to the troops in 1934/36. A total of 6 stations were operated by the signal troops to provide command communication links between the Army command and the field corps on long-waves.
+{{:images:se-303-g3l-stationswagen.jpg?direct&800|SE-303, transmitter and operators trailer}}
+===== Technical Specifications =====
+  * [[Principle]]: Longwave wireless station consisting of separate [[transmitter]] and [[receiver]]
+    * [[Transmitter]]: [[Telefunken]] Spez 914Bs; [[Frequency Range]]: 100 - 600 kHz
+    * [[Receiver]]: [[Telefunken]] Spez 470Bs or [[E31]]: three tuned circuit TRF receiver
+  * [[Modes]]: [[A1 | CW (A1)]] with BFO, [[A2]], [[A3 | AM (A3)]], [[Hell]]
+  * [[Sensitivity]]: [[A3 | AM (A3)]] / [[selectivity]]:
+  * [[Output Power]]: [[A1]] 3000 W; [[A3]] 1000 W
+==== Power Supply ====
+  * [[Generator]]: Three - phase generator (380 V, 50 Hz) to be powered from a petrol engine.
+==== Dimensions ====
+  * Transitter trailer: 6.20 x 2.25 x 2.80 m; 6000 kg
+  * Radio operators trailer: 6.20 x 2.25 x 2.80 m; 4100 kg
+  * Generator, loaded on truck; 1500 kg
+==== Accessories ====
+  * **Antenna material**: The G3L / SE-303 was usually operated on a three-wire 80 m long T / L antenna, which was erected between two 22 m high masts, the space required for the station was 40 x 100 m.
+===== Station Equipment =====
+The long - wave wireless station G3L was developed by **Telefunken GmbH, Berlin** in around 1932 and handed over to the troops in 1934/36. A total of 6 stations were were acquired; the signalmen of the Schwere Funkerkp provided command communication using [[Hell]] teleprinters on long-wavesbetween the Army command and the field corps HQ.
+Usually, the station was used in mobile operation. It consisted of a truck with the generator to power the transmitter (1500 kg), a two-axle transmitter trailer with the long-wave transmitting equipment (6000 kg) and another two-axle trailer with the receiver and Hellschreiber - equipment (4100 kg).
+One station G3L had during the years of "active service" in WW II a fixed installation in the "Funkerhaus" ("signals building") in Bern, this fixed station of the army command was also used to broadcast regular Morse code training lessons.
+{{ :images:se-303-g3l-sender-bw.jpg?direct&300|Sender Spez 914Bs}} The three-stage transmitter Telefunken **Spez 914Bs** is tunable in four ranges by means of variometers, all tuned circuits are synchroneous. The antenna tuning is also done with wire - variometers.
+In the transmitter, 20 tubes are used. In the driver stage a valve [[de:RS329g]], in the intermediate stage one [[de:RS329g]], and in the RF final stage another four [[de:RS329g]], all final triods are grid modulated.
+The station has a maximum output power of 3000 W in CW telegraphy (A1) and 1000 watts in modulated telegraphy, telephony and [[Hell]] teleprinting.
+The standard **receiver** was the Telefunken long wave receiver Spez 470Bs or [[E31]]. The three tuned circuit TRF receiver covers a frequency range of 100 - 1091 kHz in four ranges and is equipped with six [[de:RE074n|RE074 neutro]] valves.\\
+Later, the [[E31]] was replaced by the autophone all-wave receiver [[E39]].
+{{ :images:e-6xx-telefunken-e31-spez-470-front.jpg?direct&300|Empfänger Spez 470Bs}}
+===== Technical Principle =====
+==== Valve layout ====
+**Transmitter** Spez 914Bs: six rectifiers [[de:RG49]], six [[de:RS329g]], one of each in the oscillator and driver and four in the transmitter output stage, five tubes [[de:RS237]], three of them as keying tubes and two as modulator tubes, two [[de:RE084k]] in the modulator preamplifier, one [[de:RGN2504]] to rectify the blocking voltage.\\
+**Receiver**: see [[E31]] and [[E39]].
+==== Development ====
+The development of the wireless station was done in 1932 at Telefunken in Berlin. The station was equipped as a novelty with the then state-of-the-art [[Hell]] - teleprinter, this transmission mode proved to be stable and reliable when used on longwaves, but not on shortwaves.
+==== Field Use ====
+The High Power Longwave Station was developed in 1932 at [[Telefunken, Berlin]] and six stations at a unit price of 228'000.- Fr. were acquired in 1934/36.
+First, the G3L / SE-303 was operated by signalmen of the Fk Kp 27 and 28, later it was transferred to Lst Fk Kp and they were withdrawn and liquidated in 1961. Later the command communication between army command and the field corps was done by the remote controlled station SE-415.
+{{gallery>:images?se-303*.jpg&0&80x80&lightbox&showtitle&titlesort}}
+===== Technical Manuals =====
+==== Additional Informations ====
+  * [[http://armyradio.ch/radio-d/se-303.htm|SE-303 / G3L on www.armyradio.ch]]
+  * [[https://www.hamfu.ch/de/geraete/geraet.php?id=132|SE-303 / G3L on Hamfu website]]