SE-214 / T.S. 25
Tragbar Schwere Funkstation 18 / 25
Telefunken GmbH, Berlin; Telefunken AG, Zürich

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überarbeitet am 6.1.2013

The Tragbar Schwere Funkstation 18 ("Heavy Portable Wireless Station 18") has been acquired after the end of World War I, it was an improved version of the German Telefunken station US 17/D.
In the years 1923/24 it has been improved and when the Wireless Detachment of the Swiss Army has been founded, a few more wireless sets had to be acquired, these got the designation "Tragbar Schwere Funkstation 25".
In the early years, this stations had also to be used in the role of ground station of military aviation. The T.S.25 remained in service from 1925 until 1947.

Portable long wave station with separate transmitter and receiver,

Transmitter: Telefunken AR 125 (1919) resp. AR 245 (1925): 166 - 1000 kHz
Receiver: Telefunken E266 (ab 1922), followed by Spez 7Bs (1926)
later replaced by the E31: Spez 470 Bs (1932), 100 - 1091 kHz

CW (A1)

pout A1 15 W (AR 125) / 20 W (AR 245)



Fuel operated generator MAG 2C36 12-24V 6A and 800V 0,1 A or hand cranked generator,
12 V accumulators and plate voltage battery
two wire T- or L- antenna, lenght 50 m, between two 9 m masts

This longwave station has been developed by Telefunken, Deutsche Gesellschaft für drahtlose Telegraphie, Berlin. The first sets have been acquired in 1918/9 and the got the designation "Tragbar Schwere Funkenstation 18", it consisted of the valve transmitter AR 125 and a TRF receiver of an unknown type. After 1922, this early receiver has been replaced by the E 266, a TRF receiver with adjustable reaction.

After it's renewal, the station was renamed Tragbar Schwere Funkstation 25 / T.S.25: the transmitter was replaced by the higher power AR 245 and the receiver by the Spez 7Bs TRF receiver with two tuned circuits and a voice amplifier Spez 60 Bs, all made by Telefunken.

Tfk - Empfänger Spez 470 Bs Tfk- Sender AR 245
Receiver Tfk Spez 470 Bs Transmitter Tfk AR 245

The transmitter AR 125 of the T.S.18 is an improved Meissner - Transmitter US 17/D, it's two triodes RS5 gave it an antenna output power of 15 Watts; after 1926 it was replaced by the transmitter AS 245, with it's two more powerful triodes RS55, it had an antenna output power of 20 W, reportedly this was sufficient for distances up to 50 - 75 km.

The type of the earliest receiver is still unknown, after 1922, the TRF receiver with adjustable reaction Telefunken E 266 was used, this was replaced by the Telefunken Spez 7 Bs with two tuned circuits in 1926 (two triodes RE062t) and a voice amplifier Spez 60 Bs.
After 1932, the station was equipped with the Telefunken longwave receiver Spez 470 Bs / E31, a very powerful receiver.

As antennas, a double wire 50 m L- or T atenna between two 9 m masts was used. The complete equipment came in 18 crates, with it's 336 kg, the station was portable in theory, it could be carried by men or an the back of mules or horses in the mountains.

The Tragbar Schwere Funkstation 25 has been in use by the Signal Troops and in the Swiss Air Force, from 1919 - 1929 a total of 56 sets have been acquired. In 1947, the equipment was declared as war reserve and has been lquidated in 1956.
T.S.25 in Stellung

further informations:
d: documents "Funkstationen der Armee"
d: Das Fernmeldematerial der Schweizerischen Armee seit 1975, R.J.Ritter, Folge 6
d: SE-214 / T.S.25 at www.hamfu.ch of IgUem

© 6.1.2013 Martin Bösch