SE-415 / Schwere Funkfernschreibstation / Radioteletype Station
überarbeitet am 11.9.2010
The Swiss manufacturer Zellweger, Uster, had a very good reputation for their
SE-222 medium power shortwave transceiver, in 1957, they were offered a contract
for the construction of a more powerful military shortwave station.
The complete transceivers comes in a heavy duty steel cabinet, the empty
cabinet has a weight of 89 kg! In the cabinet, You find supporting rails, oh these
all the separate modules can be pulled out like drawers, You have to unscrew the
black round knobs and finally press them in to unlock the mechanism. Inside the cabinet,
You find flexible supports with attached multipole connectors to connect all the
Behind the metal plate of the bottom drawer, You have access to the Connectors module: here You have connectors for the mains, the mains 10Amp fuses, several connectors for using teleprinters, the receiving and transmitter antennas, a wired remote control and sockets for 12V DC and 220V AC to connect gear used in the radio shack.
The next "drawer" is the High Voltage, module, You have acess to the fuses for the 1,8 kV plate voltage of the transmitter and a operation hours meter.
Above, You find the so called Power Supply Module,
an impressive number of fuses are used for the different voltages used in the set.
When the drawer is unlocked and pulled out, You find a circular switch and a meter
to perform a quick control, which of the fuses is blown.
The following drawer acts as the "central" or "command post" of the transceiver:
the Signal Module. You find the connectors
for headphones and morse key here, the connector "MIKROTEL" is used for connecting
a telephone like handset with a PTT (push to talk) button.
The Receiver is a triple conversion
heterodyne set with two different RF- / IF- amplifier strips used for antenna
diversity reception. The three main tuning knobs are used to control the reception
frequency, it is displayed by a mechanical digital readout similar to the one found
in the Collins R-390A with a dial accuracy of better then 100 Hz.
The Transmitter is situated
in the top module. You will have to select the transmitting frequency using
the three tuning knobs of the transmitter main tuning oscillator, both oscillator
modules are interchangeable.
For the SE-415 wireless station, there has been many optional equipment like an external voltage stabiliser and an isolation transformer for mains use, an automatic antenna tuning unit used for the whip antenna of the vehicle on frequencies between 12 and 52 MHZ and a second dipole antenna tuner used for the 2 - 12 MHz range.