Flood Alert Station SE-221 / RT 24
überarbeitet am 10.1.2013
The Flood Alert service of the Swiss Army is a service provided by troops
used for the observation and defense of the many dams of hydroelectric plants
in the Swiss Alps. The observers are connected with the National Alert command
by landlines, as a backup, wireless connections were installed using special
VHF equipment, frequencies just below the FM bradcast band were used for this
For the Flood Alert service assured by observer and defense detachments at
dams of hydroelectric plants in the Swiss Alps, wireless VHF links were used
as a backup for landlines to be used in case of an emergency. The wireless stations
use frequencies in the VHF band just below the frequencies of the FM broadcast band.
The VHF wireless station SE-221 (RT 24, a police wireless station RT 22 adapted for military use)
is a compact solid state unit taking only half of the volume of a compact aluminum case.
There are different variants of the station:
I don't have access to the schematics of this station and no informations about it's predecessor SE-223.
Between 1969 - 1973, 150 sets have been purchased, they were withdrawn in 1992 and replaced by the SE-225, a VHF transceiver with automatic frequency selection (trunked radio station).
© 10.1.2013 Martin Bösch