Wartime Wireless
Typical of WWII British Wireless Intercept ("Y Service") Receiving Stations monitoring German High Command Lorenz S42 Geheimschreiber-encrypted RTTY traffic ("Tunny").
The receivers are the ubiquitous RCA AR88D, supplied in their hundreds under the USA-UK lend-lease agreement. Above these are the FSK demodulators, bandpass audio filters and patchbay.
The units in the right foreground are Marconi High Speed Recorders Type UG6A ("Undulator") - syphon ink recorders producing the hard-copy paper "slips" from which the raw five-unit Baudot code was transcribed manually to punched tape for onward analysis and decryption.
Bletchley Park.
Wartime Wireless
Typical of WWII British Wireless Intercept ("Y Service") Receiving Stations monitoring German High Command Lorenz S42 Geheimschreiber-encrypted RTTY traffic ("Tunny").
The receivers are the ubiquitous RCA AR88D, supplied in their hundreds under the USA-UK lend-lease agreement. Above these are the FSK demodulators, bandpass audio filters and patchbay.
The units in the right foreground are Marconi High Speed Recorders Type UG6A ("Undulator") - syphon ink recorders producing the hard-copy paper "slips" from which the raw five-unit Baudot code was transcribed manually to punched tape for onward analysis and decryption.
Bletchley Park.