Northern Radio RTTY Equipment

Type 178 Model 1A - Diversity audio input converter for twinplex signals (two TTY channels on one RTTY link using 4 tones)	Type 178	Type 178
Type 178	Type 178	Type 178

Type 102 Model 1 - Tone keyer - not for FSK - see schematic here
Type 104 Model 3 - Tone demod, audio to DC loop - not for FSK - see manual/schematic here
Type 105 Model 4A - FSK keyer/exciter (2-4 mc output) - see photo here
Type 105 Model 4B - power supply for Model 4a - see photo here
Type 107 Model 2 - Dual channel audio FSK converter with tuning scope - fixed shift - see photo here
Type 115 Model 1 - Master VFO (2-32mc) - see photo here
Type 125 model 1 - FAX converter, AFSK to AM
Type 152 model 3 - Dual tone demod - not for FSK
Type 153 model 2 - Dual tone keyer - not for FSK? - see photo here
Type 174 Model 1 - Dual diversity audio FSK converter with tuning scope - tubes, plug-in shift? - see photo here
Type 174 Model 2 - similar to Model 1 but solid state - see photo here
Type 174 Model 3 - similar to model 2, with tunable shift control
Type 328 model 1 - AFSK demod, solid state