[b71] Lorenz 6P203 Communication receiver
Links to pages for similar
equipment:
b 72.
Siemens Funk 745 E310 "Rainbow receiver"
b 73. Racal Ra 17 mods
Lorenz 6P203 communication receiver
1430-8800MHz.
It is an odd frequency range, perhaps it is constructed
for short distance communications?
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RX seen from below and above
RX block diagram
Partly circuit diagram for 6P203
Lorenz 6P203 AM/CW and AGC-detectors
Note that the IF is splitted, with two different last IF
stages, one for CW/SSB detector and
another for AGC, so it is no problem to receive CW/SSB with AGC
on. The only modification
needed, was to change the anode resistor for BFO from 220k to 33k
to increase the anode
current and increase the BFO injection. Used it on many evenings
listening to 3800kc, and I
am surprised that the audio quality for ssb is so well. Audio
output stage is a 6AU6/EF94. The
receiver has also a remarkable good audio cw filter with
bandwidth down to 0.3kHz.
2005.01.25