LM Rendezvous Radar

So the LM had a rendezvous radar & the CSM a transponder. I never
really grokked why.

The LM was under insane weight limits, they were shaving heads off
bolts, etc. Why was the heavy radar on it, and not the CSM?

I know that in theory the LM was supposed to find & dock with a
passive CSM but:

a) Why was that ISTR that Plan B has the CSM docking with the LM
if it/its crew was unable to take the lead. The probe was in the
CSM hatch, could be removed by the CSM pilot, etc.

b) Even normally, I'd think that a telemetry scheme so that the LM
got radar data via existing paths would have weighed far less.

c) And with one radar, there'd have been no 1201's.....




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