[Milsurplus] Receivers-what are they

[gl4d21a at juno.com]

Robert or anyone else with wide ranging exposure to mil nomenclature:

Can anyone make any sense out of the following incomplete receiver designations?  They should all be 1960s or later equipment from Navy Security Group.  I have copied them as they appear, some with hyphens and some without.  All help, guesses, speculation, facts, etc. appreciated.  This is what happens when a list gets filtered through too many layers of bureaucracy.

R916C
R-3500-12
R3080 (I think this is a Harris or Cubic#)
R-2509/USQ
R-2345/U
R-2307/U
R-2202/FLR-15
R-2203/FLR-15
R-2133/FRD
R-2131(V)3/GRR appears to be a Racal RA6775
R-1776/GSQ-174
R-1407
R-1279C/URR
R-1086/URR

Looking at all these numbers together precludes any mental recognition by me.  I did recognize an R-390A, but that was it.

Thanks & 73,
George
W5VPQ


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