Sorry I haven't got a definitive answer but I have a little bit of help.
The R-392 and R-392A replaced the R-126 in the 1980s and appear to be something of an upgrade of that earlier radio set. Given that the R-126 weighs in at just 2.8kg, you could argue that the R-392 weighs about the same (maybe somewhere between 3 and 4 kilograms even).
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