This site has a very good list of various Soviet radios. Under each section are the names of the various radio sets. These all appear to be links to a more detailed page about those sets but they don't seem to mention weights and so on, (I haven't checked all of them).
The Soviets definitely had smaller radios than manpack types although some of them weren't exactly handheld and some were limited to only 6 channels or less.
http://www.armyradio.com/arsc/custom..._Mil_Radio.htm