I doubt it...
A microwave source would dissipate by the time it reached any satellite. Certainly enough to avoid generating a considerable heat spike.
Radar couldn't generate that heat either.
Lasers since '69. USSR groundbased anti-sat research and facilities were "robust" already by 198-.
If this was mid-70's we're probably seeing the work of mischievious "Archangels."
;-)
SDAI-Tech1
