- resolution
- resolution filter
- resolving cell
- resonant antenna
- resonant condition
- resource definition
- resource identifier
- resource pool
- responder beacon
- response authority
- response time
- restart condition
- restore icon
- restricted service
- resultant field
- resynchronize
- retention date
- resonator-grid
- resource security
- response unit
- rest frequency
- restart instruction
- restart sequence
- restarting point
- resting frequency
- retractable aerial
- retrain positive
- retrieval engine
- retrieval service
- retro-sequence
- return routine
- revenue account
- reverberation time
- reversals
- RF section
- rhombic avtenna
- rice function
- rieke diagram
- right ascension
- reverse break
- reverse emission
- revision
- rewind
- rhombic antenna
- ring structure
- ringer
- ringing current
- ringing duration
- ringing period
- ringing time
- ripple factor
- risk area
- retirement
- retrain negative
- retransmission site
- retuning
- return channel
- return code
- return loss
- reverberation room
- revolver track
- RF carrier
- RF transistor
- rhombic aerial
- rhombus array
- rhumbtron
- residual modulation
- residual noise
- residue series
- resist
- resistance attenurator
- resistive attenuator
- resistor-capacitor
- resolving power
- resonant range
- resorcin
- retirement age
- retirement benefit
- retroactive adjustment
- retroactive payments
- return period
- ring
- ring accelerometer
- ring antenna
- ring configuration
- ring connection
- ring wire
- ringing circuit
- ringing machine
- ripple attenuation
- risk management
- revaluation
- RF amplification
- RF oscillator
- RF stage
- rhyme tests
- right angle
- roaming subscriber
- rocket antenna
- rocket engine