- 73
- 73 magazine
- 88
- A/B switch
- A index
- active noise control
- active noise reduction
- ALC
- amateur radio direction finding
- ANC
- ANR
- antenna selector
- ARDF
- auto tuner
- automatic level control
- B
- Backscatter
- baud
- Bd
- bel
- boomset
- bunny hunt
- Call Sign
- E Region
- EME
- F-Region
- F2 Layer
- Field Day
- Geomagnetic activity
- Ionosphere
- K index
- Maximum Usable Frequency
- MUF
- SFU
- Solar Cycle
- Solar Flares
- Solar Flux
- Solar Wind
- Sporadic E
- SSN
- Sunspot
- Sunspot Number