1. (noun) 3 to 30 megahertz

• hf

2. (noun) a pitch that is perceived as above other pitches

• high pitch

1. (noun) 3 to 30 megahertz

• radio frequency

2. (noun) a pitch that is perceived as above other pitches

• pitch

1. (noun) a pitch that is perceived as above other pitches

• low frequency
• low pitch