CTCSS / PL tone — A sub-audible tone that opens a repeater.
A low tone sent under your voice. If a repeater will not respond to you, a missing or wrong tone is the most likely reason.
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Related words
- Simplex vs duplex — One frequency versus two.
- Sporadic E — Sudden short-lived openings.
- Offset — The gap between transmit and receive frequency.
- CW — Continuous Wave. Morse code.
- APRS — Automatic Packet Reporting System.
- FT8 — A weak-signal digital mode.
- SWR — Standing Wave Ratio.
- Frequency — How fast a radio wave oscillates.