ADVENTURE RADIO FREQUENCY - 146.580 MHz
The proposal is to use 146.580 MHz FM for the nationwide US adventure radio frequency. This frequency has been chosen because it is already in use in various regions of the US for hiking, backpacking, SOTA, overlanding and other outdoors activities. There is also a desire to avoid using 146.520 to remove outdoor activity traffic from the national calling frequency.
CTCSS TONES AND USAGE
CTCSS sub-audible tones are used to signal the type of traffic on the adventure radio frequency. The following CTCSS tones are assigned for various types of traffic. The Adventure Radio Protocol reserves all CTCSS tones between 67.0 Hz and 151.4 Hz to be assigned over time for various purposes. Radio operators can use any CTCSS frequency above 151.4 Hz for any purpose and are not governed by the AR protocol.
| Tone | Purpose |
|---|---|
| 67.0 Hz | Emergency calling. |
| 77.0 Hz | Ping - Keying up will cause any automated monitoring station to respond to let you know there is a system on the air. |
| 88.5 Hz | SOTA/POTA and other operating events. |
| 100.0 HZ | General backcountry conversations. |
| 123.0 Hz | Trigger automated messaging from local repeaters. |