United States Forest Service (CA)

Angeles National Forest

Radio System

The Angeles National Forest (ANF) radio system is comprised of 14 repeater sites situated on various mountain peaks in and around the forest which are linked to the dispatch center at Fox Field near Palmdale. Each repeater site functions as both a repeater and as a receiving antenna for dispatch.

Each repeater operates on the same input/output frequency pairs but uses a different CTCSS tone on the input. By selecting different tones users may activate different repeaters, choosing the one best suited to their location and communication needs. When a user activates a repeater by keying up on the appropriate input frequency and tone, their transmission is repeated only by that repeater. Other repeaters in the forest do not repeat transmissions from other repeaters.

When users transmit on one of the direct administrative channels their transmission can be received by any of the 14 repeater sites and relayed to dispatch, regardless of their location. On the other hand, if users transmit on one of the repeated administrative channels the CTCSS tone in use must match a repeater within range or their transmission will be lost.

Tone	Location	CTCSS
1	Waterman Mtn.	110.9
2	Santiago Pk.	123.0
3	Mt. Hawkins	131.8
4	Frost Pk.	136.5
5	Table Mtn.	146.2
6	Oat Mtn.	156.7
7	Josephine Pk.	167.9
8	Frasier Pk.	103.5
9	Pine Mtn.	100.0
10	Burnt Pk.	107.2
11	Magic Mtn.	114.8
12	Mt. Lukens	127.3
13	Johnstone Pk.	141.3
14	Grass Mtn.	151.4

The nature of Bendix King radios used by the Forest Service is such that users may select a CTCSS tone by selecting a number on the radio's keypad. As a result, most users refer to the CTCSS tone by its number (e.g., "tone 9" instead of Pine Mountain or 100.0 Hz).