Difference between revisions of "Family Radio Service"

Revision as of 16:32, 16 October 2008

The Family Radio Service, or FRS, is an unlicensed, simplex only, personal radio service in the US covered by Part 95 of the FCC's regulations. Hand-held FRS transceivers with a maximum output of 500 mW are typically used by families, children, and campers to communicate. Shopping malls, theme parks, and special events are all great locations to monitor FRS communications. Radios may not have external antennas or power amplifiers attached to them (See 47 CFR 95.194c).

GMRS users may also communicate with FRS users, and among each other, on the lower 7 channels in the 462 MHz range, with a maximum of 5 watts ERP on those channels.

Frequencies

Channel Frequency	GMRS
01    	462.5625     	*
02    	462.5875     	*
03    	462.6125     	*
04    	462.6375     	*
05    	462.6625     	*
06    	462.6875     	*
07    	462.7125	*
08    	467.5625
09    	467.5875
10    	467.6125
11    	467.6375
12    	467.6625
13    	467.6875
14    	467.7125

Midland has started marketing "Extra Channels" on several of their radios. These extra channels are simply existing FRS/GMRS frequencies with hard coded tones. (See Below)

MIDLAND CH	FREQ	FRS/GMRS CH	TONE	MIDLAND TONE NUMBER
23	462.5625	1	250.3	38
24	462.6125	3	225.7	35
25	462.6625	5	203.5	32
26	462.7125	7	179.9	29
27	462.5500	15	162.2	26
28	462.6000	17	146.2	23
29	462.6500	19	131.8	20
30	462.7000	21	118.9	17
31	462.5875	2	23 DCS	1
32	466.6375	4	31 DCS	4
33	462.6875	6	47 DCS	7
34	467.5625	8	65 DCS	10
35	467.6125	10	73 DCS	13
36	467.6625	12	115 DCS	16
37	467.7125	14	131 DCS	19
38	462.5750	16	143 DCS	22
39	462.6250	18	156 DCS	25
40	462.6750	20	172 DCS	28
41	462.7250	22	223 DCS	31
42	462.5625	1	107.2	14

Recognized Channels

Some groups try to consistently use the same channel/tone combinations. See below for tone equivalents.

01/CS - "Emergency"
11/22 - Birders (no roger beep, please)
14/38 - MilCom/Airshow Hobbyists (7/15 - backup)

CTCSS

Most FRS radios have CTCSS capability. The companies marketing the radios usually refer to these tones as "privacy codes" even though they provide no privacy. Instead of asking FRS users to understand the actual tone values, integers are used instead. Most, but not all, manufacturers use the same numbers as Motorola:

Actual CTCSS tone	Commonly assigned "code"
67.0	1
71.9	2
74.4	3
77.0	4
79.7	5
82.5	6
85.4	7
88.5	8
91.5	9
94.8	10
97.4	11
100.0	12
103.5	13
107.2	14
110.9	15
114.8	16
118.8	17
123.0	18
127.3	19
131.8	20
136.5	21
141.3	22
146.2	23
151.4	24
156.7	25
162.2	26
167.9	27
173.8	28
179.9	29
186.2	30
192.8	31
203.5	32
210.7	33
218.1	34
225.7	35
233.6	36
241.8	37
250.3	38

@@ Line 22: / Line 22: @@
 See also [[FRS/GMRS combined channel chart]]
-Midland has started marketing "Extra Channels" on several of their radios.  These extra channels are simply existing FRS/GMRS frequencies with hard coded tones.
+Midland has started marketing "Extra Channels" on several of their radios.  These extra channels are simply existing FRS/GMRS frequencies with hard coded tones. (See Below)
+{| border="1" cellpadding="1"
+!MIDLAND CH !! FREQ !! FRS/GMRS CH !! TONE !! MIDLAND TONE NUMBER
+|-
+|23||462.5625||1||250.3||38
+|-
+|24||462.6125||3||225.7||35
+|-
+|25||462.6625||5||203.5||32
+|-
+|26||462.7125||7||179.9||29
+|-
+|27||462.5500||15||162.2||26
+|-
+|28||462.6000||17||146.2||23
+|-
+|29||462.6500||19||131.8||20
+|-
+|30||462.7000||21||118.9||17
+|-
+|31||462.5875||2||23 DCS||1
+|-
+|32||466.6375||4||31 DCS||4
+|-
+|33||462.6875||6||47 DCS||7
+|-
+|34||467.5625||8||65 DCS||10
+|-
+|35||467.6125||10||73 DCS||13
+|-
+|36||467.6625||12||115 DCS||16
+|-
+|37||467.7125||14||131 DCS||19
+|-
+|38||462.5750||16||143 DCS||22
+|-
+|39||462.6250||18||156 DCS||25
+|-
+|40||462.6750||20||172 DCS||28
+|-
+|41||462.7250||22||223 DCS||31
+|-
+|42||462.5625||1||107.2||14
+|}
 == Recognized Channels ==

Difference between revisions of "Family Radio Service"

From The RadioReference Wiki

Revision as of 16:32, 16 October 2008

Contents

Frequencies

Recognized Channels

CTCSS

See also