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CTCSS-based Privacy Codes

FRS "Privacy Codes" or CTCSS
Codes are referred to by a number.  For instance, Privacy Code 38 is CTCSS Code 250.3 hz

For a more complete list, please visit the source of this information at
https://www.k0tfu.org/reference/frs-gmrs-privacy-codes-demystified/

CTCSS-based Privacy Codes

CTCSS adds a low frequency tone to the transmitted signal. By allowing a choice of the frequency of the tone, the radios make it so users on the same channel don’t have to listen to everyone else on that channel. There are more than 50 frequencies of tone that work for CTCSS, but 38 of them are commonly used on FRS or GMRS radios. The manufacturers assign a privacy code to each one of these 38 tone frequencies. And lucky for us, they mostly chose the same assignments.

On radios that have a way to specify CTCSS, like my Cobra HH450, you of course chose that squelch mode. On radios that just have a choice of privacy codes, like my Motorola TalkAbout MT351R, the first 38 privacy codes are CTCSS.

TONE	COBRA MIDLAND MOTOROLA UNIDEN	BAOFENG	CHEROKEE 465	MOTOROLA SPORT	RADIO SHACK
67.0	1	1	1		1
69.3		2	2
69.4					2
71.9	2	3	3		3
74.4	3	4	4		4
77.0	4	5	5	A	5
79.7	5	6	6		6
82.5	6	7	7		7
85.4	7	8	8		8
88.5	8	9	9	B	9
91.5	9	10	10		10
94.8	10	11	11		11
97.4	11	12	12	C	12
100.0	12	13	13		13
103.5	13	14	14		14
107.2	14	15	15	D	15
110.9	15	16	16		16
114.8	16	17	17		17
118.8	17	18	18	E	18
123.0	18	19	19		19
127.3	19	20	20	F	20
131.8	20	21	21		21
136.5	21	22	22	G	22
141.3	22	23	23		23
146.2	23	24	24		24
151.4	24	25	25		25
156.7	25	26	26		26
159.8		27	27		27
162.2	26	28	28		28
165.5		29			29
167.9	27	30	29		30
171.3		31			31
173.8	28	32	30		32
177.3		33*			33
177.8		33*
179.9	29	34	31		34
183.5		35	32		35
186.2	30	36	33		36
189.9		37	34		37
192.8	31	37	35		38
196.6		39	36
199.5		40	37
203.5	32	41	38
206.5		42	39
210.7	33	43	40
218.1	34	44	41
225.7	35	45	42
229.1		46	43
233.6	36	47	44
241.8	37	48	45
250.3	38	49	46
254.1		50	47

Note that some radios use the tone frequency as the CTCSS setting, not a code number. The Jetstream JT270M works this way.

Some Baofeng radios use 177.3 Hz for CTCSS tone 33, some Baofeng radios use 177.8 Hz for CTCSS tone 33. Best to just avoid CTCSS tone 33 on the Baofeng.

NVIS Links

Here are some links for NVIS Antenna information.

http://www.w0ipl.net/ECom/NVIS/nvis.htm