Icom IC-02, 03 and 04 enhanced tone squelch board

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Back to Home Icom IC-02, 03, 04, H12 and U16 enhanced tone squelch board
Research by Jeff Kincaid W6JK
HTML'd by Mike Morris WA6ILQ

This board offers tone decode as well as tone encode. On these radios the original push-in / push-out backlight switch on the top of the radio becomes a "PL Disable" switch (in for carrier squelch, out for PL). On the side of the stock radio there is a "Shift" button, and a double PTT button. The enhanced PL board commandeers the upper PTT button to run the backlight. So now from top to bottom you have Shift, Backlight, and PTT on the side where previously it was Shift, PTT, and more PTT.

The data for this table was developed by setting each tone number into the radio and reading the encoded tone using another radio. Decode was tested the same way.

Freq	Code	Normal Code	This Board
67.0	XZ	1
69.4	WZ
71.9	XA	2	31
74.4	WA	3
77.0	XB	4	30
79.7	WB*	5
82.5	YZ	6	29
85.4	YA	7
88.5	YB	8	28
91.5	ZZ	9
94.8	ZA	10	27
97.4	ZB	11
100.0	1Z	12	26
103.5	1A	13	25
107.2	1B	14	24
110.9	2Z	15	23
114.8	2A	16	22
118.8	2B	17	21
123.0	3Z	18	20
127.3	3A	19	19
131.8	3B	20	18
136.5	4Z	21	17
141.3	4A	22	16
146.2	4B	23	15
151.4	5Z	24	14
156.7	5A	25	13
162.2	5B	26	12
167.9	6Z	27	11
173.8	6A	28	10
179.9	6B	29	9
186.2	7Z	30	8
192.8	7A	31	7
203.5	M1	32	6
206.5	8Z
210.7	M2		5
218.1	M3		4
225.7	M4		3
229.1	9Z
233.6	M5		2
241.8	M6		1
250.3	M7
254.1	0Z*

Notes:
WB*: On some tone charts the label "WB" is replaced with "SP".
0Z*: That's a zero, then the letter "Z".

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The information presented in and on these conversion pages is © Copyrighted 1995 - (date of last update) by Kevin Custer W3KKC and multiple originating authors.