Back one page Back to Home

Communications Specialists 5 Position Dip Switch Programming

Most Com-Spec devices that use a single 5 position DIP switch for tone selection are subaudible-only.   Other products have a jumper in addition to the 5‑bit DIP switch.   In those devices the jumper selects either the subaudible ("Group A") or the audible ("Group B") tones.

Field modifications are common - I've seen writeups on:

• Adding a toggle switch to add encoder disable/enable
• Replacing the Group A (subaudible) / Group B (audible) jumper with a switch
• Replacing the 5‑position DIP switch with a 6‑position and using the the extra postion to do the group select
• Replacing the 5‑position DIP switch with a 6‑position and using the the extra postion to switch off the encoder completely (either by switching the power on and off, or by grounding the tone output).   This mod was very common on the IC‑2AT, 3AT and 4AT handhelds.
• Replacing the 5‑position DIP switch with a 7‑position and doing both of the above.

The table below lists the subaudible tones (sometimes called the "Group A" tones).
Scroll down for the audible tones or click on the Group B table.

The Subaudible 32 Tone Five Bit Dip Switch Table
0 = zero = switch on or shorted = a logic low       1 = one = switch off or open = a logic high
#	Freq Hz.	Tone Code	Dip Switch position					Notes
			1	2	3	4	5
1	67.0	XZ	0	0	0	0	0
2	71.9	XA	1	0	0	0	0
3	74.4	WA	0	1	0	0	0
4	77.0	XB	1	1	0	0	0
5	79.7	SP	0	0	1	0	0
6	82.5	YZ	1	0	1	0	0
7	85.4	YA	0	1	1	0	0
8	88.5	YB	1	1	1	0	0
9	91.5	ZZ	0	0	0	1	0
10	94.8	ZA	1	0	0	1	0	This tone is not available in some older radios.
11	97.4	ZB	0	1	0	1	0
12	100.0	1Z	1	1	0	1	0	Probably the most common tone in the USA, but not recommended in areas with 50 Hz power.
13	103.5	1A	0	0	1	1	0
14	107.2	1B	1	0	1	1	0
15	110.9	2Z	0	1	1	1	0
16	114.8	2A	1	1	1	1	0
17	118.8	2B	0	0	0	0	1	These two tones are suggested to be the last used in areas with 60 Hz power as poorly designed decoders can false on 120 Hz hum. Good decoders have no problem.
18	123.0	3Z	1	0	0	0	1
19	127.3	3A	0	1	0	0	1
20	131.8	3B	1	1	0	0	1	These two tones not recomended on mixed mode (i.e. tone squelch and digital coded squelch) channels - see note.
21	136.5	4Z	0	0	1	0	1
22	141.3	4A	1	0	1	0	1
23	146.2	4B	0	1	1	0	1
24	151.4	5Z	1	1	1	0	1
25	156.7	5A	0	0	0	1	1
26	162.2	5B	1	0	0	1	1
27	167.9	6Z	0	1	0	1	1
28	173.8	6A	1	1	0	1	1
29	179.9	6B	0	0	1	1	1	This tone is 1/10 Hz off of the 3rd harmonic of 60 Hz. That can cause problems if you have any AC hum in a system.
30	186.2	7Z	1	0	1	1	1
31	192.8	7A	0	1	1	1	1
32	203.5	Ml	1	1	1	1	1
IC-107 Pins:			14	13	12	11	10
IC-110 Pins:			14	15	16	1	2

Note:
Digital PL / Digital Coded Squelch uses a clock rate of 134.4Hz, so it's a good idea to not use 131.8Hz / 3B or 136.5Hz / 4A on any mixed-mode channel.

Back to the top of the page
Back one page
Back to Home

The table below lists the audible tones (sometimes called the "Group B" tones).

The Audible 32 Tone Five Bit Dip Switch Table
0 = zero = switch on or shorted = a logic low       1 = one = switch off or open = a logic high
#	Freq Hz.	Dip Switch position					Common Usage
		1	2	3	4	5
1	600	0	0	0	0	0	common test tone
2	1000	0	0	0	0	1	most common test tone
3	1500	0	0	0	1	0	common test tone and tone burst
4	1600	0	0	0	1	1	uncommon tone burst
5	1650	0	0	1	0	0	uncommon tone burst, also mutes or selects receivers in multiple receiver tone remote stations
6	1700	0	0	1	0	1	uncommon tone burst
7	1750	0	0	1	1	0	most common tone burst, also mutes or selects receivers in multiple receiver tone remote stations
8	697	0	0	1	1	1	touchtone top row (1-2-3-A)
9	1800	0	1	0	0	0	uncommon tone burst
10	1850	0	1	0	0	1	Motorola tone remote F2 tone
11	1900	0	1	0	1	0	uncommon tone burst
12	770	0	1	0	1	1	touchtone second row (4-5-6-B)
13	1950	0	1	1	0	0	Motorola tone remote F1 tone GE Voting status tone
14	852	0	1	1	0	1	touchtone third row (7-8-9-C)
15	941	0	1	1	1	0	touchtone fourth row (star-zero-pound-D)
16	2000	0	1	1	1	1
17	2100	1	0	0	0	0
18	2160	1	0	0	0	1
19	2200	1	0	0	1	0
20	2250	1	0	0	1	1
21	2300	1	0	1	0	0
22	2350	1	0	1	0	1
23	2400	1	0	1	1	0
24	1209	1	0	1	1	1	touchtone first column (1-4-7-star)
25	2450	1	1	0	0	0
26	2500	1	1	0	0	1
27	2550	1	1	0	1	0
28	1336	1	1	0	1	1	touchtone second column (2-5-8-zero)
29	2175	1	1	1	0	0	Moto tone remote keying tone Moto Voting status tone
30	1477	1	1	1	0	1	touchtone third column 3-6-9-pound)
31	1633	1	1	1	1	0	touchtone fourth column (A-B-C-D)
32	2805	1	1	1	1	1	Secode®

For the sake of completeness on the Moto tone remotes 1350 Hz is used for frequency three (F3) select, 1250 to select frequency four (F4), 1450 Hz to set up a repeater, and 1550 Hz to knock down a repeater.   There is a card called a "wild card" that normally decodes 1350, 1250, 1150, and 1050 Hz, but in some circumstances will be found configured to other tones.

Back to the top of the page
Back one page
Back to Home

The data in the tables above was extracted from the documentation sheets packed with the products and is copyrighted by Communications Specialists.
Artistic layout and hand-coded HTML © Copyright 2004 and date of last update by repeater-builder.com.

This page originally posted on 09-Jul-2004.

This web page, this web site, the information presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of last update) by Kevin Custer W3KKC and multiple originating authors. All Rights Reserved, including that of paper and web publication elsewhere.