DCS SELCAL

DCS stands for Digital Coded Squelch (also known as DCSS, Digitally Coded Squelch Signaling), and is used for selective calls and remote control applications.

Parameter	Value
Frequency range	VHF
Operation modes	Digital Selcal
Modulation	FSK
Symbol rate	133.7,134.4, 137 Bd
Receiver settings	FM, BW = 15kHz
Input format(s)	IF

The data is transmitted on sub audible tones within the frequency range 2 Hz to 300 Hz. In practice, DCS is similar to CTCSS, but uses 104 octal 3-digit code words instead of continuous analogue tones.

The data is sent as a series of 23-bit GOLAY encoded frames without any sync bits. Polarity can be normal or inverse, and must be selected by the user.

DCS Code Table

Normal	Inverse	Normal	Inverse	Normal	Inverse	Normal	Inverse
023	047	155	731	325	526	516	432
025	244	156	265	331	465	523	246
026	464	162	503	332	455	526	325
031	627	165	251	343	532	532	343
032	051	172	036	346	612	546	132
036	172	174	074	351	243	565	703
043	445	205	263	356	212	606	631
047	023	212	356	364	131	612	346
051	032	223	134	365	125	624	632
053	452	225	122	371	734	627	031
054	413	226	411	411	226	631	606
065	271	243	351	412	143	632	624
071	306	244	025	413	054	654	743
072	245	245	072	423	315	662	466
073	506	246	523	431	723	664	311
074	174	251	165	432	516	703	565
114	712	252	462	445	043	712	114
115	152	255	446	446	255	723	431
116	754	261	732	452	053	731	155
122	225	263	205	454	266	732	261
125	365	265	156	455	332	734	371
131	364	266	454	462	252	743	654
132	546	271	065	464	026	754	116
134	223	274	145	465	331
143	412	306	071	466	662
145	274	311	664	503	162
152	115	315	423	506	073