POCSAG

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POCSAG
POCSAG Waterfallthmb.png
Frequencies 25 MHzMegaHertz (MHz) 10^6 Hz25,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
25,000 kHzKiloHertz (kHz) 10^3 Hz
,932 MHzMegaHertz (MHz) 10^6 Hz932,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
932,000 kHzKiloHertz (kHz) 10^3 Hz
25,000 kHzKiloHertz (kHz) 10^3 Hz
25 MHzMegaHertz (MHz) 10^6 Hz
932,000 kHzKiloHertz (kHz) 10^3 Hz
932 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range 25 MHzMegaHertz (MHz) 10^6 Hz25,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
25,000 kHzKiloHertz (kHz) 10^3 Hz
- 932 MHzMegaHertz (MHz) 10^6 Hz932,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
932,000 kHzKiloHertz (kHz) 10^3 Hz
Mode NFMNarrowband Frequency Modulation
Modulation FSKFrequency-Shift Keying
ACF
Bandwidth 9000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).kHzKiloHertz (kHz) 10^3 Hz
0.009 MHzMegaHertz (MHz) 10^6 Hz
kHzKiloHertz (kHz) 10^3 Hz
0.009 MHzMegaHertz (MHz) 10^6 Hz
kHzKiloHertz (kHz) 10^3 Hz
0.009 MHzMegaHertz (MHz) 10^6 Hz
Location Worldwide
Short Description POCSAG (Post Office Code Standardisation Advisory Group), also known as Super-POCSAG, Radio Paging Code No. 1 or RPC1, is a one-way 2FSK paging protocol that supports 512, 1200, and 2400 bpsBits per second (bps).
I/Q Raw Recording Download file
Audio Sample
POCSAG (Post Office Code Standardisation Advisory Group), also known as Super-POCSAG, Radio Paging Code No. 1 or RPC1, is a one-way 2FSK paging protocol that supports 512, 1200, and 2400 bpsBits per second (bps). POCSAG transmissions of different speeds and different paging protocols (e.g. FLEX) on the same paging channel are supported. POCSAG's official designation is "CCIRComité Consultatif International pour la Radio (Predecessor of the ITU-R) Recommendation 584, Radio Paging Code No. 1".

The Post Office Code Standardisation Advisory Group (POCSAG) was from the British Post Office, which used to run nearly all telecommunications in Britain before privatization.

Characteristics[edit]

POCSAG supports tone, numeric, and alphanumeric data transmission. POCSAG cannot transmit binary data. POCSAG has three speeds, 512 bpsBits per second (bps), 1200 bpsBits per second (bps), and 2400 bpsBits per second (bps). all three use FSKFrequency-Shift Keying modulation.

The 512 bpsBits per second (bps) mode was the original and standard POCSAG speed mode. Faster modes constituted the upgraded version, Super-POCSAG, which supported 1200 bpsBits per second (bps) and 2400 bpsBits per second (bps) speeds.


The modulation used is FSKFrequency-Shift Keying with a ±4.5 kHzKiloHertz (kHz) 10^3 Hz shift on the center carrier. The frequency at +4.5 kHzKiloHertz (kHz) 10^3 Hz represents a 0 where the -4.5 kHzKiloHertz (kHz) 10^3 Hz represents a 1.

Samples[edit]

In the following sound file first is a POCSAG 512 sound then the second is POCSAG 1200.


Each of POCSAG's 3 speed modes:
POCSAG 512
POCSAG 1200
POCSAG 2400

Frequencies[edit]

Note: In many of these regions, the paging frequencies and bands listed below are shared with other radio services, including land mobile two-way radio. In some areas of the United States, the VHFVery High Frequency (30-300 MHz)/UHFUltra High Frequency (300-3000 MHz) paging bands listed below are used for land mobile communications. The low-band 35 MHzMegaHertz (MHz) 10^6 Hz/43 MHzMegaHertz (MHz) 10^6 Hz frequencies and 929-931 MHzMegaHertz (MHz) 10^6 Hz frequencies are exclusively allocated to the paging services in the USA. In the United States, 27.255 MHzMegaHertz (MHz) 10^6 Hz is available for unlicensed paging and telemetry services under Part 95 of the FCC rules (sections 95.207 and 95.210) on a shared basis with the CB radio service. The UHFUltra High Frequency (300-3000 MHz) (454-467 MHzMegaHertz (MHz) 10^6 Hz) allocations are often "interleaved" with land mobile services. For example, 462.850 MHzMegaHertz (MHz) 10^6 Hz is used for paging, while adjacent frequencies 462.8375 MHzMegaHertz (MHz) 10^6 Hz and 462.8625 MHzMegaHertz (MHz) 10^6 Hz are used for low-power business radio service communications. Same goes for the "high side" of those allocations. 467.750 MHzMegaHertz (MHz) 10^6 Hz is often used for low-power on-site paging in restaurants, etc, while 467.7625 MHzMegaHertz (MHz) 10^6 Hz is a heavily used low-power business radio service frequency. Target Stores (USA) often use the 467.xxx frequencies for in-store voice communications. 467.750 MHzMegaHertz (MHz) 10^6 Hz, 467.775 MHzMegaHertz (MHz) 10^6 Hz and 467.800 MHzMegaHertz (MHz) 10^6 Hz are the most commonly seen. Some systems use the same frequency for voice and POCSAG paging.

In Europe the 26-28 MHzMegaHertz (MHz) 10^6 Hz region is heavily populated by land mobile, Citizen's Band (CB) and telemetry traffic in addition to paging systems. The 26.225-26.935 MHzMegaHertz (MHz) 10^6 Hz European band is shared with CB in Germany, the Czech Republic, Russia and elsewhere.

In Ireland and the UK, the 26.96-28.0 MHzMegaHertz (MHz) 10^6 Hz band is used for Church radio/religious broadcasting services (Wireless Public Address Service - WPAS in Ireland, Community Audio Distribution Service - CADS in the UK) in addition to CB and specialized paging services.

POCSAG Frequency Ranges
Paging Band Frequency Range
HFHigh Frequency (3-30 MHz)-High/VHFVery High Frequency (30-300 MHz)-Low Band 25 MHzMegaHertz (MHz) 10^6 Hz - 54 MHzMegaHertz (MHz) 10^6 Hz
VHFVery High Frequency (30-300 MHz) Mid Band 66 MHzMegaHertz (MHz) 10^6 Hz - 88 MHzMegaHertz (MHz) 10^6 Hz
VHFVery High Frequency (30-300 MHz) High Band 138 MHzMegaHertz (MHz) 10^6 Hz- 175 MHzMegaHertz (MHz) 10^6 Hz
UHFUltra High Frequency (300-3000 MHz) 406 MHzMegaHertz (MHz) 10^6 Hz - 422 MHzMegaHertz (MHz) 10^6 Hz
UHFUltra High Frequency (300-3000 MHz) High 435 MHzMegaHertz (MHz) 10^6 Hz - 512 MHzMegaHertz (MHz) 10^6 Hz
'900' Band 929 MHzMegaHertz (MHz) 10^6 Hz - 932 MHzMegaHertz (MHz) 10^6 Hz

POCSAG Frequencies by Region

Frequency Location
26.200 MHzMegaHertz (MHz) 10^6 Hz - 27.995 MHzMegaHertz (MHz) 10^6 Hz Europe-wide (shared with CB and other services)
47.000 MHzMegaHertz (MHz) 10^6 Hz - 47.250 MHzMegaHertz (MHz) 10^6 Hz European Union Standardized
169.400 MHzMegaHertz (MHz) 10^6 Hz - 169.800 MHzMegaHertz (MHz) 10^6 Hz European Union Standardized
26.230 MHzMegaHertz (MHz) 10^6 Hz - 26.870 MHzMegaHertz (MHz) 10^6 Hz (odd steps, 25 kHzKiloHertz (kHz) 10^3 Hz wide channels) UK Medical
31.725 MHzMegaHertz (MHz) 10^6 Hz - 31.775 MHzMegaHertz (MHz) 10^6 Hz (25 kHzKiloHertz (kHz) 10^3 Hz steps) UK Medical
49.000 MHzMegaHertz (MHz) 10^6 Hz - 49.4125 MHzMegaHertz (MHz) 10^6 Hz (12.5 kHzKiloHertz (kHz) 10^3 Hz steps) UK On-Site
49.425 MHzMegaHertz (MHz) 10^6 Hz - 49.475 MHzMegaHertz (MHz) 10^6 Hz (12.5 kHzKiloHertz (kHz) 10^3 Hz steps) UK Medical
49.4875 MHzMegaHertz (MHz) 10^6 Hz UK On-Site
138 MHzMegaHertz (MHz) 10^6 Hz UK
153 MHzMegaHertz (MHz) 10^6 Hz - 153.5 MHzMegaHertz (MHz) 10^6 Hz UK
159.6375 MHzMegaHertz (MHz) 10^6 Hz - 159.700 MHzMegaHertz (MHz) 10^6 Hz (12.5 kHzKiloHertz (kHz) 10^3 Hz steps) UK Medical
161.000 MHzMegaHertz (MHz) 10^6 Hz - 161.125 MHzMegaHertz (MHz) 10^6 Hz (12.5 kHzKiloHertz (kHz) 10^3 Hz steps) UK Medical
164.200 MHzMegaHertz (MHz) 10^6 Hz UK Medical
454 MHzMegaHertz (MHz) 10^6 Hz UK
459 MHzMegaHertz (MHz) 10^6 Hz UK
173 MHzMegaHertz (MHz) 10^6 Hz Germany Fire/Rescue
466.075 MHzMegaHertz (MHz) 10^6 Hz Germany Public
465.970 MHzMegaHertz (MHz) 10^6 Hz Germany Public
169.625 MHzMegaHertz (MHz) 10^6 Hz Belgium
26.175 MHzMegaHertz (MHz) 10^6 Hz - 28.000 MHzMegaHertz (MHz) 10^6 Hz Ireland Private Low Power (On-Site Only, shared with CB and WPAS)
30.000 MHzMegaHertz (MHz) 10^6 Hz - 37.500 MHzMegaHertz (MHz) 10^6 Hz (25 kHzKiloHertz (kHz) 10^3 Hz steps) Ireland Hospital (ETS 300.224 Specification)
153 MHzMegaHertz (MHz) 10^6 Hz - 154 MHzMegaHertz (MHz) 10^6 Hz Ireland Wide Area
458.500 MHzMegaHertz (MHz) 10^6 Hz - 459.500 MHzMegaHertz (MHz) 10^6 Hz Ireland Private (On-Site)
26.200 MHzMegaHertz (MHz) 10^6 Hz - 26.500 MHzMegaHertz (MHz) 10^6 Hz (25 kHzKiloHertz (kHz) 10^3 Hz steps) Italy Medical
40.0125 MHzMegaHertz (MHz) 10^6 Hz - 40.0875 MHzMegaHertz (MHz) 10^6 Hz (25 kHzKiloHertz (kHz) 10^3 Hz steps) Italy Medical
169.650 MHzMegaHertz (MHz) 10^6 Hz The Netherlands (P2000 - Medical)
172.450 MHzMegaHertz (MHz) 10^6 Hz The Netherlands (KPN 3 - Public)
27.255 MHzMegaHertz (MHz) 10^6 Hz USA Unlicensed Part 95 (up to 100w PEP, shared with CB Radio Channel 23)
35.200 MHzMegaHertz (MHz) 10^6 Hz - 35.260 MHzMegaHertz (MHz) 10^6 Hz (20 kHzKiloHertz (kHz) 10^3 Hz steps) USA
35.300 MHzMegaHertz (MHz) 10^6 Hz - 35.540 MHzMegaHertz (MHz) 10^6 Hz (40 kHzKiloHertz (kHz) 10^3 Hz steps) USA
35.560 MHzMegaHertz (MHz) 10^6 Hz - 35.660 MHzMegaHertz (MHz) 10^6 Hz (20 kHzKiloHertz (kHz) 10^3 Hz steps) USA
43.200 MHzMegaHertz (MHz) 10^6 Hz - 43.260 MHzMegaHertz (MHz) 10^6 Hz (20 kHzKiloHertz (kHz) 10^3 Hz steps) USA
43.300 MHzMegaHertz (MHz) 10^6 Hz - 43.540 MHzMegaHertz (MHz) 10^6 Hz (40 kHzKiloHertz (kHz) 10^3 Hz steps) USA
43.560 MHzMegaHertz (MHz) 10^6 Hz - 43.660 MHzMegaHertz (MHz) 10^6 Hz (20 kHzKiloHertz (kHz) 10^3 Hz steps) USA
72.020 - 72.980 MHzMegaHertz (MHz) 10^6 Hz (20 kHzKiloHertz (kHz) 10^3 Hz steps) USA
75.460 - 75.980 MHzMegaHertz (MHz) 10^6 Hz (20 kHzKiloHertz (kHz) 10^3 Hz steps) USA
152.0075 MHzMegaHertz (MHz) 10^6 Hz USA Medical/Emergency
152.030 MHzMegaHertz (MHz) 10^6 Hz - 152.270 MHzMegaHertz (MHz) 10^6 Hz (30 kHzKiloHertz (kHz) 10^3 Hz steps) USA
152.480 MHzMegaHertz (MHz) 10^6 Hz - 152.840 MHzMegaHertz (MHz) 10^6 Hz (30 kHzKiloHertz (kHz) 10^3 Hz steps) USA
154.625 MHzMegaHertz (MHz) 10^6 Hz USA On-Site Business Paging
154.640 MHzMegaHertz (MHz) 10^6 Hz USA On-Site Business Paging
157.450 MHzMegaHertz (MHz) 10^6 Hz USA Medical/Emergency
157.480 MHzMegaHertz (MHz) 10^6 Hz - 158.670 MHzMegaHertz (MHz) 10^6 Hz (30 kHzKiloHertz (kHz) 10^3 Hz steps) USA
158.700 MHzMegaHertz (MHz) 10^6 Hz USA
163.250 MHzMegaHertz (MHz) 10^6 Hz USA Medical/Emergency
454.025 MHzMegaHertz (MHz) 10^6 Hz - 454.325 MHzMegaHertz (MHz) 10^6 Hz (12.5 kHzKiloHertz (kHz) 10^3 Hz steps) USA
459.025 MHzMegaHertz (MHz) 10^6 Hz - 459.325 MHzMegaHertz (MHz) 10^6 Hz (12.5 kHzKiloHertz (kHz) 10^3 Hz steps) USA
462.750 MHzMegaHertz (MHz) 10^6 Hz - 462.9250 MHzMegaHertz (MHz) 10^6 Hz (25 kHzKiloHertz (kHz) 10^3 Hz steps) USA
467.750 MHzMegaHertz (MHz) 10^6 Hz - 467.9250 MHzMegaHertz (MHz) 10^6 Hz (12.5 kHzKiloHertz (kHz) 10^3 Hz steps) USA Low Power On-Site
465.000 MHzMegaHertz (MHz) 10^6 Hz USA
929.0125 MHzMegaHertz (MHz) 10^6 Hz - 929.9875 MHzMegaHertz (MHz) 10^6 Hz (25 kHzKiloHertz (kHz) 10^3 Hz steps) USA
931.0125 MHzMegaHertz (MHz) 10^6 Hz - 931.9875 MHzMegaHertz (MHz) 10^6 Hz (25 kHzKiloHertz (kHz) 10^3 Hz steps) USA
931.4375 MHzMegaHertz (MHz) 10^6 Hz Mexico
931.9375 MHzMegaHertz (MHz) 10^6 Hz Mexico
932.7825 MHzMegaHertz (MHz) 10^6 Hz Argentina (thanks PVM)
29.800 MHzMegaHertz (MHz) 10^6 Hz - 33.920 MHzMegaHertz (MHz) 10^6 Hz (10 kHzKiloHertz (kHz) 10^3 Hz steps) Canada
36.260 MHzMegaHertz (MHz) 10^6 Hz Canada (On-Site)
42.500 MHzMegaHertz (MHz) 10^6 Hz Canada
137 MHzMegaHertz (MHz) 10^6 Hz - 144 MHzMegaHertz (MHz) 10^6 Hz (15 kHzKiloHertz (kHz) 10^3 Hz steps) Canada (shared with other services)
148 MHzMegaHertz (MHz) 10^6 Hz - 151 MHzMegaHertz (MHz) 10^6 Hz (15 kHzKiloHertz (kHz) 10^3 Hz steps) Canada (shared with other services)
166 MHzMegaHertz (MHz) 10^6 Hz - 171 MHzMegaHertz (MHz) 10^6 Hz (15 kHzKiloHertz (kHz) 10^3 Hz steps) Canada (shared with other services)
415 MHzMegaHertz (MHz) 10^6 Hz - 422 MHzMegaHertz (MHz) 10^6 Hz (12.5 kHzKiloHertz (kHz) 10^3 Hz steps) Canada Medical (shared with other services)
465 MHzMegaHertz (MHz) 10^6 Hz - 466 MHzMegaHertz (MHz) 10^6 Hz (12.5 kHzKiloHertz (kHz) 10^3 Hz steps) Canada Medical (shared with other services)
29.725 MHzMegaHertz (MHz) 10^6 Hz - 29.995 MHzMegaHertz (MHz) 10^6 Hz (10 kHzKiloHertz (kHz) 10^3 Hz steps) Australia(shared with low power telemetry and R/C)
148.3375 MHzMegaHertz (MHz) 10^6 Hz Australia
450.375 MHzMegaHertz (MHz) 10^6 Hz Australia
26.978 MHzMegaHertz (MHz) 10^6 Hz New Zealand RP1A On-Site
27.003 MHzMegaHertz (MHz) 10^6 Hz New Zealand RP2A On-Site
27.028 MHzMegaHertz (MHz) 10^6 Hz New Zealand RP3A On-Site
27.053 MHzMegaHertz (MHz) 10^6 Hz New Zealand RP4A On-Site
27.078 MHzMegaHertz (MHz) 10^6 Hz New Zealand RP5A On-Site
27.103 MHzMegaHertz (MHz) 10^6 Hz New Zealand RP6A On-Site
27.137 MHzMegaHertz (MHz) 10^6 Hz New Zealand RP7A On-Site
27.162 MHzMegaHertz (MHz) 10^6 Hz New Zealand RP8A On-Site
27.187 MHzMegaHertz (MHz) 10^6 Hz New Zealand RP9A On-Site
27.212 MHzMegaHertz (MHz) 10^6 Hz New Zealand RP10A On-Site
27.237 MHzMegaHertz (MHz) 10^6 Hz New Zealand RP11A On-Site
27.262 MHzMegaHertz (MHz) 10^6 Hz New Zealand RP12A On-Site
31.325 MHzMegaHertz (MHz) 10^6 Hz - 31.575 (25 kHzKiloHertz (kHz) 10^3 Hz steps) New Zealand RP1B - RP11B On-Site
140.6375 MHzMegaHertz (MHz) 10^6 Hz New Zealand
157.900 MHzMegaHertz (MHz) 10^6 Hz - 158.100 MHzMegaHertz (MHz) 10^6 Hz (25 kHzKiloHertz (kHz) 10^3 Hz steps) New Zealand
160.3375 MHzMegaHertz (MHz) 10^6 Hz - 160.5875 MHzMegaHertz (MHz) 10^6 Hz (25 kHzKiloHertz (kHz) 10^3 Hz steps) New Zealand RP1C - RP11C On Site
458.550 MHzMegaHertz (MHz) 10^6 Hz New Zealand RP1D
458.600 MHzMegaHertz (MHz) 10^6 Hz New Zealand RP2D

Decoding Software[edit]

Hobby Level Software

Decoding Tutorials[edit]

Video Examples[edit]

Additional Links[edit]

Additional Images[edit]