General Information
The Post Office Code Standard Advisory Group (POCSAG) pager defines the format used to encode messages and the standards for message transmission.
Usage:
§ Pager in the VHF/UHF frequency range used by PTT administrations.
Mode Details
|
|
Item |
Value |
|
Standard |
Modulation |
FFSK |
|
|
Number of tones |
2 |
|
|
Symbol rate (Bd) |
512 / 1200 / 2400 |
|
|
Coding |
BCH(31,21) |
|
|
Alphabet |
ITA-5 |
|
Demodulator Settings |
Demodulator |
FSK2 matched |
|
|
Symbol rate (Bd) |
1200 |
|
|
SR tolerance (Bd) |
5 |
|
|
Shift (Hz) |
8500 |
|
|
Shift tolerance (Hz) |
500 |
|
|
Modem type |
Synchronous |
|
Features |
Demodulation |
yes |
|
|
Recognition |
yes |
|
|
Decoding |
yes |
|
|
Automatic Polarity Adjustment |
yes |
|
|
Combination with other modems (modem list) |
yes |
|
Tuning |
The tuning frequency is the center of the signal’s frequency range | |
Table 21: POCSAG
Figure 19: POCSAG Spectrogram