General Information
This standard is a system with 14 tones where only 13 tones
are used. The carrier is AM modulated with a secondary MFSK modulation for the
data.
SP-14 is equivalent to NUM-13.
Usage:
§ Transmission of numeric codes.
Mode Details
|
|
Item |
Value |
|
Standard |
Modulation, primary, secondary |
AM, MFSK |
|
|
Number of tones |
14 |
|
|
Tone length (ms) |
133 |
|
|
Tone spacing (Hz) |
16 |
|
|
Bandwidth (Hz) |
210 |
|
|
Symbol rate (Bd) |
7.5 |
|
|
Coding |
Character coding |
|
Demodulator Settings |
Demodulator |
Multitone (MFSK) |
|
|
Tone duration (ms) |
133 |
|
|
TD tolerance (ms) |
5 |
|
|
No. of tones |
14 |
|
|
Tone position type |
Equidistant frequencies |
|
|
Tone distance (Hz) |
16 |
|
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 | |
Table 201: SP14
Figure 69: SP14 Spectrogram