Wavecom W61PC V7.5.0 - Manual (Page 208)

198  Transmission Modes WAVECOM Decoder W61PC/LAN Manual V7.5
Parameter Value
Frequency range VHF/UHF
Operation modes Analogue Selcal
Modulation FM, SUB tone
Receiver settings FM, BW = 12 kHz
Input format(s) AF, IF
If more than two identical digits are to be transmitted, the repetition tone is appended to the digit tone
(e.g. 22222 is transmitted as f2 fw f2 fw f2, where f2 is the tone for "2" and fw is the repetition tone).
In most systems the accuracy of the single frequencies has to be within +1/-1.5% of the nominal value.
Decoding the selective calls is started by clicking on a system. If transmission and system selection con-
form, the call sign is displayed on the monitor. In the Options menu a Time stamp function can be ena-
bled to add date and time to each call.
Tone Allocation
Digit Hz Digit Hz
0 2200 8 1830
1 970 9 2000
2 1060 A 825
3 1160 B 886
4 1270 C 2600
5 1400 D 856
6 1530 E 2400
7 1670 F 680
Tone duration: 70 ms
PICCOLO-MK6 and PICCOLO-MK12
PICCOLO-MK6 and PICCOLO-MK12 are MFSK (multi frequency shift keying) systems. The earlier PICCOLO
versions MK1, MK2 and MK3 used 34 or 40 tones, each tone representing one character of the ITA-2 or
ITA-5 alphabet respectively.
Parameter Value
Frequency range HF
Operation modes Simplex
Modulation MFSK-6, MFSK-12
Speed 50 ms, 25 ms
Receiver settings DATA, CW, LSB or USB
Input format(s) AF, IF
Additional Info ITA-2 for MK6, ITA-5 for MK12
The tone duration was 100 ms and the tone spacing 10 Hz.
Recent systems operate with two sequential tones. The combination of the two tones defines the transmit-
ted character. An increase in the signal-to-noise ratio is achieved by this method.