Wavecom W-SPECTRA (Automatic Monitoring System) V1.1.0 Manuel d'utilisateur télécharger pdf (Page 106)

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Transmission Modes WAVECOM Monitoring System W-SPECTRA, W-SPEED Manual V1.1.0

If errors are received the two last 32 bit blocks are retransmitted when the radio channel rate is 125 Baud

and three blocks when working at 250 Baud.

Like DUP-ARQ-2, DUP-FEC-2 has many special blocks for IDLE and RQ.

DZVEI

The entire call number is transmitted by consecutive tones in decade sequence. When two identical digits

are to be transmitted consecutively, then an eleventh frequency is used as a repetition identifier.

Parameter

Value

Frequency range

VHF/UHF

Operation modes

Analogue Selcal

Modulation

FM, SUB Tones

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.

For ZVEI modes having nominal tone durations of 70 ms, the duration of a single tone may vary ± 15 ms.

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 enabled

to add date and time to each call.

Tone Allocation

Digit

2200

1830

970

2000

1060

825

1160

740

1270

2600

1400

885

1530

2400

1670

680

Tone duration: 70 ms.

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