Wavecom W61PC V7.5.0 - Manual (Page 174)

164  Transmission Modes WAVECOM Decoder W61PC/LAN Manual V7.5
If you select a FSK or PSK demodulator in Bitstream Output or Autocorrelation mode, then signal polarity
definition is available.
Pressing Change Order will reverse the polarity of the signal and pressing Default ST will restore the de-
fault value.
Symbol Definition ” on page 35.
ICAO SELCAL
ICAO selective calling was initially defined in 1985 using twelve tones (Tones "A" to "M", but without tone
"I"). In 1994 the ICAO calling system, also known as ANNEX10, was extended with the additional tones
"P", "Q", "R" and "S" and now operates with 16 tones.
Parameter Value
Frequency range HF
Operation modes Analogue Selcal
Symbol rate 1000 ms
Modulation USB
Receiver settings USB
Input format(s) AF, IF
The allocation of selective call addresses is exclusively managed by Aeronautical Radio, Inc. ARINC (ICAO
Designator Selcal Registry).
Each address consists of two pairs of tones, e.g. "AB-CD". Both pairs have a duration of 1,000 ms. Be-
tween each pair an interval of 200 ms is inserted. ICAO Selcal is used on all frequency bands (HF and
VHF/UHF).
ICAO Selcal Tone Allocation
Designation Frequency (Hz) Designation Frequency (Hz)
RED "A" 312.6 RED "J" 716.1
RED "B" 346.7 RED "K" 794.3
RED "C" 384.6 RED "L" 881.0
RED "D" 426.6 RED "M" 977.2
RED "E" 473.2 RED "P" 1083.9
RED "F" 524.8 RED "Q" 1202.3
RED "G" 582.1 RED "R" 1333.5
RED "H" 645.7 RED "S" 1479.1