NATEL

General Information

The NATEL SelCal standard was defined by the Scandinavian National Telephone.

Usage:

§ Narrowband FM SelCal system in the VHF/UHF frequency range.

Mode Details

 

Item

Value

Standard

Modulation

Multitone

 

Number of tones

16

 

Coding

Character coding

Demodulator Settings

Demodulator

Analogue SelCal

 

Tone duration (ms)

70

 

TD tolerance (ms)

15

 

No. of tones

16

 

SELCAL type

NATEL

 

Min. burst length (s)

0.280

 

Max. burst length (s)

1.000

 

Min. pause length (s)

0.070

 

Min. burst SNR (dB)

3

Features

Demodulation

yes

 

Recognition

yes

 

Decoding

yes

 

Automatic Polarity Adjustment

no

 

Combination with other modems (modem list)

yes

Tuning

The tuning frequency is the center of the signal’s frequency range

Table 18: NATEL

Figure 16: NATEL Spectrogram