Rascal R6 300 Manual de usuario descargar pdf (Pagina 4)

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Other Modes - PSK63

• Designed for contest work

• Faster than RTTY on data rate and exchange -

100 wpm effective rate

• Better S/N than RTTY within 3db of PSK31

• Faster sync recovery than RTTY

• Much lower bandwidth than RTTY

• Full character set

• Look for signals 2.5 kHz higher than PSK31

Other Modes - MFSK16

• Multiple Frequency Shift Keying 16 Freqs.

• Four bits per tone

•250 Hz Wide

• Uses Forward Error Correction (FEC)

• Uses Varicode to optimize throughput

• Data rate consistent with that of a fast typist

• Adv: Very good performance on long path

contacts and over polar routes

• Disadv: Wider bandwidth, harder to tune,

needs stable TX/RX

MFSK16 Spectrogram

Spectrogram of MFSK16 signal over 20 seconds

of transmission. Horizonal lines are at 1000 Hz

and 1300 Hz. Contains about 120 characters raw

rate, 60 characters effective rate (FEC used).

Freq Hz

0 300

0 20

Time Sec

Comparison of Digital Modes

WPM Rates for Various Modes

Time Sec Char/Sec WPM QSO/3KHz

CW 20WPM 324 1.64 19.81 12

Feld Hell 170 3.12 37.76 9

BPSK31 125 4.25 51.36 30

RTTY 45.5Baud 117 4.54 54.87 9

MFSK 110 4.83 58.36 9

BPSK63 62 8.50 102.70 25

Based on a typical 2 way QSO exchanging

English text. 531 characters, 107 words and

spaces. I.E. average 6 characters per word.

MixW Screen with MFSK Signals

1 2 3 4 5 6

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