The Sights and Sounds of
Digital Modes
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images.
|
Mode |
DM780 |
Image |
Sound / |
Comments |
|
BPSK31 |
Yes |
|
The most commonly used of
the BPSK modes. Narrow bandwidth (31.5Hz) comes at the expense of speed
(about 50wpm). |
|
|
BPSK63 |
Yes |
|
Faster data transmission
than BPSK31 but greater bandwidth (63Hz). |
|
|
BPSK125 |
Yes |
|
Faster data transmission
than BPSK31 or BPSK63 but greatest bandwidth (125Hz). |
|
|
CW |
Yes |
|
CW and MCW result in the
same type of transmission. |
|
|
DominoEx‑4 |
Yes |
|
DominoEx-4 uses 18 tones at a fixed amplitude. It is suitable for low signal strength
use and is tolerant of frequency variations caused by, for example, Doppler
shift. It has a speed of 29 wpm and a bandwidth of 173Hz. |
|
|
DominoEx‑8 |
Yes |
|
DominoEx-8 uses 18 tones at a fixed amplitude. It is suitable for low signal strength
use and is tolerant of frequency variations caused by, for example, Doppler
shift. It has a speed of 58 wpm and a bandwidth of 346Hz. |
|
|
DominoEx‑16 |
Yes |
|
DominoEx-16 uses 18 tones at
a fixed amplitude. It is suitable for low signal
strength use and is tolerant of frequency variations caused by, for example,
Doppler shift. It has a speed of 115 wpm and a bandwidth of 355Hz. |
|
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Feld Hell |
Yes |
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FSK Hell 105 |
Yes |
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FSK Hell 245 |
Yes |
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MFSK‑8 |
Yes |
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MFSK‑16 |
Yes |
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MTS63 500 |
Yes |
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MTS63 1000 |
Yes |
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MTS63 2000 |
Yes |
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Olivia 125/4 |
Yes |
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Olivia 250/8 |
Yes |
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Olivia 500/16 |
Yes |
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Olivia 1000/32 |
Yes |
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Olivia 2000/64 |
Yes |
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RTTY |
Yes |
|
45.45 Baud with 170 Hz shift
are the most used settings. Having chosen RTTY, DM780 allows the speed and
shift to be changed. |
|
|
RTTY |
Yes |
|
75 Baud with 850 Hz shift
RTTY is in common use outside ham radio. Having chosen RTTY, DM780 allows the
speed and shift to be changed. |
|
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Throb‑1 |
Yes |
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Throb‑2 |
Yes |
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Throb‑4 |
Yes |
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DGPS |
No |
Differential Global
Positioning System. This is used with GPS to provide greater accuracy than
GPS provides alone. |
||
|
JT65A |
No |
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|
MEPT‑JT |
No |
|
MEPT-JT is used by the WSPR
(Weak Signal Propagation Reporter) program and the also is available in the
WSJT program. It uses a barely detectable slow frequency shift keying and to
the ear sounds like an unmodulated carrier. For
more information, see WSPR - Distant Whispers. |
