Olivia is a mode developed by Pavel Jalocha, who developed many other modes, including the basics of PSK-31.
|
Parameter |
Value |
|
Frequency range |
HF |
|
Operation modes |
Boroadcast |
|
Modulation |
MFSK |
|
Submodes |
250 Hz / 8 Tones / 31.25 Bd 500 Hz / 8 Tones / 62.5 Bd 500 Hz / 16 Tones / 31.25 Bd 1000 Hz / 32 Tones / 31.25 Bd |
|
Receiver settings |
DATA, CW, LSB or USB |
|
Input format(s) |
AF, IF |
|
Additional Info |
7038.5 MHz, 10133.65 MHz, 14075.65 MHz, 14107.5 MHz, 18102.65 MHz, 21086.5 MHz, 28076.0 MHz |
Olivia focuses on robustness against signal-path disturbances, especially fading and multipath propagation. This requirement results in a low data-throughput and in a standard configuration five characters are merged into one block and transferred in two seconds, i.e., 2.5 characters per second.
The signals are MFSK-modulated, mostly with a baud rate of 31.25. In this way all transmitted energy is concentrated in a single tone of relatively long duration.
The standard center frequency depends on the chosen bandwidth, i.e., it is 500 Hz plus half of the selected bandwidth. The user can tune the receiver so that the signal has a center frequency according to the standard, or change the center frequency manually. The bandwidth can be changed manually as well.
The polarity of the signal is being detected and the demodulator set accordingly.
For each character a confidence value is calculated and evaluated. Data with a confidence value of at least 90% are displayed in black, with a confidence-value of at least 50% they are shown in red - otherwise a red underline character is displayed. A block with a confidence value of less than 75% is not shown at all.