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| s1: MFSK-28 burst waveform |
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| s2: MFSK-30 burst waveform |
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| s3: MFSK-32 burst waveform |
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| s4: MFSK-32 burst waveform |
- 16251.0 KHz USB 1425z MFSK-28 and MFSK-30 burst waveforms(s1, s2)
- 16257.0 KHz USB 0834z MFSK-32 burst waveform (s3)
and 21 October:
- 18203.0 KHz USB 0610z MFSK-32 burst waveform (s4)
The waveforms have different MFSK parameters such as tones, baudrate and shift: probably they not involve all code combinations but the signals are certainly very similar and probably sent by the same equipment.
These signals seem to be experiment/tests with a new Serdolik set of MFSK waveforms, something like a combination of a call (or perhaps ALE Selcall) and data-sending. The s4 MFSK-32 waveform is reported as "new" also in radioscanner.ru, but in that post is used with OFDM-60 as a starting combination while here is used also as 'stand-alone' in burst mode.
Interestingly the lack of the CIS-60 pilot-tone at the usual 3300 Hz: this could indicate the preamble purposes of the initial MFSK-32 tones. Also in this case, the burst mode is used.
Interestingly the lack of the CIS-60 pilot-tone at the usual 3300 Hz: this could indicate the preamble purposes of the initial MFSK-32 tones. Also in this case, the burst mode is used.
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| MFSK-32 used as sort of CIS-60 preamble |
An interesting difference - at least in these samples - between s1, s2 and s4 are the directions of the two initial sweeps (s3 has a different initial structure): in s1 and s2 the initial sweeps are upward while s4 has downward sweeps. In these recordings s2 carries the same data.
Other than the above post (by my friend KarapuZ) in radioscanner.ru forum, I could not find any other info/report about these waveforms: if they are on-air just from a few days we'll probably have the chance to read other logs and info in next days or weeks.
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| s1: MFSK-28 burst waveform |
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| s2: MFSK-30 burst waveform |
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| s2: MFSK-30 burst waveform dump |
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| s3: MFSK-32 burst waveform |
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| s4: MFSK-32 burst waveform |
summary
s1: grid MFSK-28 (09/28 used), speed 76Bd, shift 95Hz
s2: grid MFSK-30 (21/30 used), speed 76Bd, shift 95Hz
s3: grid MFSK-32 (21/32 used), speed 40Bd, shift 46.8Hz
s4: grid MFSK-32 (32/32 used), speed 83Bd, shift 96.7Hz
s1: grid MFSK-28 (09/28 used), speed 76Bd, shift 95Hz
s2: grid MFSK-30 (21/30 used), speed 76Bd, shift 95Hz
s3: grid MFSK-32 (21/32 used), speed 40Bd, shift 46.8Hz
s4: grid MFSK-32 (32/32 used), speed 83Bd, shift 96.7Hz
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