STANAG-4539 HF Fixed Frequency TDMA transmission, used by NILE/Link-22, spotted on 7606.0 KHz/usb and followed from 0905z up to 0950z (October, 9). Modem for HFFF TDMA operations are described in Annex D of STANAG-4539.
The 270 symbols of the Media Code Frame in this samples are arranged according to the QPSK Traffic Waveform #2 (WF2) consisting of 8 sections with 18 symbols data blocks and 15/16 symbols mini-probes.
Other NILE/Link-22 waveforms, all characterized by having the same 112.5ms ACF value, are discussed here.
The 270 symbols of the Media Code Frame in this samples are arranged according to the QPSK Traffic Waveform #2 (WF2) consisting of 8 sections with 18 symbols data blocks and 15/16 symbols mini-probes.
Other NILE/Link-22 waveforms, all characterized by having the same 112.5ms ACF value, are discussed here.
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| Fig. 1 |
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| Fig. 2 |
As in the table below, there are six sections consisting of 18+16=34 dibit symbols (ie 68 bits) and two sections consisting of 18+15=33 dibit symbols (ie 66 bits). Using the time shift cursor of the tool in Fig. 2 you may get the same order of the sections which is shown in the table.
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