16 September 2014

Israeli Navy Hybrid HF Modem

This system is used by Israeli Navy, more likely from 4XZ station in Haifa, and it's quite easy to hear. The waveform is composed of  3 parts: a four tones (2 seconds length) preamble, the parallel-data part using QPSK modulation in channels at 75Bd speed and the final serial-data part according to the MIL 188-110 single tone (1800Hz carrier modulated with PSK-8 at 2400Bd). A variant with an added 230ms pre-tone at 1000Hz has been seen.
Since the low data-rate, the apparent ACF is 66.6 ms.

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