STANAG 4285 Signal Showing Up on 40 Meters, Other Intruders Spotted

A STANAG 4285 intruder has been showing up on 7101.8 kHz, according to the International Amateur Radio Union (IARU) Region 1 Monitoring System (IARUMS).

“The signal was strong in South America, but rather weak in Europe,” the latest edition of the IARUMS newsletter reported. “We had the same problem in earlier times. Location probably Falkland Islands.”

Its unusual designation aside, STANAG 4285’s motorboat-like signals are pretty common on HF frequencies between about 2 MHz and 23 MHz. It is the data communication “modem” that North Atlantic Treaty Organization (NATO) military agencies use for the purposes of standardization, and it comes in several flavors (sub-modes), with a variety of speeds — from 75 bps to 3600 bps — and interleaving, both short and long. BPSK, QPSK, and 8PSK are used with STANAG 4285 for specific speeds. The waveform consists of an 1800-Hz carrier with PSK modulation.

via American Radio Relay League | Ham Radio Association and Resources

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