July 17, 2024

This Week in Amateur Radio

North America's Premiere Amateur Radio News Magazine

Especially on the 40m band there are always radio services that have no place there, sometimes these are hard to recognise as intruders.

This is the case for the evening transmissions on 7080 kHz. At first glance it looks like a legal amateur radio RTTY signal.

Taking a closer look at the transmission parameters it becomes clear that this particular FSK mode is not used in amateur radio. The speed is 50 baud with a shift of 200 Hz, instead of the typical 425 Hz shift. This method, called CIS-50-50, is used primarily by the Russian Navy. A similar emission can be observed on 7088 kHz.

Read more – Southgate Amateur Radio News RSS Feed http://www.southgatearc.org/news/2022/september/rtty-intruder.htm