Saturday, January 19, 2019

Russian Military "Squeaky Wheel" (S32) Now Even Squeakier

The Russian "Squeaky Wheel" marker has been around for many years.  It's a channel marker for a military network. It used to be designated XSW, but then Russian voice traffic appeared, and it was changed to S32.

Today, however, the sound has changed, at least for now.  It's now three audio frequencies instead of two, so the "wheel" really needs oil. This spectrogram was made from the U. of Twente WebSDR tuned to 3828 kHz USB, with the passband opened to 3 kHz to get all of the tones. Note how the 2800-Hz tone appears to be somewhat distorted.

Now we can get headaches even faster.