Modern military-grade radios encrypt signals and change the frequency on which they operate many times a second, making their transmissions impossible to intercept. But many Russian forces are communicating on unencrypted high-frequency (HF) channels that allow anyone with a ham radio to eavesdrop. The Russian army does have some modern tech. It started receiving Azart radios, which have built-in encryption and can operate on much higher frequencies, in 2012. One of the many surprising failures of the Russian invasion force in Ukraine has been in radio communications. Do you think that Russia uses old technology ?

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