Over the years I’ve owned a variety of digital and analog RF headsets. Back in the day it was not uncommon to accidently pick up other people’s cordless phones and wireless devices when using analog headphones. That does not happen with digital RF in my experience. Which makes me wonder, if digital RF headphones are are secure as say Bluetooth ones, or if they are prone to eavesdropping by people with the same type of headphones, etc.
An example of what specific type of RF-not-Bluetooth headset you’re talking about would be useful. Especially if you want a factual answer rather than vague guesswork from general principles.
Most modern RF headphones seem to use the 2.4 GHz band, similar to Bluetooth. Protocols using this band are varied, but all are required to adhere to some basic rules, the most important of which is some form of spread spectrum transmission, basically frequency hopping in a psuedo-random manner. As Hedy Lamar realised, frequency hoping provides a quite reasonable basis for an encrypted channel. So even without any other encryption of the data, is isn’t easy to latch onto a 2.4GHz signal. Devices need to be paired, where paring allows the devices to exchange the key needed to keep track of transmission frequency. This isn’t robust against a concerted attack designed to defeat the system, but it does prevent inadvertent interception. Even a concerted effort to intercept the data stream, and thus listen in would require some intimate understanding of the precise protocol used. Quite doable, but not something available to a casual snooper.
Very helpful. Thanks!