It also prevents unauthorized two-way radios from receiving the system.RAS does not prevent scanners from monitoring the system. It prevents unauthorized two-way radios from transmitting on the system.
It can degrade, somewhat, scanner performance on RAS-enabled systems, as the scanner must disregard CRC errors in the data stream and could misinterpret the data stream in some cases.
Starting with the R8.0 release Hytera has what they call 'Over the air encrypt'. From the release notes:In the repeater codeplug, you can specify a range of radio IDs to either allow or reject (and you can have multiple entries. That isn't RAS, per say.
And naturally it's not compatible with RAS.Over the Air Encrypt
With this feature enabled, only the signaling frame transmitted over the air is encrypted. The receiving
radio cannot receive signaling further if it fails to decrypt the signaling frame correctly. In the repeater
mode, if the transmitting radio fails to satisfy the encryption requirements, signaling transmitted by it will
not be forwarded by the repeater, and the radio cannot receive the signaling or data forwarded by the
This feature is developed to prevent unauthorized access to the system, to ensure the security of the
To set related parameters in the CPS, go to:
 Conventional -> Digital Common -> Encrypt -> Over the Air Encrypt
 Conventional -> Channel -> Digital Channel -> Over the Air Encrypt Type
 Conventional -> Channel -> Digital Channel -> Only Receive Encrypt Air
 Conventional -> Channel -> Digital Channel -> Over the Air Encrypt Key
There are some locals here who try and hijack every system that hits the air. I don't blame operators for trying to protect their investment from these guys.Weird though that they enable RAS, but not encryption... Guess they don't mind people listening, just don't want them doing it with a 'real' radio or borrowing airtime on their repeater.