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Question regarding Tetra Recievers

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Hello everyone, I am new to radios and have quite a limited knowledge so bear with me.

I am trying to help out a local police force figure out their tetra com system. Essentially they use a Cobham CH150-13 system but getting a hold of one is proving problematic. Are there alternatives to this receivers? Is tetra an exclusive system? Apologies again is some of these questions appear too basic for a specific forum such as this. Thanks in advance.
 

rmi2065

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TETRA is a standards based radio system. And as such any manufacturers' equipment should be able to work with the infrastructure. I suppose the only concern would be gaining access to the system. I would speak with their system administrator. He would be able to tell you if they're using encryption. Be forewarned, ordering a radio with encryption (TEA1,2,3 or 4) is near impossible for a private party. It's not as easy as it is for P25 radios.
 
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Gotcha and thank you, I forgot to mention as well that its actually a transceiver if that makes any difference.. So assuming its not encrypted would a similar unit with close to identical stats function in the same way and is it a straightforward process? I was told I had to wait over half a year to get my hands on that part otherwise hah
 

smr

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Cobham uses basically Sepura radios and fit them for airborne use ( = expensive) . So look for Sepura/Cassidian/Motorola Tetra terminal for the same band. If they are using any of the TEA encyption it will be impossible to get into the system for an unauthorized terminal.
 

Raccon

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'Getting into the system' is controlled by registration and optionally authentication which uses TAA (TETRA authentication and key management algorithm). TEA is used for air-interface encryption and will prevent even an registered/authenticated terminal but without encryption from listening to encrypted communication. However the terminal could still listen to clear communication, e.g. where the system has a mix of clear and encrypted talkgroups,
 
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