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XTS 2500 Consistent Key Fail

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Radioman425

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Jul 22, 2020
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Hello all, I did a bit of a forum search for this but couldn't find anything definitive. I have an XTS 2500 model 2.5 portable, and I keep losing my encryption key. Seems to happen after a battery change. I use DES-OFB encryption on P25 channels. Is there maybe an issue with the encryption board? Thanks!
 

rescue161

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If Infinite Key Retention is not checked, you should turn the radio off before changing batteries. If you leave it on and remove the battery, the key will be dumped. We went through this with the old Systems Sabers. There was a LOT of rekeying of radios back in those days.
 

RFI-EMI-GUY

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I have a bunch of Systems Sabers. There was never an infinite key retention option for those. If the radio is switched off, you have a bit of time to change batteries before losing the Key maybe 30 to 60 seconds, never tested it that long.

The only weird thing I have noticed is that with Lithium Ion batteries there is an internal battery protection module and if the battery voltage drops below a certain point the battery is electrically disconnected from the radio. So whereas a depleted NICD battery might keep a few volts potential on the secure module for days or weeks, the Lithium Ion does not.
 

rescue161

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Yes, that is correct about the Systems Saber not having IKR, hence why we were constantly rekeying those old Systems Sabers..lol Users would unknowingly take the battery off while it was on and the key would be dumped. Once IKR became a thing, we saw the number of radios coming through our shop for rekeying decrease dramatically.
 
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