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motorola syntor X DES problem ENCODES DES doesnot DECODE des

Discussion in 'Electronic Repair' started by john private smith, Jul 28, 2003.

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  1. i have searched the groups with no answers to this question, i have
    been given to repair a motorola syntor X VHF mobile trunk mounted
    radio for repair. the problem is, the DES system. the customer loads a
    key with a keyloader, the unit will transmit in secure mode, other
    units will decode the DES, but this particular syntor x mobile, will
    not decode other units. it just opens its squelch to hear digital
    static. it should either DECODE incomming DES signals with propper
    key, or it should switch to clear mode automatically if it detects a
    clear signal, it basically is always in clear mode when recieving,
    even if it is set in secure mode. any ideas as to whats wrong? i have
    tried to swap the secure head with a good one, but the same problem
    happens with this unit with the other working secure head.
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