ASTRO XTL 2500 Digital Mobile Radio with M5 Control Head 111
Secure Operation
System Considerations
• Trunked Systems only: If you press the PTT button when no
secure-voice channel is available, the display shows NO SECURE,
and a continuous talk-prohibit tone sounds until you release the
PTT button.
• Analog trunking systems: You are not allowed to change from
a secure transmission to a clear transmission during a secure
trunked call. If you attempt to change from a secure to a clear
transmission during a call, the radio generates a talk-prohibit tone,
and the display will show SEC ONLY or SECURE ONLY.
• Digital trunking systems: You are allowed to change from a
secure transmission to a clear transmission during a secure
trunked call.
Loss Indication
When you press the PTT button while in the coded mode and without
the encryption module containing a valid key, the speaker generates
bursts of alert tones, and the display shows KEY FAIL until you
release the PTT button.
When the radio is first turned on, six medium-pitched tones sound
and the display momentarily shows KEY FAIL to indicate that the
encryption module does not contain a valid key for the current mode.
If the periodic keyfail tone feature is enabled, six medium-pitched
tones are generated every five to ten seconds while the radio is not
transmitting or receiving to remind you that the radio does not have a
valid key for the current mode. The keyfail reminder will not sound
when the radio is in clear mode.
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