E F Johnson Company 2425M70 Manuale Utente

8-6

If the channel has been strapped “Clear” and the option switch selects the “Secure” mode 
on power up and a transmission is attempted, “CLEAR ONLY” is displayed and 
transmitting is disabled. Likewise, if the channel is strapped “Secure” and the option 
switch selects the “Clear” mode on power up and a transmission is attempted, “SECURE 
ONLY” is displayed and the transmitter is disabled.

The radio can be programmed to ignore the “Clear” or “Secure” switch setting. These 
preceding indications then do not occur and transmissions always occur in the strapped 
mode.

If the C/S (Clear/Secure) switch is not programmed, the radio is always in the last known 
state (usually Clear) and there is no way to change it. For example, if the last known state 
is Clear and this parameter is not selected, it is never possible to transmit a Secure message 
on a channel strapped Secure because all that happens is transmitting is disabled, an error 
tone sounds, and “SEC ONLY” is displayed.

The following receive options can be programmed with conventional operation. With 
SMARTNET/SmartZone and P25 Trunked operation, encrypted calls are received if the 
proper key is programmed.

No Autodetect - Only signals coded like the transmit signals are received.

Secure Autodetect - Both clear and secure signals are automatically detected. This 
mode is automatically selected if the transmit mode is switch selectable.

Proper Key Autodetect - (Analog Channels) When this feature is disabled and a 
message is received with the wrong key, the audio unmutes and garbled (encrypted) 
audio is heard. However, if this occurs with this feature enabled, the audio remains 
muted.