BK Radio P150, Service Manual

Page: 83 / 264

Page 3-4 Service Manual - KNG Portables
operation
3.3.1 mixed mode talkBack
If Mixed Mode Talkback is enabled, transmissions initiated while hold time remains will be in the same
mode as the received signal, if the signal was received on the Ready to Transmit (RTX) channel.
Depending on programming, the RTX channel can be the main channel, a held scan or priority channel
if Talkback Scan is enabled, or the Priority 1 channel if TX on PR1 is enabled. TX Mode on the RTX
channel must be set to MIXED.
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Press the PTT while the
RX indicator is shown
While hold time after a reception remains, transmissions will be in the same
mode as the received signal, regardless of the status of the TX Digital switch. As
in Talkback Scan, the RTX channel and receive annunciators will be displayed
for the duration of the timer.
3.4 encryption operation
The radio may optionally be configured for Secure communication on channels operating in Digital
Mode. No encryption is available for analog channels.
3.4.1 required Setup
Radios that have the DES/AES factory option for encryption must have encryption keys loaded with
an APCO Project 25 compatible key fill device such as the Motorola KVL 3000 Plus, using a BK Radio
keyloader cable. The radio can hold up to 32 AES and/or DES keys.
After loading keys in the radio, the KNG PC programming software must be used to configure the radio’s
key table and to assign default transmit keys to each channel.
Radios that have the OTAR factory option support Over-the-Air Rekeying of encryption keys (OTAR).
The KNG PC programming software must be used to enable OTAR and to mark the channel(s) that will
communicate with the Key Management Facility (KMF). In addition, the radio must have key encryption
keys (used only to encrypt other keys) loaded with an APCO Project 25 compatible key fill device such
as the Motorola KVL 3000 Plus, using a BK Radio keyloader cable.
3.4.2 operation
The receiver can be programmed to automatically detect both clear and secure signals.
The transmitter selects clear or secure operation based on each channel’s programming. Digital
channels can be programmed to always transmit encrypted, always transmit clear, or to select the
encryption mode with the TX Secure switch.
The display indicates Secure Operation as follows:
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In Standby Mode, if the radio will transmit in Secure Mode when PTT is pressed,
the encrypt icon flashes in the display.
When receiving or transmitting an encrypted signal, the encrypt icon flashes in
the display.