Blackbox Seal series, User Manual

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25KHz/12.5KHz
The default setting is 25KHz. You can decide whether the channel works as 25KHz or 6.25KHz through “W/N”
item in “Channel Information” menu.
CTSS/CDCSS
CTSS/CDCSS is a sub-audio signal, mainly used to avoid unwanted conversations on the same channel. With
CTSS/CDCSS set, you can only hear conversations with matched CTSS/CDCSS within effective signal range.
Without CTSS/CDCSS, you will receive all conversations on the same channel within effective signal range. You
can preset CTSS/CDCSS signaling through “CTC/DCS ENC” item in “Channel Information” menu or by your
local dealer.
Invalid Channel Indication
If current operating channel is an invalid channel, the radio will send a continuous alert tone, which means the
current channel is unable to transmit or receive.
Battery Power Indication
This function enables you to know the residual battery power at any time and place.
Turn on the radio and LED will indicate residual battery power L1, L2, L3 and L4 by flash times: 1, 2, 3 and 4.
L4 means the battery power is full. L1 means the battery power is lower than minimum normal operating power
capacity and should be replaced soon.
Power Protection
During use or maintenence, transmission is prohibited if the power source is improper or the working voltage is
higher or lower than normal working voltage.
If the work voltage is lower than 6.2v or higher than 9.5v, transmission is disabled.