2) Busy channel lockout function
The lockout function for busy channels has the effect to prevent the unit from interfering with oth-
er stations. If there is a signal on the actual channel at the moment when you press the PTT key,
the transmitter will not be switched on. In this situation you will only hear a warning tone in the
speaker. When you release the PTT key the warning tone will be stopped and the set will revert
to receiving mode. You can only send if there is no signal on the actual channel at the moment
when you press the PTT key.
3) Energy saving function
The unit is equipped with an energy saving function. This function is factory set in your unit. This
function works only in receive mode. It reduces the current consumption when no signal is
detected on the actual channel and the rotary channel selector is not turned for a period of 10s.
If you do not use the unit for a long period of time, you should switch it off.
4) Additional muting function
The unit is also equipped with a possibility to suppress messages of unwanted operators on the
actual channel while the message of the partner station remains audible. To identify the wanted
radio messages there are two methods available: CTCSS and DCS.
CTCSS method ( = Continuous Tone Coded Squelch System )
The wanted radio message must contain a certain inaudible tone, which the CTCSS detecting
circuit of the receiving unit recognises and which can take the additional muting device out of ser-
vice. In transmit mode the unit adds to its voice signal also a certain inaudible tone which will be
recognised by the CTCSS detecting circuit of the counter station’s receiver to open its addition-
al muting device.
DCS method ( Digital Coded Squelch )
The digital pulse detecting circuit of the receiving unit checks if the received signal contains any
digital pulses. If it has identified a certain sequence of digital pulses as the opening code of the
wanted message, the muting device lets the radio message pass from that moment on. In case
of sending DCS coded messages the unit transmits immediately, after the PTT key has been
pressed down, a certain sequence of digital pulses, too. These pulses will be recognised by the
digital pulse detecting circuit of the counter station’s receiver, which gives an order to the muting
device to let the radio message pass to the speaker from that moment on. The duration of the
sequence of digital pulses is very short, so you can start to speak without waiting after you have
pressed the PTT key.
Please take into account that other radio operators, who are not equipped with a CTCSS or DCS
coding/encoding device, or who don’t use it, can hear all your conversation if they are working
on the same channel like you and your counter operator.
Your dealer can install for each channel separately the CTCSS or DCS operation. It is also pos-
sible to set at the same channel different operation types for receive and transmit mode. But if
you do not want the CTCSS or DCS operation at all, you can take it as well out of service.
If the CTCSS or DCS operation is installed in receiving mode on the actual channel, and if
there is a radio operator on this channel who uses either no CTCSS or DCS operation or a not
according one, you will see only the indicator light ( 2 ) lighting up green, but the speaker will be
silent. This shows you that the channel is occupied and that you should not transmit on this chan-
nel for not disturbing the other station.
The CTCSS method allows your dealer to select one of 38 different inaudible tones to encrypt
your messages between you and the wanted radio operator. If you use the DCS method your
dealer will have 166 different digital codes to encrypt your messages between you and the want-
ed radio operator.
The monitor key stops besides the noise suppression also a possible CTCSS or DCS operation
in the receiver. The monitor key function can be changed in that way by your dealer that only the
CTCSS or DCS operation in receiving mode is shut off, but not the noise squelch.
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manual 04.02.2005 14:28 Uhr Seite 16
