9. External speaker [ EXT SP ] :
The
TEAM SelCom 4040
has on its rear panel a socket
( 18 ) [ EXT SP ]
for an
external speaker of 4 - 8 ohm impedance with 3.5 mm plug. At 4 ohms the dissi-
pation of the speaker can be up to 2 watts.
10. Channel memory keys [ 1 - 4 ] :
The
TEAM
SelCom 4040
can store up to 4 frequently used channels and their
modulations. The default settings of the memories
1 - 4
are the channels 1, 9,
19, 40. These memories can be overwritten with other channel numbers. In case
of data loss the default settings will be stored in the memories again.
To save a new channel first select it with the channel selector switch
( 4 )
[ CHANNEL ]
. Then depress one of the memory keys
( 8 - 11 ) [ 1 - 4 ]
for 4 or 5
seconds until a second receipt tone indicates the overwriting of the new channel
number into the corresponding memory.
To call a saved channel depress briefly the corresponding memory key. On the
left side of the display the actual memory number is displayed in case of data
storage or recall. The memory number disappears by selecting a new channel.
11. DTMF Selective Call System [ CALL / SET ] :
General :
The DTMF selective call system ( =
D
ual
T
one
M
odulation
F
requency ) enables
the radio operator to open one or more muted receiver by transmitting a specially
coded tone sequence. This is only possible on condition that all partners use the
same channel, modulation mode and selective call system. The transceivers
must be switched on and operate normally and the selective call system has to
be set into standby mode to receive the coded tone calls. This will mute the
loudspeaker of the receiver until the detection of a coded tone sequence, which
corresponds with the own reception code of the transceiver. This will open the
receiver and it will remain unmuted even when the calling station stops transmit-
ting. So all activities on this channel can be heard, and those stations which are
not equipped with a selective call system, too. It is also possible to communicate
with them. They are only unable to open a receiver muted by a selective call sys-
tem.
The
TEAM SelCom 4040
selective call system uses 4 dual tones in succession.
There are 4 different dual tones. So there are 256 combinations possible. The
reception code and the transmission code can be programmed separately from
each other. For individual call it is recommended for each participant to program
his own reception code. Example : 4 Partners, consisting of head office and 3
mobile stations: Head office = 1111 / Jack mobile = 1112 / Susan mobile = 1113
/ John mobile = 1114. In case of group call all members have the same reception
code. This will open all receivers if the transmitted code is sent out interference-
free and free of noise. In all cases the transmission code of the
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