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2) CTCSS function
CTCSS stands for Continuous Tone Coded Squelch System. The CTCSS function serves to
suppress signals of unwanted stations on the actual channel. If this function is active the unit
works as follows:
The other station is only audible in the speaker, if it adds to its modulation signal a certain tone
in the frequency range from 67 Hz to 250 Hz with low level. In transmit mode the unit adds it-
self to its modulation signal a tone of the same frequency so that the muting device of the coun-
ter station can open also. If the function is inactive you can hear every station on the channel,
and in transmit mode no tone is added to the modulation signal.
Every tone frequency is coded with a certain number. The ScramTalk-808 offers you 38 dif-
ferent CTCSS tones for each channel. The following instructions show how to activate the
CTCSS function and to select a CTCSS tone for each channel:
Depress the menu key
&
( 5 ) two times, so that the number of the CTCSS tone of the actual
channel flashes in the LCD window. The unit is ready for adjusting the CTCSS tone code now.
Besides the flashing CTCSS code number you can see only the channel number and the bat-
tery symbol. The CTCSS adjustment can only be done as long as the CTCSS number is still
flashing.
Press the up key
▲
( 7 ) to increase the CTCSS code number for one step.
Press the down key
▼
( 6 ) to decrease the CTCSS code number for one step.
Pressing the keys for one second will make the CTCSS code numbers change quickly.
The CTCSS code numbers step in a ring like system. That means you go from code number 38
via code 00 to code 01 and vice versa. If the selected code is 00, the CTCSS function is switched
off for this channel which is indicated with a ringing signal tone.
If you press the enter key ( 8 ), the unit switches immediately back to the basic mode with
the new setting. You can also wait for 6 s, until the unit jumps into the basic mode by itself with
the new setting and a ringing signal tone.
See the CTCSS tone code table for CTCSS tone code numbers and CTCSS tone frequencies.
3) Scrambling function
The scrambling function serves to alienate the sent-out and the received acoustic signals in a
way, that you cannot understand it. So it is not possible that another normal radio operator is
able to listen to your sent-out message. Only the scrambling function in the receiver of the counter
station reverses the modified acoustic signal, so that it will be able again to be understood. Thus
you and your counter partner can achieve a certain security against being listened in on. To
reproduce every single tone of the speech signal in the original frequency at the loudspeaker of
the counter station, both conversion circuits, the one of the transmit station and the one of the
receiving station, must work with the same conversion frequency.
The scrambling circuits of the ScramTalk-808 offer you a total of 4 conversion frequencies.
Every selected conversion frequency is coded by a certain number from 1 to 4 and is valid for
transmit and reception mode. The following instructions show how to activate the scrambling
function and to select another conversion frequency:
Depress the menu key
&
( 5 ) three times, so that a flashing numerical digit appears in the
lower right corner of the LCD window. This is the code number of the actual conversion fre-
quency. The unit is ready for adjusting the scrambling function now. Besides the flashing code
number of the scrambling function you can see only the actual channel number, its CTCSS code
number, the scrambling function symbol and the battery symbol. The scrambling function
adjustment can only be made as long as the scrambling function code number is still flashing.
Press the up key
▲
( 7 ) to increase the scrambling code number for one step.
Press the down key
▼
( 6 ) to decrease the scrambling code number for one step.
Pressing the keys for one second will make the scrambling code numbers change quickly.
The scrambling code numbers step in a ring like system. That means you go from code num-
ber 4 via code OF to code 1 and vice versa. If the selected code is OF, the scrambling function
is switched off.
If you press the enter key ( 8 ), the unit switches immediately back to the basic mode with
the new setting. You can also wait for 6 s, until the unit jumps into the basic mode by itself with
the new setting and a ringing signal tone.
In basic mode you can see the scrambling function symbol , if it is active. If the scrambling
function is not active, the symbol is invisible.
See the scrambling code table for scrambling code numbers and conversion frequencies.
4) Selection of the call melody
To select the call melody which can be sent out by the call key C ( 9 ) depress the menu key
&
( 5 ) four times, so that a flashing numerical digit appears in the lower right corner of the LCD
window. This is the code number of the actual call melody. The unit is ready for selecting ano-
ther call melody out of 10 melodies now. Besides the flashing code number of the call melody
you can see only the actual channel number, its CTCSS code number, the call melody symbol
and the battery symbol. The call melody selection can only be made as long as the call melo-
dy code number is still flashing.
Press the up key
▲
( 7 ) to increase the call melody code number for one step.
Press the down key
▼
( 6 ) to decrease the call melody code number for one step.
Pressing the keys for one second will make the call melody code numbers change quickly.
The call melody code numbers step in a ring like system. That means you go from code num-
ber 10 to code 1 and vice versa. After every selection of a new call melody, the unit will repro-
duce that call melody in full length in the loudspeaker.
If you press the enter key ( 8 ), the unit switches immediately back to the basic mode with
the new setting. You can also wait for 6 s, until the unit jumps into the basic mode by itself with
the new setting and a ringing signal tone.
5) Monitoring functions
To take advantage of the two monitoring functions of the ScramTalk-808 you need another PMR
transceiver, because the surveillance operation requests always one unit at the monitored loca-
tion and the other unit at the location of the supervising person. The two monitoring functions of
the ScramTalk-808 enable it to use the unit either for the employment at the monitored location
or at the location of the supervising person. Therefore it is recommended to choose as second
unit also a ScramTalk-808. In the case of an employment as baby monitor one unit must be
situated at the baby and the other at the parents in the neighbour room.
The following instructions show how to activate and operate the monitoring function for the
monitored location ( baby unit ):
Depress the menu key
&
( 5 ) five times. The display will build up the flashing writing OF out
of the numerical digits 88 in the lower right corner of the LCD window. Besides the flashing writ-
ing 88 you can see only the writing Baby, the actual channel number with its CTCSS code num-
ber and the battery symbol. The next entry can only be made as long as the writing OF is still
flashing. With the help of the up/down keys
▲
( 7 ) and
▼
( 6 ) you can change the writing into
the writing and vice versa. To activate the monitoring function for the monitored location select.
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English
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ScramTalk-808 manual 15.06.2004 12:55 Uhr Seite 24
