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17. Important information
Only use the original power packs to operate
the devices. Contact your dealer, if one of the
power packs should become defective. The
use of other power packs can substantially
damage the devices, if the polarity (+/-) and
voltage are applied incorrectly.
A defective power pack cannot be repaired.
The connection cable cannot be exchanged;
the power pack must be disposed immediate-
ly.
Do not pull the power packs out of the sock-
ets and out of the babyphone by the cables;
remove the power packs by holding the plugs
and/or housing and then remove the power
pack to avoid breaking or tearing a cable.
Do not place the transmitter in the crib or play
pen.
Always install the devices out of range of small
children.
is somewhat less in comparison to power
pack operation, if one or both devices are op-
erated with rechargeable batteries.
Two power packs are enclosed so that you
can connect both the transmitter and receiver
to a mains socket (230 Volt/50 Hz).
The active receiver will hiss for a few seconds,
if you fi rst switch the transmitter off when you
don‘t need the devices anymore. The receiver
tries to establish contact with the transmitter
in this period. The receiver switches automati-
cally to the range signal after some seconds,
in order to signal the disconnection.
We recommend removing the rechargeable
batteries, if the devices are not to be used for
a lengthy period because empty rechargeable
batteries crystallize and can cause damage.
18. Notes on Disposal
Old units, marked with the symbol as il-
lustrated, may not be disposed of in the
household rubbish.
Used recharge-
able and non-re-
chargeable batter-
ies which are marked with one of the symbols
illustrated may not be disposed of in the house-
hold rubbish.
You must take them to a collection point for old
units, old batteries or special waste (enquire at
your local authority) or the dealer from whom
you bought them. These agencies will ensure
environmentally friendly disposal.
19. Care and warranty
Before cleaning the unit, disconnect it if nec-
essary from other components; do not use ag-
gressive cleaning agents.
The unit has been carefully checked for defects.
If nevertheless you do have cause for complaint,
please send us the unit with your proof of pur-
chase. We offer a 1 year warranty from date of
purchase.
We are not liable for damage arising from incor-
rect handling, improper use or wear and tear.
We reserve the right to make technical modi-
cations.
20. Technical data
Carrier frequency:
channel 1 – 864.850 MHz,
channel 2 – 864.864 MHz
Digital coding:
16 different digital codes selectable
Operating voltage (Transmitter):
3.6 V DC, with enclosed rechargeable batter-
ies (AAA)
or Alkaline Micro batteries (AAA)
or with power pack
Operating voltage (Receiver):
3.6 V DC, with enclosed rechargeable batter-
ies (AAA)
or Alkaline Micro batteries (AAA)
or with power pack
max. range:
600 meters depending upon structural con-
ditions
Plug-in power pack transmitter:
6 V DC, 150 mA secondary;
230 V AC/50 Hz primary
Plug-in power pack receiver:
6 V DC, 150 mA secondary;
230 V AC/50 Hz primary
You can fi nd up-to-date product information on our
website
http://www.comtel.ch
You have the additional possibility of switch-
ing to another channel in the rare case that the
transmission is disturbed by other signal sourc-
es in the 864 MHz frequency range.
12. Digital code combination table
Digital
code
Switch 1
Switch 2
Switch 3
Switch 4
Code 1
On
On
On
On
Code 2
On
On
On
Off
Code 3
On
On
Off
On
Code 4
On
On
Off
Off
Code 5
On
Off
On
On
Code 6
On
Off
On
Off
Code 7
On
Off
Off
On
Code 8
On
Off
Off
Off
Code 9
Off
On
On
On
Code 10
Off
On
On
Off
Code 11
Off
On
Off
On
Code 12
Off
On
Off
Off
Code 13
Off
Off
On
On
Code 14
Off
Off
On
Off
Code 15
Off
Off
Off
On
Code 16
Off
Off
Off
Off
13. Range
You must test the range of your babyphone in
tion conditions of radio waves. A range up to
600 m can be achieved in optimal conditions.
However the actual range essentially depends
on local conditions. E. g. the transmitter loca-
tion, constructional and atmospheric conditions
must be taken into consideration. The range can
additionally be reduced, if you hold the receiver
in your hands and enclose it.
14. Range alarm
The receiver sounds an acoustic range signal
approx. 7 seconds after disconnection, if the re-
ceiver is outside of the transmitter range.
The acoustic receiver range alarm is also fur-
thermore triggered if:
– the transmitter is switched off,
– the transmitter is set to a different channel
than the receiver,
– the transmitter is set to a different digital code
than the receiver,
– the transmitter is only working with dis-
charged rechargeable batteries.
15. Belt clip/suspension arrangement
The transmitter and receiver can be attached to
your belt with the rear belt clips or be fastened
to a wall with the suspension arrangement (with
suitable fastening material).
16. Tips und tricks in case of problems
Check the power supply, if either the transmit-
ter or receiver does not work.
Check the digital code and the transmission/
reception channels of both devices (Connec-
tion is only possible if these correspond), if no
transmission between transmitter and receiver
can be ascertained.
you have left the transmitter range. Please re-
duce the distance between transmitter and re-
ceiver.
Since the CT-1900 is a radio device, it can-
not be ruled out that you hear conversations
of other radio participants and that other radio
participants hear the conversations or noises
your transmitter emanates. The CT-1900 how-
ever uses transmission frequencies, which
should exclude such disturbances to a large
extent. Switch to another channel (frequency)
and/or change the digital code of your baby-
phone, if you should nevertheless determine
such disturbances in exceptional cases.
Place the transmitter and receiver upright to
ensure optimal transmission/reception condi-
tions.
You might hear a whistle (feedback, acoustic
feedback), if the receiver is located too near
to the transmitter and the volume is too high.
To avoid this increase the distance between
transmitter and receiver.
Too weak batteries can cause the receiver to
emanate a hiss or trigger the range alarm.
Please note that there is no general protection
against eavesdropping in the 864 MHz fre-
quency range.
8


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