Справочник Пользователя для Spectronic Denmark A/S INCA-TXHA
#1015QKE
Page 5 of 9
1.2
System Concept
1.2.1
General
The INCA TXFH-RC is a series of wireless audio, remote controllable, small
sized VHF transmitters intended for concealed room monitoring etc.
sized VHF transmitters intended for concealed room monitoring etc.
The TX unit comes with flying leads for the battery connection and the
antenna terminal has a female MMCX-connector. The TX unit is deliverable
with external microphone.
antenna terminal has a female MMCX-connector. The TX unit is deliverable
with external microphone.
Note: The special functions/upcodes will only be available, if using an
X-IDER 4096 TX. Please refer to Section on Remote Control Upcodes –
TXFH-RC VHF.
X-IDER 4096 TX. Please refer to Section on Remote Control Upcodes –
TXFH-RC VHF.
1.2.2
Different settings
Sleep mode on / off: The transmitters can be switched into sleep-mode. In
sleep-mode, the current consumption is only app. 200 uA, which maximizes
the lifetime of the battery more than 1000 times.
sleep-mode, the current consumption is only app. 200 uA, which maximizes
the lifetime of the battery more than 1000 times.
In sleep-mode the receiver only goes on the air in app. 30 msec. for every
2.5 seconds to look for a valid code transmission
2.5 seconds to look for a valid code transmission
VOX mode on / off: At the expense of a little higher current consumption
(app. 300 uA), the transmitter can be switched into VOX-mode, meaning that
the transmitter will run only when the microphone hear acoustic signals like
talking or music. This VOX is an advanced type of circuit that has the ability
to distinguish voice from background noise and the power circuit is only
switched on when a voice signal is present. Therefore, the switching
operation is highly reliable in noisy environments.
(app. 300 uA), the transmitter can be switched into VOX-mode, meaning that
the transmitter will run only when the microphone hear acoustic signals like
talking or music. This VOX is an advanced type of circuit that has the ability
to distinguish voice from background noise and the power circuit is only
switched on when a voice signal is present. Therefore, the switching
operation is highly reliable in noisy environments.
AGC on / off: is integrated in the transmitter. The AGC action prevents
over-modulation at high sound levels and makes it possible to listen to very
weak conversation at the same time.
over-modulation at high sound levels and makes it possible to listen to very
weak conversation at the same time.
Scrambler on / off: The transmitter includes an audio scrambler-circuit,
which can be switched on and off by the remote control.
which can be switched on and off by the remote control.
The scrambler has been added for greater security, and to avoid listening in
by unauthorized persons. It is based on simple frequency-inversion
techniques due to the very low power needed for that sort of circuit.
by unauthorized persons. It is based on simple frequency-inversion
techniques due to the very low power needed for that sort of circuit.
In the scramble mode, the audio frequency response, as well as the signal to
noise ratio, are somewhat minimized compared to the un-scrambled mode.
noise ratio, are somewhat minimized compared to the un-scrambled mode.
Changing channels: It is possible to shift between 4 channels by the
remote control. The 4 channels (frequencies) are pre-programmed in the
remote control. The 4 channels (frequencies) are pre-programmed in the