Spectronic Denmark A S INCA-TXHA INCA TXFH-RC Wireless Audio Transmitter User Manual TXFH RC userguide 1015QKE
Spectronic Denmark A/S INCA TXFH-RC Wireless Audio Transmitter TXFH RC userguide 1015QKE
User Manual
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INCA TXFH-RC
WIRELESS AUDIO TRANSMITTER
Version 1.02
COMPANY CONFIDENTIAL
Spectronic Denmark A/S
Skindbjergvej 44
DK-8500 Grenaa
Telephone: +45 86 38 72 22
Fax: +45 86 38 77 04
www.spectronic-denmark.com
sales@spectronic-denmark.com
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Table of contents
1
INCA TXFH-RC WIRELESS AUDIO TRANSMITTER..............................4
1.1
Introduction.......................................................................................4
1.2
System Concept ...............................................................................5
1.2.1
General .....................................................................................5
1.2.2
Different settings .......................................................................5
1.2.3
Application Note........................................................................6
1.2.4
Wire connection ........................................................................7
1.2.5
Transmitter................................................................................7
1.2.6
Remote Control Receiver..........................................................7
1.2.7
Remote Control Upcodes – TXFH-RC VHF .............................8
1.3
Technical specifications ...................................................................9
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Transmitters
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1 INCA TXFH-RC WIRELESS AUDIO TRANSMITTER
1.1 Introduction
This document describes the general functions and performance of the
Spectronic INCA TXFH-RC transmitter.
Information on items of a specific delivery is to be found in a separate
document, stating TX frequencies and remote control address codes of the
individual units.
DC Supply
Microphone
Antenna
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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.
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.
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.
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.
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
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.
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.
Scrambler on / off: The transmitter includes an audio scrambler-circuit,
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.
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.
Changing channels: It is possible to shift between 4 channels by the
remote control. The 4 channels (frequencies) are pre-programmed in the
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transmitter. During operation, it is possible to shift channel in order to use the
optimal channel (frequency).
Output Power:
The transmitter has two power levels, which can be selected by the X-ider
remote control. The output power in high mode is 1W for the VHF version. In
low power mode both versions will deliver approx. 300mW into 50 ohms. The
supply voltage can be varied in the range from 3.3 to 15 V DC. In the low
power mode the output power will be constant in the full supply voltage
range, whereas in the high power mode the output power will begin to
decrease at 4.75V input voltage and will be approx. halved at 3.3V. Because
of the build-in switch-mode regulator the current consumption will increase
as the input voltage is lowered.
1.2.3 Application Note
To achieve maximum RF range it is advisable to keep the antenna as far
away from the surroundings as possible. If an antenna is in close proximity
to metal surfaces or concrete walls, the efficiency of the transmitter will be
minimized due to power absorption and disturbance of the antenna radiation
pattern.
For maximum battery lifetime and for minimizing the risk of being found by
bug detectors or scanners, the transmitter can be switched off into sleep-
mode by means of the remote control. Alternatively, simply choose VOX
mode, when in doubt whether persons will be present in the room being
monitored. The TX will then only go “on the air” every time conversation is
detected in the room. After app. 15 sec. without conversation, the TX will go
to sleep again and thus sawing battery power.
Please note that because the transmitter is a very small high-power device,
the housing is becoming hot under normal application conditions (up to 60
degrees centigrade). Therefore don’t wrap the transmitter into isolation
materials and always be sure that the transmitter can get rid of its heat
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1.2.4 Wire connection
1.2.5 Transmitter
During off state, the transmitter is completely switched off, and as the remote
receiver does not contain a local oscillator, as would normally be the case,
when using a heterodyne receiver, everything is totally quiet and nothing can
be found by e.g. spectrum analyzers or scanners.
For minimum current consumption, analogue frequency modulation with an
audio bandwidth of 100 - 5000 Hz (unscrambled mode) has been chosen.
1.2.6 Remote Control Receiver
The remote-receiver is realized by a very small and sensitive hybrid IC,
intended for unlicensed low-power remote control. The carrier frequency is
OOK (on off keyed) modulated and the system provides up to 4096 different
address codes. The Spectronic X-IDER remote-control transmitter is used to
send the different codes for setting up the TX.
The Address Code of the Remote Control is factory set, according to
customer specifications, or as specified for standard frequencies by
Spectronic.
Red: VCC
Antenna
Mic
Battery or
mains
module
( MMM )
TXFH
-
RC
Black: GND
White
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1.2.7 Remote Control Upcodes – TXFH-RC VHF
X-IDER left-hand HEX switch
0 TX on
1 TX off (factory default)
2 AGC on (factory default)
3 AGC off
4 TX audio scrambler on
5 TX audio scrambler off (factory default)
6 Channel 1 (factory default)
7 Channel 2
8 Channel 3
9 Channel 4
A VOX on
B VOX off (factory default)
C Low power
D High power (factory default)
E NTIA Compliant on
F NTIA Compliant off (factory default)
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1.3 Technical specifications
Technical specifications
Transmitter
Output frequency range VHF 150-174 MHz
Min. channel raster 12.5 kHz
Output power, VHF (Vbatt. = 3.3 to 15 V) typ. 1000 mW into 50
Ω
load (high power)
typ. 250 mW into 50
Ω
load (low power)
NOTE: In high-
power
mode the output power
decreases for input voltages below 4.75 V
Frequency stability ± 2.5 ppm
Max. deviation (FM) ± 2.5 kHz
Spurious & harmonics < -60 dBc non-harmonic
< -50 dBc harmonic
Frequency response, unscrambled 100 Hz to 5 kHz, -3 dB
NTIA frequency response, unscrambled 100 Hz to 3 kHz, -3 dB
Frequency response, scrambled 280 Hz to 4 kHz, -3 dB
Audio amplifier AGC range 45 dB
Supply voltage 3.3 V-15.0 V
Battery types AA, AAA, C123 Lithium or
Lithium Ion rechargeable
Current consumption VHF:
Vbatt. = 4.75-15 V (output power = high power) 435-215 mA DC
Vbatt. = 3.3-15 V (output power = low power) 225-95 mA DC
Current consumption, sleep mode < 200 µA DC
Current consumption, VOX-mode (silent room) < 300 µA DC
Operating temp. range -20º C to 60º C / -4 F to 140 F
Dimensions HxWxD 53x23x7.5 mm / 2.1x0.91x0.295 inches
Remote control receiver
Remote control frequency (standard) 433.92 MHz
Sensitivity <-90 dBm
Modulation OOK
Coding addresses 4096
Required accessory for operation
The TXFH-RC transmitter requires the handheld X-IDER remote control transmitter module for
maximum flexibility and functionality.