3
3-4 System Description - Strider Receiver Link
Strider Link Series
SRFStrider-161004A-REV.A
Sinteck Sistemas Eletrônicos Ltda.
Audio/Baseband section
The main functions of theAudio/Baseband section on the main PC board of the receiver are
to split the baseband signal into three outputs: 30Hz to 75kHz to the MPX output BNC
connector.
For mono, the split is 30Hz to 15kHz to the Mono XLR connector. The user can choose if this
active filter in this output is disabled or enabled through internall jumpers. So, it is possible to
transmit 30Hz to 75kHz through this XLR connector. This module contains a mute switch,
controlled by the main processor and the mute comparator output of the Mute and Transfer
circuitry. The signal is then passed through a high frequency amplitude corrector, which
compensates for the baseband high-frequency roll-off caused by the 10,7MHz IF bandpass
filters, to restore proper amplitude response to the baseband signal.
The signal level is adjusted by the processor, beetwen 0% and 100% (normally 0V to 4Vpp)
in both outputs, MPX and Mono.
For Stereo demod operation, 2 XRL connectors was placed, the Stereo demod section
provides an excellent stereo separation through a modern IC. In this point, the signal level
has not adjust and a fix level of 0dB normally is found in the 2 XLR outputs (left and right). To
mute the stereo demod, the user have to accede the internal jumpers, that originally come
no-muted (See “jumpers section - configurations”).
Mute and Transfer Section
The Mute and Transfer circuitry located in the main PC board of the receiver mutes the audio
signal during periods of insufficient RF signal strength or for transfering operation to another
receiver. This function is only available to the XLR connectors selectable by internal
jumpers, not for Mono (XLR connector ) and MPX output ( BNC connector).
Metering and Status
The Metering and Status circuitry, located in the front panel PC board, condition the
metering samples and drives the status LEDs on the panel, also is possible to change any
parameter of the receiver, like choose channel and volume level. Remote status functions
are also provided.
Power Supply (AC)
The Power Supply section of the main PC board converts any AC input voltages
(110V/220V) into the three regulated voltages, required for the operation of the receiver.
The outputs are +12V, -12V and +5V for the most of the system electronics.Aregulated +5V
supply the main processor and LCD display backlight.
Remote Control
The Remote Control section in the receiver is a circuitry responsible to change the state of
the relay. This function is possible to connect auxiliary systems in the receiver, that will
change the state when the RF signal in the antenna is more than 10% of the maximum
signal. This parameter can be viewed through the LCD on the front panel.
03/P/23
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