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User Manual
Rev. 1.0- 29/11/05
PTRL NV/3 & RXRL NV/3
This type of limiter temporarily reduces amplifier circuit gain whenever the threshold
is exceeded, so as to avoid heavy distortion.
Any external compressor, limiter or audio meter must be frequency compensated
with the same time constant used for preemphasis, so as to ensure correct deviation
modulation or control.
The transmitter provides extremely flat audio response, without any appreciable drop
at high or low audio frequencies; for this reason, we advise against making significant
changes to spectrum content at the different audio signal frequencies using the so-
called frequency equalizers. Unless limited to a few dB, an increase in the low and
high frequencies contained in the audio signal may lead to an overall degradation of
modulation or improper limiter operation.
5.3.4 Setting the receiver BF input level
Just like the transmitter, the receiver offers a broad range of setting options for the
output signal, which may be set from the front panel.
Main outputs MPX and Mono outputs are driven by the same level, which can be set
from -1.5 to +12 dBm in 0.5 dB steps. The Broadband Monitor output or the output of
the stereo decoder (if fitted) use a fixed +6dBm level.
5.3.5 Functionality of Remote-Control
Both units of the radio link provide full control of transmission and reception parameters
from the keyboard and the front panel display. Remote access to the same functions
can be achieved via the RS232 serial ports at the rear of the units. Remote access
via the serial port requires a dedicated software that is not supplied as standard (a
demo is included in the scope of supply).
A parallel port is also provided in addition to the serial port to obtain access to certain
signals and control lines. Both ports and the relevant signals are discussed below.
5.3.6 RS232 port
The RS232 port only handles Tx and Rx data signals and their return within the RS232
standard, with no handshake signal. Because these signals are inversely connected
to the port, a simple pin-to-pin serial cable needs to be connected directly to the
suitable connectors, typically a DB9 or a female DB25 connector at the matching PC
port and a male DB9 connector at the transmitter end. A communication software is
also necessary. Do not connect the cable when the PC or the transmitter are on.
Summary of Contents for PTRL NV/3
Page 1: ...PTRL NV 3 RXRL NV 3 User Manual Volume 1 Manufactured by Italy...
Page 4: ...PTRL NV 3 RXRL NV 3 ii User Manual Rev 1 0 29 11 05 This page was intentionally left blank...
Page 8: ...4 52 User Manual Rev 1 0 29 11 05 PTRL NV 3 RXRL NV 3 This page was intentionally left blank...
Page 55: ...51 52 User Manual Rev 1 0 29 11 05 PTRL NV 3 RXRL NV 3 10 Ensemble View 10 1 PTRL NV 3...
Page 56: ...52 52 User Manual Rev 1 0 29 11 05 PTRL NV 3 RXRL NV 3 10 2 RXRL NV 3...