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User Manual
Rev. 1.0 - 29/11/05
PTRL NV/3 & RXRL NV/3
8.2.4 Stereo Decoder
The optional stereo decoder board must be specified on order and is installed at the
factory. It interfaces with the multiplex signal from the mainboard. If may be retrofitted
to units in the field, after replacing the receiver control CPU if its software release is
older than the 1.03 version. Later software releases (1.04 and higher) recognise the
board and enable its associated functions.
This board uses advanced technology to provide very high performance, such as
basic 70dB separation from 400 to 5000 Hz and over 60dB separation throughout
the audio band up to 15 kHz. Typical distortion is 0.01% or less and filters are flat to
within 0.1 dB from 30 to 15000 Hz. Deemphasis circuits may be enabled or disabled
via software.
The PLL decoder features output pilot frequency cancellation. Next are the
deemphasis circuits that are controlled by central control circuits and channel low-
pass filters. The pilot frequency cancellation technology enables the use of lower-
specs filters, with great benefits in terms of phase and output frequency linearity.
A local microcontroller installed on the board provides accurate time base generation
through a precision quartz, provides local deemphasis and PLL hook controls and
manages communications with the central CPU of the transmitter.
Audio output level on both channels is fixed and is set to +12dBm @ 400Hz (8.8Vpp),
balanced in the absence of deemphasis, at male XLR connectors. Since the positive
and negative lines use separate drivers, the signal may be relayed without balancing,
as the high output level - in this in6dBm (4.4Vpp) - allows the noise/signal
ratio to remain unchanged. The two fine-tuning trimmers for the output level on the
board are used for factory settings only during the channel balancing process; actually,
output level variation is limited to a narrow range (±1dB).
Summary of Contents for PTRL NV/3
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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...
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