User's Manual

5
5
BER Pre Viterbi (Status Only)
This figure is for engineering use and gives a representation of the error
rate prior to the error correction techniques having been applied in the
receiver.
BER Post Viterbi (Status Only)
This figure gives a measure of the bit error rate after error correction
techniques have been applied in the receiver. Any numbers greater than
0 in this field indicate the presence of un-correctable errors in the
received stream, and thus picture glitching and audio artefacts will
occur.
Input Level (Status Only)
This figure indicates the received signal level at the two receiver inputs.
Normal Operation will occur when the input level is between –15 and –
90 dBm. Signals greater than –15 may be too powerful and cause
damage. Signal less than –90dBm may be too weak and cause picture
loss (typical link failure will occur between –95 and –99dBm).
Demod Lock Status (Status Only)
This indicates whether the demodulators are successfully locked to the
RF signal.
Data
With this ON / OFF control the user can select whether the receiver
extracts any data component that may be in the transmitted stream.
Such data components are presented at the receiver DATA output port.
Data Baud Rate (Status Only)
This field reports the baud rate of any RS232 serial data component that
is present and selected in the stream.
Input Line Standard (Status Only)
This field reports the line standard that is currently being, or last was,
decoded.
Power Up Line Standard
Using this field the user can select what line standard of video the
receiver will output (PAL / NTSC) when the receiver is first powered on
and before it has locked to an incoming RF signal.