PRORXD Broadcast Receiver User Guide
Commercial in Confidence
Broadcast Solutions, HD/SD Products,
PRORXD
100167
Revision: 7.0
Commercial in Confidence
Page 7-45
No
Property
Range
Description
1
Lock Status
Locked (green
background) or Not
Locked (red
background.
Tells you if the first demodulator has successfully
locked to the incoming bit stream.
2
Frequency (MHz)
L, S and C Bands
The frequency in megahertz (MHz) to which the
receiver’s first demodulator is tuned.
3
Bandwidth
DVBT/UMVL:
6, 7 and 8MHz
Narrowband:
2.5MHz
1.25MHz and 625kHz
DVB-T / UMVL bandwidths (usually used for
broadcast).
DTC narrowband (usually for surveillance).
DTC Ultra-narrowband (this is a licensable feature,
usually for surveillance).
4
Constellation
DVBT:
QPSK, 16QAM, 64QAM
Narrowband/UMVL:
BPSK, 8PSK, QPSK,
16QAM
This field indicates the OFDM constellation being
received.
QPSK-less user data, more robust, more range.
16QAM-more user data, less robust, less range.
The mode is automatically detected and is simply
displayed here. You can’t change it other than at
the transmitter.
5
FEC
DVBT:
1/2, 2/3, 3/4, 5/6, 7/8
Narrowband/UMVL:
1/3 or 2/3
This field indicates the forward error correction
(FEC) rate which is being applied. Think ‘data
bits/all bits’
1/3 means 1 bit out of 3 bits is data and thus 2
bits are used for error correction.
Small quantity of user data means less picture
quality, but more error correction means a more
robust signal and thus more range.
2/3 means 2 bits out of 3 bits are data and thus 1
bit is used for error correction.
More user data means better picture quality, but
less error correction means less robust signal and
thus less range.
The mode is automatically detected and is simply
displayed here. You can’t change it other than at
the transmitter.
6
Guard interval
DVBT:
1/32, 1/16, 1/8, 1/4
Narrowband/UMVL:
1/16 or 1/8
The guard interval which is being applied to the
narrowband mode in operation.
The guard interval is a deliberate extension of the
RF symbol period to give immunity to reflections.
1/16, short extension, deals with fast reflections,
more data, less range.
1/8, long extension, deals with slower reflections,
less data, more range.
