DTC Communications Inc. PDTX100S Manuel D’Utilisation
DTC COMMUNICATIONS, INC.
11
PROGRAMMING
Transmitter Control Application
Output Frequency (MHz)
The transmit frequency can be changed by entering the new desired
frequency in this field. Values outside the range supported by a particular
transmitter type will be rounded to the highest or lowest supported
frequency as appropriate. The resolution of the transmit frequency is
complex and resolved to the closest achievable within the constants of the
supported step sizes of 1MHz, 1.6667 MHz and 2.5 MHz.
The transmit frequency can be changed by entering the new desired
frequency in this field. Values outside the range supported by a particular
transmitter type will be rounded to the highest or lowest supported
frequency as appropriate. The resolution of the transmit frequency is
complex and resolved to the closest achievable within the constants of the
supported step sizes of 1MHz, 1.6667 MHz and 2.5 MHz.
Modulation Output
This control is used to turn on and off the RF output. After a configuration
change, the output always reverts to OFF. It must be ON for operation.
This control is used to turn on and off the RF output. After a configuration
change, the output always reverts to OFF. It must be ON for operation.
Modulation FEC
The default FEC is 2/3, however improved range operation can be achieved
by selecting FEC 1/3. FEC 1/3 will improve signal range by 3dB. However
FEC 1/3 reduces link capacity to 1.2Mb/s therefore reducing picture
quality.
FEC Link Bitrate Sensitivity 2/3 2.4Mb/s: -99dBm,
1/3 1.2Mb/s: -102dBm
The default FEC is 2/3, however improved range operation can be achieved
by selecting FEC 1/3. FEC 1/3 will improve signal range by 3dB. However
FEC 1/3 reduces link capacity to 1.2Mb/s therefore reducing picture
quality.
FEC Link Bitrate Sensitivity 2/3 2.4Mb/s: -99dBm,
1/3 1.2Mb/s: -102dBm
Modulation Guard Interval
The Guard Interval is fixed at 1/16 in current software releases.
The Guard Interval is fixed at 1/16 in current software releases.
Modulation Bandwidth
For the Palladium transmitter products, the modulation bandwidth is fixed
at 2.5MHz.
For the Palladium transmitter products, the modulation bandwidth is fixed
at 2.5MHz.
COFDM Mode
The COFDM mode can be changed between QPSK and 16QAM. QPSK is
the default mode and will give the strongest most rugged RF link
performance. Selecting 16QAM reduces the link performance by 5dB but
improves the link data throughput, giving significantly better video quality.
The COFDM mode can be changed between QPSK and 16QAM. QPSK is
the default mode and will give the strongest most rugged RF link
performance. Selecting 16QAM reduces the link performance by 5dB but
improves the link data throughput, giving significantly better video quality.
Default values are shown in red.
OFF
2/3
1/16
2.5 MHz
QPSK
(your frequency)