User manual

35
DVB-T Guard Interval
Applicable in DVB-T mode only. The Guard Interval defaults to 1/32.
Other guard intervals such as 1/16 or 1/8 are available for very long
range (aircraft downlinks) applications.
DVB-T Modulation
Applicable in DVB-T mode only, the COFDM mode can be changed
between QPSK, 16QAM and 64QAM. 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.
Output Attenuation
This control can be used to make minor adjustments to the output
power level, but in normal operation should be disregarded.
Video Input
This control is used to select the composite video input standard.
Options are PAL, and NTSC both with and without 7.5 IRE pedestal.
The licensed SDI digital video input can also be selected.
MPEG Mode
The default encoding mode is MPEG2, however for SOLO4 products if
the Ultra Narrow Band upgrade has been purchased, then MPEG4 will
also be available. It is recommended that MPEG4 be employed when
the unit is operating at low bitrates (2.5MHz bandwidth FEC1/3 or
1.25MHz bandwidth FEC1/3).
MPEG4 Encoding Mode
This option is only available on SOLO4 products installed with the Ultra
Narrow Band Upgrade. This defaults to low delay interlace. Other
modes are available but advice should be sought from domo before
selection.
MPEG4 Frame Rate
This option is only available on SOLO4 products installed with the Ultra
Narrow Band Upgrade. This option allows the user to select lower
frame rate encoding (1/2 frame rate, ¼, 1/8 etc) It is recommended that
MPEG4 reduced frame rates be employed when the unit is operating at
low bitrates (1.25MHz bandwidth FEC1/3).