COBHAM SOLO4 Spezifikationen PDF herunterladen (Seite 47)

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.

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).

MPEG2 GOP Length

By default MPEG2 GOP length is set to a low delay stripe refresh mode.

This option allows the user to set the GOP length for a standard GOP

structure at the expensive of a

n additional delay.

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, _, 1/8 etc) It is recommended that

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COBHAM SOLO4 Spezifikationen Seite 47