COBHAM H264ENC Betriebsanweisung PDF herunterladen (Seite 86)

SOLH264TX Broadcast Transmitter

H264TX, H264ENGTX, H264ENC

UNCLASSIFIED

Part A - User Guide

DS000091

Rev 1.2 2013-05-02

UNCLASSIFIED

Page 10-76

more data, less range.

1/4, long extension, deals with slower reflections,

less data, more range.

DVBT modulation

QPSK, 16QAM

and 64QAM

The COFDM constellation in use.

QPSK-less user data, more robust, more range.

16QAM-more user data, less robust, less range.

(link performance reduced by 5db)

64QAM-max user data, least robust, least range.

DVBT spectrum

inversion

Normal or

Inverted

Default is Normal. You would only use inverted if

you were using a non compliant down converter

that inverted the COFDM spectrum.

DVBT 4KHz offset

None, +4KHz or -

4KHz.

A legacy feature to overcome extremely narrow

band interference. Enables the whole DVBT

frequency to be shifted a very small amount to

counter this problem.

Network Name

Solo is the default

value. Can be

anything.

This name simply differentiates one digital service

from another.

10.6.4 Power Settings (3)

These settings enable you to configure some preset radio settings and control the power

output. This can be useful for a quick radio setup and also for attenuating a radio quickly

for use with a power amplifier for example.

Unit Parameter

Options

Notes

Preset transmit

mode

None Selected,

Short range,

Medium range,

Long range,

Ultra long range,

Extra long range 1

Extra long range 2

This simply populates the Radio Settings

section of the advanced options window with

preset values (See Note-(1))

Output power

Low or High

Presets: 10, 50,

100, 200 and

500mW

How much RF power you want the transmitter to

emit.

Output

attenuation high

0 is default

If you have selected High Output power above

then the attenuation here will apply.

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