COBHAM H264ENC Guia do Utilizador descarregar pdf (Página 83)

SOLH264TX Broadcast Transmitter

H264TX, H264ENGTX, H264ENC

UNCLASSIFIED

Part A - User Guide

DS000091

Rev 1.2 2013-05-02

UNCLASSIFIED

Page 10-73

10.6.1 Radio Settings (1)

Unit Parameter

Options

Notes

Output frequency

(MHz)

L, S C and X

Bands

The frequency in Megahertz (MHz) that you want

to use for this preset.

If you try to input a frequency that is out of

range, the radio will tune the lowest available

frequency automatically.

Modulation

bandwidth

6, 7 & 8MHz

2.5MHz

1.25MHz

625kHz

DVB-T bandwidths (normally broadcast)

Cobham narrowband (this is a licensable feature,

normally surveillance use)

Cobham Ultra-narrowband (this is a licensable

feature, normally surveillance use)

Cobham Extra-Narrowband (this is a licensable

feature, normally surveillance use)

Modulation

output

Off or On

Switches the RF modulation on & off (same as the

RF button on the unit)

Narrowband FEC

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 therefore

2 bits are used for error correction.

Little user data means less picture quality, but

more error correction means a more robust signal

and therefore more range.

2/3 means 2 bits out of 3 bits are data and

therefore 1 bit is used for error correction.

More user data means better picture quality, but

less error correction means less robust signal and

therefore less range.

Narrowband

guard interval

1/16 or 1/8

The guard interval which is being applied to the

narrowband mode in use.

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.

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