Tektronix MTM400 Manual do Utilizador descarregar pdf (Página 171)

Interface Configuration and Interpretation

MTM400 MPEG Transport Stream Monitor User Manual 3-127

IF Spectrum This can be set to Normal or Inverse, to allow for frequency

conversions in the signal chain. Conversions that use difference

frequencies invert the spectrum; additive conversions do not.

Channel State Available options are auto, static, dynamic and fast dynamic.

Using these options you can match the receiver equalizer to the

expected channel conditions. The recommended default setting

is auto.

NTSC Rejection Filter

This setting gives you control over the integrated cochannel

NTSC reject filter. Options are on, off and auto. The

recommended default setting is auto.

Carrier Lock

This setting allows you to control the carrier lock range. The

Normal setting allows lock over a ±150 kHz range; Wide

extends the range to ±500 kHz. The recommended default

setting is Normal.

Tuner Phase Noise

Normal and High. This control modifies the carrier loop

bandwidth to allow the acquisition of nosiy carriers. Normal

mode is recommended for general use.

Signal Detection NTSC (National Television Standards Committee) and VSB

(Vestigial Side Band).

Front End Lock

If full lock is acquired onto the channel and it is receiving the

signal correctly, the Front End Lock (FEL) indicator will light

up green. When a signal is present but no lock is achieved, the

indicator is red. When no signal is found, the indicator is gray.

BER BER is displayed, measured before the Reed Solomon forward

error correction block.

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Tektronix MTM400 Manual do Utilizador Página 171