BTC Z22 Manual do Utilizador descarregar pdf (Página 32)

Version 02.00, November 2014

32 Rohde & Schwarz R&S

BTC Broadcast Test Center

Analog modulation systems

AM/FM/RDS (R&S

BTC-K570 option)

FM operating modes

stereo, mono

audio signals

internal audio signal generator

see audio signal generator and audio

player

AF frequency range

30 Hz to 15 kHz

AF frequency response

< 0.2 dB

attenuation at 19 kHz

> 70 dB

preemphasis

off, 50 µs, 75 µs

FM stereo

stereo operating modes

L, R, L = R, L = –R, L ≠ R

internal RDS signal generation, MPX and

RDS signals can be generated

simultaneously

MPX frequency deviation

deviation

0 Hz to ±100 kHz

resolution

1 Hz

stereo crosstalk attenuation

> 50 dB (at AF = 30 Hz to 15 kHz)

total harmonic distortion

< 0.1 % (at 60 kHz audio frequency

deviation, AF = 1 kHz)

SNR (stereo/RDS signal)

at ±40 kHz audio frequency deviation

ITU-R weighted (quasi-peak)

> 64 dB

ITU-R unweighted (RMS)

> 70 dB

pilot tone

frequency

19 kHz ±1 Hz

deviation

0 Hz to ±15 kHz

resolution

1 Hz

phase

0º to ±180º

resolution

0.1º

RDS

subcarrier frequency

57 kHz ± 3 Hz

deviation

0 Hz to ±10 kHz

phase

0º to ±180º

resolution

1 Hz

FM mono

mono frequency deviation

deviation

0 Hz to ±100 kHz

resolution

1 Hz

total harmonic distortion

< 0.1 % (at ±67.5 kHz audio frequency

deviation, AF = 1 kHz)

audio signals

internal audio signal generator

see audio signal generator and audio

player

AF frequency range

30 Hz to 15 kHz

AF frequency response

< 0.2 dB

modulation

modulation depth

0 % to 100 %

modulation resolution

0.1 %

AM total harmonic distortion

at AF = 1 kHz

m = 30 %

< 0.2 %

m = 80 %

< 0.2 %

Generator and receiver without preemphasis/deemphasis.

Generator without preemphasis, receiver with deemphasis, and left/right input signal source set to audio generator.

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BTC Z22 Manual do Utilizador Página 32

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