Barracuda Networks SP4 Manuel d'utilisateur télécharger pdf (Page 95)

TECHNICAL SPEC

ENG

Axel Technology srl

www.axeltechnology.com

MPX (STEREO) GENERATOR

Signal processing is performed by phase linear filters / all measurements referenced to 100% modulation unless

otherwise noted. Barracuda version only.

Pilot Frequency

19 KHz +/- 1Hz

Pilot Injection

Adj from –25.0 dB to –15.5 dB (0.1 dB step); 6 to 18% of total

deviation

Pilot Stability:

10 ppm (-10 to +55 °C)

Pilot Phase

Adjustable +/- 12 deg. (1 deg step)

Pilot distortion

0.05 % (typical)

Pilot distortion + Noise

0.068% (on 100Khz Band)

S/N

> 90 dB (on 100 kHz band)

Composite out THD

0.005 % (typical on the whole band)

Stereo Separation

>70 dB (typical on the whole band)

Linear Crosstalk:

>–80 dB, main channel to sub-channel or sub-channel to main

channel (referenced to 100% modulation).

Composite Clip Drive:

+0.0 to +6.0dB (0.1dB step), software controlled (manually or

automatically)

Digital filtering / band

30 Hz to 15 kHz (-0.1 dB), 17 kHz (-70 dB), 19 kHz (-100 dB)

57 kHz (RDS/RBDS) Protection

Better than 51 dB

Crosstalk Main to Sub / Sub to Main

> 65 dB (minimum)

38KHz suppress.

< - 80dB (typical)

Pre-emphasis

Off, 50uS, 75uS (+-0.1dB)

Freq Response

±0.3 dB (30Hz-15kHz)

Operation

Mono /Stereo

TEST CONDITIONS: OUT LEVEL = +12dBm, LOAD=600Ohm, PILOT LEV= -20Db MODE=STEREO

RDS / RBDS ENCODING

MODULATION

RDS Signal generation

DSP-based , compliant to CENELEC EN 50067

RBDS Signal generation

DSP-based , compliant to United States NRSC

Coding

Differential and bi-phase

Modulation

Amplitude modulation double side band, with suppressed carrier

Subcarrier frequency

57 kHz

3 Hz

Bandwidth

± 2.5 kHz (- 60 dB)

± 3.0 kHz (- 80 dB)

Linear Distortion

0.01 dB

RDS / RBDS output level

0 ÷ 1200 mVpp (10 mVpp steps)

RDS phase

adj

120 deg (referred to MPX pilot). 1 deg step

Synchronization

Either to external 19Khz pilot tone or to external FM stereo Mpx

signal. Automatic switchover to internal oscillator in case of absence

or low quality of external reference signal

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Barracuda Networks SP4 Manuel d'utilisateur Page 95

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