Barracuda Networks SP4 Uživatelský manuál stáhnout pdf (Strana 19)

GENERAL DESCRIPTION

ENG

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www.axeltechnology.com

SYNC-OUT

OUTPUT

This TTL-level (5Vpp) 19 kHz square wave output can be used as the reference signal

for any SCA generator that operates at 57 kHz or other multiple of the 19 kHz pilot

frequency. Using the 19 kHz clock from the Shark makes it much easier to phase lock

the

external signal to the pilot frequency. This is extremely helpful in order to remove

intermodulation components. For RDS coders, this feature is also very useful.

The Sync Output is disabled

by default (see par. Output Sync in the MPX menu).

SECONDARY MPX

‘OUTPUT’

(MPX 2)

It replicates, through an indipendent ‘buffer’, the same MPX signal available on

MPX Output 1. Proper load impedance is 50 Ohms.

MAIN ‘OUTPUT’

(MPX 1)

This is the Main MPX and/or RBDS/RDS (with or without signals injected from Aux 1

and 2 mixed into). You can adjust the overall

output level through the menu (MPX

Level control in the MPX MODULE SETUP page) in the – 9 dBm to +15dBm range.

Factory preset: 0 dBm (2.2 Vpp). This output can provide a reference tone consisting

of a 500 Hz / 0 dBm sinusoidal signal. This tone corresponds to the maximum

frequency deviation. To enable it, see Peak Ref Tone in MPX Module Setup / Output

Mode menu.

AUXILIARY INPUT

‘AUX IN 1-MPX’

The AUX-1

inputs allow the Mpx, SCA, RDS injection from external coders. The

resultant signal (f.i. external RDS+ auto-generated MPX) is available on the Output

connector. The level of the injected signal may be adjusted by means of the trimmer

next to the corresponding BNC connector (no software control is provided

In the RDS-only version, You may use this input to inject an external MPX signal

or a Pilot tone 19 KHz as a reference for RDS generation.

for this

purpose). This trimmer is factory preset for a gain of 0 dB.

To enable this input, see MPX block Diagram and Jumper J3 setting.

NOTE: When using an external RDS encoder, the internal RDS one must be

disabled. Suggested RDS injection level is -31.5 dBm (≈ 60mVpp / 2.0 kHz deviation)

in relation to an MPX output of 0 dBm

AUX Input impedance is 10 KOhm. This is the input for

(2.2 Vpp, 0.776 Vrms).

Spliitng Option

AUXILIARY INPUT

‘AUX IN 2-RDS’

The AUX-2 inputs allow the

SCA, RDS injection from external coders. The resultant

signal (f.i. external RDS+ auto-generated MPX) is available on the Output connector.

The level of the injected signal may be adjusted by means of the trimmer next to the

corresponding BNC connector (no software control is provided for this purpose). This

trimmer is factory preset for a gain of 0 dB. In the RDS-only version, You may use

this input to inject an external MPX signal or a Pilot tone 19 KHz as a reference

for RDS generation. To enable this input, see MPX block Diagram and Jumper

J3 setting. NOTE: When using an external RDS encoder, the internal RDS one

must be disabled. Suggested RDS injection level is -31.5 dBm (≈ 60mVpp / 2.0 kHz

deviation) in relation to an MPX output of 0 dBm

AUX-2 Input impedance is 10 KOhm.

(2.2 Vpp, 0.776 Vrms).

ANALOG AUDIO

INPUT

Balanced XLR-type connectors are used for input analog audio.

The stereo analog inputs are designed for standard 0 dBu balanced signals. Individual

channel gain and level setting is done using the software parameter settings (see

INPUT CALIBRATION menu). In case of unbalanced connections, please connect the

cold pole (Pin 3) to the ground (Pin 1).

Factory preset input impedance is 10 kOhm.

This impedance may also be set to 600Ohm by moving the two internal jumpers on

the INPUT board (see Chapter 17- hardware settings).

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