RF Technology R150 Instruções de Operação descarregar pdf (Página 7)

RF Technology T70/T150 Page 7

2 TRANSMITTER INTERNAL JUMPER OPTIONS 2.5 JP6: Input Level Attenuation

2.5 JP6: Input Level Attenuation

This jumper permits coarse input sensitivity to be set. In the default position, the unit

expects a line level of 0dBm (nominal) at its Line Input. In the alternate position,

levels of +20BdBm (nominal) can be accepted.

Condition Position

0dB attenuation 1-2 *

20dB attenuation 2-3

2.6 JP7: Audio Frequency Response

Condition Position

750 uSec. pre-emphasis 1-2 *

Flat response 2-3

2.7 JP8: Sub-audible Tone Source

Condition Position

Internal CTCSS 1-2, 4-5 *

External input 2-3, 5-6

2.8 JP9/10/11: dc Loop Configuration

Dc loop current on the audio pair is normally sourced externally. The Eclipse exciters

loop the current through an opto-isolator. When the current flows the exciter keys up.

An alternative arrangement is possible. The exciters can source the current and an

external device can provide the dc loop.

These three jumpers select the appropriate mode.

Condition JP9 JP10 JP11

Current Loop Input ON OFF OFF *

+ 12Vdc Loop source OFF ON ON

2.9 JP16: Direct Digital Input (Rev 4 or higher)

Some trunking controllers have digital schemes which operate to very low frequencies.

The elliptical filter, used as a 250Hz low pass filter in the tone section, can cause

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RF Technology R150 Instruções de Operação Página 7