Gai-tronics MRTI 2000 (No. PL1877A) Microprocessor Radio Telep Manual de usuario descargar pdf (Pagina 23)

PL1877A Microprocessor Radio Telephone Interconnect Installation

17 12/10

Level Setting

A service monitor or communications system analyzer is required for level setting adjustments. Connect

the radio’s antenna connector to the communications analyzer and a 50-ohm load. Set the equipment to

monitor deviation at the radio’s transmit frequency.

It is necessary to enter the diagnostic test mode for some of the level setting. To enter diagnostic mode,

press both the UP and DOWN buttons simultaneously. To step to another test once the diagnostic mode

has been entered, press the

PATCH ON/OFF button. To exit, press both the UP and PATCH ON/OFF

buttons simultaneously. (For more information on diagnostic test mode refer to the Internal Diagnostic

section in this manual.)

Transmitter Audio Level

The following procedure is for setting and measuring transmitter modulator/IDC circuit performance and

overall quality of the landline to mobile audio.

Before proceeding, disable the Private Line encoder output of the transmitter, if used. This may involve

removing the PL code plug in older model radios. For newer model radios, select a carrier squelch mode,

if available, or temporarily program the station to generate carrier only without PL/DPL. If the PL

STRIP function has been properly wired to the station, it is not necessary to perform the above mentioned

procedure. Simply verify that the transmitter is not sending PL/DPL while testing.

Enter diagnostic Test 1 by pressing both the

UP and DOWN buttons simultaneously. This procedure also

activates PTT, and generates a 1000 Hz tone to the transmitter.

If the PL STRIP function has been wired to the station, the transmitter should key and cause the station to

transmit without generating Private Line codes. Adjustment of the transmit level should be made by

pressing the

UP or DOWN buttons as needed to produce 60% system deviation. Adjust the level to

produce 3 kHz deviation, as indicated by the deviation monitor, for standard 5 kHz deviation radios. For

split channel, narrow-band radios, set the level to produce 1.5 kHz deviation.

After the desired deviation level has been achieved, press the

PATCH ON/OFF button. The value set

remains stored in memory unless it is again changed through an adjustment in Test 1. Exit the test by

pressing the

UP and PATCH ON/OFF buttons simultaneously.

Carrier Detect Adjustments

Logic Carrier Detect

If using the logic carrier detect input, (most recent radios models use this mode) the parameters must be

set as follows:

1 = 1 (RX audio is post de-emphasis, or speaker (muted) source.)

2 = 1 or 0 (Set to match the available level from receiver, refer to Receiver Input Audio Level.

3 = 1 (External logic level carrier detect.)

4 = 1 or 0 (Must be set to match the logic polarity available from the radio. Consult the radio manual or

programming software to determine the polarity of the logic carrier detect output.)

Other parameters must be set as the system requires. Verify the proper selection of RX audio source

from the radio. Some radios, such as the GM300 and MaxTrac Series radios require the positioning of an

internal jumper to select muted, post de-emphasized audio. (JU551 in the “B” position in these models.)

Refer to the radio’s technical manual for information on internal jumpers.

Enter diagnostic Test 3 by pressing both the

UP and DOWN buttons simultaneously. Press the PATCH

ON/OFF button until Test 3 is reached.

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