User's Manual

68P80801H45-1 1/20/2002 51

EBTS System Manual - Vol 2 Troubleshooting

QUAD Base Radio Station Verification Procedures

QUAD BR Transmitter Veriﬁcation

The transmitter veriﬁcation procedure veriﬁes the transmitter operation and the

integrity of the transmit path. This veriﬁcation procedure is recommended after

replacing an Exciter, Power Ampliﬁer, BRC, or Power Supply module.

NOTE

The following procedure requires the Base Radio to be

out of service. Unless the Base Radio is currently out

of service, Motorola recommends performing this

procedure during off-peak hours. This minimizes or

eliminates disruption of service to system users.

Equipment Setup

To set up the equipment, use the following procedure:

1. Remove power from the Base Radio by setting the Power Supply rocker

switch (located behind the front panel of the Power Supply) to the OFF (0)

position.

2. Connect one end of the RS-232 cable to the service computer.

3. Connect the other end of the RS-232 cable to the STATUS port located on the

front panel of the BRC.

CAUTION

Make sure power to BR is OFF before disconnecting

transmitter RF connectors. Disconnecting transmitter

RF connectors while the BR is keyed may result in RF

burns from arcing.

4. Disconnect the existing cable from the connector labeled PA OUT. This

connector is located on the backplane of the Base Radio.

5. Connect a test cable to the PA OUT connector.

6. Connect a 10 dB attenuator (100 W or more average power dissipation) on

the other end of the test cable.

7. From the attenuator, connect a cable to the RF IN/OUT connector on the

R2660 Communications Analyzer.

8. Remove power from the R2660 and connect the Rubidium Frequency

Standard 10MHZ OUTPUT to a 10 dB attenuator.