Glenayre Electronics Inc. GL-T8600-CN Manual Do Utilizador

Glenayre Document Number: 9110.00172

DSP Exciter

Issue 1, Rev. I: 01/15/97

MAINTENANCE

Print Date: 02/19/97

Page: 7-1

sec_

MAINTENANCE

7.1

Location of Maintenance Procedures

The DSP exciter is central to performing transmitter maintenance. Most maintenance of
electrical assemblies is done via the VT100 interface. Any maintenance procedures which
require adjusting controls within the exciter chassis are listed in this section.

Replace the exciter if it has input power, as indicated by the front-panel LED, but does not
allow the user to make connection via the VT100 interface.

7.2

Test Equipment Required

Table 4-1, Test Equipment Required

, lists test equipment required to perform mainte-

nance procedures.

7.3

VCO-2 Adjustment Procedure

Perform the VCO-2 adjustment procedure after installing new VCO/RF amplifier board or
after setting new channel carrier frequency. If the transmitter is to operate at more than one
frequency, perform the multichannel adjustment procedure. If the transmitter is to operate
at only one frequency, perform the single-channel adjustment procedure. Refer to the DSP
exciter VDT manual as necessary.

7.3.1

VCO-2 Multichannel Adjustment Procedure

Set up VT-100 VDT and select local control (see VDT manual).

Select transmitter channel of lowest frequency if not already selected.

Use tuning tool supplied to adjust

VCO ADJ

control through exciter front panel. Ad-

just for a reading of 4.0 volts (3.5 volts for wideband VCO 263-0082-062), on VCO2
status display.

Return transmitter to service.

Procedure is complete.

7.3.2

VCO-2 Single-Channel Adjustment Procedure

This procedure does not apply to wideband option.