Tait T800 SL2 25W, Service Manual

Page: 45 / 383

M8SL2-00-002-812
T855 Initial Tuning and Adjustment B3.1
© Copyright Tait Electronics Limited August 2004. All rights reserved.
3 T855 Initial Tuning and Adjustment
Caution:
This equipment contains CMOS devices which are susceptible to dam-
age from static charges. Refer to Section 1.2 in Part A for more informa-
tion on anti-static procedures when handling these devices.
The following section describes both short and full tuning and adjustment procedures
and provides information on:
• channel programming
• selecting the required audio links
• synthesiser alignment
• receiver front end and IF alignment
• noise and carrier level mute adjustment
• setting the line and monitor output levels
• setting up the RSSI.
Note: Unless otherwise specified, the term “PGM800Win” used in this and follow-
ing sections refers to version 4.02 and later of the software.
Refer to Figure 4.3 which shows the location of the main tuning and adjustment con-
trols. Refer also to Section 6 where the parts lists, grid reference index and diagrams will
provide detailed information on identifying and locating components and test points on
the main PCB. The parts list and diagrams for the VCO PCB are in Part E.
Section Title Page
3.1 Introduction 3.3
3.2 Channel Programming 3.3
3.3 Test Equipment Required 3.4
3.4
3.4.1
3.4.2
3.4.3
3.4.4
3.4.4.1
3.4.4.2
3.4.5
3.4.6
3.4.6.1
3.4.6.2
3.4.6.3
3.4.7
Short Tuning Procedure
Introduction
Synthesiser Alignment
Front End Alignment
Mute Adjustment
Noise Mute
Carrier Level Mute
Line Amplifier Output
CTCSS
Decoder Operation
Opening Sinad
High Pass Filter
RSSI (If Fitted)
3.5
3.5
3.5
3.5
3.6
3.6
3.6
3.6
3.7
3.7
3.7
3.7
3.8