Glenayre Electronics GL-T8600-CN Users Manual

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

DSP Exciter With Wideband Option

USER MANUAL
PN 9110.0 0172 (old part number = 916-T70A-003)
REV I
RELEASED

Specifications subject to change without notice
Copyright © 1997 Glenayre
All rights reserved. No part of this work may be reproduced or copied in any form or by

any means—graphic, electronic, or mechanical, including photocopying, recording,
taping, or information-ret rieva l system— without writte n perm issio n of Glenayre.

Print Date: 02/18/97 Copyright © 1997 Glenayre

DSP Exciter Glenayre Document Number : 9110.00172
Document Change Record Issue 1, Rev. I: 01/15/97

Document Change Record

Issue: 1
Date: 05/09/95
Changes: none, original

Issue: Rev B
Date: 02/07/96
Changes: added wi deband info rmation

Issue: Rev C
Date: 02/29/96
Changes: changed jumpers, d rawi ng main bd

Issue: Rev D
Date: 4/25/96
Changes: changed VCO-2 status reading

Issue: Rev E
Date: 5/14/96
Changes: added Ove r-The-Link an d On-Th e-F l y inf orm at io n

Issue: Rev F
Date: 5/23/96
Changes: added one RU space for reinstallation and net channel change time for setup

Issue: Rev G
Date: 9/03/96
Changes: changed PA fault input pin 11 on Table 4-4

Issue: Rev H
Date: 9/20/96
Changes: revised chapter 4 jumper information, added Table 4-5

Issue: Rev I
Date: 01/15/97
Changes: added and changed VCO board numbers in Tabl e 3 -1

Copyright © 1997 Glenayre Print Date: 02/18/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 Table of Contents

Table of Contents

1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1.1 Manual Scope . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1.1.1 Applicable Docu ment s . . . . . . . . . . . . . . . . . . . . . . 1-1

1.2 Manual Sections . . . . . . . . . . . . . . . . . . . . . . . 1-1

1.3 Exciter Identification . . . . . . . . . . . . . . . . . . . . . 1-1

2 SPECIFICATIO NS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

3 DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

sec_1.toc

3.2 Physical Descript ion . . . . . . . . . . . . . . . . . . . . . 3-1

3.3 Simplified Blo ck-D i agram Descri pti on . . . . . . . . . . . . . . 3-3

4 INSTALL ATI ON AND SETUP . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

4.1 Precautions and Hazards . . . . . . . . . . . . . . . . . . . . 4-1

4.2 Test Equipment and Tools Required . . . . . . . . . . . . . . . 4-1

4.3 Component and Adjustment Locations . . . . . . . . . . . . . . 4-1

4.4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

4.4.1 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

4.4.2 Power Requirement . . . . . . . . . . . . . . . . . . . . . . . . 4-2

5 OPERATIO N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

6 THEORY OF OPERATI ON . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

4.4.3 Input/Output Connections . . . . . . . . . . . . . . . . . . . . 4-2

4.4.4 Signal Functions . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

4.4.5 Switches and Jumpers . . . . . . . . . . . . . . . . . . . . . . 4-3

4.5 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

4.6 Ultimate Disposition . . . . . . . . . . . . . . . . . . . . . 4-4

5.1 Front-Panel Contro ls and Indicators . . . . . . . . . . . . . . . 5-1

5.2 Operating Instructions . . . . . . . . . . . . . . . . . . . . . 5-1

6.1 Exciter/PA Cont rol . . . . . . . . . . . . . . . . . . . . . . 6-1

6.1.1 Reference Source . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

6.1.2 Main Circuit Frequencies . . . . . . . . . . . . . . . . . . . . . 6-1

6.1.3 Controller Interface Connector Functions . . . . . . . . . . . . 6-1

6.2 Interface to Controller . . . . . . . . . . . . . . . . . . . . . 6-3

6.2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

6.2.2 Interface Conversi on Functions . . . . . . . . . . . . . . . . . 6-3

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: -i

DSP Exciter Glenayre Document Number : 9110.00172
Table of Contents Issue 1, Rev. I: 01/15/97

6.3 DSP Modulator . . . . . . . . . . . . . . . . . . . . . . . 6-4

6.3.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

6.3.2 DSP Modulator Signal Flow . . . . . . . . . . . . . . . . . . . 6-4

6.4 IF Stage . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

6.4.1 Mixer-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

6.4.2 Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

6.4.3 VCO-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

6.4.4 Synthesizer-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

6.5 MCU . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8

6.5.1 Microcontroller Unit (MCU ) . . . . . . . . . . . . . . . . . . . 6-8

6.5.2 Digital-to-Analog (D/A) Converter . . . . . . . . . . . . . . . 6-9

6.5.3 8/16-Bit Converter . . . . . . . . . . . . . . . . . . . . . . . . 6-9

6.5.4 Read-Only Memory . . . . . . . . . . . . . . . . . . . . . . . 6-9

6.5.5 VSWR-Fault Detector . . . . . . . . . . . . . . . . . . . . . 6-14

6.5.6 Alarm Data-to-Logic Conversion . . . . . . . . . . . . . . . 6-14

6.6 RF Assemblies . . . . . . . . . . . . . . . . . . . . . . 6-14

6.6.1 RF Stage Loc ation . . . . . . . . . . . . . . . . . . . . . . . 6-14

6.6.2 RF Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . 6-14

6.7 Voltage Regulator Circuit . . . . . . . . . . . . . . . . . . 6-16

7 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

7.1 Location of Mainten ance Procedu res . . . . . . . . . . . . . . 7-1

7.2 Test Equipment Required . . . . . . . . . . . . . . . . . . . 7-1

7.3 VCO-2 Adjustm ent Proced ure . . . . . . . . . . . . . . . . . 7-1

7.3.1 VCO-2 Multichanne l Adjustme n t Procedure . . . . . . . . . . 7-1

7.3.2 VCO-2 Single-Cha nnel Adjust men t Procedure . . . . . . . . . 7-1

7.4 Over-The-Link Downloading . . . . . . . . . . . . . . . . . 7-2

7.5 On-The-Fly Channel/Mode Changing . . . . . . . . . . . . . . 7-2

7.5.1 Programming Example . . . . . . . . . . . . . . . . . . . . . . 7-3

7.6 16-Channel Operation . . . . . . . . . . . . . . . . . . . . 7-4

7.7 On-The-Fly Interface . . . . . . . . . . . . . . . . . . . . . 7-5

8 CHEC KOUT AND TROUBL ESHOO TING . . . . . . . . . . . . . . . . . . 8-1

8.1 CHECKOUT . . . . . . . . . . . . . . . . . . . . . . . . 8-1

8.2 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . 8-1

Page: -ii Copyright © 1997 Glenayre Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 Table of Contents

9 REMOVAL AND REINST AL LAT ION . . . . . . . . . . . . . . . . . . . . 9-1

9.1 Exciter/PA Control Ch as sis . . . . . . . . . . . . . . . . . . . 9-1

9.1.1 Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . 9-1

9.1.2 Reinstallation Procedure . . . . . . . . . . . . . . . . . . . . . 9-1

9.2 Exciter Cover . . . . . . . . . . . . . . . . . . . . . . . . 9-2

9.2.1 Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . 9-2

9.2.2 Reinstallation Procedure . . . . . . . . . . . . . . . . . . . . . 9-2

9.3 Exciter/Control Board . . . . . . . . . . . . . . . . . . . . . 9-5

9.3.1 Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . 9-5

sec_1.toc

9.3.2 Reinstallation Procedure . . . . . . . . . . . . . . . . . . . . . 9-5

9.4 Interface Board . . . . . . . . . . . . . . . . . . . . . . . 9-8

9.4.1 Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . 9-8

9.4.2 Reinstallation Procedure . . . . . . . . . . . . . . . . . . . . . 9-8

9.5 VCO/RF Amplifier B oard . . . . . . . . . . . . . . . . . . . 9-8

9.5.1 Removal Procedure . . . . . . . . . . . . . . . . . . . . . . . . 9-9

9.5.2 Reinstallation Procedure . . . . . . . . . . . . . . . . . . . . . 9-9

10 OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1

10.1 Exciter/PA Cont rol with QT-1000 Interface . . . . . . . . . . . 10-1

10.1.1 Reference Source . . . . . . . . . . . . . . . . . . . . . . . . 10-1

10.1.2 Controller Interface Connector Functions . . . . . . . . . . . 10-1

10.1.3 QT-1000 Interface Conversion Functions . . . . . . . . . . . 10-1

10.2 Exc i te r/PA Co n t rol wit h St an d ard Int erf ace . . . . . . . . . . . 10-5

10.2.1 Reference Source . . . . . . . . . . . . . . . . . . . . . . . . 10-5

10.2.2 Controller Interface Connector Functions . . . . . . . . . . . 10-5

10.2.3 Standard Interfa ce Conversio n Function s . . . . . . . . . . . 10-5

10.3 E xc i te r/PA Con t rol with I20 Interface . . . . . . . . . . . . . 10-8

10.3.1 Reference Source . . . . . . . . . . . . . . . . . . . . . . . . 10-8

10.3.2 Controller Interface Connector Functions . . . . . . . . . . . 10-8

10.3.3 I20 Interface Conversion Functions . . . . . . . . . . . . . . 10-9

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: -iii

DSP Exciter Glenayre Document Number : 9110.00172
Table of Contents Issue 1, Rev. I: 01/15/97

Page: -iv Copyright © 1997 Glenayre Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 List of Figures

List of Figures

Figure 1-1 DSP Exciter Isometric View . . . . . . . . . . . . . . . . . . . . . . . 1-2

Figure 3-1 DSP Exciter Rear View . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Figure 3-2 DSP Exciter Top View

with Internal Controls and Indicators . . . . . . . . . . . . . . . . . . 3-5

Figure 3-3 DSP Exciter Simplified F unctional Diagram . . . . . . . . . . . . . . 3-6

Figure 4-1 DSP Exciter/PA Control Circuit Boards

Interconnection Diagram . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Figure 5-1 F ront -Pan el C ontrol s and Indicat ors . . . . . . . . . . . . . . . . . . . 5-2

sec_1.lof

Figure 6-1 DSP Exciter RF Stage Functional Diagram . . . . . . . . . . . . . . . 6-2

Figure 6-2 DSP Exciter MCU Circuit Functional Diagram . . . . . . . . . . . . . 6-6

Figure 6-3 DSP Exciter-to-C o ntroller Functio nal Diagram . . . . . . . . . . . . 6-10

Figure 6-4 DSP Exciter Detailed Functional Diagram . . . . . . . . . . . . . . . 6-12

Figure 6-5 DSP Exciter IF-Stage Detailed

Functional Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13

Figure 7-1 On-T he-Fl y C20 00 Control Lines to DSP Exciter . . . . . . . . . . . . 7-5

Figure 9-1 DSP Exciter Chassis Removal

and Reinstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3

Figure 9-2 DSP Exciter Cover Removal

and Reinstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-4

Figure 9-3 DSP Exciter Control Board Removal and Reinstallation . . . . . . . . 9-7

Figure 9-4 DSP Exciter External Interface I/O Board

Removal and Reinstallation . . . . . . . . . . . . . . . . . . . . . . 9-10

Figure 9-5 DSP Exciter Interf ace Board Removal and Reinstallation . . . . . . . 9-11

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: -v

DSP Exciter Glenayre Document Number : 9110.00172
List of Figures Issue 1, Rev. I: 01/15/97

Page: -vi Copyright © 1997 Glenayre Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 List of Tables

List of Tables

Table 1-1 Manual Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Table 2-1 Exciter Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Table 3-1 Part Numbers of VCO/R F Ampli f ier Bo ard s . . . . . . . . . . . . . . . 3 -1

Table 3-2 Part Numbers of Interfac e Boa rd s . . . . . . . . . . . . . . . . . . . . 3 -2

Table 3-3 Part Numbers of Interfac e I/O Boa rd s . . . . . . . . . . . . . . . . . . 3- 2

Table 3-4 Assembly and Control Board Numbers. . . . . . . . . . . . . . . . . . 3-3

Table 4-1 Test Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Table 4-2 DSP Exciter I/O Connectors . . . . . . . . . . . . . . . . . . . . . . . 4-2

sec_1.lot

Table 4-3 VT100 Interface Connector J3 Pin Assignments . . . . . . . . . . . . . 4- 3

Table 4-4 Control Board Connector J6 Pin Assignments . . . . . . . . . . . . . . 4-3

Table 4-5 Exciter Control Board Jum per Posi tio ns . . . . . . . . . . . . . . . . . 4-4

Table 6-1 Exciter RF/Main Circuit Frequencies. . . . . . . . . . . . . . . . . . . 6-1

Table 7-1 Deviation and Offset Programming. . . . . . . . . . . . . . . . . . . . 7-3

Table 10-1 Interface Board Connector J4 (QT-1000). . . . . . . . . . . . . . . . .10-3

Table 10-2 Receiver Connector J5 Pin Functions

(QT-1000 with external I/O board) . . . . . . . . . . . . . . . . . . . .10-4

Table 10-3 Remote Select Input vs. Channel (QT-1000) . . . . . . . . . . . . . . .10-4

Table 10-4 Remote Select Input vs. Mode (QT-1000) . . . . . . . . . . . . . . . . 10-4

Table 10-5 Interface Board Connector J4 (Standard) . . . . . . . . . . . . . . . . . 10-7

Table 10-6 Remote Select Input vs. Channel (standard) . . . . . . . . . . . . . . .10-7

Table 10 -7 Remot e Selec t In put vs. Mod e (stan da rd ) . . . . . . . . . . . . . . . .10-8

Table 10-8 Interface Board Connector J1. . . . . . . . . . . . . . . . . . . . . . 10-10

Table 10-9 Interface Board Connector J2. . . . . . . . . . . . . . . . . . . . . . 10-11

Table 10-10 Remote Select Input vs. Channel (I20) . . . . . . . . . . . . . . . . . 10-11

Table 10-11 Remote Select Input vs. Mode (I20) . . . . . . . . . . . . . . . . . . 10-11

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: -vii

DSP Exciter Glenayre Document Number : 9110.00172
List of Tables Issue 1, Rev. I: 01/15/97

Page: -viii Copyright © 1997 Glenayre Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 GENERAL

1 GENERAL

1.1 Manual Scope

This manual is intended for use as a technical reference guide to the Glenayre DSP exciter
and contains information on exciter connection, setup, and maintenance.

1.1.1 Applicable Documents

Applicable Glenay re documen ts are listed in the applicable system manu a l.

sec_1

1.2 Man ual Sections

Refer to Table 1-1, Manual Contents. Also refer to table of contents in this manual.

Table 1-1 Manual Contents

section No. and title contents

1 General this section
2 Specificati ons exciter specifications

Refer to F igure Figure 1-1, DSP Exciter Isometric View, for an overall view of the
exc iter.

3 Descriptions listing of options and assemblies covered, simplified description, physical

4 Installation and Setup exciter installation, setup, and lists of connections
5 Operation list, descript ion , and locati on of operat o r cont rols an d indi cat ors
6 Theory of Operation assembly-level description of exciter operation
7 Maintenance exciter maintenance
8 Checkout and Troubleshooting exciter checkout and troubleshooting
9 Removal and Reinstallation procedures for removing and reinstalling exciter and exciter assemblies
10 Options l ist and disc u ssi on of user select able opt ions

1.3 Excite r Ide nt ific ation

description, simplified block theory of operation

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 1-1

DSP Exciter Glenayre Document Number : 9110.00172
GENERAL Issue 1, Rev. I: 01/15/97

v0250.hgl

Figure 1-1 DSP Exciter Isometric View

Page: 1-2 Copyright © 1997 Glenay re Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 SPECIFICATIONS

2 SPECIFICATIONS

Refer to Table 2-1, Exciter Specifications, which lists the DSP exciter specifications.

Where po ssible , EIA or I-EI S A m easu ring m ethod s w ere use d i n det ermini ng spec ifica ­tions. Note that some specifications are not addressed by either set of standards or the
prescribed methods were impractical.

Table 2-1 Exciter Specifications

sec_2

characteristic condition specification

adjacent-channel noise 25-kHz channel spacing, in analog mode -85 dBc

25-kHz channel spacing, in FSK mode -75 dBc

alternate channel noise 25-kHz channel spacing -95 dBc

spurious -90 dBc
operating frequ enc y ran g e determine d by installed VCO/RF boa rd refer to Table 3- 1
RF output powe r keyed 250 mW nominal
carrier frequency stability steady state, -30° to

FSK frequency/modulation stability relative to carrier fre que ncy stabil it y +/- 10 Hz max
FSK adju stm en t accura cy +/- 10 Hz
analog offse t reso lu tio n 1 Hz
number of channels up to 8, depending on interface board and

+60° C

10-MHz reference, int=0.005 ppm/yr,
ext=0.1 ppm/ yr

controller

frequency spread 3 MHz at 900 MHz (12 MHz wideband

option)

7.5 MHz at 450 MHz
5 MHz at 150 MHz

audio input level -25 to +10 dBm

impedance with transform er 600 ohm or 5 kohms balanced

audio respon se flat, 50 to 2800 Hz; not referenced to 1

kHz; 60% deviation
preemphasized 6 dB per octav e, 30 0 to

3000 Hz; 60% deviation

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 2-1

+/-0.5 dB

+/-0.75 dB

DSP Exciter Glenayre Document Number : 9110.00172
SPECIFICATIONS Issue 1, Rev. I: 01/15/97

Table 2-1 Exciter Specifications (continued)

characteristi c c ondi tion specificatio n

audio distortion (1-kHz refere nce at

25-kHz channel spacing l es s than 1.5%

60% de viation)

audio response (tracking between
units)

FM hum and noise (1-kHz reference
at 60% deviation)

level 0.1 dB max
delay 2 usec max
25-kHz spacing flat, 15-kHz bandwidth -40 dB
25-kHz channel spacing preemphas ized,

-55 dB

300 to 3000 Hz

AM hum and noise standard -34 dB
modulation types analog, 2-level FSK, 4-level FSK avail-

able with some interfaces
channel spacing 6.25 kHz
audio - back w a rd co m pa t ibil i ty standa r d
emissions FCC 15K0F2D, 16K0F1D, 16K0F3E

power requireme nt 22-29 Vdc less than 3 A
humidity noncondensing 0 to 95% relative

external 10-MHz referen ce inpu t level 2Vp-p min

impedance 50 ohms
spurious above 8 MHz -65 dBc max

spurious below 8 MHz -50 dBc max
weight 4.8 lb (2.2 kg)
dimensions 8.75 in (2 2.25 cm) d x 1 9 in (48.25 cm) w

x 1.75 in (4.5 cm) h

temperature range operating (nonderated) -30° to +60° C

storage -55° to +70° C
maximum elevation to 10,000 ft (3050 m)

Page: 2-2 Copyright © 1997 Glenay re Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 DESCRIPTION

3 DESCRIPTION

3.1 Introduction

The DSP exciter contains a microprocessor that allows remote or local control of the exciter
and consolidates logic for vary ing degrees of PA control and monitoring through a video
display terminal (VDT). Operating characteristics of the exciter are controlled by the
selection of hardware options. It is frequency selectable by specifying the appropriate
interna l frequ ency determining hardware an d soft ware. It is a lso cap able of c ommunica ting
with several ope rat ing protoc ol s thro u gh the proper sele ctio n of int erf ace boards.

sec_3

3.2 Physical Description

The exciter fr ont pan el of one R U (1.75 in) i n he igh t cont ai ns e ight LEDs, two adjustments ,
and one connector (also see section 5). The exciter chassis is nine inches deep and contains
three circuit board s and space for an oscilla tor (not used wit h some contro llers).

Refer to Table 3-1, Part Numbers of VCO/RF Amplifier Boards, which shows
subassemblies used for various transmitter operating ranges.

transmitter model

GL-T85/8601 929-941 263-0082-072 265-0082-001

GL-T85/8600 900-960 (wb) 263-0082-051/052/053/054/

Table 3-1 Part Numbers of VCO/RF Amplifier Boards

control board
VCO/RF-amplifier board
frequency band (MHz)

936-948 263-0082-070 265-0082-001
924-936 263-0082-069 265-0082-001

948-960 263-0082-055 265-0082-001

VCO board assemb ly part
No.

055/062

assembly part

No.

265-0082-024/032

936-948 263-0082-054 265-0082-001
929-941 263-0082-068 265-0082-001
924-936 263-0082-053 265-0082-001

GL-T8541 445-470 263-0084-003 not yet available
GL-T83/85 31 320-330 263-0082-049 265-0082-001
GL-T83/85 21 275-285 263-0082-047 265-0082-001
GL-T84/8611 167-175 2100.00094 265-0082-02 4

162-172 2100.00093 265-0082-02 4

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 3-1

DSP Exciter Glenayre Document Number : 9110.00172
DESCRIPTION Issue 1, Rev. I: 01/15/97

Table 3-1 Part Numbers of VCO/RF Amplifie r Bo ards (continued)

control board

transmitter model

VCO/RF-amplifier board
frequency band (MHz)

VCO board assemb ly part
No.

assembly part
No.

157-167 2100.00092 265-0082-024
152-162 2100.00091 265-0082-024
147-157 2100.00090 265-0082-024
142-152 2100.00089 265-0082-024
138-148 2100.00088 265-0082-024

Refer to Table 3-2, Part Numbers o f Interface Boards.

Table 3-2 Part Numbers of Interface Boards

DSP exciter-to-contro ller interface bo ard s interface board part No.

QT-1000 interface bd 265-0082-007
standar d Interface bd 263-0082-03 6
I20 interface bd 265-0082-032

Refer to Figure 3-1, DSP Exciter Rear View, which show s the exciter rear panel. The
back panel contains three BNC -type connectors J3/J7/J8, a DB-15 connector J6, and a
terminal board TB1 as standard items. Other back panel connectors vary depending on
which interface and I/O boards are installed. Figure 3-2, DSP Exciter Top View with
Internal Controls and Indicators, shows a top view of the exciter with its cover removed.

Refer to Table 3-3, Part Numbers of Interface I/O Boards, wh ich sho ws inte rface a nd I/
O board part numbers. T he I/O board s comprise the mean s to connect vario us controlle rs
to the DSP exciter

..

Table 3-3 Part Numbers of Interf ace I/O Boards

interface I/O board (control type ) interface I/O board part No.

QT-1000 Interf ace I/O bd 261-0082-003
Standard Interface I/O bd 261-0082-004
I20 Interface I/O bd pending

Page: 3-2 Copyright © 1997 Glenay re Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 DESCRIPTION

Table 3-4 Assembly and Control Board Numbers

exciter assem bl y No. control board No .

(wb) 2100.00085 265-0082-032
265-0082-021 265-0084-024

3.3 Simplified Block-Diagram Description

Refer to Figure 3-3, DSP Exciter Simplified Functional Diagram, in the following

sec_3

discussion. Inputs from the transmitter controller usually are one or two data bits, two
channel-select bits, and keying input. Outputs to the controller are keying output indicator,
various f au lt out put s, forward - pow e r sam pl e, and re fle ct ed- po w er sample.

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 3-3

DSP Exciter Glenayre Document Number : 9110.00172
DESCRIPTION Issue 1, Rev. I: 01/15/97

v0343.hgl

Figure 3-1 DSP Exciter Rear View

Page: 3-4 Copyright © 1997 Glenay re Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 DESCRIPTION

v0344.hgl

sec_3

Figure 3-2 DSP Exciter Top View

with Internal C ontrols and Indicators

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 3-5

DSP Exciter Glenayre Document Number : 9110.00172
DESCRIPTION Issue 1, Rev. I: 01/15/97

v0251.hgl

Figure 3-3 DSP Exciter Simplified Functional Diagram

Page: 3-6 Copyright © 1997 Glenay re Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 INSTALLATION AND SETUP

4 INSTALLATION AND SETUP

4.1 Precautions and Hazards

Caution

PC boards within this assembly use
static-sensitive components. Follow
IC-handling precautions.

sec_4

The exciter contains internal memory which is
used to characterize exciter operation. Upon
exciter replacement, ensure that replacement
exciter contains appropriate items in its memory.

4.2 Test Equipment and Tools Required

Table 4-1, Test Equipment Required, lists required test equipment. Common hand tools

may also be required for most proced u res.

item d escri ption

tuning tool Johanson 8777 or equivalent
RF power meter Bird model 8327 or equivalent with appropriate RF adapters
voltmeter Fluke model 77 DVM or equivalent
RF dummy load 50-ohm load

Table 4-1 Test Equipment Required

Caution

4.3 Component and Adjustment Locations

Figure 3-3, DSP Exciter Simplified Functional Diagram, s ho ws the location of assem-

blies, i nterna l user-a dju stable cont rols , and I/O locat ions. Note that mos t adjust men ts are
perfo rm ed via th e front-pane l VT100 i nte rface.

4.4 Installation

4.4.1 Inspection

Inspect exciter to ensure air flow is not obstructed and cables and wires are securely
fastened to their respecti ve conn ec tors.

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 4-1

DSP Exciter Glenayre Document Number : 9110.00172
INSTALLATION AND SETUP Issue 1, Rev. I: 01/15/97

4.4.2 Power Requirement

The DS P exciter, when used as a compone nt of a transmitter, dra ws its power from system
wiring. Current draw is less than three amperes at 22 to 29 volts. It is normally powered by
the transmitte r pow er suppl y bu t can be powe red by an auxiliary suppl y.

4.4.3 Input/Output Connections

Figure 3-3, DSP Exciter Simplified Functional Diagram, shows the locations of I/O

connectors; Table 4-2, DSP Exciter I/O Connectors, l ists I/O conne ctors and describes
their functi ons. Norma lly the exciter is d elivered as part of an entire transmitt er and ha s
already been installed in a rack, with all connections already made, except for connections
to equipment that was not installed in the rack before shipment. If I/O connections are
required, re fer to the syst em -in t erco n nec t dia gra m and othe r instru ct ion s in the tran sm it ter
manual.

4.4.4 Signal Functions

See Table 4-2, DSP Exciter I /O Connectors, which referen ce s oth er tables that describe
pin-by-pin functions of multipin connectors. Figure 4-1, DSP Exciter/PA Control

Circuit Boards Interconnection Diagram, shows interconnections among internal

assemblies.

Table 4-2 DSP Exciter I/O Connectors

additional

stencil/connector description

VT100 INTERFACE: J3 VT100 interface to VDT (front) Table 4-3
RF OUT: J3 RF out, on frequency Figure 6-1
QT-1000 interface I/O J4 interface to QT-1000 interface board Table 10-1
QT-1000 interface I/O J5 DB-9 connector, to recei ver Table 10-2
standa rd int erface I /O J 4 i n terface to st anda rd int erfa c e I /O bo ard Table 10-1
GL-C2000 interface I/O J4 interface to GL-C2000 interface I/O board
PA CONTROL : J6 connects to PA Table 4 -4
ISOLATOR IN: J7 VSWR input from PA Figure 3-1
10 MHZ IN: J8 external reference input from interface Figure 3-1
+26 VDC: TB1 exciter input power, +22-29 Vdc Figure 3-1

detail

Page: 4-2 Copyright © 1997 Glenay re Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 INSTALLATION AND SETUP

Table 4-3 VT100 Interface Connector J3 Pin Assignments

J3-X (front) signal descripti on

2 TXD trans mi t data line
3 RXD receive data line
5GND ground
1,4,6,7,8,9 not used

sec_4

Table 4-4 Control Board Connector J6 Pin Assignments

J6-X signal description J6-X signal description

1 A/D 1+ mu ltiplex analog

input from PA No. 1
multiplexer

2 A/D 3+ mu ltiplex analog

input from PA No. 3
multiplexer

3 AGC REF+ G C reference voltage

4 PA GROUND no connection 12 PA GROUND no connection
5 PA GROUND no connection 13 INPUT

6 INPUT

SELECT 2/
KEY OUT

7 INPUT

SELECT 4/
KEY OUT

output to PA, 1-12 Vdc

one of four select out­puts to PA multiplexers,

1

LO=2

one of four select out­puts to PA multiplexers,
not used

9 A/D2+ multiplex analog input

from PA No. 2 multi­plexer

10 A/D4+ mul tiplexed analog input

from PA No. 4 multi­plexer

11 PA FAUL T PA fault input, HI=fault

one of four se lect outp uts

SELECT 1

14 INPUT

SELECT 3

15 AUX LATCH

ENABLE

to PA multiplexers,
LO=2
mux input decoder

one of four se lect outp uts
to PA multiplexers,
LO=2
mux input decoder

latc h-en able out put to PA
multiplexers, LO=mux
input de cod er read s the
three select inputs

0

digit enabled for

2

digit enabled for

8 REF SAMPLE reflected power sample

inp u t fr om PA

4.4.5 Switches and Jumpers

Figure 3-2, DSP Exciter Top View with Internal Controls and Indicators, shows the

locations of user-adjustable switches and jumpers. Refer to Table 4-5 for a lis t of software
related jumper positions found on the exciter/control board. No switches are available to
maintenance personnel.

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 4-3

DSP Exciter Glenayre Document Number : 9110.00172
INSTALLATION AND SETUP Issue 1, Rev. I: 01/15/97

Table 4-5 Exciter Control Board Jumper Positions

Jumper pre version 2.10 software version 2.10 software

JW1 set to A for external 10 MHz oscillator set to A for external 10 MHz oscillator

set to B for intern a l 10 M H z osci ll ato r set to B for intern a l 10 MH z osci ll at or

JW2 set to A for password prot ect ion set to A for password protec tion

set to B to bypass password protection set to B to bypass password protection

JW3 set to A for external VSWR protection always set to B (for internal and/or ex-

set to B for internal VSWR protection

ternal VSW R protection)

4.5 Setup

Note

When doing a setup for a wideband DSP exciter, the net channel change
time must be set for 300 ms.

Refer to the DSP exciter VDT Men us and user manua l for transm it ter-co ntro l setup i nfor­mation. All setup is don e via the front-panel VT100 interface.

4.6 Ultimate Disposition

Caution

This equipment may contain hazardous materials.
Check with the local EPA or other environmental
authority before disposing of this equipment.

Page: 4-4 Copyright © 1997 Glenay re Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 INSTALLATION AND SETUP

v0164.hgl

sec_4

Figure 4-1 DSP E xciter/PA Control Circuit Boards

Interconnection Diagram

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 4-5

DSP Exciter Glenayre Document Number : 9110.00172
INSTALLATION AND SETUP Issue 1, Rev. I: 01/15/97

Page: 4-6 Copyright © 1997 Glenay re Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 OPERATION

5 OPERA TION

5.1 Front-Panel Controls and Indicators

Refer to Figure 5-1, Front-Panel Controls and Indicators, which shows and describes
front-panel indicators. The DSP exciter contains no front-panel controls. A front-panel
access to VCO adjustment is for maintenance purposes only.

5.2 Operating Instructions

sec_5

The transmitter controller operates the exciter and transmitter in an unattended manner
during normal system operation. The VT100 interface with a VDT enables the maintenance
technici an to perf o rm ma inten ance a nd observ e operational parame ters. R e fer to the DS P
exciter VDT Men us and user man ua l for detai led operat in g info rm ati on.

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 5-1

DSP Exciter Glenayre Document Number : 9110.00172
OPERATION Issue 1, Rev. I: 01/15/97

v0079.hgl

Figure 5-1 Front-Panel C ontrols and Indicators

Page: 5-2 Copyright © 1997 Glenay re Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 THEORY OF OPERATION

6 THEORY OF OPERATION

6.1 Exciter/PA Control

Refer to Figure 6-1, DSP Exciter RF Stage F unctional Diagram, which d escribes th e
signal flow in the DSP exciter with the transmitter controller interface. The following major
paragraphs describe the operation of the major items within the figure. Additional detailed
figures are referen ce d, as requ ire d.

6.1.1 Reference Source

sec_6

6.1.2 Main Circuit Frequencies

The ten-MHz reference signal is provided by the transmitter controller or by an optional
internal reference oscillator. All other inputs and outputs, except for RF output, are routed
thr ough the interface board.

The VCO/RF amplifier board installed determines the frequency for the RF output.

Table 6-1, Exciter RF/Main Circuit Freq uencies lists VCO/RF amplifier board frequen-

cies and the corresponding exciter/out put freque ncies.

Table 6-1 Exci ter RF/Main Circuit Frequencies

exciter
output
frequency
(MHz)

900-960 100 90 89.9 810-870
445-470 100 90 89.9 355-380
275-330 100 90 89.9 365-420
130-180 100 90 89.9 220-270

first IF
frequency
(kHz)

second IF
frequency
(MHz)

VCO-1
frequency
(MHz)

VCO-2
frequency
(MHz)

6.1.3 Controller Interface Connect or Functions

Refer to Table 4-2, DSP Exciter I/O Connectors and subsequent ta ble s fo r a pin-by-pin
description of signal functions. The exciter interfaces with the transmitter controller
through the exciter interface I/O board. Connector P4 on the internal interface board
connec ts d ire ct ly to J4 o n the exc it er. Alarm sig n a ls, con si st in g of tran s m itt er ala rm , fau l t,
and status signals, are suppl ied dire ct ly to the trans mitt er con troll er.

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 6-1

DSP Exciter Glenayre Document Number : 9110.00172
THEORY OF OPERATION Issue 1, Rev. I: 01/15/97

v0123.hgl

Figure 6-1 DSP Exciter RF Stage Functional Dia gram

Page: 6-2 Copyright © 1997 Glenay re Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 THEORY OF OPERATION

6.2 Interface to Controller

6.2.1 General

The controller interface is the portion of exciter circuitry that connects the transmitter
cont rolle r to t he exc ite r. Th e in terfac e bo ard di ctat es wha t kin d of t ransm itte r con trol ler
may operate the transmitter. The transmitter can be operated through one of several control­lers depending on which interface board is installed in the exciter. The internal interface
board may also exh ibi t an exte rna l I/O bo ard .

Control commands from the transmitter controller are connected through the interface
circuit. This circuit supplies remote control to the microcontroller unit (MCU) control

sec_6

6.2.2 Interface Conversion Functions

circuit. The VT-100 VDT supplies local control. The MCU control circuit generates all
control signals for the other circuits, and monitors their status. The MCU control circuit
reports status back to the VT-100 VDT and the interface circuit, whi ch supplies the status
to th e t r ansmitter co ntroller.

Some signals exchanged between the controller and the exciter originate with a format,
voltage, or requirement incompatible with their destination. The interface performs any
signal conversions necessary to provide compatibility between the controller and the
exciter. None, some, or all of the following conversion functions may be done by any one
particular int erf ace boa rd .

6.2.2.1 Analog-Mode A/D Conversion

The DSP modulator circuit reads synchroniz ed serial data for its analog mode input signal.
if the transm itter co ntro ll er prov i des an ana log signal , the co ntro ller i nterf a ce conve rts the
analog to the appropriate data form for the DSP. The analog (FLA T AUDIO+, -) terminates
across a balanced inp ut circuit that also provides a level adjustment. The adjustment, when
properly set by the AUDIO INPUT ADJUST pot through the exciter cover, provides analog
to an A/D co nverter at the opt im um zero-dBm l evel. The A/D con verts the analog i nto
serial da ta, wh ich is appl ied to the D SP t hroug h a sy nc hronous data link. A synchronous
data link is chara cterized by an exchange of pulse streams for timi ng purposes. Th e A/D
converter is clocked by a pulse generator circuit driven by the ten-MHz reference circuit.

6.2.2.2 FSK-Data-Bit Strapping

The DSP modulator circuit can read up to four bits for its digi tal FS K mode input signal . If
the controller provides onl y bit 1 (DATA 1), operation in the fo ur-level mode or h i gher i s
precluded. Bits 2 through 4 (DATA2 through DATA4) are available as FSK data inputs;
whether they are used or not is a function of the particular controller interface used and the
transmitter controller. Refer to Section 10. The controller interface disables unused bits by
ground straps.

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 6-3

DSP Exciter Glenayre Document Number : 9110.00172
THEORY OF OPERATION Issue 1, Rev. I: 01/15/97

6.2.2.3 Channel-Select-Bit Strapping

The MC U control circuit re ads three bits t o determine the remotely selected channel. If the
controller provides only bits 1 and 2 (CH SEL 1, 2), the controller can command only four
channels. The operation o f bit 3 i s a f unction o f the controller i nter face. Refer to Section 10.

6.2.2.4 Mode-Select-Bit Strapping

The MCU control circuit reads two bits to determine the remotely selected mode. If the
controller provides only bit 1 (MODE CONTR OL ), the control ler can com mand only two
transmitter mode s. The opera tio n of bit 2 is a functi on of the con trolle r interfac e. Refer t o
Section 10. If the control ler in terf ac e does not use bit 2, it straps it to ground (low).

6.2.2.5 Power Sample D/A Conversion

The controller reads sample voltages for its forward and reflected power sample inputs,
which are stored as data in the MCU control circuit. In some cases the controller interface
converts the data to voltages of the appropriate range for the controller. Data from the MCU
representing the forw a rd and ref l ecte d powers is wri tten i n to a du al D/A convert er, which
converts th e data into tw o proportional dc voltages, which are appli ed to the controller.
Control logic gates ensure that data is written to the proper half of the D/A converter.

6.3 DSP Modulator

6.3.1 General

6.3.2 DSP Modulator Signal Flow

The DSP modulator circuit converts the data into the first IF signal, which is fully modu­lated. The IF st age circuit c onverts the first IF signal into the second IF signal. The RF s tage
circuit c onverts the secon d IF signa l into the RF outpu t. Ten MHz is used as fre quency
reference by each co n v ersi o n st ag e. T h e D SP modu l ator is the po rtion of ex c it er ci rcuitry
between the controller interface and the IF stage. The DSP modulator uses digital signal
processing to mod ula te and up-co n vert t he pag ing inf orm a tio n into the firs t IF sign al. The
modulation type depends on the transmitter operating mode. The IF stage is the portion of
exciter c ircu itry betw een the D S P mod ulat or and t he RF st age. The IF stag e u ses h etero ­dyne mixi ng to gen erate th e optimu m seco nd IF sig nal frequ ency, which depen ds on the
requirement of the VCO/RF amplifier board installed. The MCU control circuit is the
comman d and co n t ro l h u b o f the transmit t e r. The type of co n t ro l so f tware d e pends o n th e
transmitter frequenc y and power output. The following text describes main exciter circuitry
that works for all software programs, modulation schemes, and IF signal frequencies.

Figure 6-2, DSP Exciter MCU Circuit Functional Diagram shows additional details.

Refer to Figure 6-2, DSP Exciter MCU Circuit Functional Diagram, in the followin g
discussion. The inputs that provide the paging information to the DSP modulator circuit are
digit iz ed au dio and FS K data, supp li ed b y the con trol ler inte rfac e circu it th ro ugh conn ect or
pair P1/J1. Digitized audio arrives as serial data. FSK data arrives as parallel data. The DSP
modulator circuit processes the digitized audio in the analog mode or the FSK data in the
digital mod e. The re sult of thi s processi ng is the excit er ’s first IF signal , which is applied

Page: 6-4 Copyright © 1997 Glenay re Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 THEORY OF OPERATION

to the IF stage circui t. To produce the fir st IF signa l, t he DSP modul ator co ntains two DSPs
(a signal modulator and a quadr ature modulator), a digital-to-analog converter, and a read­only memory. The following tex t descri bes the se four compo n ent s and their signa l flow.

6.3.2.1 Digital Signal Modulator

The signal modulator (SM) generates modulation that contains the paging information,
which is suppl ie d by digi tiz ed aud io or FSK d at a. The di g itiz ed au d io is inpu t into a serial
input port. An extern al edge detector i s required to inpu t the FS K data. Th e SM con verts
one of the data inputs into a modulated signal, which is mathematically represented within
the SM as a vector signal, defined by its rectangular coordinates. These coordinates,
commonly k nown as I and Q, are supplied to the digital quad rature modulator as 16-bit

sec_6

parallel data . The modula ted signal output from the SM depe nds on the fol lowing s ignal
characteristics:

• modulation scheme

• frequency response or rise time

• input logic or data inversion

• deviation level or bandwidth

• offset from carrie r frequ enc y

• analog gain and deviation limit

The SM also performs all communications between the DSP modulator circuit and the
MCU control ci rcu i t. Th es e c om mu nic ati ons are thro ugh t he SM 16-bit para llel d ata po rt.
External input and output latches expand the capabilities of this port. Control inputs consist
of commands such as reset, request status, set paging signal parameter, change mode, and
boot program . Requested status outputs co nsist of current mo de, deviation le vels, input
level, inpu t gain , modul ation d etected, and cu rrent po larity. Nonreque sted sta tus outpu ts
indicate the existence of analog limiting and modulation.

6.3.2.2 Digital Quadrature Modulator

The digital quadrature modulator (DQM) performs interpolation and up-conversion of the
modulated signal. The modulat ed signal input t o the DQM is applied by the SM as I and Q
components (16-bit parallel data). The DQM perfo rms tri gonometric comput ations at a
much hig her s amp l ing rate, whi ch determi n es th e first IF sig nal value a nd fre quency. The
modulated signal output from the DQM is supplied from its serial data po rt to the D/A
convert er.

6.3.2.3 Digital-to-Analog Converter

The digit al input to the dig it al- t o-analog (D/A) conve rter is the mo dul at ed si g na l fro m the
DQM. This data arrives as serial data. The analog output from the D/A converter is the first
IF signal. In ad dition to the IF stage circuit, the first IF s ign al is supplied to the M CU
control circuit, where it is rectified and filtered to generate fault logic.

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 6-5

DSP Exciter Glenayre Document Number : 9110.00172
THEORY OF OPERATION Issue 1, Rev. I: 01/15/97

v0083 .hgl7

Figure 6-2 DSP Exciter MCU Circuit Functional Diagram

Page: 6-6 Copyright © 1997 Glenay re Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 THEORY OF OPERATION

6.3.2.4 Read-Only Memory

A programmable and erasable re ad-only memor y (PEROM) stores t he modulator pr ograms
for both DSPs. These programs are transf erred to the SM when the exciter is booted up
(powered up), then the SM transfers the program to the DQM. The nonvolatile PEROM
retains its program for years. Its memory may be individually reprogrammed without
erasing the entire chip.

6.4 IF Stage

Refer to Figure 6-1, DSP Exciter RF Stage Functional Diagram. The input to the IF
stage is the first IF signal, which is supplie d by the DSP modulator circu it. The first IF

sec_6

signal carries all the paging information on an intermediate carrier frequenc y. The IF stage
perfo rms dire ct up-conv ersion of the fi rst IF si gnal to cre ate the second I F sign al, which
carries the same paging information as the first IF signal, but on a higher carrier frequency.
The second IF signal is applied to the RF stage through connector pair J10/P10. To produce
the second IF signal, the IF stage c ontain s mixer-1 and filter circuits. Supporting these
circuits are VCO-1 and synthesizer-1 circuits. Figure 6-2, DSP Exciter MCU Circuit

Functional Diagram, and Figure 6-3, DSP Exciter-to-Controller Functional
Diagram, show additional detail.

6.4.1 Mixer-1

Mixer-1 is t he first he terodyn e mixe r. Inputs to mixer -1 are a m odulated IF and a c arrier.
The modulate d IF inpu t is the first IF sign al. T he carrie r inpu t is suppli ed by VC O-1. The

6.4.2 Filte r

6.4.3 VCO-1

6.4.4 Synthesizer-1

output from mixer-1 consists of two modulated carriers that are sums and difference
frequencies of the inputs. These two frequencies are applied to the filter circuit.

The filter is c enter ed at the second IF s ignal f requ ency with a 45-kHz bandwidth . The input
to the filter consists of two modulated carriers. These are sum and difference frequencies
supplied by mixer-1. The output from the filter is only the sum frequency. This modulated
output is the second IF signal.

VCO-1 is the local oscillator for the IF stage. The input to VCO-1 is a dc control voltage.
This voltage controls VCO-1 carrier frequency and is supplied by synthesizer-1. The output
from VCO-1 is a sine-wave carrier. The output is applied to mixer-1.

Synthesizer-1 control s VCO-1 carri er frequ ency by m eans of a pha se-locke d loop (PLL ).
PLL input s are a carrier a nd a phase reference . The referen ce input is a ten-MH z carrier
supplied by the ten-MHz reference circuit. The carrier input is from VCO-1. The PLL
output is a dc control voltage. This voltage, set to cause the VCO-1 carrie r to lock phases
with the reference, is supplied to VCO-1.

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 6-7

DSP Exciter Glenayre Document Number : 9110.00172
THEORY OF OPERATION Issue 1, Rev. I: 01/15/97

Synthesizer-1 also performs all communications between the IF stage circuit and the MCU
control circuit. A control input specifies the VCO-1 carrier frequency; this data is received
over a serial data link when the exciter is booting or changing channels. Status outputs are
a lock fault and a VCO1 level . The lock fault indicates loss of the carrier/ refere nce phase
lock. The VCO1 level is the VCO-1 control voltage.

6.5 MCU

Refer to Figure 6-4, DSP Exciter Detailed Functional Diagram . Control output s are
supp li e d by the MCU control ci r cuit to the othe r f unctional ci r cuits. Likewis e, s tatus inputs
are applie d to the MC U contro l circuit from the o ther func tional circu its. Di scussions o f
these control and status signals are included with the information on the other major func­tional circuits. To interface these control and status signals, the MCU control circuit
contains an MCU, D/A converter, 8/16 bit converter, read-only memory, and a VSWR-fault
detector. To light the front -panel LEDs, the MCU control circu it co ntains a ban k of P NP
switching tr ansistors.

Refer to Figure 6-2, DSP Exciter MCU Circuit Functional Diagram, in the followin g
text which describes this circuitry and its signal flow.

6.5.1 Microcontroller Unit (MCU)

The MCU contains a central processing unit (CPU), memories, peripherals, and other
hardware on a single chip. The primary internal functions of the MCU and their application
in the exciter are describe d in the follow ing lis t.

• An eight-bit remote input port accepts discrete low power mode, emission mode, keyline,

and channel selects from the controller interface circuit. An external edge detector is
required to input the channel selects.

• Interrupt logic stops RF transmission when a fault or reset input is received, e.g. a VSWR

or PA fault.

• An on-board oscillator/clock generator, driven by an external crystal, times internal

MCU functions. A synchronized clock output times external functions.

• The MCU perf orm s most in terfacin g throug h a paralle l commun ication s link: eig ht-bit

data bus, sixteen-bit address bus, and a read/write line. External input and output latches
expand the capability of this link.

• An eight-bit input/output port supplies discrete keyline, RF status, and chip select

co ntro l s to th e ex cit e r and th e PA.

• A seri al periphe ral i nterfa ce (SPI ) suppli es sy nchro nous s eri al frequ ency da ta to the IF

sta ge an d RF st ag e cir cu i ts . In dividual c omm ands loa d the p r ogr a m i nto either I F s tage’s
s ynthesizer-1 or RF stage synthesizer -2.

• An 8-inpu t analog-to -digital (A/D) con verter meas ures volt age input s from the e xciter

and the PA. An external multiplexer expands MCU analog inputs to fifteen.

• A serial communicati ons interface (SCI) exchang es asynchro nous serial RS -232 data

with the VT-100 VDT. An external RS-232 driver buffers the MCU data, allowing it to
be exchanged through external connector J3.

• A random-access memory (RAM) temporarily stores transmitter fault and alarm values.

Page: 6-8 Copyright © 1997 Glenay re Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 THEORY OF OPERATION

• An elec trically-erasabl e read-only me mory (EEPROM ) permanently stores transm itter

signal parameters.

6.5.2 Digital-to-Analog (D/A) Converter

A D/A converter generates an AGC reference voltage. The D/A converter inputs are data
and select logi c. T he d a ta, sup plied by the MCU w hen t he D/A is selected , represe nts the
desired transmitter power output. The D/A converter output is an AGC reference voltage.
This voltage represents a le vel proportion al to the d esired tra nsmitter power outpu t. The
AGC reference voltage, output through connector J6, is used by the P A to generate an AGC
voltage.

sec_6

6.5.3 8/16-Bit Converter

An 8/16-bit converter allows the MCU eight-bit data bus to communicate with the 16-bit
data bu s o f t he D SP mo dul ator circu i t. T he MCU mu st p erfo rm tw o rea d o r wr ite pro ce ­dures, a low byte and a high byte, to each one of the DSP modulator circuit. The converter
provides two status outputs to the MCU and the DSP modulator circuit. A data -available ­to-MCU status indicates that the DS P modulator circuit has written data into the converter
that the MCU must read. A data-available-to-DSP status indicates that the MCU has written
data into the converter that the DSP modulator circuit m ust read. In the event that the DSP
modulator circuit does not read data that the MCU has written, a DSP communications fault
is ge nerated.

6.5.4 Read-Only Memory

A programmable and erasable read-only memory (PEROM) stores the control program for
the transmitter. This program is transferred to the MCU when the exciter is booted up. The
nonvolatile PEROM re tains its prog ram fo r years. Its m em ory ma y be i ndivi dually repro­grammed without erasing the entire chip.

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 6-9

DSP Exciter Glenayre Document Number : 9110.00172
THEORY OF OPERATION Issue 1, Rev. I: 01/15/97

v0345l7

Figure 6-3 DSP Exciter-to-Controller Functional Diagram

Page: 6-10 Copyright © 1997 Glenayre Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 THEORY OF OPERATION

v0345R.hgl

sec_6

Figure 6-3 DSP Exciter-to-Controller Functional Diagram

(Continued)

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 6-11

DSP Exciter Glenayre Document Number : 9110.00172
THEORY OF OPERATION Issue 1, Rev. I: 01/15/97

v0081 .hgll

Figure 6-4 DSP Exciter Detailed Functional Diagram

Page: 6-12 Copyright © 1997 Glenayre Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 THEORY OF OPERATION

v0077.hglr

sec_6

Figure 6-5 DSP Exciter IF-Stage Detailed

Functional Diagram

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 6-13

DSP Exciter Glenayre Document Number : 9110.00172
THEORY OF OPERATION Issue 1, Rev. I: 01/15/97

6.5.5 VSWR-Fault Detector

The excite r receives a VSWR sign al from the PA throu gh connector J7. Thi s signal is a
rectified dc voltage sample generated by the isolator. The voltage sample is monitored by
the MCU to provi de the valu e for the tota l refle cted -power indic at ion. Th e voltag e sam ple
is also monitored by a fault circuit in the e xciter. If a factory-preset voltage is e xceeded, t he
fault circuit shuts down the transmitter by an interrupt to the MCU.

6.5.6 Alarm Data-to-Logic Conversion

The transmitter controller reads logic alarm inputs; most of these alarms are stored as data
in t h e MCU con t r ol ci r c uit . I f the co n t r o lle r interface c o nve rt s th e data t o individua l l ogic
signals for the controller, data from MCU control representing the alarms is clocked into a
pair of l at ches. The la tc hes con vert t he data into c ont inuo us l ogic si gnals. T hese s i gnals and
others control a bank of NPN switching transistors that supply the actual logic signal to the
controller. Control logic gates convert chip controls from the MCU into a clock input for
the la tches.

6.6 RF Assemblies

6.6.1 RF Stage Location

Refer to Figure 3-3, DSP Exciter Simplified Functional Diagram, to locate the
assembl y. The RF stage circu its are loca ted on tw o circui t board s, both housed within the
exciter chassis.The exciter/control board is the main circuit board and the VCO/RF
amplifier board is a selected option. The exciter/control board connects to the VCO/RF
amplifier boa rd through three c onnector pairs: J4/P4, J9/P9, and J10/ P10. The VCO/R F
amplifier board also contains BNC connector J3, which extends through the rear panel of
the exciter. This board contains most of the RF stage components inside an RF shield. A
hole in the shiel d and t he f ront pa nel prov id e acces s to a n RF stage adjust ment, which is
marked VCO ADJ on the front panel.

6.6.2 RF Assemblies

6.6.2.1 RF Stage Description

The RF stage is the portion of exciter circuitry between the IF stage and RF out and is the
final major functional circuit, the RF stage determines the transmitter RF output frequency,
and dictate s the hi ghest and low est pos sibl e RF ou tput f requenc ies (R F ban d). T he tran s­mitter ca n be op era ted at s ever al RF ban ds, de pen ding on the RF s tag e c irc uit ry installed in
the exciter.

6.6.2.2 RF Stage Bands

The sel e ct ed VCO /RF ampli fier boa r d det er mi ne s th e R F band of t he tr a ns mi tt er. Table 3-

1, Part Numbers of VCO/RF Amplifier Boards, lists the RF bands and the part number

of the board with that RF band.

Page: 6-14 Copyright © 1997 Glenayre Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 THEORY OF OPERATION

6.6.2.3 RF Stage Signal Flo w

Refer to Figure 6-1, DSP Exciter RF Stage F unctional Diagram. The input to the RF
stage is the second IF signal, supplied by the IF stage circuit through connector pair J10/
P10. The secon d IF signal carries t he paging informatio n on a modulated c arrier at the
exciter’s second intermediate frequency. The RF stage converts the second IF signal into
the exciter ’s RF output. Th is RF outpu t ca rrie s the same pag i ng inform a tio n as the second
IF signal, but on a modul ate d carrier of radio frequency. The RF output is normally applied
to the PA thro ugh c onn e ctor J3. To produce th e RF output , t he R F stag e con tai ns mi xer - 2,
a filter, and an amplifier. Support ing t hese circu its are VC O-2 and synth-2. T he fo llowing
text describes these five circuits and their signal flow.

sec_6

6.6.2.3.1 Mixer-2

Mixer-2 is t he seco nd he ter odyne m ixer. Inputs to mi xer-2 a re a modula te d IF and a carrier.
The modulated IF is the second IF signal. The carrier is supplied by VC O - 2. Ou tput from
mixer-2 consi sts of sum and difference frequencies of the inpu ts. The sum frequency is
centered n ear th e cha nnel c arrier, and t he di fferenc e fre quency abou t twice the secon d IF
frequency below that. These two modulated RF carriers are applied to the filter circuit .

6.6.2.3.2 Fi lter

The filter is factory-se l ecte d and tuned , with a bandwi dth determ ine d by carri er freque nc y
of the transm itte r. The inputs to th e filte r consi st of t wo mod ulated R F carri ers a nd a key
control.The two carriers are sum and difference frequencies, supplied by mixer-2. The key
contro l is suppl ied by the MCU contro l circui t through J4/ P4. The output from the filter,
supplied when t h e ke y con trol is rec eiv ed, i s on l y the su m frequency. This modulated RF,
centered near the chann e l on-frequ enc y, is supplied to the amplifier.

6.6.2.3. 3 Amplifier

The amp l ifie r p r ovi d e s amp l ifi cati o n t o the value li s ted in t he sp eci fi cat ions as ex cite r R F
power out. The inputs to the amplifier consist of modulated RF and a key control. The
modulated RF, mixer-2 sum output frequency, is supplied through the filter. Key control is
supplied by the MCU c ontrol circuit through J4/P4. Outpu t from the amplifier, supplied
when the key control is received, is an amplified version of the modulated RF. This
amplified output is the exciter RF output.

6.6.2.3.4 VCO-2

VCO-2 is the RF sta ge local oscillator. Inputs to VCO-2 are a dc control voltag e and an
adjustment. Dc control voltage is supplied by synthesizer-2. The adjustment, which varies
the VCO2 control volta ge level, is controlled through the front-panel VCO ADJ access.
This control provides the means for VCO-2 to output a carrier frequency that would
otherwise be beyond the range of the control volta ge input. The carrier out put, always
second IF freque ncy belo w the chan ne l carrier fre que n cy, is applied to mixer-2.

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 6-15

DSP Exciter Glenayre Document Number : 9110.00172
THEORY OF OPERATION Issue 1, Rev. I: 01/15/97

6.6.2.3.5 Synthesizer-2

Synthesizer-2 control s VCO-2 carri er frequ ency by m eans of a pha se-locke d loop (PLL ).
PLL inputs to synthesizer-2 are a carrier and a phase reference. The reference is a ten-MHz
carrier supplied by the ten-MHz reference circuit. The carrier is the VCO-2 output. The
PLL output from synthesizer-2 is a dc control voltage. This voltage, set to cause VCO-2 to
lock phases with the reference , is applied to the VCO-2 control inpu t.

Synthesizer-2 also performs all communications between the RF stage circuit and the MCU
control circuit. A control input to synthesizer-2 specifies VCO-2 carrier frequency. This
data is received over a serial data link when the exciter is booting or changing channels.
Status outputs from synthesizer-2 are a lock fault and a VCO2 level. The lock fault
indicates loss of the carrier/reference phase lock. VCO2 level is the VCO-2 control voltage.

6.7 Voltage Regulator Circuit

Refer to Figure 6-4, DSP Exciter Detailed Functional Diagram (center, toward bot tom)
in the following discussion. The exciter receives 26-volt operating power through terminal
board TB1 . The dc power indica tor on the e xcite r front pan el is con nec ted to this i nput. T his
voltage is supplied to a 26-volt bus and is monitored by the MCU. An intermediate
regulator reduces the 26 volts to 16.5 volts, which is sup plied to the two final regulators.
One regulator genera tes 13.5 volts, whi ch is suppli ed to a 13.5-v olt bus and moni tored by
the MCU. The other regulator generates 5 volts, which is supplied to a five-volt bus and
monitored by the MCU.

Page: 6-16 Copyright © 1997 Glenayre Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 MAINTENANCE

7 MAINTENANCE

7.1 Location of Maintenance Procedures

The DS P excite r is central to perfo rming tran smitte r mainte nance. Mo st maint enance o f
electrical assemblies is done via the VT100 interface. Any maintenance procedures whic h
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 interf ace.

sec_7

7.2 Test Equipment Required

Table 4-1, Test Equipment Required, lists test equipm ent 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. I f the transmitter is to operate at more than one
frequ en cy, perform t h e multichann el adjustmen t proced u re. If th e transmitter is to o pera te
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

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

2. Selec t tran smi tte r cha nne l o f lowe st frequen c y if not alre ad y selec te d.

3. Use tuni ng tool sup plied 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 ), o n VCO2
sta tus display.

4. R et urn transmit t er t o service.

Proc edure is complete.

7.3.2 VCO-2 Single-Channel Adjustment Procedure

This proced ure does not apply to wideband option.

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

2. Select transmitter channel of operating frequency if not already selected.

3. Use tuni ng tool sup plied to adjust VCO ADJ control through exciter front panel. Ad-

just for readi ng of 5.0 Vdc on VCO2 status display.

4. R et urn transmit t er t o service.

Proc edure is complete.

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 7-1

DSP Exciter Glenayre Document Number : 9110.00172
MAINTENANCE Issue 1, Rev. I: 01/15/97

7.4 Over-The-Link Downloading

Over-the-link (OTL) code downloading allows C2000 transmitter controller (C2000)
software, alarm matrix setup, and exciter software to be downloaded over the C2000 link
cha nnel.

To properly use OTL downloading, C2000 units must be programmed for the correct
control group, site ID, and unit ID, which are integra l to C2000 hard ware and software.
When information is downloaded over the link channel, the control group, site IDs and/or
unit IDs that are to receive the code must be spec ified.

Caution

If the control group, site ID, and unit ID are not
specified, all units in the system accept the
download information. In a mixed system, this can
result in some of the transmitters being off the air.
An example of this would be a GL-T8600 exciter
receiving a GL-T8500 exciter programming code.
The GL-T8600 exciter would not operate with this
software and could resul t in a site visit to correct
the problem.

Programming of control groups and site IDs is done via the C2000 front port with a local
conne ct ion or thr oug h a mo dem fr om a r emote loc at ion . The co ntr ol g roup s sho ul d be set up
as a group of transmitters having the same configuration. For example, all GL-T8500 trans­mitters could be in one control group and GL-T8600 transmitters be in another. This would
allow one to download exciter software to all GL-T8500 transmitters at one time by
select ing the ir con trol group. Any transm itter with a differen t control gro up would not
acce pt th e d ownlo ad in f o rm at ion.

Site ID must be different for each site location, and is used when downloading information
to a specific site location. If there are multiple units at the same site, the site ID and unit ID
need to be specifi ed to d ow n load t o a spec ifi c un it. If the uni t ID i s not spec ified , all unit s
at that site accept the downlo ad .

Unit ID is prog rammed with a rota ry switch in the C2 000; it must be differe nt for each
C2000 at a site location. To download one specific unit, bo th site and unit ID must be
specified for that unit; the unit with that site ID and unit ID is the only one that accepts the
download.

For assistance on how to perform a download, call Glenayre customer support at 800-637-

9181.

7.5 On-The-Fly Channel/Mode Changing

Different paging formats may require different digital deviation and offsets of paging data
on the same RF carrier frequency. In the past, the only way to meet the different deviation
requirement s on the same frequency was to program two different channels for the same
RF carrier frequency and then program those same two channels for a differen t digital

Page: 7-2 Copyright © 1997 Glenay re Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 MAINTENANCE

deviation and offset. By changing channels, the deviation requirements of the paging
formats were m et. How ever, a channe l change requi res that the transmi tter be unke yed to
allow ti m e for PLL lo ck-up, w hic h is a los s of ai r ti m e.

The on-the-fly feature allows the f ollowing:

• Each channel can be programmed for four different digital modes (A, B, C, D)

• Each mode allows different digital deviation and offsets to be programmed

During normal paging operation, the C-2000 controller sends information to the transmitter
telling it what channel to operate on and which one of the four digital modes to use. The
four different digital modes of operation are controlled by the data 2 and data 3 lines into
the C-2000 interface board o n the DSP exciter. If the paging data requires a different devi-

sec_7

7.5.1 Programming Example

ation, the C-2000 transmit ter c ontroller can change the mode without ha vin g to ch ange the
channel. This allows the DSP exciter to accommodate different paging format requirements
without unkeying the transmitter to change channels.

To set up the exciter for the proper digital deviat ion and offset programming, ma ke up a
table similar to the one shown below. Next, access Digital Mode Setup menu and select
View Channel Frequencies submenu.

Table 7-1 Deviation and Offset Programmin g

1&9 2&10 3&11 4&12 5&13 6& 14 7&15 8&16
Mode/Dev.A 4500 4500 4500 4500 4500 4500 4500 4500
Mode/Offs et A 0 +400 -400 [phone]
Mode/Dev.B 4800 4800 4800 4800 4800 4800 4800 4800
Mode/Offset B 0 +200 -200 +400 0 +400 -400 0
Mode/Dev.C 2400 4200 4200 2400 2400 4200 2400 4200
Mode/Offset C00 00000 0
Mode/Dev.D 4200 2400 4200 2400 2400 2400 4200 2400
Mode/Offset D 0 0 [phone]

Initial release has setu p simila r to abo ve table . Subsequ ent releas es ma y
have more programming variations

Channel

Note

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 7-3

DSP Exciter Glenayre Document Number : 9110.00172
MAINTENANCE Issue 1, Rev. I: 01/15/97

Note

When on-the-fly software is used with a QT-1000 interface board
install ed in the exciter, only the deviation and offse t program ming f or
mode D is ava ilabl e. Re ferences in t he exc iter menu s pert aining t o modes
A, B, and C are blanked out.

7.5.1.1 Release 2.10 DSP Exciter

The C-2000 transmitter controller detects a FLEX baud rate of 1600. When this condition
is detec ted, the mode c ontrol l ines to the DSP excit er chan ge it t o mode B. I f the FLEX baud
rate is not detected, the mode con trol lines are set for mod e A. This requires that mod e A
deviation (and offset) be set for POCSAG (512, 1200 or 2400 baud), Golay, NEC and any
other paging f orm a t ot her t han FL EX requiremen t s. Mo de B d e viat ion a n d offset m us t be
set for FLEX. Mode C and D are not used.

7.6 16-Channel Operation

With 16-channel capability, the on-the-f ly digital mode progra mming is only progra m­mable on 8 channels. When channels 1 through 8 are prog rammed for different modes,
channels 9 throu gh 16 follow the same mo de progra mming respec tively (i.e. channel 9 is
the same as 1, channel 10 is the same as 2, etc.). Selecting additional channels (9 through

16) is achieved by the C-2000 controller pulling mode-1 line low to the C-2000 interface
board.

Page: 7-4 Copyright © 1997 Glenay re Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 MAINTENANCE

7.7 On-The-Fly Interface

sec_7

Figure 7-1 On-The-Fly C2000 Control Lines to DSP Exciter

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 7-5

DSP Exciter Glenayre Document Number : 9110.00172
MAINTENANCE Issue 1, Rev. I: 01/15/97

Notes:

A C-2000 interface boa rd in the DSP exciter mu st be used with on-the-f l y software

All J1 pin connecti ons shown on the above dia gra m are at the inp ut to the C-2000 int er face
board in the DSP exciter

Data 0 at the input of the C-2000 interface board controls Data 1 at its output
Data 1 at the input of the C-2000 interface board controls Data 2 at its output
Data 2 at the input of the C-2000 interface board controls Data 3 at its output
Data 3 at the input of the C-2000 interface board controls Data 4 at its output

Mode 0 at the input of the C-2000 interface board controls Mode sel 1 at its output
Mode 1 at the input of the C-2000 interface board controls Mode sel 2 at its output

Freq 0 at the inpu t of the C-2000 interface board controls Ch select 1 at its output
Freq 1 at the inpu t of the C-2000 interface board controls Ch select 2 at its output
Freq 2 at the inpu t of the C-2000 interface board controls Ch select 3 at its output

Page: 7-6 Copyright © 1997 Glenay re Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 CHECKOUT AND TROUBLESHOOTING

8 CHECKOUT AND TROUBLESHOOTING

8.1 CHECKOUT

The DSP exciter has two functions; it produces on-frequency RF and has a microprocessor
to handl e inp ut fr om the PA and transmitter c ontroll er. Checkou t i nvol ves ver i fying t hat RF
is produced and unkeying occurs during a fault condition.

8.2 TROUBLESHOOT ING

sec_8

The recommended troubleshooting level for the exciter is at the unit level. That is, if the
exciter fa il s to pr ovi de the t r ans mitter system with a usab le, modul at ed RF- dri ve si gnal a nd
all the ex citer’ s p o wer , cont r ol, a nd s ig nal inp uts a r e normal, you should repl ace t he exc it er
with a spare.

Print Date: 02/18/97 Copyright © 1997 Glenayre Page: 8-1

DSP Exciter Glenayre Document Number : 9110.00172
CHECKOUT AND TROUBLESHOOTING Issue 1, Rev. I: 01/15/97

Page: 8-2 Copyright © 1997 Glenay re Print Date: 02/18/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 REMOVAL AND REINSTALLATION

9 REMOVAL AND REINSTALLATION

Remove all input power fro m tra nsm itt er cabin et bef ore perform in g these procedu res .

9.1 Excite r/PA Control Chassis

Refer to Figure 9-1, DSP Exciter Chassis Removal and Reinstallation, for a detailed
drawing.

Note

sec_9

9.1.1 Removal Procedure

Memory PROMs in the replacement exciter should be the same as in the
original exciter unless the maintenance technician intends to modify
exciter characteristics. Also, parameters, s uch as channel frequenci es,
may be stored in nonvolatile RAM. Ensure that the replacement exciter
is programmed correctly.

1. Support exciter while removing the four screws from the front panel that secure it to

the cabinet. Save screws for installation procedure.

2. Rem ov e exciter f rom cabin e t far eno ugh to acc ess back pane l.

3. Disconnect connector J3 from connector P3 that is pigtailed off terminal board TB1

9.1.2 Reinstallation Procedure

(dc power input).

4. If a cont r o lle r i n terface I/ O p anel is mo unted on exciter b a ck p a nel, remo ve I/O pa nel ;

leave all wires conn ecte d to I/O panel .

5. Tag all connectors attached to the exciter back panel.

6. Remove all connectors attached to the exciter back panel. Leave P3 connector/wiring

assembly connected to terminal board TB1 for now.

7. Remove exciter.

8. Tag wires connected to terminal board TB1 on P3 connector/wiring assembly.

9. Disconnect tagged wires from terminal board TB1. Save P3 connector/wiring assem-

bly for installation procedure.

Proc edure is complete.

Note

A wideband DSP exciter that is installed in a GL-T8500 or GL-T8600
transmitter must h ave one rac k unit o f space bet ween it and the power
amplifier chassis.

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 9-1

DSP Exciter Glenayre Document Number : 9110.00172
REMOVAL AND REINSTALLATI ON Issue 1, Rev. I: 01/15/97

1. Before installing exciter, connect wires on P3 connector/wiring assembly to terminal

board TB1 on exciter back panel. P3 connector/wiring assembly is saved from remov­al procedure.

2. Connect connectors on transmitter to exciter back panel.

3. If controller requires interface I/O panel, install external interface I/O board on exciter

back panel (see Paragraph 9.4).

4. Connect connector J3 to connector P3 that is pigtailed off of terminal board TB1.

5. Locate connector P3 that is pigtailed off of terminal board TB1. Disconnect connector

P3 from connector J3.

6. Slide exciter into cabinet and secure with four screws saved from removal procedure.

Proce dure is complete . Perform set up, adju st me nt , or cal ibration proc ed u res as requ ire d.

9.2 Exciter Cover

These procedures must be performed with the exciter removed from the transmitter cabinet.
Refer to Figure 9-2, DSP Exciter Cover Removal and Reinstallation throughout these
procedures.

9.2.1 Removal Procedure

1. Remove two sem screws from sides of exciter cover. Save sem screws for installation

procedure.

2. Raise front of cover and extract back of cover from channel in back panel extrusion.

3. Remove exciter cover.

Proc edure is complete.

9.2.2 Reinstallation Procedure

1. Insert exciter cover into channel on exciter back panel extrusion.

2. Low e r cover so that finge rsto c k is behi n d exc iter fro nt pan e l.

3. While pressing down slightly on exciter cover: install two sem screws saved from re-

moval procedure through sides of exciter cover.

Proc edure is complete.

Page: 9-2 Copyright © 1997 Glenay re Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 REMOVAL AND REINSTALLATION

v0151.hgl

sec_9

Figure 9-1 DSP Exciter Chassi s Rem oval

and Reinstallation

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 9-3

DSP Exciter Glenayre Document Number : 9110.00172
REMOVAL AND REINSTALLATI ON Issue 1, Rev. I: 01/15/97

v0171.hgl

Figure 9-2 DSP Exciter Cover Removal

and Reinstallation

Page: 9-4 Copyright © 1997 Glenay re Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter

Note

Issue 1, Rev. I: 01/15/97 REMOVAL AND REINSTALLATION

9.3 Exciter/Control Board

These procedures must be performed with the exciter removed from the transmitter cabinet,
and the exciter cover removed. Refer to Figure 9-3, DSP Exciter Control Board

Removal and Reinstallation, throughout these procedu res .

9.3.1 Removal Procedure

Note

Save all hardware for installation procedure.

sec_9

9.3.2 Reinstallation Procedure

1. Remove controller interface board (see Table Paragraph 9.4 ).

2. Remo ve VCO/RF am plif ier board (see Ta ble Parag raph 9.5 ).

3. Remov e three kep nuts and three screws from regulators U1, U2, and U58.

4. Remove shoulder washer from regulator U58.

5. Remo ve two jam nuts and two lock washers from connec t ors J7 and J8.

6. Remove two jack socket screws attached to connector J6 through back panel.

7. Remove four sem screws from back panel and remove back panel from exciter chas-

sis. Some excit ers use th ree sem scre ws an d one stan doff .

8. Remove insulator between back panel and regulator U58.

9. Remove two jack socket screws attached to connector J3 through front panel.

10.Remove two studded standoffs through exciter/control board.

11.Remove nine sem screws that attach exciter/control board to exciter chassis, and re-

move exciter/control board.

Proc edure is complete.

Use hardware saved from inst a llat ion proce du re.

1. Position exciter/control board onto exciter chassis and secure with nine sem screws.

2. Install two studded standoffs through ex citer/control board.

3. Ap ply Vibra Tite or similar non perma nen t self-loc king liquid adhes ive to threads of

the two jack socket screws to be used for conne cto r J3. Apply only to to p 1 /4 inch of
thread on each jack socket scre w.

4. Ins ta ll two jac k sock e t scre ws in to co n n ec tor J 3 thro u gh fron t panel.

5. Apply thermal compound as follows: between regulator U1 and back panel, between

regulator U2 and back panel, between regulator U58 and insulato r, and between insu­lator and back panel.

6. Install in sulator between regulator U58 and back panel.

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 9-5

DSP Exciter Glenayre Document Number : 9110.00172
REMOVAL AND REINSTALLATI ON Issue 1, Rev. I: 01/15/97

7. Posit i on back pan el on exci ter chassi s an d secu re with four sem scre ws. So me excit-

ers use three sem screw s and one stan doff in the bottom right corne r.

8. Ap ply Vibra Ti te or similar non perm an ent self-lo c king liquid adhes ive to threads of

the two jack socket screws to be used for conne cto r J6. Apply only to top 1/4 inch of
thread on each jack socket scre w.

9. Ins tall two jack socke t scre ws in to con n ec tor J 6 thro ugh back panel.

10.Install two lock washers and two jam nuts over connectors J7 and J8.

11.Install shoulder washer into regulator U58.

12.Install three kep nuts and three screws through regulators U1, U2, and U58.

13.Install VCO/RF amplifier board (see Table Paragraph 9.5 ).

14.Install controller interf ace boa rd (see Tabl e Para graph 9.4 ).

Procedure is complete. After exciter is installed in transmitter cabinet: perform setup
procedu re if necessary (refer to the syst em an d men u manu al s).

Page: 9-6 Copyright © 1997 Glenay re Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 REMOVAL AND REINSTALLATION

v0170.hgl

sec_9

Figure 9-3 DSP Exciter Control Board R emoval and Reinstallation

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 9-7

DSP Exciter Glenayre Document Number : 9110.00172
REMOVAL AND REINSTALLATI ON Issue 1, Rev. I: 01/15/97

9.4 Interface Board

These procedures must be performed with the exciter removed from the transmitter cabinet
(see Paragraph 9.1), and the exciter cover removed (see Paragraph 9.2). Refer to

Figure 9-4, DSP Exciter External Interface I/O Board Removal and Reinstallation,

throughout the following procedures.

9.4.1 Removal Procedure

1. Remove jack socket screws (2 or 6) securing connector J4 (J1 and J2 not always used)

to the rear panel of the exciter. Save jack socket screws for installation procedure.

2. R emo ve two se m screws secu ri ng int erf ace board to sta n d offs. Save sem screw s for

installation procedure.

3. Grasp interf ace boa rd at the center of connector P1. Pull up on board with a firm ver-

tical motion to disengage connector P1 from connector J1 on the exciter/control
board.

4. Remove inter face board.

Proc edure is complete.

9.4.2 Reinstallation Procedure

1. Position interface board into place by inserting connector J4 (and J1 and J2 if used)

through openings in exciter rear pa nel.

2. Carefully align connector P1 on interface board with connector J1 on exciter/control

board and engage.

3. Sec ure in terf ac e boa rd to stan d offs wit h two sem scre ws sav ed from removal proc e-

dure.

4. Ap ply Vibra Ti te or similar non perm an ent self-lo c king liquid adhes ive to threads of

the six jack socket screws saved from rem oval proc edure. Apply only to top 1/4 inch
of thread on each jack socket screw.

5. Screw the six jack socket screws through holes on exciter rear panel at either sides of

connectors J1, J4, and J2.

Proce dure is co mplete. A fter exci ter is inst alled in to transmit ter cabine t, perfo rm audio
input adjustm ent procedu re (see Secti on 7).

9.5 VCO/RF Amplifier Board

These procedures must be performed with the exciter removed from the transmitter cabinet
(see Paragraph 9.1), and the exciter cover removed (see Paragraph 9.2). Refer to

Figure 9-5, DSP Exciter Interface Board Removal and Reinstallation, throughout

these proced ures.

Page: 9-8 Copyright © 1997 Glenay re Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 REMOVAL AND REINSTALLATION

9.5.1 Removal Procedure

1. Remove jam nut and lock washer from connector J3 on rear of exciter. Save jam nut

and lock washer for installation procedure.

2. Remo ve five sem scre w s securi ng VC O/R F ampl ifier boa rd to stand offs on exciter.

Save sem screws for installation procedure.

3. Grasp VCO /RF amplifier boa rd near connector P4. Pull up on board with a short ver-

tical motion to disengage connectors P4/P9/P10 from connectors J4/J9/J10 on exciter/
control board.

4. Remove VCO/RF amplifier board.

Proc edure is complete.

sec_9

9.5.2 Reinstallation Procedure

1. Before installing VCO/RF amplifier board, verify that RF band includes desired

transmitter operating frequencies (refer to Section 10).

2. Position VCO/RF a mpli fier boar d i nto p lace by inserting connec tor J3 throu gh hol e i n

rear of exciter.

3. Carefully align connectors P4/P9/P10 on VCO/RF amplifier board with connectors

J4/J9/J10 on exciter/c ontro l board and engag e.

4. Secure VCO/RF amplifier board to standoffs on exciter using five sem screws saved

from removal procedure.

5. Install lockwasher and jam nut to connector J3 on rear of exciter using lockwasher

and jam nut saved f rom removal procedure.

Proce dure is com plete . After exci ter is ins talled int o transm itter cabin et, perf orm VCO 2
adjustment procedure in Section 7.

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 9-9

DSP Exciter Glenayre Document Number : 9110.00172
REMOVAL AND REINSTALLATI ON Issue 1, Rev. I: 01/15/97

v0341.hgl

Figure 9-4 DSP Exciter External Interface I/O Board

Removal and Reinstallation

Page: 9-10 Copyright © 1997 Glenayre Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 REMOVAL AND REINSTALLATION

v0342.hgl

sec_9

Figure 9-5 DSP Exciter Interface Board Removal and Reinst allatio n

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 9-11

DSP Exciter Glenayre Document Number : 9110.00172
REMOVAL AND REINSTALLATI ON Issue 1, Rev. I: 01/15/97

Page: 9-12 Copyright © 1997 Glenayre Print Date: 02/19/97

dspsec10

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 OPTIONS

10 OPTIONS

10.1 Exciter/PA Control with QT-1000 Interface

The controller interface is the portion of exciter circuitry that connects the transmitter
controll er to the exc iter . The cont roller inter face dictate s what kind of trans mitter controll er
may operate the transmitter. The transmitter can be operated through one of several control­lers depending on the interface circuitry installed with the exciter.

Two boards form this interface, the internal QT-1000 interface board and the external
int erface I /O b oard.

Control commands from the transmitter controller are connected through the interface
circuit. This circuit supplies remote control to the microcontroller unit (MCU) control
circuit. The VT-100 VDT supplies local control. The MCU control circuit generates all
control signals for the other circuits, and monitors their status. The MCU control circuit
reports status back to the VT-100 VDT and the interface circuit, whi ch supplies the status
to th e t r ansmitter co ntroller.

10.1.1 Reference Source

The ten-MHz reference signal is provided by the controller via J8 on the exciter/control
board.

10.1.2 Controller Interface Connector Functions

Refer to Figure 10-1, Table 10-1, and Table 10-2 for a pin -by-pi n d escri pti on o f sig nal
functions. The controller interfaces with the transmitter through connectors J1, J2, and J5
and terminal board TB2 at the exciter back panel. J5 on the external I/O board connects to
a standard RL -XX3 receiver, if installed. If a standard receiver is not installed, TB2 on the
external I/O board connects to any generic receiver. TB2 also makes connections to
optional configurable QT-1000 alarm inputs and switching outputs. J1 on the internal
interface board connec ts directly t o TXC con nector J1, and interfaces a ll signals e xcept
ala rms. Ala rm sig nal s, c ons isti ng of tr ansm itte r al ar m, fau lt, and s tat us signa ls , ar e supp li ed
directly to the QT-1000 controller connector J2 though J2 on the internal interface board.

10.1.3 QT-1000 Interface Conversion Functions

Many of the signals exchanged between the controller and the exciter originate with a
format, voltage, or requirement incompatible with their destination. The QT-1000 interface
performs any signal conversions necessary to provide compatibility between the controller
and the exciter. The following text describes any signal conversions made by the controller
interface.

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 10-1

DSP Exciter Glenayre Document Number : 9110.00172
OPTIONS Issue 1, Rev. I: 01/15/97

10.1.3.1 Analog-Mode A/D Conversion

The exciter DSP modulato r circui t r eads s ynchroniz ed serial d ata for it s analog mo d e in p u t
signal, but the QT-1000 controller provides an analog signal. The controller interface
converts the analog to the appropriate data form for the DSP. The analog (FLA T AUDIO+,­) terminates across a balanced input circuit that also provides a level adjustment. The
adjustment, when properly set by the AUDIO INPUT ADJUST pot through the exciter
cover, provides analog to an A/D converter at the optimum zero-dBm level. The A/D
converts the analog into serial data, which is applied to the DSP through a synchronous data
link. A synchronous data link is characterized by an exchange of pulse streams for timing
purposes. The A/D converter is clocked by a pulse generator circuit driven by the ten-MHz
reference circuit.

10.1.3.2 FSK-Data-Bit Strapping

The exciter DSP modulator circuit can read up to four bits for its digital FSK mode input
signal, but the controller provi des two active bits 1 and 2 (DATA1, DATA2). This allows
transmitter operation in the two-level or four-level mode.

10.1.3.3 Channel-Select-Bit Strapping

The exciter MCU control circuit reads three bits to determine the remotely selected
channel, but the QT-1000 controlle r provides only bits 1 and 2 (CH SEL 1,2 ). As a resu lt,
the QT-1000 controller c an c ommand only four channels. T he c ontroller inter face keeps bit
3 open (h igh ). Table 10-2 defines the transm itter operating channel resulti ng from the
cha nn el sel ect inp uts.

10.1.3.4 Mode-Select-Bit Strapping

The ex citer M CU cont rol c ircu it re ads two bit s to determ in e th e rem otel y sel ecte d mo de,
but the QT-1000 controller provides only bit 1 (MODE CONTROL). As a result, the QT­1000 controller c an co mmand only two modes. The controller interface straps bit 2 to
ground (low). Table 10-3 defines the transmitter operating mode resulting from the model
select input.

10.1.3.5 Power Sample D/A Conversion

The QT-1000 controller reads two 0-to-2.5-volt voltages for its forward and reflected
power sample inputs, but these power values are stored as data in the excit er MCU control
circuit. The c ontro ller int erface convert s the data to volta ges of the a ppropriate ra nge f or
the QT-1000 contro ller . Data from the MCU representing t he forwar d and r e flected powers
is written i nto a dual D/A conv erter. The D/A c onverts t he data int o two p roportion al dc
voltages ranging from 0 volt to 2.5 volts (FWD PWR SAMPLE, REF PWR SAMPLE),
which are applied to the QT-1000 controller. Control logic gates ensure that data is written
to the proper half of the D/A converter.

Page: 10-2 Copyright © 1997 Glenayre Print Date: 02/19/97

dspsec10

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 OPTIONS

Table 10-1 Interface Board Connector J4 (QT-1000)

J4-X signal/de scription J4-X signal/d escr ip tion

1 FWD PWR SAMPLE, input from PA 14 AUDIO INPUT +, input from receiver or tx con-

troller
2 AUDIO INPUT -, common 15 REF PWR SAMPLE, input from PA
3 TX GND 16 TONE DECO DER OUTPUT, logic output to tx

controller
4 KEY IN, input from tx controller 17 DATA 1, digital data input from tx controller
5 DATA 2, digital data input f rom tx controller 18 DATA 3, digital data input from tx controller
6 CH SE L E C T 3, digi tal command in put fro m tx co n -

troller

7 MODE SELECT 2, digital command input from tx

controller
8 FAULT ALARM, digital output to tx controller 21 VSWR ALARM, logic output to tx controller
9 DATA4/CLK, input from tx controller 22 CH SEL ECT 1, logic input from tx controller
10 CH SELECT 2, logic inpu t from tx control ler 23 MOD IND, logic output to tx controller
11 LOW POWER ALARM, output to tx controller 24 TEMP ALARM, logic output to tx controller
12 SHUTDOWN ALARM, output to tx controller 25 RF INPUT ALARM, logic output to tx controller
13 n o t used -- --

19 MODE SELECT 1, digital command input from

tx controller

20 LOW POWER MODE, logic input from PA

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 10-3

DSP Exciter Glenayre Document Number : 9110.00172
OPTIONS Issue 1, Rev. I: 01/15/97

Table 10-2 Receiver Connector J5 Pin Functions

(QT-1000 with external I/O board)

J5-X function J5-X function

1 no connection 9 no connection
2 standard receiver audio input for i nterface,

10 no connection

2 Vp-p, nominal
3 no connection 1 1 return for standard receiver audio
4 no connection 12 standard receiver RSSI input for interface,

0.5-6.0 Vdc
5 no connection 13 no connection
6 standard receiver ground for interface 14 standard receiver-fault alarm input for inter-

face , LO=O K
7 no connection 15 no connection
8 standard receiver squelch output for inter-

face , HI =unsquel ched

Table 10-3 Remote Select Input vs. Channel (QT-1000)

selected

ch sel 1 J1-5 ch sel 2 J1-24 ch sel 3

channel

command open (HI) command open (HI) open (HI) 1
command ground (LO) command open (HI) open (HI) 2
command open (HI) command ground (LO) open (HI) 3
command ground (LO) command ground (LO) open (HI) 4

Table 10-4 Remote Select Input vs. Mode (QT-1000)

mode sel 1 J1-25 mode sel 2 J2-1 selected mode

command ground (LO) ground (LO) analog
command open (HI) ground (LO) 2-level
command open (HI) command open (HI) 4-level

Note

Not all transmitt ers can do all the modes.

Page: 10-4 Copyright © 1997 Glenayre Print Date: 02/19/97

dspsec10

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 OPTIONS

10.2 Exciter/PA Control with Standard Interface

The following major paragraphs describe the operation of the major items within the
standard interface. Detailed figures are referenced, as required.

The controller interface is the portion of exciter circuitry that connects the transmitter
controll er to the exc iter . The cont roller inter face dictate s what kind of trans mitter controll er
may operate the transmitter. The transmitter can be operated through one of several control­lers depending on the interface circuitry installed at the exciter. The remainder of section

10.2 describes standard controller interface circuitry.

Two boards form this interface, the internal standard interface board and the external
exciter standard interface I/O board.

Control commands from the transmitter controller are connected through the interface
circuit. This circuit supplies remote control to the microcontroller unit (MCU) control
circuit. The VT-100 VDT supplies local control. The MCU control circuit generates all
control signals for the other circuits, and monitors their status. The MCU control circuit
reports status back to the VT-100 VDT and the interface circuit, whi ch supplies the status
to th e t r ansmitter co ntroller.

10.2.1 Reference Source

The ten-MHz reference signal is provided by the controller via J8 on the exciter/control
board. All other inputs and outputs, except for RF output, are routed through the standard

10.2.2 Controller Interface Connector Functions

10.2.3 Standard Interface Conversion Functions

int erface bo ard .

Refer to Table 10-1, Interface Board Connector J4 (QT-1000), for a pin-by-pin descrip-
tion of si gnal functions. The controlle r int erfaces with the trans mitte r thr ou gh connec tor J4
and terminal board TB2 at the exciter back panel. TB2 also makes connections to optional
configurable alarm inpu ts and switc hin g outputs .

Many of the signals exchanged between the controller and the exciter originate with a
format, voltage, or requirement incompatible with their destination. The standard interface
performs any signal conversions necessary to provide compatibility between the controller
and the exciter. The following text describes any signal conversions made by the controller
interface.

10.2.3.1 Analog-Mode A/D Conversion

The exciter DSP modulato r circui t r eads s ynchroniz ed serial d ata for it s analog mo d e in p u t
signal, but the transmitter controller provides an analog signal. The controller interface
converts the ana log to the ap propriate dat a form for th e DSP. The ana log (FLAT AUDIO
+,-) terminates across a balanced input circuit that also provides a level adjustment. The
adjustment, when properly set by the AUDIO INPUT ADJUST pot through the exciter
cover, provides analog to an A/D converter at the optimum zero-dBm level. The A/D

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 10-5

DSP Exciter Glenayre Document Number : 9110.00172
OPTIONS Issue 1, Rev. I: 01/15/97

converts the analog into serial data, which is applied to the DSP through a synchronous data
link. A synchronous data link is characterized by an exchange of pulse streams for timing
purposes. The A/D converter is clocked by a pulse generator circuit driven by the exciter’s
ten-MHz reference circuit.

10.2.3.2 FSK-Data-Bit Strapping

The exciter DSP modulator circuit can read up to four bits for its digital FSK mode input
signal, but the controller provi des two active bits 1 and 2 (DATA1, DATA2). This allows
transmitter operation in the two-level or four-level mode.

10.2.3.3 Channel-Select-Bit Strapping

The exciter MCU control circuit reads three bits to determine the remotely selected
channel, and the transmitter controller provides bits 1, 2, and 3 (CH SEL 1,2,3). As a result,
the transmitter controller can command all eight of the possible channels. Table 10-3,

Remote Select Input vs. Channel (QT-1000), defines the transmitter operating channel

resultin g from the chan ne l sel ec t inpu ts.

10.2.3.4 Mode-Select-Bit Strapping

The ex citer M CU cont rol c ircu it re ads two bit s to determ in e th e rem otel y sel ecte d mo de,
but the transmi tter controller provide s only bit 1 (MODE CONT ROL ). As a result, the
transmitter controller can command three of the transmitter’s four possible modes.

Table 10-4, Remote Select Input vs. Mode (Q T-1000), defin es the tr an smitter operating

mode resulti n g from the mod el sele ct input .

10.2.3.5 Power Sample D/A Conversion

The transmitter c ontroller reads two 0-to-2.5-volt volt ages for its forward and reflected
power sample inputs, but these power values are stored as data within the exciter’s MCU
control circuit. The controller interface converts the data to voltages of the appropria te
range for the transmitter controller. Data from the MCU representing the forward and
reflected powers is written into a d ual D/ A c o nve rte r. The D/ A co nve rts t he da ta i n to t wo
proportional dc voltages ranging fro m 0 volt to 2.5 volts ( FWD PWR SAMP LE, REF PWR
SAMPLE), w hich are applie d to the transm itter contro ller. Control logic gates en sure that
data is written to the proper ha lf of the D/A convert er.

Page: 10-6 Copyright © 1997 Glenayre Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 OPTIONS

Table 10-5 Interface Board Connector J4 (Sta ndard)

J4-X signal/descr iption J4-X signal/description

1 FWD PWR SAMPL E, input from PA 14 AUDIO INPUT -, input from receiver or tx controller
2 AUDIO INPUT +, common 15 REF PWR SAMPLE, input from P A
3 TX GND 16 TONE DECODER OUTPUT, logic output to tx con-

troller

4 KEY IN, input from tx controller 17 DATA 1, digital data input f rom tx controller

dspsec10

5 DATA 2, digital data input from tx controller 18 DATA 3, digital data input from tx controller
6 CH SELECT 3, digital command input from tx

controller

7 MODE SEL ECT 2, digital command input

from tx controller
8 FAULT ALARM, digital output to tx controller 21 VSWR ALARM, logic output to tx controller
9 DATA4/CL K, input from tx controller 22 CH SELECT 1, logic input f rom tx controller
10 CH SELEC T 2, log ic input from tx con troller 23 MOD IND, log i c output to tx control ler
11 LOW POWER ALARM, output to tx controller 24 TEMP ALARM, logic output to tx controller
12 SHUTDOW N ALA RM, output to tx controller 25 RF INPUT ALARM, logic output to tx controller
13 not used -- --

Table 10-6 Remote Select Input vs. Channel (standard)

ch sel 1 J1-5 ch sel 2 J1-24 ch sel 3

19 MODE SELECT 1, digital command input from tx

contro ll er

20 LOW POWER MODE, logic input from PA

selected
channel

command open (HI) command open (HI) open (HI) 1
command ground (LO) command open (HI) open (HI) 2
command open (HI) command ground (LO) open (HI) 3
command ground (LO) command ground (LO) open (HI) 4
command open (HI) command open (HI) command ground (LO) 5
command ground (LO) command open (HI) command ground (LO) 6
command open (HI) command ground (LO) command ground ( LO) 7
command ground (LO) command ground (LO) command ground (LO) 8

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 10-7

DSP Exciter Glenayre Document Number : 9110.00172
OPTIONS Issue 1, Rev. I: 01/15/97

Table 10-7 Remote Select Input vs. Mode (standard)

mode sel 1 J1-25 mode sel 2 J2-1 selected mode

command ground (LO) ground (LO) analog
command ope n (HI) gro und (L O ) 2-level
command ope n (HI) co mm and open (H I) 4-level

Note

Not all transmitt ers can do all the modes.

10.3 Exciter/PA Control with I20 Interface

The following m ajor paragra phs describe the o peration of the ma jor item s withi n the I2 0
interface. Deta iled figures are refe ren ced , as require d.

The controller interface is the portion of exciter circuitry that connects the transmitter
controll er to the exc iter . The cont roller inter face dictate s what kind of trans mitter controll er
may operate the transmitter. The transmitter can be operated through one of several control­lers depending on the interface circuitry installed at the exciter. The remainder of section

10.3 describes I20 cont ro ller int erfac e circu i try.

Two boards form this interface, the internal I20 interface board and the external I20
int erface I /O b oard.

Control commands from the transmitter controller are connected through the interface
circuit. This circuit supplies remote control to the microcontroller unit (MCU) control
circuit. The VT-100 VDT supplies local control. The MCU control circuit generates all
control signals for the other circuits, and monitors their status. The MCU control circuit
reports status back to the VT-100 VDT and the interface circuit, which supplies the status
to th e t r ansmitter co ntroller.

10.3.1 Reference Source

The ten-MHz reference signal is provided by the controller via J8 on the exciter/control
board.

10.3.2 Controller Interface Connector Functions

Refer to Table 10-8 and Table 10-9 for a pin-by-pin desc ription o f signal functi ons. Th e
exciter in te rf ac es w ith the tran smitter th rou g h conn e cto r J2 an d the cont ro ll er thro ug h J 1.

Page: 10-8 Copyright © 1997 Glenayre Print Date: 02/19/97

dspsec10

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 OPTIONS

10.3.3 I20 Interface Conversion Functions

Many of the signals exchanged between the controller and the exciter originate with a
format, voltage, or requirement incompatible with their destination. The I20 interface
performs any signal conversions necessary to provide compatibility between the controller
and the exciter. The following text describes any signal conversions made by the controller
interface.

10.3.3.1 Analog-Mode A/D Conversion

The exciter DSP modulato r circui t r eads s ynchroniz ed serial d ata for it s analog mo d e in p u t
signal, but the transmitter controller provides an analog signal. The controller interface
converts the ana log to the ap propriate dat a form for th e DSP. The ana log (FLAT AUDIO
+,-) terminates across a balanced input circuit that also provides a level adjustment. The
adjustment, when properly set by the AUDIO INPUT ADJUST pot through the exciter
cover, provides analog to an A/D converter at the optimum zero-dBm level. The A/D
converts the analog into serial data, which is applied to the DSP through a synchronous data
link. A synchronous data link is characterized by an exchange of pulse streams for timing
purposes. The A/D converter is clocked by a pulse generator circuit driven by the ten-MHz
reference circuit.

10.3.3.2 FSK-Data-Bit Strapping

The exciter DSP modulator circuit can read up to four bits for its digital FSK mode input
signal, but the controller provi des two active bits 1 and 2 (DATA1, DATA2). This allows
transmitter operation in the two-level or four-level mode.

10.3.3.3 Channel-Select-Bit Strapping

The exciter MCU control circuit reads three bits to determine the remotely selected
channel, and the transmitter controller provides bits 1, 2, and 3 (CH SEL 1,2,3). As a result,
the transmitter controller can command all eight of the possible channels. Table 10-3
defines the transmitter operating channel resulting from the channel select inputs.

10.3.3.4 Mode-Select-Bit Strapping

The ex citer M CU cont rol c ircu it re ads two bit s to determ in e th e rem otel y sel ecte d mo de,
and the transmitter controller provides two bits (MODE SEL ECT 1, MODE SELE CT 2).
As a result, the transmitter controller can command three of the transmitter’s four possible
modes. Table 10-4 defines the transmitter operating mode resulting from the model select
input.

10.3.3.5 Power Sample D/A Conversion

The transmitter c ontroller reads two 0-to-2.5-volt volt ages for its forward and reflected
power sample i n puts, bu t t h ese power va lu e s are s tored as d a ta w it h in the ex ci te r’s MCU
control circuit. The controller interface converts the data to voltages of the appropria te
range for the transmitter controller. Data from the MCU representing the forward and
reflected powers is written into a d ual D/ A c o nve rte r. The D/ A co nve rts t he da ta i n to t wo

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 10-9

DSP Exciter Glenayre Document Number : 9110.00172
OPTIONS Issue 1, Rev. I: 01/15/97

proportional dc voltages ranging fro m 0 volt to 2.5 volts ( FWD PWR SAMP LE, REF PWR
SAMPLE), w hich are applie d to the transm itter contro ller. Control logic gates en sure that
data is written to the proper ha lf of the D/A convert er.

Table 10-8 Interface Board Connector J1

J1-X signal/description J1-X signal/description

1 CHASSIS 20 CLOCK­2 CLOCK+ 21 DATA0­3 DATA0+ 22 DATA1­4 DATA1+ 23 DATA2­5 DATA2+ 24 DATA3­6DATA3+ 25 GND
7 FREQ0 26 FREQ1
8 FREQ2 27 MODE 0
9 MODE 1 28 MODE/AUX
10 ANALOG+ 29 ANALOG­11 GND 30 GND
12 RxD- 31 RxD+
13 TxD- 32 TxD+
14 KEY- 33 KEY+
15 DIG OUT 6 34 DIG OUT 7
16 DIG OUT 4 35 DIG OUT 5
17 DIG OUT 2 36 DIG OUT 3
18 DIG OUT 0 37 DIG OUT 1
19 _RESET

Page: 10-10 Copyright © 1997 Glenayre Print Date: 02/19/97

Glenayre Document Number: 9110.00172 DSP Exciter
Issue 1, Rev. I: 01/15/97 OPTIONS

Table 10-9 Interface Board Connector J2

J2-X signal/description J2-X signal/description

1 not used 8 GND
2TxD+ 9 TxD­3 KEY+ 10 KEY­4 RxD+ 11 RxD­5 D ATA0+ 12 DATA0-

dspsec10

6 CLOCK+ 13 CLOCK­7 D ATA1+ 14 DATA1-

Table 10-10 Remote Select Input vs. Channel (I20)

ch sel 1 J1 ch sel 2 J1 ch sel 3 selected channel

command open (HI) command open (HI) open (HI) 1
command ground (LO) command open (HI) open (HI) 2
command open (HI) command ground ( LO) open (HI) 3
command ground (LO) command ground (LO) open (HI) 4
command open (HI) command open (HI) command

ground (LO)

command ground (LO) command open (HI) command

ground (LO)

command open (HI) c ommand ground (LO) command

ground (LO)

command ground (LO) command ground (LO) command

ground (LO)

5

6

7

8

Table 10-11 Remote Select Input vs. Mode (I20)

mode sel 1 J1-25 m ode sel 2 J2-1 selected mode

command ground (LO) ground (LO) analog
command open (HI) ground (LO) 2-level
command open (HI) command open (HI) 4-level

Print Date: 02/19/97 Copyright © 1997 Glenayre Page: 10-11

DSP Exciter Glenayre Document Number : 9110.00172
OPTIONS Issue 1, Rev. I: 01/15/97

Page: 10-12 Copyright © 1997 Glenayre Print Date: 02/19/97