Datron PRC1099A User manual

PRC1099A
HF Transceiver
Technical Manual
Manual Part No. PRC1099A-MS
Release Date: February 2017
Revision: S

Datron World Communications Inc.
995 Joshua Way, Suite A
Vista, CA 92081, U.S.A.
Phone: [phone] Fax: [phone]
E-Mail: [e-mail]
www.dtwc.com

PRC1099A-MS i
Revision History
Date of
Revision
Revision
Letter Description of Changes Pages Affected
2/06 M Changes to format, text, boards, schematics and
part lists.
All
4/08 N Revised to describe new Synthesizer board. Chapter 3
Chapter 4
5/10 P Battery pack, weight, duty cycle, audio specs.
Add internal option PRC1099A-IP.
Remove reference to internal option (1099AME).
Update boards, schematics, part lists.
1-2
1-3, 6-19
Chapter 6
Chapters 3, 4, 6
6/11 R Update component locations diagrams, schematics
and parts lists to the latest revisions.
Chapter 4,
Chapter 6
02/17 S Updated manual format.
Eliminated Chapter 2: Installation. This information
is covered in the Operator manual.
Renamed and restructured Chapters 3 and 4.
Divided Chapter 4 into separate chapters for each
board.
Added Front Panel Assembly chapter.
Updated component locations diagrams,
schematics, and parts lists to the latest revision.
Removed references to internal battery charger.
This option is now obsolete.
All
All
Chapter 3, 4
Chapter 12
All
Chapter 11

PRC1099A-MS iii
Warranty
© 2017 Datron World Communications, Inc. (Datron)
All rights reserved.
Datron World Communications, Inc.
This manual, as well as the software described in it, is furnished
under license and may only be used or copied in accordance
with the terms of such license. The information in this manual is
furnished for informational use only, and is subject to change
without notice. It should not be construed as a commitment by
Datron. Datron assumes no responsibility or liability for any
errors or inaccuracies that may appear in this book.
Except as permitted by such license, no part of this publication
may be reproduced, stored in a retrieval system, or transmitted,
in any form or by any means, electronic, mechanical, recording,
or otherwise without the prior written permission of Datron.
Software License Agreement and Warranty
This software is licensed to the user (licensee) under the
express terms and conditions of Datron’s software licensing
policies and agreement as outlined below. By receiving and
installing this software package the user (licensee) has
indicated acceptance of the terms and conditions of this
agreement presented herewith.
As used in this document, the term “Software” shall refer to the
application or control software in machine readable format and
the hardware protection key, along with any or all supporting
documentation, as well as all updated or enhanced versions of
the program supplied to the user at later date(s). This software
license does not include source code, and therefore, no license
is granted with respect to source code of any kind utilized
directly or indirectly in any Datron or Datron supplied third party
product. Note, in some cases, covered software may be
included in Datron products in RAM or ROM, and/or forms of
machine readable code, not readily accessible to the user or
licensee.
In consideration of the terms and conditions of this agreement,
Datron grants the user a non-exclusive, nontransferable license
to install and operate one copy of the program. Licensee agrees
not to attempt, aid, authorize, or direct any effort, either directly
or indirectly to reverse engineer or reverse compile the
Software. Licensee further agrees they or their agents are not
authorized to make derivative versions or changes to the
Software.
Title to and ownership of the Software shall at all times remain
with Datron and/or its licensors. Further, no license is granted to
copy or reproduce in any form whatsoever the Software
supplied without the express written permission of Datron, prior
to any such contemplated action.
Datron may terminate this agreement and discontinue further
warranty coverage at any time due to failure to comply with the
terms and conditions of this agreement.
In such an event, Datron will provide the user with written notice
of such a “failure-to-comply” and the user will have 10 days to
demonstrate that a remedy has been implemented. If the user
fails to perform, the agreement will be terminated by further
written notice from Datron. Upon termination, the user shall
immediately return all original Software, documentation, and
any copies of each to Datron.
This Software is licensed “AS IS” and Datron provides a
warranty that covers the media upon which the Software is
embedded for a period of 30 days from receipt of the product.
Under this warranty policy Datron’s sole obligation shall be to
replace or repair, at Datron’s discretion, any such media that in
Datron’s opinion proves defective.
The user is obligated to provide Datron with a detailed
description of possible defects along with sample material such
that Datron can reproduce the identified defects.
By receipt and use, user (licensee) acknowledges that certain
software developed or distributed by Datron is controlled by one
or more governmental agencies. The user (licensee) herewith
acknowledges they will take all necessary actions to comply
with applicable regulations concerning the use of licensed
software. Further, Datron is under no obligation to supply source
code or documentation of its software for any reason.
Datron makes no representation, express or implied, with
respect to any Software licensed under this document as to its
fitness for any particular purpose or intended use.
Furthermore, Datron shall have no liability under this agreement
for any incidental, special, or consequential damages arising
out of the use of any supplied software programs. Datron
reserves the right to make periodic changes in it’s software for
any purpose without any obligation to notify users.

iv PRC1099A-MS
One Year Limited Warranty and Remedies
Datron warrants that its equipment is free from defects in
design, materials, and workmanship for a period of 12 months
from the date of installation of the equipment, but in no event
later than 15 months from the date of shipment. If the
equipment does not provide satisfactory service due to defects
covered by this warranty, Datron will, at its option, replace or
repair the equipment free of charge.
Should it be impractical to return the equipment for repair,
Datron will provide replacements for defective parts contained in
the equipment for a period of 12 months from the date of
installation of the equipment, but in no event later than 15
months from the date of shipment.
This warranty is limited to the original purchaser and is not
transferable. Repair service performed by Datron is warranted
for the balance of the original warranty or 90 days, whichever is
longer.
Exclusive Warranty
There are no other warranties beyond the warranty as
contained herein. No agent, employee, or representative of
Datron has any authority to bind Datron to any affirmation,
representation, or warranty concerning the equipment or its
parts that is not in conformity with the warranties contained
herein.
EXCEPT AS EXPRESSLY SET FORTH ABOVE, NO OTHER
WARRANTIES, EITHER EXPRESSED OR IMPLIED, ARE
MADE WITH RESPECT TO THE EQUIPMENT OR THE
PARTS CONTAINED THEREIN, INCLUDING BUT NOT
LIMITED TO THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE, AND DATRON EXPRESSLY DISCLAIMS ALL
WARRANTIES NOT STATED HEREIN.
Limitations of Warranty
This warranty does not cover: Physical damage to the
equipment or its parts that does not involve defects in design,
material, or workmanship, including the following:
- Damage by impact, liquids, temperature, or gases.
- Damage to the equipment or its parts caused by
lightning, static discharge, voltage transients, or
application of incorrect supply voltages.
- Defects or failures caused by unauthorized attempts to
repair or modify the equipment.
- Defects or failures caused by Buyer abuse or misuse.
Return of Equipment - Domestic
To obtain performance of any obligation under this warranty, the
equipment must be returned freight prepaid to:
Technical Support Services
Datron World Communications Inc.
3055 Enterprise Court
Vista, California 92081
The equipment must be packed securely. Datron shall not be
responsible for any damage incurred in transit. A letter
containing the following information must be included with the
equipment:
a. Model, serial number, and date of installation.
b. Name of dealer or supplier of the equipment.
c. Detailed explanation of problem.
d. Return shipping instructions.
e. Telephone or fax number where Buyer may be contacted.
Datron will return the equipment prepaid by United Parcel
Service, Parcel Post, or truck. If alternate shipping is specified
by Buyer, freight charges will be made collect.
Return of Equipment - International
Contact Datron or your local Representative for specific
instructions. Do not return equipment without authorization. It is
usually not possible to clear equipment through U.S. Customs
without the correct documentation. If equipment is returned
without authorization, Buyer is responsible for all taxes,
customs duties, clearance charges, and other associated costs.
Parts Replacement
The following instructions for the supply of replacement parts
must be followed:
a. Return the parts prepaid to:
“Customer Service”
Datron World Communications Inc.
3055 Enterprise Court
Vista, California 92081; and
b. Include a letter with the following information:
1. Part number
2. Serial number and model of equipment
3. Date of installation
Parts returned without this information will not be replaced. In
the event of a dispute over the age of the replacement part,
components date-coded over 24 months previously will be
considered out of warranty.
Remedies
Buyer’s sole remedies and the entire liability of Datron are set
forth above. In no event will Datron be liable to Buyer or any
other person for any damages, including any incidental or
consequential damages, expenses, lost profits, lost savings, or
other damages arising out of use of, or inability to use the
equipment.

PRC1099A-MS v
Safety Considerations
This product and manual must be thoroughly understood before
attempting installation and operation. To do so without proper
knowledge can result in equipment failure and bodily injury.
Caution: Before applying AC power, be sure that the
equipment has been properly configured for the
available line voltage. Attempted operation at
the wrong voltage can result in damage and
voids the warranty. See the manuals section on
installation. DO NOT operate equipment with
cover removed.
Earth Ground
All Datron products are supplied with a standard, 3-wire,
grounded AC plug. DO NOT attempt to disable the ground
terminal by using 2-wire adapters of any type. Any
disconnection of the equipment ground causes a potential
shock hazard that could result in personal injury. DO NOT
operate any equipment until a suitable ground has been
established. Consult the manual section on grounding.
Servicing
Only trained personnel should perform product repair. To avoid
electric shock, DO NOT open the case unless qualified to do so.
Various measurements and adjustments described in this
manual are performed with AC power applied and the protective
covers removed. Capacitors (particularly the large power supply
electrolytic type) can remain charged for a considerable time
after the unit has been shut off. Use particular care when
working around them, as a short circuit can release sufficient
energy to cause damage to the equipment and possible injury.
To protect against fire hazard, always replace line fuses with
ones of the same current rating and type (normal delay,
slow blow, etc.). DO NOT use higher value replacements in an
attempt to prevent fuse failure. If fuses are failing repeatedly this
indicates a probable defect in the equipment that needs
attention.
Use only genuine Datron factory parts for full performance and
safety of this product.
Made in the USA

PRC1099A-MS vii
Contents
Chapter 1: Introduction
1.1 The PRC1099A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.2 Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.3 Reference Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.4 Glossary of Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Chapter 2: System Overview
2.1 Frequency Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Figure 2-1 Frequency Conversion Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
2.2 DDS Synthesizer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.3 Processor Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.4 Receive Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.5 Transmit Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.6 DC Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Table 2-1 Board Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
2.7 Radio Menu Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Table 2-2 Menu Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11
Figure 2-2 PRC1099A System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . .2-14
Figure 2-3 PRC1099A Wiring Diagram (994171 Rev. C) . . . . . . . . . . . . . . . . . .2-15
Table 2-3 Mainframe Parts List (PRC1099ABA Rev. T) . . . . . . . . . . . . . . . . . . .2-17
Chapter 3: Audio/Filter Board
3.1 Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Figure 3-1 Audio/Filter Board Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Table 3-1 Audio/Filter Board Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8
3.2 Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Table 3-2 J1 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-9
Table 3-3 J2 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-10

viii PRC1099A-MS
Table 3-4 J3 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-10
Table 3-5 J4 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-11
Table 3-6 J5 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-12
Table 3-7 J6 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-12
3.3 Component Locations, Schematics, and Parts List . . . . . . . . . . . . . 3-13
Figure 3-2 Audio/Filter Board Component Locations (738221 Rev. J) . . . . . . . .3-14
Figure 3-3 Audio/Filter Board Schematic Diagram 1 of 2 (994172 Rev. L) . . . . .3-15
Figure 3-4 Audio/Filter Board Schematic Diagram 2 of 2 (994172 Rev. L) . . . . .3-17
Table 3-8 Audio/Filter Board Parts List (009-00101 Rev. AK) . . . . . . . . . . . . . .3-19
Chapter 4: 1650 kHz IF Board
4.1 Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Figure 4-1 1650 kHz IF Board Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Table 4-1 1650 kHz IF Board Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
4.2 Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Table 4-2 J1 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4
4.3 Component Locations, Schematics, and Parts List . . . . . . . . . . . . . . 4-5
Figure 4-2 1650 kHz IF Board Component Locations (738028 Rev D) . . . . . . . . .4-6
Figure 4-3 1650 kHz IF Board Schematic Diagram (994207 Rev. B) . . . . . . . . . .4-7
Table 4-3 1650 kHz IF Board Parts List (009-00202 Rev. R) . . . . . . . . . . . . . . . .4-9
Chapter 5: Mixer Board
5.1 Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Figure 5-1 Mixer Board Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Figure 5-2 ALC Frequency vs PA Output Power . . . . . . . . . . . . . . . . . . . . . . . . . .5-5
Figure 5-3 AME Option Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7
Table 5-1 Mixer Board Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7
5.2 Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Table 5-2 J1 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-8
Table 5-3 Coax Cable Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-9
5.3 Component Locations, Schematics, and Parts List . . . . . . . . . . . . . . 5-9
Figure 5-4 Mixer Board Component Locations (738217 Rev. H) . . . . . . . . . . . . .5-10
Figure 5-5 Mixer Board Schematic Diagram 1 of 3 (994173 Rev. Y). . . . . . . . . .5-11
Figure 5-6 Mixer Board Schematic Diagram 2 of 3 (994173 Rev. Y). . . . . . . . . .5-13
Figure 5-7 Mixer Board Schematic Diagram 3 of 3 (994173 Rev. Y). . . . . . . . . .5-15
Table 5-4 Mixer Board Parts List (009-00301 Rev. AU) . . . . . . . . . . . . . . . . . . .5-17
Chapter 6: Power Amplifier Board
6.1 Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Figure 6-1 Power Amplifier Board Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . .6-1

PRC1099A-MS ix
Table 6-1 Power Amplifier Board Specifications. . . . . . . . . . . . . . . . . . . . . . . . . .6-3
6.2 Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Table 6-2 J1 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-4
6.3 Component Locations, Schematics, and Parts List . . . . . . . . . . . . . . 6-5
Figure 6-2 Power Amplifier Board Component Locations (738617 Rev. C). . . . . .6-6
Figure 6-3 Power Amplifier Board Schematic Diagram (990990 Rev. H) . . . . . . .6-7
Table 6-3 Power Amplifier Board Parts List (009-00403 Rev. F) . . . . . . . . . . . . .6-9
Chapter 7: Antenna Tuner Board
7.1 Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Figure 7-1 Antenna Tuner Board Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . .7-3
Table 7-1 Antenna Tuner Board Specifications . . . . . . . . . . . . . . . . . . . . . . . . . .7-6
7.2 RF Paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7
7.3 Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7
Table 7-2 J1 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-7
7.4 Component Locations, Schematics, and Parts List . . . . . . . . . . . . . . 7-8
Figure 7-2 Antenna Tuner Driver Board Component Locations (738346 Rev. B) .7-9
Figure 7-3 Antenna Tuner Board Component Locations (738027 Rev. D) . . . . .7-10
Figure 7-4 Antenna Tuner & Driver Board Schematic Diagram (994303 Rev. B)7-11
Table 7-3 Antenna Tuner Driver Board Parts List (009-00502 Rev. K) . . . . . . .7-13
Table 7-4 Antenna Tuner Board Parts List (009-00503 Rev. K) . . . . . . . . . . . . .7-16
Chapter 8: Synthesizer Board
8.1 Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Figure 8-1 Synthesizer Board Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-1
Table 8-1 Sample FTW Programming Values . . . . . . . . . . . . . . . . . . . . . . . . . . .8-4
8.2 Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Table 8-2 J1 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-4
8.3 Component Locations, Schematics, and Parts List . . . . . . . . . . . . . . 8-5
Figure 8-2 Synthesizer Board Component Locations (738025 Rev. A) . . . . . . . . .8-6
Figure 8-3 Synthesizer Board Schematic Diagram 1 of 6 (994073 Rev. D). . . . . .8-7
Figure 8-4 Synthesizer Board Schematic Diagram 2 of 6 (994073 Rev. D). . . . . .8-9
Figure 8-5 Synthesizer Board Schematic Diagram 3 of 6 (994073 Rev. D). . . . .8-11
Figure 8-6 Synthesizer Board Schematic Diagram 4 of 6 (994073 Rev. D). . . . .8-13
Figure 8-7 Synthesizer Board Schematic Diagram 5 of 6 (994073 Rev. D). . . . .8-15
Figure 8-8 Synthesizer Board Schematic Diagram 6 of 6 (994073 Rev. D). . . . .8-17
Table 8-3 Synthesizer Board Parts List (009-00606 Rev. P) . . . . . . . . . . . . . . .8-19

xPRC1099A-MS
Chapter 9: Processor Board
9.1 Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
Figure 9-1 Processor Board Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-2
Table 9-1 Processor Board Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-8
9.2 Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-9
Table 9-2 J1 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-9
Table 9-3 J2 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-9
Table 9-4 J3 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-10
Table 9-5 J4 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-11
Table 9-6 J5 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-11
9.3 Component Locations, Schematics, and Parts List . . . . . . . . . . . . . 9-13
Figure 9-2 Processor Board Component Locations (738218 Rev. B) . . . . . . . . .9-14
Figure 9-3 Processor Board Schematic Diagram (994183 Rev. M). . . . . . . . . . .9-15
Table 9-7 Processor Board Parts List (009-10702 Rev. W) . . . . . . . . . . . . . . . .9-17
Chapter 10: Display Board
10.1 Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
10.2 Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2
Table 10-1 J1 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-2
Table 10-2 J2 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-4
Table 10-3 J3 Connect Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-5
Table 10-4 J4 Connect Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-6
10.3 Component Locations, Schematics, and Parts List . . . . . . . . . . . . . 10-7
Figure 10-1 Display Board Component Location Diagram (738220 Rev. G) . . . . .10-8
Figure 10-2 Display Board Schematic Diagram (994165 Rev. B) . . . . . . . . . . . . .10-9
Table 10-5 Display Board Parts List (009-10801 Rev. L) . . . . . . . . . . . . . . . . . .10-11
Chapter 11: Junction Board
11.1 Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
11.2 Connector Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-2
Table 11-1 J3 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-2
Table 11-2 J3 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-2
11.3 Component Locations, Schematics, and Parts List . . . . . . . . . . . . . 11-3
Figure 11-1 Junction Board Component Locations (738222 Rev. F). . . . . . . . . . .11-4
Figure 11-2 Junction Board Schematic Diagram (994164 Rev. F) . . . . . . . . . . . .11-5
Table 11-3 Junction Board Parts List (009-00901 Rev. W) . . . . . . . . . . . . . . . . .11-7

PRC1099A-MS xi
Chapter 12: Front Panel Assembly
Figure 12-1 Front Panel Assembly (Rear View). . . . . . . . . . . . . . . . . . . . . . . . . . .12-1
12.1 Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
Table 12-1 Channel Switch BCD Code to Processor . . . . . . . . . . . . . . . . . . . . . .12-1
Figure 12-2 Channel Switch (S1) Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-2
Figure 12-3 Power Switch Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-3
Figure 12-4 Mode and Option Switch Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . .12-4
Figure 12-5 Digit and Tune Switches Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . .12-6
12.2 Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-7
Table 12-2 Supported Audio Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-7
Figure 12-6 Audio Connector Board Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-8
Table 12-3 Supported Accessory Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-8
Chapter 13: Internal Options
13.1 Automatic Link Establishment Option (1099ALE). . . . . . . . . . . . . . . 13-1
Figure 13-1 ALE Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-1
Table 13-1 J1 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-5
Figure 13-2 ALE Signal Connections and Adjustment Points . . . . . . . . . . . . . . . .13-6
Figure 13-3 ALE Board Component Locations 1 of 2 (738215 Rev. B) . . . . . . . . .13-7
Figure 13-4 ALE Board Component Locations 2 of 2 (738215 Rev. B) . . . . . . . . .13-8
Figure 13-5 ALE Board Schematic Diagram (994166 Rev. G) . . . . . . . . . . . . . . .13-9
Table 13-2 ALE Board Parts List (010-00200 Rev. V) . . . . . . . . . . . . . . . . . . . .13-11
13.2 Internet Protocol Interface (PRC1099A-IP). . . . . . . . . . . . . . . . . . . . 13-14
Chapter 14: Maintenance
14.1 Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-1
Table 14-1 Test Equipment List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-1
14.2 Measurement Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-2
Figure 14-1 Power Measurement Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-3
Figure 14-2 Two-Tone Test Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-4
14.3 Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-4
Figure 14-3 Battery Case Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-5
Figure 14-4 Radio Case Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-6
Figure 14-5 Board Locations (Top) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-6
Figure 14-6 Board Locations (Bottom) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-7
14.4 Semiconductor Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-14
14.5 Component Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-15
14.6 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-16
Table 14-2 General Fault Location Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-16

xii PRC1099A-MS
Table 14-3 Fault Location Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-17
14.7 Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-23
Table 14-4 Adjustment Potentiometers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-23
Figure 14-7 Audio/Filter Signal Connections and Adjustment Points. . . . . . . . . .14-24
Table 14-5 1650 kHz IF Board Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-25
Figure 14-8 1650 kHz IF Board Adjustment Points . . . . . . . . . . . . . . . . . . . . . . .14-25
Table 14-6 Mixer Board Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-25
Figure 14-9 Mixer Board Signal Connections and Adjustment Points . . . . . . . . .14-26
Table 14-7 PA Board Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-27
Figure 14-10 PA Board Signal Connections and Adjustment Points . . . . . . . . . . .14-27

PRC1099A-MS 1-1
Chapter 1: Introduction
1.1 The PRC1099A
The PRC1099A is an HF/SSB tactical manpack transceiver designed for
demanding high-visibility battlefield applications. It is rugged, lightweight,
easy to use, and configurable with numerous add-on accessories to create a
wide variety of manpack, mobile or base station systems.
The PRC1099A includes the following features:
• 1.6 to 30 MHz transmit frequency range adjustable in 10 Hz steps
• Menu-driven control from front panel LCD
• Rugged chassis configurable for manpack, mobile and base station
systems
• ALE option
This manual provides technical information for the service and repair of the
PRC1099A. Included are schematic diagrams, operational theory, test and
alignment procedures and detailed parts lists. For installation and operation
instruction, refer to the PRC1099A-MSOP operator manual.

1: Introduction
1-2 PRC1099A-MS
1.2 Technical Specifications
Note: Specifications are subject to change without notice or obligation.
Characteristic Specification
General
Frequency Range 1.6 to 30 MHz
Available Channels 2,840,000 in 10 Hz steps
Preset Channels 100 programmable memory channels
Scanning Radio and ALE scan modes
Channel Programming From front panel or remotely via computer
Modes USB, LSB, CW, AME; simplex or half-duplex
Input Power 11 to 15 VDC
Battery Pack BB-LA6 sealed lead calcium
BA5598/
Low Battery Indicator LCD battery icon
Antenna Port BNC for 50 ohm broadband antennas or for
connection to external amplifier; whip antenna port
Display Multifunction custom LED with backlight
Mechanical/Environmental
Size
W x H x D, including
battery pack
11.1 in. x 4.1 in. x 9.25 in.
(28.2 cm x 10.5 cm x 23.5 cm);
Weight 9.7 lb. (4.4 kg) without battery pack;
BB-LA6 pack 5.2 lb. (2.4 kg)
Package Olive drab green, sealed, including battery pack
Temperature -30° to +60°C, operating
Shock, Vibration,
Humidity, Fungus,
Altitude
Per MIL-STD-810
Transmitter
RF Power Output 5/20W, PEP, or average, in manpack;
5/20/100/400W in mobile configuration
Duty Cycle Continuous duty service at 5W
Harmonics -50 db (2 to 30 MHz)
Receiver
Sensitivity 10 db SINAD for 0.5 uV input

1: Introduction
PRC1099A-MS 1-3
1.3 Reference Manual
Refer to the PRC1099A-MSOP operator manual for detailed information on
operating and programming the PRC1099A radio set.
1.4 Glossary of Terms
ALE Automatic link establishment. A complex system that
combines software and hardware to establish the best quality
communications link between two or more radios.
AM Amplitude modulation. A common form of modulation where
the modulating signal varies the amplitude of the carrier signal.
AME Amplitude modulation enhanced. A single sideband
transmission with an inserted carrier which can be received on
radios that can only receive AM modulated transmissions.
Signals can also be transmitted using single sideband and
received with an AM receiver.
BITE Built-in-test-equipment. Internal firmware that tests the
installed hardware and boards in the radio to verify presence
and functionality.
CW Continuous wave signal. Also known as Morse code.
Channel A group of preset parameters stored in permanent memory
associated with a transmit and receive frequency.
Squelch Audio derived, noise immune
Audio 500 mW into 16 ohm, 50 mW at 150 ohm,
0 dBm into 600 ohm
Antenna Tuning
Whip AT-271A/U and longwires (use LWA for wires longer
than 15m), fully automatic antenna tuning,
100-channel memory
Tune Time 1 to 3 seconds initial tune; 20 ms, memory mode for
preset channels (no RF output in memory tune mode)
Antenna Switching Tuner bypassed and 50 ohm port automatically
engaged when whip (or long wire) antenna removed.
Internal Options
1099ALE FED-STD-1045A ALE
PRC1099A-IP Internet protocol interface for 10Base-T Ethernet
TCP/IP connection
Characteristic Specification

1: Introduction
1-4 PRC1099A-MS
LSB Lower sideband. The information carrying band of frequencies
below the carrier frequency in SSB transmissions.
Scan group A preset group of ALE channels stored in memory to which the
radio scans or listens for incoming ALE calls. The ALE option
must be installed and turned on.
Squelch A radio function (syllabic squelch) that reduces background
noise to a received signal by turning off the speaker unless
audio (voice) is detected. This eliminates the noise between
syllables during normal voice audio.
USB Upper sideband. The information carrying band of frequencies
above the carrier frequency in SSB transmissions.
VSWR Voltage standing wave ratio. The ratio of peak voltage in the
standing wave to the minimum voltage. Standing waves are
stationary interference patterns inside the antenna feed line
formed by forward and reflected RF power.

PRC1099A-MS 2-1
Chapter 2: System Overview
This chapter provides an overview of the various PRC1099A’s operations
including frequency conversion, receive and transmit paths and control signals.
Chapter 3 through 14 provides detailed circuit descriptions of each board as
well as technical specifications and servicing data. Figure 2-2 on page 2-14
provides a system block diagram and Figure 2-3 on page 2-15 provides a wiring
diagram.
2.1 Frequency Conversion
The PRC1099A up-converts transmit signals from 1650 or 1647 kHz to
75 MHz IF and then down-coverts the 75 MHz IF to the selected channel
frequency (1.6 to 30 MHz). The receive signal is first up-converted from the
selected channel frequency to the 75 MHz IF and then down-converted to either
1650 or 1647 kHz IF modulated by the receive audio.
In transmit mode, the PRC1099A mixes the modulated 1650 or 1647 kHz IF
with the 73.35 MHz second LO to the first IF output at 75 MHz, the Direct
Digital Synthesizer (DDS) generates the first local oscillator (LO) frequency in
the range of 76.6 and 105 MHz in 1 Hz steps. The second conversion from
75 MHz to 1650 kHz requires a local oscillator frequency of 73.35 MHz.
The PRC1099A provides selectable USB/LSB operation using separate BFO
frequencies of 1650 and 1647 kHz, respectively. The synthesizer is
automatically offset by 3 kHz when the sidebands are switched however, there
is no change in the output frequency.

2: System Overview
2-2 PRC1099A-MS
2.2 DDS Synthesizer
The DDS synthesizer outputs two local oscillator frequencies and a beat
frequency oscillator (BFO) frequency that it derives from a single reference
oscillator. The first local oscillator frequency (LO1) is a variable output
ranging from 76.6 to 105 MHz in 1 Hz steps. The second local oscillator
(LO2) is a fixed output frequency is 73.35, and the BFO is either 1647 kHz
(LSB mode) or 1650 kHz (USB mode),
2.3 Processor Control
The processor controls the DDS synthesizer, display, antenna tuner and many
other functions using the firmware program stored in permanent read-only
memory (ROM). Programmable functions such as channel frequencies and
antenna tune information are stored in random access memory (RAM). A
lithium battery with a nominal life of ten years provides DC power backup for
the RAM.
The serial peripheral interface (SPI) bus delivers data and control signals to
the appropriate boards. The data is decoded on the individual boards. The
front panel controls also interface with the processor to control and configure
radio functions. The serial data extends to the Accessory connector to control
external accessories such as a RF power amplifier.
Figure 2-1 Frequency Conversion Plan
Receiver Input
1.6 to 30 MHz
Audio
Output
To final amplifier
1.6 to 30 MHz
Microphone
Input
Transmit Path
Receive Path
Low Pass
Filter
1.6 to 30 MHz
Mixer
Output
75 MHz
75 MHz
Crystal
Filter
Mixer
Output
1650 kHz
1650 kHz
Crystal
Filter
Product
Detector
Synthesizer
First Loop
76.6 to 105 MHz
in 1 Hz Increments
Low Pass
Filter
1.6 to 30 MHz
Mixer
Output
1.6 to 30 MHz
75 MHz
Crystal
Filter
Mixer
Output
75 MHz
1650 kHz
Crystal
Filter
Balanced
Modulator
Synthesizer
Second Loop
73.35 MHz
BFO
1650 KHz USB
1647 KHz LSB