Datron MT-1099A User manual

MT-1099A
Mobile Mount
Operator/Technical Manual
Manual Part No. MT-1099A-MS
Release Date: February 2007
Revision: C

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

MT1099A-MS i
Change Description
Date of
Revision
Revision
Letter Description of Changes Pages Affected
02/07 C Update format and content. All

MT1099A-MS iii
© 2003 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, is subject to change without notice, and 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
mean 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 there-
fore, 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, nontrans-
ferable 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 war-
ranty that covers the media upon which the Software is embed-
ded 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.
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 EXPRESS OR
IMPLIED, ARE MADE WITH RESPECT TO THE
EQUIPMENT OR THE PARTS CONTAINED

iv MT1099A-MS
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 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 the Technical
Support Services. Datron World Communications Inc.,
3030 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 “Parts Replacement”
Datron World Communications Inc., 3030 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.
1/95
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 be 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 ground-
ing.
Servicing: Trained personnel should only carry out servicing.
To avoid electric shock, DO NOT open the case
unless qualified to do so.
Various measurements and adjustments described in this man-
ual are performed in ac power applied and the protective
covers removed. Capacitors (particularly the
large power supply electrolytics) 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

MT1099A-MS v
CONTENTS
Chapter 1: Introduction
1.1 MT-1099A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.2 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Chapter 2: Installation
2.1 Mounting Template . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Figure 2-1. MT-1099A Mounting Template (Top View) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.2 Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.3 System Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Figure 2-2. 24 Vdc 20W Mobile System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Figure 2-3. 24 Vdc 100W Mobile System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Figure 2-4. 24 Vdc 400W Mobile System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Chapter 3: Operation
Figure 3-1. MT-1099A Front and Rear Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Table 3-1. Connector/Switches Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Table 3-2. Front Panel Power Switch Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Chapter 4: Technical Description
4.1 Circuit Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Figure 4-1. Configuration Jumper Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Table 4-1. 28 Vdc Regulator Module Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.2 Connector Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Figure 4-2. Transceiver Connector J1 Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Figure 4-3. Amp Control Connector J2 Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Figure 4-4. Tuner Control Connector J3 Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Figure 4-5. DC Out Connector J4 Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Figure 4-6. DC In Connector J5 Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
4.3 Component Locations, Schematics and Parts Lists . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Figure 4-7. Amplifier Board Components Location (738301 Rev. E) . . . . . . . . . . . . . . . . . . . . 4-8
Figure 4-8. Amplifier Board Schematic Diagram (994048 Rev. J). . . . . . . . . . . . . . . . . . . . . . . 4-9
Table 4-1. Amplifier Board Parts List (MT1099AMP Rev. L) . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Figure 4-9. MT-1099A-12 Schematic Diagram (994005 Rev. J) . . . . . . . . . . . . . . . . . . . . . . . 4-13
Table 4-2. MT-1099A-12 Parts List (MT1099BX12 Rev. S) . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
Figure 4-10.MT-1099A-24 Schematic Diagram (994006 Rev. J) . . . . . . . . . . . . . . . . . . . . . . . 4-17
Table 4-3. MT-1099A-24 Parts List (MT1099BX24 Rev. S) . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Figure 4-11.28 Vdc Regulator Board M8A Components Location (735138 Rev. G) . . . . . . . . 4-20
Figure 4-12.28 Vdc Regulator Board M8A Schematic Diagram (990840 Rev. G) . . . . . . . . . . 4-21
Table 4-4. 28 Vdc Regulator Board M8A (TW100-M8A Rev. N) . . . . . . . . . . . . . . . . . . . . . 4-23

MT1099A-MS 1-1
CHAPTER 1
INTRODUCTION
1.1 MT-1099A
The MT-1099A is a vehicular mobile mount that supports both the PRC1099
and PRC1099A transceivers (PRC1099/A). The MT-1099A can accommodate
an external RF amplifier and external antenna tuner and is available in either
12 or 24 Vdc versions depending on the vehicle electrical system where the
MT-1099A is to be mounted. The MT-1099A includes a built-in external
speaker with volume control.
The MT-1099A provides the following features:
• 12 Vdc and 24 Vdc versions
• Configurable for PRC1099 or PRC1099A
• Built-in speaker with volume control
• External RF Amplifier and antenna tuner interfaces

1: Introduction
1-2 MT1099A-MS
1.2 Specifications
All specifications subject to change without notice or obligation.
Characteristic Description
Electrical
Input Power
MT-1099A-12
MT-1099A-24
12 to 15 Vdc negative ground.
22 to 32 Vdc negative ground.
Input Protection Power line conditioning and reverse polarity
protection.
Output Power
MT-1099A-12
MT-1099A-24
Unregulated 13.6 Vdc, nominal (12 to 15 Vdc)
Regulated 13.6 Vdc, 5A, Unregulated 28 Vdc,
nominal (20 to 32 Vdc).
Antenna Tuner Primary voltage and key lines provide control of
antenna tuner.
Radio Control Power and control interface to PRC1099/A
transceiver.
Loudspeaker Built-in, waterproof speaker. Front panel on/off
switch.
Mechanical
Weight 8 kg (17.5 lbs.).
Size (HWD) 15.37 cm x 41.91 cm x 30.48 cm (6.05 in. x
16.5 in. x 12.0 in.).
Environmental
Temperature
Operating
Storage
-30°C to +60°C (ambient).
-55°C to +85°C.
Shock
(Ballistic)
MIL-STD-901L, 1 blow with 400 lb. hammer, 5 ft.
in x, y, and z axis.
Vibration MIL-STD-810E, Method 514.3, Procedure 1,
Category 8 (ground mobile).
Drop MIL-STD-810E, Paragraph 5, Procedure 1
(functional shock).
Immersion MIL-STD-810E, Method 512.2, Paragraph 1 to
3.1, Procedure 1.

MT1099A-MS 2-1
CHAPTER 2
INSTALLATION
2.1 Mounting Template
The MT-1099A mounting hole pattern is identical to the standard military
mount, MT1029/VRC, and can be mounted wherever space permits.
2.2 Antennas
The MT-1099A supports the following antennas:
• MAR-16 antenna
• MAR-12 antenna
• MAR-16T antenna
• RA-MAS antenna
•AAW
Figure 2-1. MT-1099A Mounting Template (Top View)
1.03 Diameter hole
(5 places)
(11.000)
15.930
Front
(4.531)
12.000
all dimensions
in centimeters
(inches)
27.94
(40.46)
33.17
(30.48)
26.51
20.96
11.51
(0.406)
(8.250)
(13.046)
(10.438)

2: Installation
2-2 MT1099A-MS
The MAR-16 is a 4.8m (16 ft.) mobile antenna system that consists of a heavy
duty fiberglass military whip antenna with a flexible spring base and
mounting bracket. The MAR-16 can be tied down horizontally to support
NVIS communications. This antenna requires an antenna tuner.
The MAR-12 is identical to the MAR-16 except that it is 3.6m (12 ft.) in
length.
The MAR-16T is identical to the MAR-16 except that it includes a tilt whip
adapter on a flexible spring base. The adapter enables the antenna to be locked
in four different positions.
The RA-MAS is a 4.8m (16 ft.) mobile antenna system that consists of a
heavy duty fiberglass military whip antenna with a rigid mobile base and a
mobile mounting bracket. This antenna requires an antenna tuner.
The AAW is a whip adapter and feed wire (C992102) for connecting the
RA-MAS, MAR-12 and MAR-16 antennas directly to the PRC1099/A front
panel antenna mount. This is used in transceiver-only 20W mobile systems.
The AAW is not required when the system includes an external antenna tuner.
2.3 System Configurations
The MT-1099A can be installed in multiple configurations:
• 12 or 24 Vdc 20W (MT-1099A-12/24)
• 12 or 24 Vdc 100W (MT-1099A-12/24)
• 24 Vdc 400W (MT-1099A-24)
Figures on the following pages show these configurations, components and
associated cabling. For each configuration, the PRC1099/A includes the
battery case installed without the BB-LA6 battery in the battery case.
CAUTION: The following installations require the operator to
remove the protective cap from the PRC1099/A’s accessory con-
nector. Make sure the protective cap is attached to the PRC1099/A
front panel by a cord so it does not get lost. The protective cap
contains an internal jumper that completes the 12V path to the
radio when using battery power.
If the PRC1099/A needs to be converted from a mobile or fixed
base to a manpack configuration with the BB-LA6 battery
installed, the radio must have the protective cap in place to oper-
ate.
When the PRC1099/A is installed in the MT-1099A, the MT-1099A
provides the +12 Vdc supply to the PRC1099/A through the
C991949 cable.

2: Installation
MT1099A-MS 2-3
2.3.1
24 Vdc 20W
Mobile System
The 24 Vdc 20W mobile system includes the following components:
• MT-1099A-24 mobile mount
• PRC1099/A transceiver
• MAR-16T antenna (or equivalent)
• MHS military handset
• AAW whip adapter and feed wire (C992102 antenna cable)
• C991580 DC power cable
• C991949 transceiver power and control cable
2.3.2
12 Vdc 20W
Mobile System
The 12 Vdc 20W mobile system is identical to the 24 Vdc 20W mobile system
except that it uses the MT-1099A-12 instead of the MT-1099A-24. All other
equipment, cabling and connections are the same.
Figure 2-2. 24 Vdc 20W Mobile System
ANT
WHIP
TUNE
ANT
MHz KHz
OFF
LO
EXT AMP
MAN
CHANNEL
LITE
USB
LSB
SQUELCH
OPT
VOLUME
ACC
A
UDIO
010
5
5
6
7
8
9
1
2
3
4
STORE
HI
DIGIT TUNE
MT - 1099A-24
MAR - T
ANTENNA
16
J6
TO
24 V DC
P OWER
S OURCE
J5
C 991580
MHS
PRC 1099/
A
C 992102
DATA
TRANSCEIVER
VOICE
CALL
RADIO
INTERCOM
MONITOR
AMP CNTRL
INTERCOM
J8 J1
J2
VOLUME
PWR
ON
SPEAKER
ON
OFF

2: Installation
2-4 MT1099A-MS
2.3.3
24 Vdc 100W
Mobile System
The 24 Vdc 100W mobile system consists of the following components:
• MT-1099A-24 mobile mount
• PRC1099/A transceiver
• RA100-24 RF power amplifier
• RAT7000B 125W antenna tuner
• MAR-16T antenna (or equivalent)
• MHS military handset
• RA100-MM mounting bracket
• C991620 antenna cable (part of the RAT7000B antenna tuner)
• C991505 RF cable
Figure 2-3. 24 Vdc 100W Mobile System
C 991620 ( PART OF TUNER )
RAT B 7000
C 991505
C 991588
C 992301
C 991580
MAR - T
ANTENNA
16
TO
24 V DC
P OWER
S OURCE
AMP CNTRL
POWER
ON
SPEAKER
ON
J2
VOLUME
OFF
A
NT
WHIP
TUNE
ANT
MHz KHz
OFF
LO
EXT AMP
MAN
CHANNEL
LITE
USB
LSB
SQUELCH
OPT
VOLUME
ACC
AUDIO
010
5
5
6
7
8
9
1
2
3
4
STORE
HI
DIGIT TUNE
J4
A
MP CONTROL
RA 100-24
J1
RF INPUT POWER
OFF ON
C 991585
MT - 1099A-24
C 991575
C 991949
J1
RA - MM 100
PRC 1099/A
MHS

2: Installation
MT1099A-MS 2-5
• C991575 RF cable
• C991580 DC power cable
• C991585 power and control cable
• C991588 DC power cable
• C991949 power and control cable
• C992301 power and control cable
2.3.4
12 Vdc 100W
Mobile System
The 12 Vdc 100W mobile system is identical to the 24 Vdc 100W mobile
system except that it uses the MT-1099A-12 instead of the MT-1099A-24 and
the RA100-12 replaces the RA100-24. All other equipment, cabling and
connections are the same.
2.3.5
24 Vdc 400W
Mobile System
The 24 Vdc 400W mobile system consists of the following components:
• MT-1099A-24 mobile mount
• PRC1099/A transceiver
Figure 2-4. 24 Vdc 400W Mobile System
J7
RF INPUT
J1
RF OUTPUT
J2
DC OUT
J4 J5 J6
DC IN
J3
ATU CONTROL IN AMP CONTROLATU CONTROL OUT
C 991588
TO
24 V DC
P OWER
S OURCE
AMP CNTRL
PWR
ON
SPEAKER
ON
J2
VOLUME
OFF
A
NT
WHIP
TUNE
ANT
MHz KHz
OFF
LO
EXT AMP
MAN
CHANNEL
LITE
USB
LSB
SQUELCH
OPT
VOLUME
ACC
AUDIO
010
5
5
6
7
8
9
1
2
3
4
STORE
HI
DIGIT TUNE
PRC 1099A
MT - 1099A-24
C 991949
J1
MAR - T
ANTENNA
16
C 991645
C 992095
RA400-99 400W
RF AMPLIFIER
UNIV-SM
SHOCK MOUNT
RAT1000C
ANTENNA TUNER
J7
C 991505
C 991620
(
PART OF TUNER )
J6
J5
C 991614
C 992003
J3
MHS

2: Installation
2-6 MT1099A-MS
• RA400-99 RF power amplifier
• UNIV-SM universal shock mount for the RA400-99
• RAT1000C 1000W antenna tuner
• RAT1000-SM shock mount for the RAT1000C
• MAR-16T antenna (or equivalent)
• MHS military handset
• C991505 RF cable
• C991575 RF cable
• C991588 DC power cable
• C991614 DC power cable
• C991620 antenna cable (part of the RAT7000B antenna tuner)
• C991645 RF power cable
• C991949 power and control cable
• C992003 power and control cable
• C992095 power and control cable

MT1099A-MS 3-1
CHAPTER 3
OPERATION
To operate the MT-1099A:
1. Do one of the following:
• For 20W operation, install the MT-1099A according to section 2.3.1,
24 Vdc 20W Mobile System on page 2-3.
• For 100W operation, install the MT-1099A according to section
2.3.3, 24 Vdc 100W Mobile System on page 2-4.
• For 400W operation, install the MT-1099A according to section
2.3.5, 24 Vdc 400W Mobile System on page 2-5.
2. Turn the front panel switch to the POWER ON position to apply power to
the MT-1099A or to the SPEAKER ON position to also enable the built-in
external speaker. The POWER ON and SPEAKER ON positions also
provide power to the antenna tuner.
Note: The power present at the DC OUT connector to the external RF
amplifier (RA100, RA400) is not switched. When source power is con-
nected to the DC IN connector, it also present at the DC OUT connector
even when the front panel switch is in the OFF position.
Figure 3-1. MT-1099A Front and Rear Panels
J5
DC IN
J4 DC OUT
J3
TUNER CONTROL
VOLUME
VOLUME
ON
POWER
ON
OFF
TRANSCEIVER
J1
J2 AMP CNTRL

3: Operation
3-2 MT1099A-MS
The following table provides a description of the MT-1099A connectors and
switches.
The following table defines each of the front power switch S1 positions.
Table 3-1. Connector/Switches Description
Connector/Switch Description
J1 TRANSCEIVER Connects to transceiver ACC connector.
Provides power to the transceiver and
translates control and data signals between
the transceiver and the MT-1099A.
J2 AMP CNTRL Connects to an external amplifier (RA100,
RA400-99). Provides 12 Vdc to the external
RF power amplifier and translates control
and data signals between the MT-1099A and
the external amplifier.
J3 TUNER CONTROL Connects to antenna tuner (RAT7000B or
RAT1000C). Provides power to the antenna
tuner and translates control and data signals
between the MT-1099A and the antenna
tuner.
J4 DC OUT Connects to the RA100 (or RA400-99) RF
power amplifier. Provides 12 or 24 Vdc to
the RA100 or 24 Vdc to the RA400
amplifier.
J5 DC IN Input power connector (12 or 24 Vdc).
S1 Power switch Three pole switch turns DC power on and off
and turns on audio to built-in speaker.
Table 3-2. Front Panel Power Switch Positions
Setting Description
OFF Turns off DC power to the MT-1099A. Indirectly turns
off power to the transceiver, antenna tuner and built-in
speaker. The external amplifier (RA100) receives power
(12 or 24 Vdc) through the DC OUT J4 connector with
the power switch off.
POWER ON Turns on power to the MT-1099A. Also provides power
(12 Vdc) to the transceiver and antenna tuner. This
position does not provide audio to the built-in speaker.
SPEAKER ON Turns on power to the MT-1099A. Also provides power
(12 Vdc) to the transceiver and antenna tuner. This
position also provides audio to the built-in speaker.

MT1099A-MS 4-1
CHAPTER 4
TECHNICAL DESCRIPTION
4.1 Circuit Description
The MT-1099A mobile mount is available in two configurations according to
source voltages: +12 Vdc and +24 Vdc.
4.1.1
MT-1099A-12 The MT-1099A-12 receives input power (12 Vdc) through rear panel connector
J5 and routes it directly to the rear panel J4 connector to power the RA100-12
RF power amplifier for 100W applications. The MT-1099A also routes the
input voltage to the internal amplifier board where it passes through an LC π
filter consisting of C1, C2 and L1. Then the 12V line goes to the center pole on
the front panel power switch S1A. From the power switch, the input voltage
goes to internal connector J6. A jumper bridges J6 pin 1 to J6 pin 3. From J6 pin
3, the 12V line goes through another LC filter consisting of L2, C10 and
transient voltage suppression diode D3 on the amplifier board, then it goes to
the front panel TRANSCEIVER connector J1 to the PRC1099/A ACCESSORY
connector, the AMP CONTROL connector J2 and to the TUNER CONTROL
connector J3.
The MT-1099A provides a built-in external waterproof speaker for audio
received from the PRC1099/A through the front panel MT-1099A J1 connector.
The audio goes to the amplifier board which amplifies the audio using op amp
LM386 U1, then it routes the audio to the built-in external speaker. A front
panel VOLUME switch controls the speaker volume.
The PTT signal from the transceiver comes in through the front panel J1
connector, then goes to the amplifier board where it activates a switching relay
that shuts off the audio to the external speaker when an operator presses the
PTT button on the handset.
The MT-1099A includes a microcontroller that passes RS-232 serial
information between the PR1099A and the RA100 and RA400-99 RF power
amplifiers (clock and band selection data), and RAT1000C (channel data and
clock) or RAT7000B (channel data, clock and strobe) antenna tuners.

4: Technical Description
4-2 MT1099A-MS
A 10-jumper 3-pin jumper block on the amplifier board configures the
MT-1099A for either a PRC1099 or PRC1099/A. It also sets the baud rate for
the RS-232 transmission of data to the antenna tuners.
4.1.2
MT-1099A-24 The MT-1099A-24 operates the same way as the MT-1099A-12 except that it
includes the 28 Vdc M8A switching regulator board that converts +28 Vdc to
+12 Vdc up to a maximum current of 8A. The MT-1099A-24 provides 24 Vdc
for the RA100-24 while providing 12 Vdc for the antenna tuners and
amplifiers (the RA100-24 uses both 12 Vdc and 24 Vdc).
28 Vdc M8A
Voltage
Regulator Board
The 28 Vdc M8A voltage regulator board includes the MC34063 monolithic
switching regulator U1, configured as a step down voltage regulator. The
M8A also includes the thick film hybrid power output stage SM625, U2, that
consists of a high current Darlington transistor switch with a commutating
diode. The regulator circuit operates at about 75% efficiency and generates
little heat.
Resistors R1, R5 and R6 are current limiting resistors that limit the supply
output to 9A. Capacitor Q10 sets the operating frequency at approximately
50 kHz. Resistor R2 and R3 set the output voltage to 12.6 Vdc. The M8A
regulator circuit is a switching type regulator that uses a pulse width
modulator to control the output. The circuit includes an input LC filter
Figure 4-1. Configuration Jumper Block
Configuration Jumper Blocks
12345678910
Transceiver
PRC1099A AAAAA
PRC1099 BBBBB
Baud Rate
9600 B B
4800 B A
2400 A B
1200 A A
JU 1
A
B
12345
6
78
9
10