Acom 700S User manual

ACOM 700S
1.8-54 MHz
Linear Amplifier
User's Manual
Installation, Operation
and Maintenance
May 2021
OUTSTANDING HF POWER PRODUCTS

User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
Page 2 of 52 | S e c t i o n ABOUT DOCUMENTATION
May 2021
This manual is for electronic distribution mainly.
If you have it on paper and you no longer need it, please, recycle it!
The latest versions of our User's Manuals are available at
www.acom-bg.com

User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
May 2021
S e c t i o n ABOUT DOCUMENTATION | Page 3 of 52
ABOUT DOCUMENTATION
All ACOM documentation (including manuals, brochures, specifications, descriptions, presentations, video
materials, etc.) are based on the latest available information at the time of creation of our documents.
As we always strive to constantly improve and update our products, ALL PRODUCTS, PRODUCT
SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE. ACOM reserves the right to make changes and
improvements at any time without further notice or obligation to notify any person or organization of such
revisions or changes, made in order to improve the reliability, function, quality and design, and/or
performance of the ACOM products and services.
Further, this User's Manual is provided AS IS and ACOM shall not be liable for possible errors contained
herein.
This manual supersedes all previous editions, which thereby become invalid.
The cover images used in the manual are illustrative only.
We are continuously striving to improve our documentation, but nobody is perfect.
And our documentation is not an exception of this rule.
Have you found any errors or would you like to suggest changes in our documentation?
Please help us by sending your suggestions to the following e-mail address:
[e-mail]
The latest versions of our User's Manuals are available at
www.acom-bg.com
We highly recommend you to use this manual in electronic form as PDF-file instead of printed version. The
PDF-file is easy to read on any computer, tablet, smart phone or other similar device. In the PDF file you will
find the necessary information very fast due to context-oriented links (marked in orange) inside the file,
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PDF readers.

User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
Page 4 of 52 | S e c t i o n ABOUT DOCUMENTATION
May 2021
Title of Documentation
ACOM 700S 1.8-54 MHz Linear Amplifier
User's Manual
Installation, Operation and Maintenance
Type of Documentation
User's Manual
Purpose of Documentation
This manual explains Installation, Operation and Maintenance of the
ACOM 700S 1.8-54 MHz Linear Amplifier.
Record of Revisions
Description
Release Date
Notes
ACOM 700S User's Manual
-
First edition
ACOM 700S User's Manual
-
Second edition
ACOM 700S User's Manual
17.12.2019
Third edition
ACOM 700S User's Manual
31.05.2021
Fourth edition, R01
Validity
The specified data is for product description purposes only and may not be
deemed to be guaranteed unless expressly confirmed in the contract. All
rights are reserved with respect to the content of this manual and the
availability of the product.
Copyrights
© 2021 ACOM Ltd.
Copying this document, giving it to others and the use or communication
of the contents thereof without express authority, are forbidden.
Offenders will be held liable for infringement of any intellectual property
of ACOM Ltd. and all damages which may rise as a result.
Published by
ACOM Ltd.
Bulgaria | Bozhurishte 2227
Sofia-Bozhurishte Economic Zone | 6 Valeri Petrov Str.
GPS coordinates: 42.748616о| 23.209801о
Web: www.acom-bg.com
E-mail: [e-mail]
Note
This manual has been printed on chlorine-free bleached paper.

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May 2021
S e c t i o n ABOUT DOCUMENTATION | Page 5 of 52
Contents
ABOUT DOCUMENTATION ................................................................................................................................ 3
1. GENERAL INFORMATION........................................................................................................................... 8
1.1. Introduction and Description.......................................................................................................... 8
1.2. Owner Assistance............................................................................................................................ 8
1.3. Equipment Supplied........................................................................................................................ 8
1.4. Features........................................................................................................................................... 9
1.5. Safety Considerations, Explicit Definitions.................................................................................... 10
2. INSTALLATION.......................................................................................................................................... 13
2.1. Unpacking and Initial Inspection................................................................................................... 13
2.2. Amplifier Location Selection ......................................................................................................... 13
2.3. Connections................................................................................................................................... 14
2.4. Connecting to External Devices (transceiver, computer, etc.) and User Settings ........................ 18
3. FIRST POWER-ON, CONTROL SYSTEM, AND INITIAL CHECK.................................................................... 20
3.1. Low Energy Standby Mode of the Power Supply.......................................................................... 20
3.2. Front Panel.................................................................................................................................... 20
3.3. Initial Turning On........................................................................................................................... 21
3.4. Basic Screen................................................................................................................................... 21
3.5. Control System - Buttons and Menus ........................................................................................... 23
3.6. Test transmission .......................................................................................................................... 23
4. OPERATION.............................................................................................................................................. 27
4.1. Change of Modes RX/TX and Operate/Stand-by; AUTO OPERATE user setting ........................... 27
4.2. Band Change, Standard and Expanded Frequency Coverage ....................................................... 28
4.3. Operation with an External Antenna Tuner.................................................................................. 29
4.4. Automatic Protection System ....................................................................................................... 30
5. MENUS - SETTINGS AND OPTIONS .......................................................................................................... 32
5.1. Menu AMP MEASURE (Amplifier measurements)........................................................................ 33
5.2. Menu AMP SERVICE (Amplifier Service Functions)....................................................................... 34
5.3. Menu CAT/AUX SETTINGS (Selection of CAT/AUX interface) ....................................................... 35
5.4. Menu USER PREFERENCES ............................................................................................................ 37
5.5. Menu FAULTS LOG ........................................................................................................................ 38
5.6. Menu RESTORE DEFAULT SETTINGS.............................................................................................. 39

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Page 6 of 52 | S e c t i o n ABOUT DOCUMENTATION
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6. REMOTE CONTROL .................................................................................................................................. 40
6.1. Remote Control via ACOM eBox ................................................................................................... 40
6.2. Remote Control via RS-232 interface............................................................................................ 40
7. MAINTENANCE ........................................................................................................................................ 41
7.1. Periodic Maintenance ................................................................................................................... 41
7.2. Cleaning......................................................................................................................................... 42
7.3. Fuse Replacement......................................................................................................................... 42
7.4. Using the Fault Codes (signatures) for Diagnostics....................................................................... 44
7.5. Firmware Updates......................................................................................................................... 45
8. SPECIFICATIONS....................................................................................................................................... 46
8.1. Parameters.................................................................................................................................... 46
8.2. Functions....................................................................................................................................... 47
8.3. Storage and Shipment................................................................................................................... 48
8.3.1. Storage Environment....................................................................................................... 48
8.3.2. Shipping Size and Weight ................................................................................................ 48
8.3.3. Transportation................................................................................................................. 48
8.3.4. Returning to the Service Provider ................................................................................... 48
8.4. Information on Disposing and Recycling of Old Electrical and Electronic Equipment.................. 49
NOTES.............................................................................................................................................................. 50
Figures
Figure 2-1 Rear panel - Connections ............................................................................................................... 15
Figure 3-1 Front panel - Controls and Readouts ............................................................................................. 21
Figure 3-2 Basic screen.................................................................................................................................... 22
Figure 4-1 ACOM 04AT Remote Automatic Antenna Tuner and Switch......................................................... 29
Figure 4-2 Appearance of an alarm message .................................................................................................. 30
Figure 5-1 MENU SELECTION........................................................................................................................... 32
Figure 5-2 Menu AMP MEASURE..................................................................................................................... 33
Figure 5-3 Menu AMP SERVICE ....................................................................................................................... 34
Figure 5-4 Menu CAT/AUX SETTINGS.............................................................................................................. 35
Figure 5-5 Menu USER PREFERENCES ............................................................................................................. 37
Figure 5-6 Menu FAULTS LOG ......................................................................................................................... 38

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May 2021
S e c t i o n ABOUT DOCUMENTATION | Page 7 of 52
Figure 5-7 Menu RESTORE DEFAULT SETTINGS............................................................................................... 39
Figure 6-1 ACOM eBox Ethernet Remote Control device ............................................................................... 40
Figure 8-1 Packaging cardboard box ............................................................................................................... 48
Tables
Table 2-1 Signals and pin out of the CAT/AUX connector............................................................................... 18
Table 2-2 Signals and pin out of the RS-232 connector .................................................................................. 19
Table 5-1 Transceiver interface....................................................................................................................... 36

User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
Page 8 of 52 | S e c t i o n GENERAL INFORMATION
May 2021
1. GENERAL INFORMATION
Congratulations on purchasing one of the finest HF amplifiers in the world today.
ACOM is pleased that you have chosen one of our products, and we will endeavor to provide you with the
information and support you need to enjoy your purchase for many years.
We urge you to read all of the following materials before you embark on operating your new amplifier.
1.1. Introduction and Description
This manual explains:
•Installation
•Operation and
•Maintenance
of the ACOM 700S HF + 6 m solid-state linear power amplifier.
The ACOM 04AT Remote Automatic Antenna Tuner and Switch is designed to work with
our transistor (solid state) amplifier series, including the ACOM 700S (see Section 4.3
Operation with an External Antenna Tuner).
Remote control of ACOM 700S is provided by ACOM eBox Ethernet Remote control device
or RS-232 port (see Section 6 REMOTE CONTROL).
1.2. Owner Assistance
If assistance is needed, you should contact your local dealerfirst. If necessary, your dealer will contact ACOM
for additional guidance.
If you still have an issue you need to discuss with one of ACOM's specialists, the contact information is as
follows:
ACOM Ltd.
E-mail: [e-mail]
Bulgaria | Bozhurishte 2227
Sofia-Bozhurishte Economic Zone | 6 Valeri Petrov Str.
GPS coordinates: 42.748616о| 23.209801о
1.3. Equipment Supplied
The ACOM 700S amplifier and this User's Manual are shipped in a cardboard carton.

User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
May 2021
S e c t i o n GENERAL INFORMATION | Page 9 of 52
1.4. Features
•5" high resolution color display (108x65 mm), 800x480 pixels, and 24-bit color.
•The ACOM 700S amplifier uses a rugged LDMOS transistor.
•Compatible with all transceiver models available on the market - does not need any special signals:
"ground on transmit" and less than 40 W of RF drive power is sufficient.
•Broadband input circuit, providing a perfect transceiver load with SWR below 1.2:1 (typically 1.1:1),
without retuning throughout the whole frequency range from 1.8 to 54 MHz.
•The overall operation of ACOM 700S is extremely simplified: the screen menus are intuitive and easy
to follow, no special skill is required from the operator when changing frequency bands.
•Automatic control - when connected to a transceiver with CAT capability, the amplifier will track the
operating frequency, and will change bands accordingly.
•Even if not CAT connected, the amplifier monitors the input signal frequency through the built-in
frequency counter and automatically switches bands.
•Remotely controlled by RS-232 port and via Internet by the ACOM eBox Ethernet Remote Control
device.
•Takes care of itself via continuously working protection circuits in all modes.
•The operator can monitor numerically more than 10 parameters of the amplifier in operation.
•Easy maintenance - detailed data (55 parameters) about each of the last 28 hard-fault protection trips
is stored in the amplifier's non-volatile memory.
•Convenient for expeditions and field operation due to the extremely compact and lightweight
construction and the built-in switching-mode power supply (SMPS).
•SMPS operates with extended mains voltage range of 100-240 VAC, with no internal switch over. The
consumed current is purely sinusoidal, Power Factor Corrected (PFC) and inrush limited. This makes
the operation from unstable mains and generators easy and trouble-free.
•Perfect electromagnetic compatibility (EMC) with both highly sensitive devices and the powerful
devices in the radio station (receivers, computers, other amplifiers) exceeding the standard EMC
requirements due to the used PFC and built-in radio-frequency filters.

User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
Page 10 of 52 | S e c t i o n GENERAL INFORMATION
May 2021
1.5. Safety Considerations, Explicit Definitions
The ACOM 700S linear amplifier is a Safety Class I unit regarding protection against electric shock. The third
grounding lead of its mains cord (which is colored yellow with two green stripes) and the ground stud on
the rear panel of the amplifier (marked GND, see Figure 2-1 Rear panel - Connections) must be connected to
the station's grounding system for safe operation.
The amplifier is designed to meet international safety standards and complies with CE safety and
electromagnetic compatibility requirements, as well as FCC regulations.
This User's Manual contains information, warnings (signal words Danger, Warning, Caution and Notice) and
instructions, related to hazards, that should be followed by the user in order to ensure safe operation and
to keep the amplifier in a safe working condition at all times.
The EXPLICIT DEFINITIONS described below apply to this User's Manual:
DANGER
These notes call attention to a procedure or instructions which, if not correctly
performed, will result in serious personal injuries and even death.
WARNING
These notes call attention to a procedure or instructions which, if not correctly
performed, could result in serious personal injuries and even death.
CAUTION
These notes call attention to a procedure or instructions which, if not correctly
performed, could result in minor or moderate personal injuries.
NOTICE
These notes call attention to a procedure or instructions which, if not correctly
performed, could result in property damage or equipment damage not exclusively to
the amplifier but also to connected equipment.

User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
May 2021
S e c t i o n GENERAL INFORMATION | Page 11 of 52
Information notes described below apply to this User's Manual:
These notes highlight operating procedures or practices that may improve equipment
reliability and/or personnel performance, or to emphasize a concept.
ORANGE TEXT as LINKS
marks all internal links in the document between Sections, Figures, Tables, etc. for your
convenience.
The safety instructions contained in this User's Manual feature specific signal words
(Danger, Warning, Caution or Notice) and, where required, a safety alert symbol, in
accordance with actual standards ISO 3864 or ANSI Z535.

User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
Page 12 of 52 | S e c t i o n GENERAL INFORMATION
May 2021
PRECAUTIONS:
DANGER
Both the mains voltage and the high DC voltage up to 500 V inside the ACOM 700S
amplifier are LETHAL!
For your safety, pull the amplifier power plug out of the mains wall outlet and WAIT AT
LEAST 3 minutes EACH TIME BEFORE you remove the cover of the amplifier.
DANGER
Never allow anyone, ESPECIALLY CHILDREN, to push or put anything into holes in the
case - this will cause electric shock. NEVER TOUCH AN ANTENNA or antenna insulators
during transmission or tuning - this may result in an electric shock or burn. NEVER
EXPOSE the amplifier to rain, snow or any liquids. AVOID placing the amplifier in
excessively dusty environments or in direct sunlight. DO NOT OBSTRUCT COOLING ducts
or vents. Keep a minimum clearance distance of 10 cm (4 inches) to any other devices or
objects.
WARNING
Do not undertake on your own repairs or changes in hardware or software of the
amplifier in order not to endanger your or other's health and life and not to damage the
amplifier and the equipment connected with it, not covered by warranty. The
manufacturer is not liable for another's actions and responsibility shall be assumed by
the doer.
WARNING
To avoid damage (not covered under warranty) read the Section 2 INSTALLATION of this
User's Manual carefully. If you have any doubts about the installation, operation or
safety of the amplifier, please consult your dealer.

User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
May 2021
S e c t i o n INSTALLATION | Page 13 of 52
2. INSTALLATION
2.1. Unpacking and Initial Inspection
Before you install your amplifier, thoroughly read this manual.
First, carefully inspect the cardboard carton and its contents for physical damage. ACOM
ships amplifiers in highly protected containers, but it cannot assure that mistreatment
by shippers will not occur. If damage is evident, notify your dealer immediately. Delay
may void the carrier's warranty.
Keep all packing materials for possible future amplifier shipment.
2.2. Amplifier Location Selection
CAUTION
The weight of the unit is about 13 kg, which should preferably be handled by two
persons.
Position the amplifier near the place where it will be used. You will need an easy access to the command
knobs and indicator's area, as well as to the rear panel cabling.
NOTICE
The ACOM 700S is forced air cooled. Keep a minimum clearance distance of 10 cm
(4 inches) to any other devices or objects.
The exhaust air can reach 65 oC (150 oF) and if the surrounding devices are sensitive to heating from outside
or use forced air cooling themselves, increase the distances accordingly.
NOTICE
Do not leave accidental paper, cloth or other lightweight pieces around and under the
amplifier. They may be drawn in by the cooling air stream and block the vents. This will
lead to overheating and accelerated material aging, not covered by the warranty.

User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
Page 14 of 52 | S e c t i o n INSTALLATION
May 2021
2.3. Connections
Please, see Figure 2-1 Rear panel - Connections.
Connection to your station must be accomplished in the order described below, before you apply mains
voltage to the amplifier.
Before you connect the amplifier to external grounding, you should advise with a
licensed electrician and confirm such kind of connection is allowed by your national and
local electrical code, safety rules, and regulations in force. Simultaneous connection to
the earth grounding and protective earth may be inadmissible or may fall under special
requirements in some countries!
DANGER
Never use the gas installation pipes for grounding. This can cause an EXPLOSION!
DANGER
Do not use the steam-heating or water-supply network pipes for grounding! You may
expose to dangerous voltage not only yourself but also other people using the same
installation.
WARNING
Note that the grounding system may have to withstand currents over 15 A with
insignificant voltage drop on it. Therefore, it may be necessary to improve it
considerably, i.e. to become less resistive, with heavier leads and lower-resistive ground
path. The grounding leads should be at least 4 mm²(AWG 11 or SWG 13).
a) GND stud
First, connect the wing-nut grounding stud of the amplifier (on the rear panel, marked GND) to the station's
grounding system (see Figure 2-1 Rear panel - Connections).
For details and recommendations on the grounding and RF counterpoise system concerning the
electromagnetic compatibility see also Section 3.6.f) Elimination of electromagnetic compatibility (EMC)
problems.

User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
May 2021
S e c t i o n INSTALLATION | Page 15 of 52
Figure 2-1 Rear panel - Connections
b) KEY-IN socket
Amplifier input for receive/transmit control from the transceiver.
The transceiver switches the amplifier from receive mode into transmit mode (RX/TX) by grounding of the
KEY-IN input.
Run a shielded cable from the "ground on transmit" socket or terminal on your transceiver to the amplifier
rear panel KEY-IN socket. The KEY-IN socket uses a standard RCA phono plug.
Voltage on the KEY-IN jack does not exceed 12 V and the current is below 6 mA (see
Section 8.2.a) Receive / transmit control).
Your amplifier will not work if KEY-IN input is not connected properly.
Transceiver producers give different names to this output and they are for instance
TX-GND, SEND, T/R-LINE, PTT, etc. Some transceivers require that "ground on transmit"
is implemented via a software command, or by changing the setting of a switch on the
rear panel, or interior of the transceiver. Check your transceiver's manual.
d
a
e
1
f
g
2
3
4
c
b

User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
Page 16 of 52 | S e c t i o n INSTALLATION
May 2021
c) KEY-OUT socket
Transmit-enabling control output from amplifier to the transceiver.
The KEY-OUT socket on the rear panel provides an extra control signal from the amplifier to the
transceiver. It can be used for improving the receive/transmit (RX/TX) switching safety.
NOTICE
KEY-OUT is a low-powered open-collector output, make sure that the signal voltage
coming from the respective transceiver connection does not exceed 50 VDC (open
circuit) and the closed-circuit current is below 20 mA.
If your transceiver has a suitable input that disables transmission unless grounded externally, we
recommend that you connect it with a shielded cable terminated in a Phono (RCA) connector to the
KEY-OUT socket of the amplifier.
ACOM 700S will operate normally with KEY-OUT unconnected if your transceiver has no
such input.
Transceiver producers give different names to this input and they are for instance
TX-INHIBIT, MUTE, LINEAR, etc. Check your transceiver's manual.
d) RF INPUT
Connect a suitable coaxial cable from the transceiver output to the amplifier RF INPUT SO-239 socket (on
the rear panel), using PL-259 plug.
NOTICE
In order to avoid a damage, turn off your transceiver's internal antenna tuner.
e) RF OUTPUT
NOTICE
If this is the first time you will use a power amplifier in your station, pay attention to the
coaxial cable type from the amplifier's output to the antenna. It must handle the
increased power safely, particularly on the 10- and 6 meters bands. We recommend that
you use RG213 cable or better. Check the same for the antenna switch and tuner, as
well as the whole antenna system (especially multi-band trap antennas).
Connect a suitable coaxial cable with a PL-259 plug from the RF OUTPUT (on the rear panel) to the antenna
switch or tuner, or to antenna for the respective frequency band.

User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
May 2021
S e c t i o n INSTALLATION | Page 17 of 52
f) Main fuses
NOTICE
Make sure you check whether the main fuses installed in your amplifier (see Figure 2-1
Rear panel - Connections (f)) correspond to your local mains nominal voltage and if
necessary, replace them as described in Section 7.3 Fuse Replacement!
g) Power cord
Due to the different standards in different countries, the mains plug is supplied and mounted by the dealer.
He connects to the mains cord end a standard mains supply plug which meets the Safety Class I unit
standard in your country. The ground lead of the amplifier's power cord is colored yellow with two green
stripes and the blue and brown leads are active. When the amplifier is to be used with only one mains fuse,
it is connected in series with the brown lead, which must be the active. If you have any doubts about the
correct way of connecting the wires, consult your dealer.
h) Preparation of wall outlet
for the amplifier, requirements for the electrical wiring and the mains voltage.
WARNING
Before connecting the amplifier to your mains supply using a licensed electrician, check
that the supply is correctly wired, and is adequate for the current drawn by the amplifier
(up to 10 A from 200/240 VAC mains and up to 16 A from 100/120 VAC mains). Make
certain that the grounding lead is connected properly and that it has a cross section not
less than the cross section of the phase conductor in the wall outlet for the amplifier.
It is preferable that you use the wall outlet closest to the source. The installation leads should be at least
1.5 mm² (AWG 15 or SWG 17) at operating 200-240VAC and 2.5 mm² (AWG 13 or SWG 15) at 100-120VAC
(recommended values if there are no stricter requirements by your local standard). Check that the panel
fuse has a free capacity for the additional load from the amplifier as specified in Section Specifications 8.1.h)
Mains Power Consumption at Full Output Power. If you connect the amplifier to a different mains outlet, be
sure that you check it, too.
Make sure the main Power Switch (marked "ON/OFF", see Figure 2-1 Rear panel - Connections, 2), on the rear
panel is in OFF position and insert amplifier's mains plug into the wall outlet prepared for it. The amplifier
remains switched off.

User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
Page 18 of 52 | S e c t i o n INSTALLATION
May 2021
2.4. Connecting to External Devices (transceiver, computer, etc.) and User Settings
a) CAT/AUX interface
Please, see Figure 2-1 Rear panel - Connections (3).
CAT/AUX interface is used for connecting and operating with various transceiver models (see Table 2-1
Signals and pin out of the CAT/AUX connector below and the respective menu in Section 5.3 Menu CAT/AUX
SETTINGS (Selection of CAT/AUX interface), Table 5-1 Transceiver interface and Figure 5-4 Menu CAT/AUX
SETTINGS).
Most of the modern transceivers can be connected by CAT to the ACOM 700S. This will allow the amplifier
to track the transceiver frequency without any transmission and change the bands automatically when in
Operate mode. The cable can be supplied optionally, ordered separately or home brewed according to
Table 2-1 Signals and pin out of the CAT/AUX connector and the transceiver's manual.
The CAT connection requires a cable made especially for the ACOM 700S and your transceiver. If you need
cable wiring diagrams, Please, contact your dealer (see Section 1.2 Owner Assistance).
Note that some of the connections - to the transceiver's BCD band data outputs and
Band Voltage outputs do not provide an exact frequency data, but only band data. Those
connections cannot be used when ACOM 700S works together with ACOM 04AT
because the tuner needs to know the exact frequency, not only the band.
CAT/AUX
interface
Pin Nr.
Pin name
Description
Specification
D-sub
connector,
15-pin,
3-row,
female
(Rear panel
view)
1
RxD
Receive Data
TTL input
2
RxD
Receive Data
RS-232 input
3
TxD
Transmit Data
RS-232 output
4
TxD
Transmit Data
TTL output
5
GND
Ground
0 Volt
6
BAND voltage
Analogue input
0 to +8 V
7
Band data 0
Bit 0
TTL input
8
Band data 1
Bit 1
TTL input
9
Band data 2
Bit 2
TTL input
10
Band data 3
Bit 3
TTL input
11
ON RMT
Remote Pwr On
+4.5 to +15 V / 3 mA max
12
Debug mode
CPU only Pwr input
+8 to +15 V / 0.4 A
13
KEY - IN
Tx request
Less than +12 V / 6m A
14
KEY - OUT
Tx Ready
O.C. output, up to +50 V / 20 mA
15
GND
Ground
0 Volt
Table 2-1 Signals and pin out of the CAT/AUX connector

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May 2021
S e c t i o n INSTALLATION | Page 19 of 52
b) RS-232 connector
Please, see Figure 2-1 Rear panel - Connections (4).
This connector may remain unused until you decide to control the amplifier remotely.
Please, see Section 6.1 Remote Control via ACOM eBox.
RS-232
interface
Pin Nr.
Pin name
Description
Specification
D-sub
connector,
9-pin,
female
(Rear panel
view)
1
-
Not connected
-
2
TxD
Transmit Data
RS-232 level output
3
RxD
Receive Data
RS-232 level input
4
-
Not connected
-
5
GND
Ground
0 Volt
6
DSR
Remote Power On
RS-232 level input
7
-
Not connected
-
8
CTS
Remote Power On
RS-232 level input
9
-
Not connected
-
Table 2-2 Signals and pin out of the RS-232 connector

User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
Page 20 of 52 | S e c t i o n FIRST POWER-ON, CONTROL SYSTEM, AND INITIAL CHECK
May 2021
3. FIRST POWER-ON, CONTROL SYSTEM, AND INITIAL CHECK
NOTICE
Do not turn the amplifier on for at least 2 hours after unpacking it in the room where it
will be used. Pay particular attention when you move it from a very cold into a warm
place - condensation is likely and this could result in damage to the high voltage circuits.
In such a case, wait at least 4 hours. A similar effect can occur after a rapid warming of
the operating room (for instance after switching on a powerful heater in a cold shack).
After following all instructions in Section 2 INSTALLATION, check whether the rear panel mains switch
(marked "ON/OFF") is turned off (see Figure 2-1 Rear panel - Connections (1)). Then insert amplifier's mains
plug into the wall outlet prepared for it.
3.1. Low Energy Standby Mode of the Power Supply
Now you can turn on the mains switch (marked "ON/OFF") on the rear panel. This will activate only the
low-energy stand-by mode of the amplifier power supply and the red LED above POWER button will light up
(see Figure 3-1 Front panel - Controls and Readouts (b)), while the main power supply is still off and the display
is dark.
3.2. Front Panel
Please, see Figure 3-1 Front panel - Controls and Readouts.
a) POWER button
When the rear panel mains switch is turned on, push and hold for 1-2 seconds to start the amplifier up.
When the amplifier is turned on, push to turn it off (back to Low Energy standby mode).
b) LED indicator above the POWER button
When lit red and the screen is dark, the amplifier is in Low Energy standby mode and may be turned on by
pushing the POWER button.
c) Functional buttons
Six functional buttons keypad for manual (local) control of the amplifier. The function of each button is
indicated on the display above it. Depending on the displayed menu, the buttons may have different
functions (soft key).
d) A high resolution, 24-bit color display showing the operating information.