Page 1
ACOM 700S
1.8-54 MHz
Linear Amplifier
User's Manual
Installation, Operation
and Maintenance
OUTSTANDING HF POWER PRODUCTS
May 2021
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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
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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:
documentation@acom-bg.com
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,
including context-linked Table of Content.
To open PDF-files you can use any free PDF viewer, for example:
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PDF readers.
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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: documentation@acom-bg.com
Note
This manual has been printed on chlorine-free bleached paper.
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User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
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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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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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
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User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
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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 dealer first. 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: support@acom-bg.com
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.
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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.
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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.
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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.
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May 2021
PRECAUTIONS:
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.
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.
User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
DANGER
DANGER
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.
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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.
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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.
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S e c t i o n INSTALLATION | Page 15 of 52
d a e
1 f g
2 3 4
c
b
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.
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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.
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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.
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Page 18 of 52 | S e c t i o n INSTALLATION
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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
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.
Table 2-1 Signals and pin out of the CAT/AUX connector
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S e c t i o n INSTALLATION | Page 19 of 52
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
-
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.
Table 2-2 Signals and pin out of the RS-232 connector
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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.
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c a b
d
Figure 3-1 Front panel - Controls and Readouts
3.3. Initial Turning On
In order to start up the amplifier, push and hold the front panel POWER button for one or two seconds.
About ten seconds later (boot sequence) the display will flash and show the basic screen with the amplifier
information (see Figure 3-2 Basic screen).
The amplifier may start in either Stand-by or Operate mode depending on AUTO OPERATE user setting (see
Section 4.1.c) AUTO OPERATE user setting).
3.4. Basic Screen
Please, see Figure 3-2 Basic screen.
There are 9 different information areas on the basic screen:
a) Information area for the frequency band
The edges of the currently selected BAND are displayed. If the amplifier doesn't receive any operating
frequency data from CAT or via RS-232, it will switch to the last used band.
b) Operating values and alarm messages area
Any two operating values selected in the AMP MEASURE menu will be shown here (see Section 5.1 Menu
AMP MEASURE (Amplifier measurements)).
The alarm messages (either WARNING or SOFT FAULT) appear on yellow background on the same area and
are flashing frequently in order to attract the operator's attention (see Figure 4-2 Appearance of an alarm
message).
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d c b g e a f
i
h
1
2
Figure 3-2 Basic screen
The WARNING messages appear only temporarily (for about three seconds), afterwards the indication of
the operating values is restored automatically (see Section 4.4.a) The first protection level - WARNING).
The SOFT FAULT messages appear in the same field but they remain on the screen until the AUTO OPERATE
time is elapsed (see Section 4.1.c AUTO OPERATE user setting) or until the operator pushes any button, then
the operating values (regime measurands) indication is restored too.
c) Working mode indicator - OPR, STB or AUTO OPER
(See Section 4.1 Change of Modes RX/TX and Operate/Stand-by; AUTO OPERATE user setting)
d) RX/TX indicator
RX/TX indicator reads the request for transmit (KEY-IN input). The RX indication is green and the TX is red.
The indicator will flash frequently if switch over is impossible.
e) Forward power bar graph and digital readout
Displays the forward power fed into the antenna.
f) Reflected power bar graph and digital readout
Entering the red zone is not allowed.
g) PA transistor temperature bar graph and readout
Entering the red zone is not allowed.
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h) CAT interface information
When CAT is deactivated, this field is shaded.
i) REMOTE CONTROL information field - flashing represents RS-232 port dataflow.
3.5. Control System - Buttons and Menus
1) The OPR/STB and the BAND buttons are used for manual (local) control (see Figure 3-2 Basic
screen):
• The left-most button OPR/STB switches over the amplifier between Operate and
Stand-by modes;
• The next two buttons - BAND up and down arrows change the frequency bands in
ascending or descending order.
2) The right-most button MENU (see Figure 3-2 Basic screen) provides access to the amplifier's
settings and service functions:
• In each menu the left-most button is always HELP and the right-most - always EXIT;
• The HELP button provides information about the active screen.
For more details of the control system and use of the menus see Section 5 MENUS - SETTINGS AND OPTIONS.
3.6. Test transmission
To make sure that you have installed the amplifier correctly, make a test transmission as described below.
Repeat these tests for each new band and antenna, as well as after installing a new or modified antenna,
antenna switch, tuner, and/or connecting cables.
a) Check of RF bypass path of a non-driven amplifier
For this check the amplifier must be completely installed and connected according to Section
2 INSTALLATION, but not powered by the mains, i.e. the POWER ON switch on the rear panel must be turned
off. In any case the LED above the POWER button must be dark for this test.
First, check if the transceiver's reception is normal. If you observe a significant worsening of reception, first
check for a problem in the coaxial connections to the amplifier (see Sections 2.3.d) RF INPUT and 2.3.e) RF
OUTPUT). Be sure to connect to the amplifier output an antenna having good SWR in the band being tested.
Provided the reception is normal, prepare the transceiver as follows:
• Select a continuous carrier mode (CW, RTTY, FM);
• Switch the microphone off (decrease the mic gain), disable FSK;
• Reduce the output power control to a minimum;
• Select a suitable indication so that you can watch the RF power and SWR at the transceiver output;
• If the transceiver has a built-in antenna tuner - switch it off.
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Now in Receive mode select a frequency which is not occupied at the moment and press shortly the PTT or
TX key while watching the output power and the SWR readings. If the power or SWR at the transceiver
output are too high (over 5 W or SWR over 2:1) release the key and check for the reason as follows:
• Check again whether the power control is set at minimum;
• Check whether the frequency is within the operating range of the selected antenna;
• Check the good working order of the coaxial cables, connectors, and feed lines from the
transceiver antenna jack through the amplifier, the antenna switch or external tuner (if there
is one) to the BALUN transformer, and the antenna itself (see Section 2.3.e) RF OUTPUT).
If the power and SWR are as expected, transmit again and while watching the power and the SWR readings,
increase transceiver power gradually from minimum to maximum (but not more than 200 W in order to not
overload the RF by-pass circuit in the amplifier).
If SWR remains below 2:1 (preferably below 1.5:1) at the last test, decrease the power from the transceiver
to minimum again and continue with the next check-up.
b) Check-up in Stand-by mode
Turn the amplifier on, as described in Sections 3.1 Low Energy Standby Mode of the Power Supply, 3.2 Front
Panel, 3.3 Initial Turning On and 3.4 Basic Screen (see Figure 3-2 Basic screen).
Make sure that the amplifier is in Stand-by mode. Push the OPR/STB button if needed to change to STB.
Repeat receive and transmit tests the same way you just did with the amplifier turned off. During these
tests note also whether the forward and reflected power bar graph and digital readout (see Sections 3.4.e)
Forward power bar graph and digital readout and 3.4.f) Reflected power bar graph and digital readout) show
respective RF power presence. If the reflected power exceeds the forward power, verify that the input and
output coaxial cables to the amplifier are not interchanged (see Section 2.3.d) RF INPUT and 2.3.e) RF
OUTPUT).
The power indication accuracy is optimized around the 700 W level and usually it is
unreliable below 40 W.
c) Entering Operate mode
At Operate mode the transceiver receiving should not suffer. If it worsens and together with this the
indicator RX changes into TX although the transceiver is in receive mode, check the control cable connected
to the KEY-IN input (see Section 2.3.b) KEY-IN ) for a short circuit. A wrong connection to the transceiver
could cause the same problem.
d) Test transmission
If not readily set by CAT, switch the amplifier to the same band as the transceiver and antenna.
Set the transceiver to a continuous carrier mode and minimum power. In Operate mode choose a free
frequency and push the PTT or CW key briefly, while watching the amplifier's behavior:
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• RX mode must change to TX;
• The reflected power must read below 20 W;
• The forward power must read between 20 and 150 W with minimum drive power from the
transceiver (between 1 and 5 W).
If the above test goes normally, push briefly the PTT once again, this time watching the transceiver's SWR
reading (i.e. the input SWR of the amplifier) - this must be below 1.2:1.
e) Setting of drive level and typical operation
After successfully passing of the above tests push PTT or CW key for several seconds, watching the forward
and reflected power. Increase the drive power until the forward power bar graph and digital readout reach
700 W.
Upon reaching 700 W forward power check the following parameters (continuous carrier operation):
• The reflected power must not exceed
78 W (for SWR 2:1) or better still to be below 28 W
~
(for SWR 1.5:1);
• PA DC CURRENT must be between 23 and 30 A; it is normal that the current varies within
these limits when changing operating frequency and antenna impedance;
• PA DC VOLTAGE must be within 42-44 V;
• The transceiver's SWR reading must be below 1.2:1.
Enter the MEASURE menu (see Figure 5-2 Menu AMP MEASURE) and check:
• Тhe drive power from the transceiver must be between 22 W and 29 W;
• PA BIAS, which must be between 2.4 and 2.8 V;
• PA TEMPERATURE, which must be between the ambient and 95
o
C (203 oF), depending on the
power level and the duration of transmission.
f) Elimination of electromagnetic compatibility (EMC) problems
If you use an amplifier for the first time in your shack, you may need to make some improvements in the
setup. It is possible you might experience tingling from metallic objects due to the stronger radiated RF
field. It could affect the operation of your station or systems outside, if they are too sensitive - typical
examples are the microphone, CW keyer, computer keyboard or mouse, as well as TV receivers, Hi-Fi,
intercom or telephone setups and others.
For instance, induction of RF currents into the microphone, CW keyer or computer keyboard, may lead to
distortion in the peaks or relaxation oscillation in SSB mode, "sticking" or breaking off the dots or dashes
from a Morse keyer, or garbling computer screen images. For the elimination of such problems, we
recommend that you take the following general measures:
• Minimize the radiation from the feed lines by reducing the common mode currents in them,
improve the balance of antennas and feedlines;
• In case you use asymmetric antennas (GP and similar) install as many radials as practical (use
a well-developed counterpoise system);
• Add current chokes on the coaxial feeders;
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• Place as far away as possible (also by height) the radiating elements of antennas from the
premises, where the affected devices are located; in this sense, asymmetrical antennas
without a separate feeder (Long Wire, Windom, and similar) may cause more interference
because their radiating element begins immediately from the shack (part of it is the feeder
itself);
• If the use of asymmetrical directly fed "wire" antennas is inevitable, use mainly half wave or
half wave multiple - they have a high input impedance, operate respectively with a small
current in the feed point, and in the grounding of the shack; thus you can reduce the strength
of the disturbing RF fields more than 10 times (at the same radiated power) compared to the
case with quarter-wave and multiple to quarter-wave antennas of this class - you should
avoid them because they have a low input impedance and operate with a large RF current in
the grounding system and in the power supply network respectively, i.e. they create stronger
disturbances (RFI);
• Improve the RF grounding system: use the shortest and widest possible metal strips for the
connections to ground and between the different gear in the shack; connect one or more
counterpoises (sized for the problematic band) to the feeder shield at the point, where it
enters the building, and the same point - with the possibly shortest and widest connections to the grounding system: this is a very efficient measure, in particular if the shack is located
on a high floor above ground;
• To reduce the RF impedance of the grounding connections sheet metal stripes instead of
flexible braids are preferred;
• Thread ferrite beads or snap-in ferrites with medium permeability (800-4000) over the power
cord, the feeder and the signal cables leading to the affected devices (TV etc); besides the
size, consider the frequency range in which the offered ferrites are effective - normally they
are optimized for suppression of interferences on HF (with larger permeability), with medium
permeability for HF-VHF or with low permeability - only the VHF range. The latter are
ineffective for HF;
• Whenever possible use shielded cables and ground their shields at both ends;
• The addition of even quite simple low pass L/C or R/C filters directly to the disturbed inputs
or outputs of the devices is very effective, provided it is practically applicable.
Last but not least, bear in mind that the benefit of the above measures is two-fold.
Firstly - they reduce the interferences from your transmissions to the ambient environment and secondly they reduce the background noise floor for your reception.
Practically, with no great efforts, implementing the above measures, you can reduce the receive
background noise floor with one or more S-units across the different bands. This will allow you not to miss
weaker stations, which will hear you because of your increased transmission power.
And third, but very important: the EMI environment at your station will become safer for you and those
close to you.
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4. OPERATION
4.1. Change of Modes RX/TX and Operate/Stand-by; AUTO OPERATE user setting
a) Stand-by mode
In Stand-by mode, as well as when the amplifier is not powered, receiving and transmitting (no more than
200 W) with the transceiver is done via RF bypass between RF INPUT and RF OUTPUT of the amplifier. In
Standby, the transceiver's RF power is not amplified, the control KEY-IN input does not affect the operation,
and the KEY-OUT output (see Section 2.3.c) KEY-OUT socket) follows the KEY-IN input unconditionally. The
bands cannot be changed neither manually nor by CAT or remotely.
b) Operate mode
In Operate mode the receive-transmit (RX/TX) direction is controlled by the KEY-IN input:
• At open KEY-IN (Operate/RX mode), the transceiver receives the signals from the antenna
through the same RF by-pass path between RF INPUT and RF OUTPUT as with amplifier
turned off or in Stand-by mode;
• At grounded KEY-IN (Operate/TX mode) the RF drive is amplified and fed to the antenna
through the RF OUTPUT connector.
In order to provide time for the relays to switch safely from receive to transmit, the
transceiver should provide a dead time i.e. must "notify" the amplifier in due time by
grounding the control KEY IN input not later than 10 ms before feeding drive power
toward the amplifier RF input. Otherwise, the protection system will read "HOT
SWITCHING ATTEMPT" and will trip off.
In Operate mode the KEY OUT output (see Section 2.3.c) KEY-OUT socket) follows the KEY-IN input only after
all conditions for safe transmission have been found good by the amplifier control unit. The KEY OUT
output duly disables transmission while the amplifier is not ready.
The two modes Operate and Stand-by may be changed:
• Manually (locally) - by pressing the OPR/STB button alternatively (see Figure 3-2 Basic screen);
• Automatically at a SOFT FAULT protection trip - when the AUTO OPERATE user setting is
activated (see Section 5.4.c) AUTO OPERATE);
• By a remote control command.
Access to the Operate mode can be locked in the AMP SERVICE menu, the OPERATE
ACCESS user setting (see Section 5.2 Menu AMP SERVICE (Amplifier Service Functions) and
Figure 5-3 Menu AMP SERVICE).
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c) AUTO OPERATE user setting
AUTO OPERATE user setting can be turned on/off by the operator in the USER PREFERENCES menu (see
Section 5.4 Menu USER PREFERENCES and Figure 5-5 Menu USER PREFERENCES) or by a remote control
command.
When the AUTO OPERATE user setting is OFF, the two modes Operate and Stand-by can be changed
alternatively by the OPR/STB button or by a remote control command. At a SOFT FAULT protection trip, the
amplifier will revert to Stand-by and wait for the operator to return it to Operate by pressing the OPR/STB
button.
When AUTO OPERATE is ON (see Section 5.4 Menu USER PREFERENCES), the amplifier will start up in Operate
mode as soon as you turn it on. At a SOFT FAULT protection trip, the amplifier will also revert to Stand-by,
but will return automatically to Operate mode in about 4 seconds.
Even at AUTO OPERATE on, the operator can revert to and remain in a Stand-by mode manually by the
OPR/STB button or by a remote command. The next OPR/STB button push or remote command will switch
the amplifier to the Operate mode and restore the normal operation of the AUTO OPERATE user setting.
4.2. Band Change, Standard and Expanded Frequency Coverage
When connected to a transceiver with CAT, the amplifier will change frequency bands automatically,
following the transceiver's operating frequency changes.
Without CAT connection, the bands can be changed either manually or automatically (by the built-in
frequency counter).
The bands are changed manually by the up and down BAND buttons.
For an automatic band change via the built-in frequency counter, make a quite short pre-transmission
(100 ms is enough) - a CW dit, or a sound on SSB) and release the PTT for a moment before the main
transmission.
If the new frequency is out of the amplifier's frequency range (see Section 8.1.a) Standard Frequency
Coverage), the transmission request will be denied and the following fault message will appear on the
screen:
"FREQUENCY OUT OF RANGE"
The amplifier specifications are guaranteed within the bands listed in Section 8.1.a) Standard Frequency
Coverage. Frequency coverage changes could be negotiated with the manufacturer.
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4.3. Operation with an External Antenna Tuner
At antenna SWR over 1.5:1, it is advisable you use an external tuner.
The ACOM 04AT Remote Automatic Antenna Tuner and Switch (see Figure 4-1 ACOM 04AT Remote Automatic
Antenna Tuner and Switch) is designed to work with our transistor (solid state) amplifier series, including the
ACOM 700S.
It tunes antennas having SWR up to 3:1 automatically, thus providing an optimum load for the amplifier
within 5 seconds with improved harmonic suppression at that. The four-way antenna switch is controlled
automatically or from the amplifier front panel.
The ACOM 04AT can be installed both in the shack and in a remote location (even out in the open, close to
the antennas). It can be distanced up to 100 m (330 ft) from the amplifier, using a single coaxial cable.
The connection of ACOM 04AT will make accessible specific features on the amplifier display that provide a
transparent operation by following frequency and antenna selection changes in less than 50 ms. The
operation of ACOM 700S with ACOM 04AT is described in detail in the ACOM 04AT User's Manual (available
for download at www.acom-bg.com).
Use of other antenna tuners is not recommended.
Figure 4-1 ACOM 04AT Remote Automatic Antenna Tuner and Switch
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4.4. Automatic Protection System
The ACOM 700S control unit (see Section 7.4 Using the Fault Codes (signatures) for Diagnostics) keeps track of
most amplifier analogue and logic signals in all modes. Those are the receive/transmit control signal, the
output relay contact state and switching times, the RF drive frequency and drive power (the input power),
the final transistors DC current and DC voltage on the drains as well as, the gates bias voltage and the heat
sink temperature, the main power-supply components temperature, the RF output forward and reflected
power, and others. Some derivative parameters, as the power gain, the SWR, and others, are watched too.
In the event a parameter limit is violated, the amplifier will assess the risk and will trigger one of the three
levels of protection, as described in items (a) to (c) below. Every event is accompanied by a warning text on
the screen (see Figure 4-2 Appearance of an alarm message). A sound alarm will be also produced, if set on in
the "USER PREFERENCES" (see Figure 5-5 Menu USER PREFERENCES).
a) The first protection level - WARNING
The first (most forgiving) protection level is WARNING. When a value watched by the control unit
approaches the protection threshold, the transmission is not interrupted, but a message appears - for
example "Drive Power too High", "Drain Current too High", or another (see Figure 4-2 Appearance of an alarm
message).
You can continue to transmit in these conditions, but you have to take some measures, for example, to
reduce a bit the drive power from the transceiver. The warnings remain on the screen for at least three
seconds so that they can be read through and will disappear after the reason has dropped off.
Figure 4-2 Appearance of an alarm message
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b) The second protection level - SOFT FAULT
The second protection level is a SOFT FAULT - when a value exceeded the safe level, but does not put the
amplifier in a danger of a failure.
At the second level (SOFT FAULT) the amplifier reverts to Stand-by mode for four seconds or permanently
depending on whether the "AUTO OPERATE" user setting had been activated. A respective message is
shown on the screen, for example "Excessive Reflected Power", "Excessive Drain Current", and others,
accompanied by a sound alarm (unless the sound had not been muted - see Section 5.4 Menu USER
PREFERENCES).
Unlike those for a WARNING, the SOFT FAULT messages remain on the screen and persist until the operator
pushes any button - in order to confirm that the message is read - or until the OPERATE mode is resumed
automatically if the AUTO OPERATE user setting is active - see Section 5.4 Menu USER PREFERENCES).
A SOFT FAULT calls for fast and simple correcting actions by the operator, such as, for example, reducing
the drive power, improving of load SWR through retuning the antenna tuner, antenna change, etc.
c) The third protection level - HARD FAULT
The third and most serious protection level is a HARD FAULT. The amplifier will be turned off automatically
to avoid possible further damages.
When the protection trips off, the data about the fault is stored in the memory and the front panel screen
is blanked. There is also a sound alarm - a series of "F" sent in CW.
If the reason for tripping the protection is not obvious, you can try to turn on the amplifier. If the amplifier
allows this after the fault, a fault message will appear with information about the reason for the latest
automatic shutdown (for example, overheating of the power supply unit or of the PA stage).
After pushing any button, the fault message will disappear, and if there are no further problems (for
example, the overheated unit has already cooled down), the amplifier operation will be restored. In the
event a threshold is still violated, a new message will appear on the screen, or the protection will trip again
immediately after the recovery attempt.
If the problem persists, contact your dealer (see Section 1.2 Owner Assistance).
At each "HARD FAULT" shutdown the amplifier stores diagnostic data, concerning the controls and values,
the trip time, and others. Your dealer or his service may ask you to copy or take a picture on the data from
the amplifier screen or download it by RS-232 interface and store it in a computer file (see Section 5.5 Menu
FAULTS LOG).
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5. MENUS - SETTINGS AND OPTIONS
By pushing the MENU button (the rightmost on Figure 3-2 Basic screen) the user invokes the MENU
SELECTION screen (see Figure 5-1 MENU SELECTION). Each menu can be selected by the ITEM (up and down)
buttons and SELECT. These are described in Sections 5.1 through 5.6 below.
The items in each menu are selected and controlled by the same six buttons as in the basic screen, but they
have new functions now.
Figure 5-1 MENU SELECTION
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5.1. Menu AMP MEASURE (Amplifier measurements)
The menu AMP MEASURE (see Figure 5-2 Menu AMP MEASURE) is accessible from the MENU SELECTION
screen (see Figure 5-1 MENU SELECTION) in all modes. Here you can constantly observe the values of eleven
parameters.
Two identical lists appear on the left and the right halves of the screen, each one containing the same 11
values.
Any value can be selected in each screen half. Using buttons ITEM and ITEM (up and down) select the
desired values. The two selected values will appear also on the basic screen continuously (see field b) on
Figure 3-2 Basic screen) - after leaving this menu (EXIT button).
Figure 5-2 Menu AMP MEASURE
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5.2. Menu AMP SERVICE (Amplifier Service Functions)
The amplifier service menu (see Figure 5-3 Menu AMP SERVICE) is accessible from the MENU SELECTION
screen (see Figure 5-1 MENU SELECTION) at RX mode only.
NOTICE
The AMP SERVICE menu is used for checking and adjustment of the zero-signal (idle)
drain current of the final transistors and for testing some functions and circuits of the
amplifier when serviced. We recommend these procedures are carried out only by a
trained service technician!
The necessary service function is selected with the buttons ITEM and ITEM (up and down). With the
SELECT buttons (left or right) the selected function is turned ON or OFF.
The inactive functions are greyed out and the active are red. When leaving a function submenu, it is turned
off and deactivated automatically. At pressing the EXIT button all service functions are turned off, and the
MENU SELECTION screen comes back (see Figure 5-1 MENU SELECTION). At consecutive pushing of the EXIT
button, the basic screen returns (see Figure 3-2 Basic screen).
Figure 5-3 Menu AMP SERVICE
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5.3. Menu CAT/AUX SETTINGS (Selection of CAT/AUX interface)
After a CAT cable is connected to both the transceiver and amplifier, the correct settings for the transceiver
have to be entered via this menu. If there is no CAT connection, OFF has to be selected as Interface type.
The CAT settings are accessible only in RX mode (see Figure 5-1 MENU SELECTION and Figure 5-4 Menu
CAT/AUX SETTINGS). An item is selected by the ITEM buttons (up and down). Values are selected by the
SELECT buttons (left or right).
If the amplifier CAT port is connected either to the transceiver BCD Band Data or Band VOLTAGE output,
select the respective interface type and push EXIT. The other items and values will not be taken into
account.
If the CAT cable is plugged into the transceiver's serial port, select the interface and command set according
to Table 5-1 Transceiver interface. The baud rate has to be set to the same value as the transceiver's. The byte
spacing and polling time may be left unchanged.
Last select the interface type (RS-232 or TTL) according to the Table 5-1 Transceiver interface and used
connection, then push EXIT.
Figure 5-4 Menu CAT/AUX SETTINGS
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Tranceiver
Interface
Comm set
ELECRAFT
RS-232
5
ICOM (Connection to the REMOTE jack)
TTL
1
ICOM (Connection to the RS-232 port or CT17)
RS-232
1
KENWOOD TS-2000, 480, 590, 890, 990 and similar
RS-232
5
YAESU FT-101, 450, 950, 991, 1200, 2000, 3000, 5000, 9000 and similar
RS-232
2
YAESU FT-1000MP
RS-232
4
YAESU FT-817, 857, 897
TTL
3
Table 5-1 Transceiver interface
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5.4. Menu USER PREFERENCES
Figure 5-5 Menu USER PREFERENCES
a) ANTENNA TUNER/SWITCH INSTALLED
If ACOM 04AT remote automatic antenna tuner is installed, select YES. Refer to ACOM 04AT User's Manual
(available for download at www.acom-bg.com).
b) AUTOMATIC MENU EXIT
When AUTOMATIC MENU EXIT is turned on, the amplifier exits the currently selected menu if no button
has been pressed for more than 5 minutes.
If AUTOMATIC MENU EXIT is turned off, the amplifier remains in the currently selected menu until the EXIT
button is pushed.
c) AUTO OPERATE
The AUTO OPERATE user setting is described in Sections 3.3 Initial Turning On and 4.1.c) AUTO OPERATE user
setting.
d) CALL SIGN
If entered here, a call sign (or another text) will be included in any Fault Log file generated by the amplifier.
The call sign (or another text) will not replace ACOM 700S logo on the startup screen.
Use the SELECT button to select the character position. The ITEM button changes the characters. Finish by
moving the pointer out of the editable fields by means of the Left SELECT button.
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Page 38 of 52 | S e c t i o n MENUS - SETTINGS AND OPTIONS
May 2021
e) OPERATE ACCESS
When locked, the amplifier remains in Standby and cannot be switched to Operate unless unlocked in the
same menu. Passwords are not used – this is only a simple protection against possible child actions, or
involuntary switching to Operate mode. While locked, an attempt for entering Operate mode will result in a
message:
"OPERATE MODE IS LOCKED"
The other preference items don't need explanation.
5.5. Menu FAULTS LOG
This function reads on the screen the information stored in the memory about the last 28 HARD FAULT
protection trips (see Figure 5-6 Menu FAULTS LOG). By pushing the FILE button, the information may be also
downloaded in a plain-text format file through the RS-232 port and a computer using a standard terminal
emulating program (TTY). The RS-232 protocol settings are: 9600, 8 N 1.
Figure 5-6 Menu FAULTS LOG
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S e c t i o n MENUS - SETTINGS AND OPTIONS | Page 39 of 52
5.6. Menu RESTORE DEFAULT SETTINGS
Four different factory-reset levels are available (see Figure 5-7 Menu RESTORE DEFAULT SETTINGS).
In order to confirm the selected action, the operator must push the ACTION - left (YES) button once more.
After restoring the default settings, the control will return to the MENU SELECTION screen (see Figure 5-1
MENU SELECTION). If the ACTION - right (NO) button is pressed, the "NO" is selected again, and the control
will not leave the current position. At pressing the EXIT button in this position, the control leaves this menu
without changing anything and returns in the previous window (the MENU SELECTION screen - see Figure
5-1 MENU SELECTION).
Figure 5-7 Menu RESTORE DEFAULT SETTINGS
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Page 40 of 52 | S e c t i o n REMOTE CONTROL
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6. REMOTE CONTROL
6.1. Remote Control via ACOM eBox
Remote control of ACOM 700S via Internet is provided by the ACOM eBox Ethernet Remote Control device.
The operation of ACOM 700S with ACOM eBox is described in the ACOM eBox User's Manual (available for
download at www.acom-bg.com).
Use of other remote control devices is not recommended.
Figure 6-1 ACOM eBox Ethernet Remote Control device
6.2. Remote Control via RS-232 interface
The ACOM 700S may be controlled remotely by the RS-232 port.
For ACOM 700S RS-232 interface protocol, Please, contact your dealer (see Section
1.2 Owner Assistance).
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S e c t i o n MAINTENANCE | Page 41 of 52
7. MAINTENANCE
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.
7.1. Periodic Maintenance
a) Periodic checks
Periodically (but at least once per year) check all connections, contact cleanliness and the tightening of all
connectors, in particular the coaxial ones.
Check the integrity of the cables, in particular when they are laid on the floor. Check also if the cables are
secured well in the area where they come out of the connector body.
Pay particular attention to the mains plug and the wall outlet (see Sections 2.3.g) Power cord and 2.3.h)
Preparation of wall outlet. If you have any doubts consult with a qualified electrician.
Periodically check the SWR of the antennas and if this changes over time. Problems could occur more often
in poor weather conditions - rain, snow, strong wind etc.
b) Air filter
Periodically (more often in a dusty environment, but at least once per year) clean the air filter without
opening the amplifier.
CAUTION
The air filter may be too dusty - be careful how you clean it so that you DO NOT INHALE
(BREATHE IN) neither spill the dust over! Wrap it, for instance, in a wet cloth before
cleaning!
ACOM 700S has one air filter that is accessible from the rear - see Figure 2-1 Rear panel - Connections (2).
The filter is contained in an externally mounted plastic enclosure. The cover of the enclosure, together with
the filter itself, is removed by gently pulling it away from the amplifier. Carefully clean the filter and cover
from dust, wash it with tap water and leave it to dry up before you mount it back.
Finally put the filter back in the filter enclosure cover and click the cover back in place.
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7.2. Cleaning
CAUTION
Do not use any solvents for cleaning. They may be dangerous to you and damage
amplifier surfaces, paint and plastic components.
Do not open the amplifier. Cleaning of the amplifier outer surfaces can be done with a piece of soft cotton
cloth lightly moistened with clean water.
Also, clean (as much as possible from the outside, without opening the amplifier) all ventilation apertures
on the cover and the chassis, including the ones on the bottom.
DANGER
Never push or put anything into holes in the case - this will cause electric shock.
7.3. Fuse Replacement
DANGER
If replacement of fuses is necessary, first pull out the amplifier mains plug from the
mains outlet and wait for at least 3 minutes!
NOTICE
For replacement, only use standard fuses from the types recommended below.
The two Primary Mains Fuses of the amplifier are located on the rear panel (see Figure 2-1 Rear panel -
Connections). They are fuses of the "F" type (fast-acting / quick-acting / quick blow), European size 5x20
mm, ceramic (or glass) body cartridge.
The fuses must be rated for a current corresponding to your mains nominal voltage:
• 10 A / 250 V for operation from 200-240 VAC;
• 16 А / 250 V for operation from 100-120 VAC.
Suitable 10 A fuse is:
• Littelfuse, PN: 0217010.H (glass body cartridge);
This fuse can be ordered from:
- DigiKey (www.digikey.com), PN: 0217010.MXBP-ND;
- Farnell (www.farnell.com), PN: 1191761;
- Mouser (www.mouser.com), PN: 576-0217010.
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S e c t i o n MAINTENANCE | Page 43 of 52
Suitable 16 A fuses are:
• Littelfuse, PN: 0216016.MXP (ceramic body cartridge);
This fuse can be ordered from:
- Farnell (www.farnell.com), PN: 1354551;
- Mouser (www.mouser.com), PN: 576-0216016.
• ESKA, PN: 520.030 (glass body cartridge);
This fuse can be ordered from:
- TME (www.tme.eu), PN: ZKS-16A/250V.
If, after Primary Mains Fuses replacement, the device does not operate normally, we
recommend repair, performed only by a trained service technician.
Contact your ACOM dealer for assistance (see Section 1.2 Owner Assistance).
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Page 44 of 52 | S e c t i o n MAINTENANCE
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Besides the primary fuses, there are internal fuses inside the amplifier.
WARNING
Do not replace internal fuses located inside the amplifier.
Blown internal fuses can be a symptom of a more serious problem, which should be
resolved beforehand. A fault of this type will not occur under normal operating
circumstances.
Replacing internal fuses is a complex and potentially dangerous operation.
For this reason, we recommend this work be carried out only by a trained service
technician.
Contact your ACOM dealer for assistance (see Section 1.2 Owner Assistance).
Unauthorized replacement of inside fuses infringes the warranty conditions!
Besides several specific national standards, the principal fuses standard applied
worldwide is IEC 60127.
7.4. Using the Fault Codes (signatures) for Diagnostics
The data of the last 28 HARD FAULT protection trips is stored in the amplifier memory (see Section 5.5 Menu
FAULTS LOG).
The data can be downloaded from the memory through the RS-232 port and stored in a computer file even
if the amplifier cannot be turned on after a serious fault - only external power has to be fed to the Control
unit in either of the following ways:
• 8 to 15 VDC voltage applied to the "Debug mode" input (see Table 2-1 Signals and pin out of the
CAT/AUX connector) of the CAT/AUX port. The power supply has to be capable to provide
0.4 A of current;
• If the Control board has already been removed from the amplifier, it can be powered directly
with +5 V (0.4 A) and the fault log downloaded via the RS-232 port.
In the FAULT LOG reading mode (see Figure 5-6 Menu FAULTS LOG), the Control board automatically
transmits the data from the memory trough the RS-232 interface. Depending on the number of fault events
stored in the memory, the transmission may take between 0.5 and 12 seconds. A pause of 6 seconds
follows, thеn transmission starts again. The data can be read in a plain-text format with a computer, using a
standard terminal program. You can send the recorded file to your dealer or to ACOM accordingly. They
could also provide the necessary instructions, if you choose to decode the downloaded hexadecimal data
by yourself.
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S e c t i o n MAINTENANCE | Page 45 of 52
7.5. Firmware Updates
Before you change the firmware version, check the new version compatibility with the
revisions of the hardware and of the boot loader in your amplifier (see Section 5.5 Menu
FAULTS LOG). If you have any doubts about the versions, please, consult your dealer
before you undertake any action.
When ACOM issues a new firmware version, the user can upload it in the amplifier after he checks the
compatibility.
When compatibility is confirmed a return to an earlier version is also possible.
Page 46
Page 46 of 52 | S e c t i o n SPECIFICATIONS
May 2021
8. SPECIFICATIONS
8.1. Parameters
a) Standard Frequency Coverage*
1.800 - 2.000 MHz (160 m band)
3.500 - 4.000 MHz (80 m band)
5.250 - 5.450 MHz (60 m band)**
7.000 - 7.300 MHz (40 m band)
10.100 - 10.150 MHz (30 m band)
14.000 - 14.350 MHz (20 m band)
18.068 - 18.168 MHz (17 m band)
21.000 - 21.450 MHz (15 m band)
24.890 - 24.990 MHz (12 m band)
28.000 - 29.700 MHz (10 m band)
50.000 - 54.000 MHz (6 m band)**
b) Rated Output Power
• 700 W ±0.5 dB, PEP or continuous carrier;
c) Intermodulation Distortions (IM3)
• Better than 31 dB below the rated PEP;
d) Harmonic and Parasitic Emissions Output Suppression
• Better than 60 dB (65 dB typically);
e) Input and Output Impedances
User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
• Nominal value: 50 Ohm unbalanced, UHF (SO-239) type connectors;
• Input circuit: broadband, SWR below 1.2:1 (1.1:1 typically), 1.8-54 MHz continuous
range without retuning or switching;
• RF bypass path SWR - below 1.1:1, 1.8-54 MHz;
• Acceptable SWR at the output load (the antenna): up to 3:1 with proportional power
reduction and up to 1.5:1 for full output power;
f) RF power gain
• 14 dB ±1 dB (typically 27 W for 700 W output power);
* Extensions or changes of the frequency coverage are possible on request.
** Please refer the applicable region bandplans and laws for specific allocations and limitations.
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S e c t i o n SPECIFICATIONS | Page 47 of 52
g) Mains Power Supply Voltage
• 100-240 VAC (see Section 7.3 Fuse Replacement for correct fuse rating and mains voltage
range selections);
h) Mains Power Consumption at Full Output Power
• 1350 VA or less with power factor of 0.95 or higher;
i) Mains Power Consumption in Low Energy (Waiting) Mode
• Less than 1 VA;
j) Complies with CE safety and electromagnetic compatibility requirements, as well as with the
US Federal Communications Commission (FCC) regulations;
k) Size & Weight (operating, excluding connected cables)
• WxDxH: 326x365x143 mm, 13.0 kg (12.9x14.4x5.7 inches, 28.7 lbs);
l) Operating Environments
• Temperature range: -10 to +40 degrees Celsius (14
• Relative air humidity: up to 95% @ 35 degrees Celsius (95
• Height: up to 3050 m (10000 ft) above sea level without output deterioration.
8.2. Functions
a) Receive / transmit control
• KEY-IN input - Phono RCA jack. Voltage applied to the transceiver keying output - up to
+12 V; Current flown to the transceiver keying output - up to 6 mA;
• KEY-OUT output - Phono RCA jack. Output resistance: not more than 120 Ohm;
Maximum safe input voltage from the transceiver +50 V; maximum safe current flawn by
the transceiver: 20 mA;
• Minimum dead time, necessary for safe amplifier switching over from receive to
transmit: 10 ms between the transmit request on the KEY IN input and the RF drive on
the RF INPUT jack.
b) Frequency control directly by CAT from the transceiver
c) Remote control through ACOM eBox Ethernet Remote Control device or via RS-232 interface
d) Remote POWER ON by DSR/DTR and CTS/RTS lines on the RS-232 port or by ACOM eBox
Ethernet Remote Control device
e) Remote POWER ON / TURN OFF by DC voltage impulse or continuous DC voltage on CAT/AUX
port ON_RMT input.
o
F to 104 oF);
o
F);
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Page 48 of 52 | S e c t i o n SPECIFICATIONS
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8.3. Storage and Shipment
8.3.1. Storage Environment
The amplifier may be kept packed in a dry, ventilated and unheated location (with no chemically active
substances such as acids or alkalis) within the following environment ranges:
• Temperature range: -40 to +70 degrees Celsius (-40
• Humidity: up to 75% @ +35 degrees Celsius (95
o
F to 158 oF);
o
F).
8.3.2. Shipping Size and Weight
• WxDxH: Approx. 490x490x340 mm, 15.0 kg (19.3x19.3x13.4 inches, 33.1 lbs);
Figure 8-1 Packaging cardboard box
8.3.3. Transportation
All types of transportation may be used, including storage in an aircraft baggage compartment at up to
12000 meters (40000 ft) above sea level.
8.3.4. Returning to the Service Provider
NOTICE
Should it be necessary to ship the amplifier, use the original packing as described below.
Switch off the amplifier, pull the line (mains) plug out of the outlet, disconnect all cables from the rear
panel of the amplifier (remove the ground connection the last), and then pack the amplifier in its original
carton.
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S e c t i o n SPECIFICATIONS | Page 49 of 52
Waste electricals
This symbol (crossed-out wheeled bin) explains that you should
not place the electrical item in the general waste.
Waste electricals
This symbol (three green arrows going in a triangle with electrical
plug in the center) means that according to local laws and
regulations this product should be sent for recycling.
8.4. Information on Disposing and Recycling of Old Electrical and Electronic Equipment
The information in this section is applicable for countries that have adopted separate
waste collection systems.
ACOM products cannot be disposed as household waste.
Old electrical and electronic equipment and batteries should be recycled at a facility capable of handling
these items and their waste byproducts.
Contact your local authority for details in locating a recycle facility nearest to you.
Proper recycling and waste disposal will help conserve resources whilst preventing detrimental effects on
our health and the environment.
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Page 50 of 52 | S e c t i o n NOTES
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NOTES
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Page 51
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S e c t i o n NOTES | Page 51 of 52
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
Page 52
Dealer/Partner's address:
ACOM Ltd.
Bulgaria | Bozhurishte 2227
Sofia-Bozhurishte Economic Zone | 6 Valeri Petrov Str.
GPS coordinates: 42.748616о | 23.209801
о
support@acom-bg.com
ACOM and th e ACOM logo are reg istered trade marks of ACOM Ltd. i n many countries,
includ ing the EU and United St ates. I The used i mages are i llustr ave only.
Subjec t to change witho ut noce. I Printed i n Bulgaria.
All rig hts rese rved. I Design a nd content by ACOM L td.
ACOM 70 0S User's Manual I Fo urth Editio n, Revision 01 I May 2021.
www.acom-bg.com
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