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One carton contains the power transformer; the second carton contains the amplifier. The remote control unit RCU is shipped inside the amplifier in the area where the power transformer will be mounted. There are several individual purchase options available. Features Automated matching of the antenna impedance to the optimum load of the tubes during initial preparation of user tunings.
Easy to operate. No operator intervention is required when changing antennas or frequency. Thus the risk of inadvertent errors, such as incorrect antenna selection or failure to change band switch, is eliminated.
The HELP sub-menu gives on-board technical assistance and troubleshooting suggestions, power-on elapsed time hours etc. Two color strips display peak forward and reflected power. Easy maintenance. This information can be read directly from RCU display by the operator.
Retuning can be achieved in three ways: manually via the RCU, by the transceivers CAT system, or with a very short transmission - a single word on SSB or a dot even at 40 wpm on the new frequency is enough to change bands or segments automatically in a second.
Also, the initial process of user tuning settings preparation is done in less than three seconds at a quarter of nominal output power. Saves space on the operating table.
Since the amplifier is controlled by the RCU, the main unit can be located up to 20 meters 65 feet from the operating position. The supplied 3 meter 10 ft cable may be easily extended to the needed length.
Operates automatically without special signals from the transceiver - ground on TX PTT and 60W RF drive power are sufficient to control and operate the amplifier. CAT connection to most transceiver models. Broadband input matching circuit resulting in very good load to the transceiver over the entire short wave spectrum. ACOM maintains strict adherence to the tube manufacturers specifications for cooling and for the sequence of applying and removing the different tube voltages.
Starting filament current is limited, and there is constant monitoring and protection of all supply voltages and currents. The Bias Optimizer decreases the heat dissipated from the tubes, and there is automatic protection against overheating or insufficient air flow. A novel and innovative output RF Arc protection is employed.
It safeguards the amplifier, antenna, antenna selector and tuner against severe damage in case of possible break down. High voltage power supply inrush current protection which eliminates the danger of affecting sensitive devices, connected to the same mains circuit. The amplifier can be configured for 5 nominal line voltages: , , , and VAC 50 or 60Hz. Other nominal values possible on request. All functions are accessible from a computer via RS serial port connection. The amplifier is designed to meet international safety standards and complies with CE safety and electromagnetic compatibility requirements, as well as FCC regulations.
This operating manual contains information, precautions, indications for cautions and warnings which must be followed by the user to ensure safe operation and to keep the ACOMA in safe operating condition. C A U T I O N notes call attention to a procedure which, if not correctly performed, could result in equipment damage, not only in the amplifier.
N O T E notes call attention to a procedure which, if not correctly performed, could result in inconvenience. Do not touch any part inside while the amplifier is open because some residual voltages may still be present.
AVOID placing the amplifier in excessively dusty environments or in direct sunlight. Keep a minimum distance of 10cm 4 inches to the intake and 50cm 20 inches to the exhaust. WARNING Do not undertake on your own repairs or changes in hardware or software of the amplifier in order not to endanger your or others 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 anothers actions and responsibility shall be assumed by the doer. If you have any doubts about the installation, operation or safety of the amplifier, please consult your dealer. First, carefully inspect both cardboard cartons and their contents for physical damage.
If damage is apparent, notify your dealer immediately. Delay may infringe carrier's warranty conditions. Keep all packing for possible future transportation!
In order to take the RCU out of the amplifier, remove the cover by removing all screws except the eight located in the tube exhaust areas. Remove the plastic tubes holders but keep them for possible future transportation.
Do not remove the silicone rubber chimneys! Check the HV Crowbar Fig. Take the RCU out and free the compartment for installing the transformer. Carefully inspect the RCU and the amplifier main components for any possible shipping damage.
If you find any discrepancies, notify your dealer immediately to have your warranty information corrected. Most V and especially V domestic mains installations may not withstand the current consumption and you will have to reduce the output power to about W PEP.
In USA, V is strongly recommended. There might be exceptions in cases of special delivery and then the voltage set is noted in the Table of Individual Data Table An assistant may be needed to hold the amplifier steady during transformer installation. Position the amplifier, with the transformer not yet installed, flat on a table near the place where it will be used.
During the process described below, when the amplifier cover is removed, take care not to torque or twist the chassis nor let the amplifier stand on edge. Do not lift the unit by only one corner. Orient the amplifier on the table so that the transformer compartment is in front of you Fig.
For transformer mounting, four shorter bolts M8x16mm are provided in a polyethylene envelope inside the same carton. Use the polyethylene envelope to store the longer shipping bolts. Keep the board together with the four long bolts and all packing for possible future transportation of the transformer. Take care not to damage the wiring or components and position the transformer so that the captive nuts are aligned with the corresponding chassis holes.
Make sure that the transformer is centered. The transformer bolts must be installed NOW for safe operation. Holding its two sides front and back simultaneously, pull the amplifier towards you just far enough that the two outside transformer captive nuts appear off the table edge.
Support the amplifier until your assistant loosely screws in the two outside transformer-mounting bolts. Pull the amplifier a further cm about 5 inches until the other two captive nuts appear off the table edge.
Keep supporting the amplifier until your assistant loosely screws them in. After checking that the transformer is centered, tighten all 4 bolts. Now move the amplifier back over the table. Replace the cover and carefully reinstall all screws. Connections The amplifier is now ready to be connected to your station. Connection must be accomplished in the order described below, before you apply mains voltage to the amplifier.
Therefore it may be necessary to improve it considerably to become lower-resistive, i. CAUTION If this is the first time you will use a high power amplifier in your station, pay attention to the coaxial cable type from the amplifiers output. It must handle the increased power safely - particularly on the higher frequency bands. We recommend you use RG or better coaxial cable. Similar good quality coaxial cable should be used throughout your antenna system.
Check the power capability of the antenna selector, the tuner and the antenna itself especially multiband trap antennas.
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 transceivers manual. Not all transceivers however have this capability. Please see section 7 for more details. If your transceiver has not such an input dont worry - the amplifier will function normally as well and then the KEY-OUT may remain unused.
Please see section 7. The HD pinout and cable diagrams for various transceivers are shown in section 7. The cable can be supplied as an option with the amplifier or purchased separately or you can assemble your own. Check with your dealer for cable options for your transceiver. In order to use the RS interface, a special cable must be prepared. Your dealer will check that your amplifier is correctly fused before it is shipped to you.
Customers should check with a qualified electrician if the amplifier is to be used outside the country in which it was purchased. 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 plug which meets the Safety Class I units standard in your country. The ground lead of the amplifier's mains 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. All amplifiers sold in the USA will have two fused leads. Make certain that the grounding lead is connected properly 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 2.
Check if the respective fuses can handle current up to 20A, as well as if the voltage corresponds to the voltage for which the amplifier is set S. If you connect the amplifier to a different mains outlet, be sure that you check it, too. Make sure the main Power Switch on the front panel is in OFF position so that the red strip on the switch is hidden and insert amplifier's mains plug into the wall outlet prepared for it.
The amplifier remains switched off. For higher duties the fan is recommended. The auxiliary fan xmm is supplied as an option with a set of 8 screws, nuts and washers. It may be mounted by the manufacturer or dealer on request Fig.
Pay particular attention when you move it from a very cold into a very 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. CAUTION To avoid damage not covered under warranty carefully check that the voltage for which the amplifier is set corresponds to your mains nominal voltage see S.
After following all instructions in S. The front-panel red indicator must light and a picture will appear on the RCU Fig. See Section for details on programming your callsign.
In this condition, only the RCU is operational, while the amplifier itself is still fully off. The assigned number and name of the currently used antenna is shown at the right bottom corner of the display, just above the antenna-change key.
Except for the main power switch on the front panel, the amplifier is controlled via the RCU see Fig The six buttons immediately below the bottom of the display are soft keys and their function can vary depending on what the context is at the time.
As you explore the various functions of the amplifier, the functions of these buttons are explained in detail. You can proceed in one of two directions: a you can enter the OFF menu see below or: b you can turn on the amplifier and begin the warm-up sequence. After 2. Then with the left and right arrow buttons you choose the desired value or move the colored frame on it.
The call sign character positions are selected by left and right arrow buttons. Push the left button repeatedly to return to the items list. The purpose and use of the OFF menu settings are described in detail in Section 6, after the description of the basic functions and use of the amplifier. You can start operation immediately after it is installed.
However, to make full use of its possibilities and to fully configure the amplifier we recommend that you thoroughly read the following information. During warm-up the amplifier remains in STB, so you can operate with the transceiver only. You can also change the antennas manually or read the HELP texts during the warm-up period.
NOTE When you intend to have a brief pause in operating e. Tube life may be shortened by repeatedly turning on and off the tube heater supply. If you are concerned about this, discuss it with your dealer.
NOTE However, if you unintentionally power-off the amplifier, it is best to switch it on again immediately. When the pause is short up to one minute and the cathodes are still warm, the warm-up period is shortened significantly, which reduces the waiting time and prolongs the tube's expected life.
At the same time the stepper motors conduct a self-test and finally tune the plate circuit to the frequency segment on which the amplifier was last used. Unless transmitting, only the last one is active, indicating the Exhaust Air temperature in degrees C. The whole HF spectrum is divided into segments. Segment width increases with frequency from 25kHz on m to kHz on 10m. You can use up to ten different antennas and tunings per segment. This may be useful with narrow-bandwidth antennas.
The frequency segment on which the amplifier is tuned in MHz is indicated on the left-hand side on the display.
Below the frequency segment, the number of the antenna in use is displayed along with its name, and how the antenna was selected manual or auto. If the CAT connection to the transceiver is turned on, the transceiver type is shown at the left side under the antenna field. At the bottom left it is shown the tune type for the current frequency segment and antenna in Figure , DEFAULT is shown indicating as factory programmed.
At the bottom right there are three indicators available which warn you with yellow light when the heater voltage, the plate current, or the drive RF power are approaching their limits. The bar graph on the upper line indicates the power fed into the antenna forward power and the smaller bar graph below - the power reflected from the antenna RFL. The difference between If there is no active CAT connection to the transceiver, and you start transmitting on a frequency different from the indicated segment and the amplifier is in OPERATE mode , it automatically senses your operating frequency, selects the corresponding segment, and tunes up on it.
This retuning takes less than one second and you are immediately ready to operate on the new band. Example: Fig. This would prevent the control system of being let down, while measuring a low-temperature but still-standing air above hot tubes. Clean or replace the air filter. Add the optional external fan in severe temperature conditions, and for continuous modes of operation. Typically Protection thresholds: more than 40V during standby; less than V or more than V during operate.
Adjusted in the factory during setting of plate idling currents for minimum IMD see p. Multiple protections and tuning criteria are based on this information. In addition of the above listed, a variety of values are checked dynamically while the amplifier's status is being changed, thus more protections may trip if bad conditions are detected.
For instance, the heater current peak, HV, and EG2 are differently controlled during the power-on period, or while changing from standby to operate and vice versa.
Mains voltage tollerances. See S. For instance, this is No protection is directly associated with the mains voltage, but nearly all supply voltages and some currents would reach threshold values, so various amplifier protections would begin tripping, in order not to let any damage in both: power supply, or the tubes.
This hysteresis is intended to reject unusable RCU restartings if the voltage is continuously fluctuating near the lower limit. You may find also suitable automatic AC voltage regulators on the market. An additional possibility is foreseen in order to partly compensate for any mains voltage deviation not to affect the tubes plate efficiency.
For lower voltages first set lower nominal taps of the transformer i. Anyway, a voltage of Please note, that this menu selection does not change the real supply voltages, but only the plate load resistance to which the AUTO TUNE procedure would match your antennas.
With HIGH selection you will request a higher plate resistance, and vice versa, thus merely doing the best at your real conditions. Information provided by Vasco, LZ1JK Using ALC feedback from the amplifier to the transceiver, in order to limit the PEP drive, sometimes results in a potentially unstable system, which may tend to generate relaxations.
This depends on the resulting loop gain and timing parameters, that is why a careful adjustment is needed to make it useful. Anyway, as you decided to use the ALC system, here are the amplifier's ALC output electrical specifications of ACOMA : - maximum output voltage negative to ground up to V; - output resistance about Ohms; - maximum output current up to mA self-protected.
When the control grid G1 current changes between zero and 5mA both tubes summary , the ALC voltage is zero. When this threshold is exceeded, a negative voltage appears on the ALC output, which is proportional to the amount of grid current above the 5mA threshold. Its maximum value V is reached around 15mA grid current, and can be reduced to zero via the ALC regulator.
What I could suggest is to reduce the maximum voltage generated by ACOMA, in order not to exceed the maximum permissible voltage for your transceiver. Increase drive power until you reach mA grid current. Do not exceed 20mA as a protection would trip there.
At this point you will have the maximum ALC output voltage from ACOMA, so reduce it until it becomes safe for your transceiver's ALC input check in your transceiver's operating manual for the proper voltage value. This can be done via either a relay contact or a semiconductor transistor or integrated circuit with suitable polarity plus to the ground.
NOTE: You should prefer a semiconductor output when it is available on your transceiver, since relay contacts on some models are slow with respect to their RF output. This message means that an eventual hot switching has been prevented by the amplifier's protection system. You should change to the semiconductor output in such conditions.
In addition, utilizing the semiconductor output, you may disable the transceiver's relay clicking on some models there is a switch intended for a case when the relay is not needed. Look at 3 for a second way. For the preferred mode, you have to connect the KEY-IN socket to the transceiver's output that goes to the ground when you transmit. Practically all transceivers have such an output, and their electrical specifications exceed the amplifier's requirements.
Some transceivers require that their signal "ground on transmit" be implemented via a software command, or by changing of a switch on the rear panel, or interior of the transceiver. Then, you may need a simple n-p-n or n-mos transistor, controlled through a 10kOhm resistor to the base or gate, in order to "invert" the available signal in a "GND on TX".
Look in your transceiver's manual or contact your dealer or ACOM directly for details about a particular model. Please use always shielded cables for these connections.
When you don't use the second method of the connection see p. The KEY-OUT output is usable when the transceiver has available a respective input to disable transmitting when the amplifier may need it. If your transceiver however possesses a suitable input that is capable to disable transmission, we recommend that you utilize that feature.
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