ACOM 1010 User Manual ( oper_man_eng_a1010)
Contents
1. They are European size 5 x 20 mm 0 8 A 2 A and 5 A time lag slow blow type Suitable types are HV PCB 2 A 250 V SLOW BLOW Time Lag 5 x 20 mm LITTELFUSE 0218002 Wickmann 1951200000 MAINS PCB 5 A 250 V SLOW BLOW Time Lag 5 x 20 mm LITTELFUSE 0218005 Wickmann 1951500000 MAINS PCB 0 8 A 250 V SLOW BLOW Time Lag 5 x 20 mm BUSSMANN type 504 800mA These latter fuses must not be replaced by the user Replacing these internal fuses is potentially dangerous and must be done only by a trained service technician Contact your ACOM dealer for assistance 5 3 Tube Replacement A single Svetlana 4CX800A GU74B high performance ceramic metal tetrode is used in the amplifier Replacement is a complex and potentially dangerous operation that involves adjustment of the plate idling current This should not be attempted by the user Contact your ACOM dealer 5 4 Simplified Schematic Diagram See Fig 5 1 ACOMIOIO Simplified Schematic Diagram The 4CX800A GU74B Svetlana high performance ceramic metal tetrode V1 with plate dissipation of 800 W is grid driven The input signal from the RF INPUT jack is passed through a broadband input matching circuit which consists of components on the INPUT PCB and includes the drive power swamping resistor Rsw This circuit tunes out the input capacitance of the tube The swamping resistor Rsw is a termination load for the matching circuit and can dissipate up to 80 W of RF drive power It also2. advisable to adjust amplifier tuning when antennas have been changed snow has fallen new objects are in the near field of the antenna etc Such changes may affect antenna impedance NOTE If you use more than one antenna on a band the proper antenna must be selected prior to performing the tuning procedure outlined below CAUTION To avoid damage not covered under warranty do not switch the BAND switch knob while transmitting As discussed above hot switching will damage the amplifier s band switch CAUTION Also never apply drive longer than one minute continuously without pausing for at least one minute to allow the tube to cool It is recommended that for initial tuning a frequency in the middle of the band be used First with no transceiver power applied select the band Then use Table 4 to achieve an approximate preset for both TUNE and LOAD capacitor knob settings Band MHz LOAD Knob Dial TUNE Knob Dial 1 800 2 000 3 500 4 000 7 000 7 300 10 100 10 150 14 000 14 350 18 068 18 168 21 000 21 450 24 890 24 990 28 000 29 700 Table 4 1 Approximate tuning preset b Tuning Procedure 1 Once the antenna and band have been selected and the TUNE and LOAD adjustments have been initially set as indicated in Table 4 1 apply between 10 and 20 W of continuous key down CW signal 2 Look at the upper LED bar graph FORWARD POWER and adjust the TUNE right hand capacitor for maximum indicatio
3. country in which it was purchased Due to different line mains standards in different countries the dealer will provide the correct Safety Class plug for your location The ground lead of the power cable is colored yellow with two green stripes If you have any doubts about the correct way to connect these wires consult your dealer WARNING Before connecting the amplifier to your line mains supply be sure that the line mains supply is correctly wired and is capable of providing the required current i e up to 5 A from 240 V and 10 A from 120 V As discussed earlier it is very important that the ground lead is adequately sized and properly connected The Power Switch on the front panel must be in the OFF position only then should you insert the amplifier s line mains plug into the appropriate wall outlet At this time the amplifier remains switched off 3 POWER ON CONTROLS AND INDICATORS CAUTION Do not turn the amplifier on for at least 2 hours after unpacking it and locating in its operating location Pay particular attention whenever the amplifier is moved from a very cold place to a very warm one because unseen condensation may develop and this could result in damage to the high voltage circuits of the amplifier Under these circumstances do not turn the amplifier on for at least 4 hours A similar effect could occur following rapid warming of the location such as winter use of a powerful electric heater CAUTIO
4. diagrams are available from ACOM or from your dealer on request 5 5 Service Functions By pressing the OPER and RTTY buttons simultaneously the upper LED bar graph is switched to the service mode which is indicated by both red bar graph lights and the yellow Gl light illuminating Pressing the OPER and RTTY buttons together again will select additional service measurement functions Pressing them a final time will return the amplifier to the normal operating mode These steps are detailed below a Press the OPER and RTTY buttons together The two red lights on the right side of the upper bar graph will illuminate to confirm that the amplifier is in the service mode The yellow GI light will also illuminate The upper bar graph should show a grid current reading no higher than 5 mA 5 LEDs illuminated b Pressing the OPER and RTTY buttons once again will now illuminate the yellow G2 light This provides an approximate reading of grid 2 voltage The upper bar graph should show a voltage reading within the range of either 270 300 Volts 9 10 LEDs illuminated for RTTY or 210 330 Volts 7 to LEDs illuminated for SSB and CW c Pressing the OPER and RTTY buttons yet again will illuminate the yellow IP light This provides an approximate reading of combined plate current and grid 2 current The reading should be no higher than 500 mA 10 LEDs illuminated for RTTY or 600 mA 12 LEDs illuminated for SSB and CW d Pressing the OPER and RTT
5. grave danger of fatal electrical shock NEVER TOUCH AN ANTENNA during transmission as this may result in an electric shock or burns NEVER EXPOSE the amplifier to rain snow or any liquids AVOID placing the amplifier in excessively dusty environments DO NOT OBSTRUCT AIR INTAKE bottom or EXHAUST top cover areas of the amplifier Keep a minimum distance of 50cm 20 inches clear of the air exhaust opening WARNING Do not undertake or perform any repair or adjustment of your amplifier yourself including any attempt to change hardware or firmware Doing so creates a potentially fatal shock hazard and may damage the amplifier or equipment connected to it ACOM is not responsible for any such personal injury or equipment damage whether caused by accident or as a result of good faith efforts at repair or adjustment CAUTION To avoid damage to the amplifier not covered by ACOM s warranty the user is expected to read and comply with the installation instructions contained in Section 2 of this operating manual If there are any doubts or questions concerning installation operation or safety of the amplifier the user should contact ACOM 2 INSTALLATION 2 1 Unpacking and Initial Inspection NOTE The first step to installation is to fully read this manual Then carefully inspect the shipping cartons for any physical damage ACOM ships amplifiers in highly protected containers but it cannot assure that mistreatment by shippers will not
6. solvents for cleaning as they may be dangerous to you and damage amplifier surfaces and plastic components Do not open the amplifier Cleaning the amplifier outer surface may be safely accomplished by using a piece of soft cotton cloth lightly moistened with clean water 5 2 Fuse Replacement WARNING If your amplifier is only fitted with one line mains fuse it is suitable for the European Community ONLY Your dealer will check that your amplifier is correctly fused before it is shipped to you based upon your indicated location Customers should check with a qualified electrician if the amplifier is to be used outside the country in which it was purchased CAUTION For 120 V ac operation the fuses should be rated at 10 A for 240 V ac operation the fuses should be rated at 6 3 A If it is necessary to replace the line mains fuses use only those that are permitted under local safety codes The two primary line mains fuses in the amplifier are located on the rear panel Fig 2 1 They are of the fast quick blow type European size 5 x 20 mm Use 10 A for 100 120 V ac operation 6 3 A for 200 240 V ac operation Suitable types are For 120 V 10 A 250 V 5 x 20 mm fast quick blow LITTELFUSE 0217010 Wickmann 1942100000 For 240 V 6 3 A 250 V 5 x 20 mm fast quick blow LITTELFUSE 021 706 3 Wickmann 1931630000 Besides the primary fuses there are also fuses located on the HV PCB and on the MAINS PCB inside the amplifier
7. HF LINEAR AMPLIFIER G1 G2 IP F AAA EN WO 9952955525 5 559 60 ic 3 2 Wik Ts i desto J 2428 PEL so 50 o RAM 20 W Y 20 ON NY Y Ny Pe E 10 gt 7 90 10 gt 90 OPER A1 A2 y L 3 HF LINEAR AMPLIFIER Table of Contents Il GENERAL INFORMATION l I Introduction and Description 2 Owner Assistance 3 Equipment Supplied 4 Features 5 Safety Considerations Explicit Definitions 2 INSTALLATION 2 Unpacking and Initial Inspection 2 2 Line Voltage Selection 2 3 Amplifier Location Selection 2 4 Connections 3 POWER ON CONTROLS AND INDICATORS 4 OPERATION 4 Turning ON and OFF 4 2 Changing Operate and Standby Modes 4 3 RTTY Mode 4 4 Antenna change 4 5 Tuning 5 MAINTENANCE 5 1 Cleaning 5 2 Fuse Replacement 5 3 Tube Replacement 5 4 Simplified Schematic Diagram 5 5 Service Functions 6 SPECIFICATIONS 6 Parameters 6 2 Functions 6 3 Storage and Shipment Il 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 I 1 Introduction and Description This manu
8. N To avoid damage that may not be covered by the amplifier warranty carefully check that the voltage for which the amplifier is set corresponds to your nominal line mains voltage See Section 2 2 and Table 2 1 After following all instructions in Section 2 you may now turn ON the main power switch on the front panel Fig 3 1 The green LED indicator above the switch will illuminate 0000000000000006 Gi G2 IP F 600000000 0000 eo OPER RTTY A1 A2 O Ge O HF LINEAR AMPLIFIER Fig 3 ACOMIOIO Display and Control Note that the upper LED bar graph always reads peak forward power except for the service functions Section 5 5 The 800 W scale resolution is 50 W Note also that levels below 50 W may be not detected The lower LED bar graph will indicate reflected power up to 240 W The scale resolution is 30 W The OPER button alternatively switches between the operate and standby modes once the amplifier has completed its 50 second warm up period See Section 4 2 The RTTY button reduces the output power of the amplifier to 500 W See Section 4 3 The button labeled Al A2 Section 4 4 changes the antenna output to either antenna or antenna 2 according to the operator s choice It is the operator s responsibility to connect suitable antennas to the ANTI and ANT2 connectors on the rear panel of the amplifier The red TX LED illuminates whenever the KEY IN input is keyed closed to ground i
9. ORWARD and REFLECTED power readings For instance with a 2 5 1 VSWR readings of 800 W and 150 W FORWARD POWER and REFLECTED POWER respectively the real OUTPUT POWER is 650 W At very high VSWR levels such as when no antenna is connected or a badly mismatched antenna is used the FORWARD and REFLECTED readings will be almost equal while the real OUTPUT POWER the difference between them will be nearly zero The amplifier can operate safely as long as the REFLECTED POWER is LESS THAN 250 W Matching is assured for loads presenting a VSWR of up to 3 1 Nevertheless for some loads and bands matching is possible at even higher VSWR levels but the drive power must be reduced to prevent the REFLECTED POWER from exceeding 250W Failure to comply with these guidelines will cause the protection circuits to trip For example if the antenna VSWR were 5 1 the maximum attainable forward power would be 540 W 240 W of reflected power and real output to the antenna and transmission line of only 300 W In the event your antenna cannot be adjusted to produce a lower VSWR an external antenna tuner may be deployed CAUTION At elevated VSWR levels high voltages and high currents are distributed along the coaxial cable to the antenna risking internal arcing and heat generation and likely damage to the cable and any antenna switches that may be used It is recommended that VSWR levels of more than 3 1 not be permitted with coaxial cable above 14 MHz It is
10. Y buttons a final time will restore the upper bar graph to its normal function of indicating peak forward power NOTE The auto protection system will continue to operate in the service mode 6 SPECIFICATIONS 6 1 Parameters a Frequency Coverage All amateur bands in the 8 29 7MHz frequency range extensions and or changes on request b Power Output 700 W PEP or 500 W continuous carrier c Intermodulation Distortion Better than 35 dB below rated output d Hum and noise Better than 40 dB below rated output e Harmonic Output Suppression Better than 50 dB below rated output f Input and Output Impedance Nominal value 50 Ohm unbalanced UHF SO 239 type connectors Input circuit broadband VSWR less than 1 3 1 8 30 MHz continuously no tuning no switching Bypass path VSWR less than 1 8 30 MHz continuously 200 W maximum Output antenna impedance matching capability VSWR up to 3 1 or higher g RF Gain 1dB typically frequency response less than IdB 50 to 70 W drive power for rated output h Primary Power 85 132 70 264 V ac 100 110 120 200 210 220 230 amp 240 V nominal taps 10 15 tol 50 60 Hz single phase 1200 VA i Complies with CE safety and electromagnetic compatibility requirements as well as FCC regulations 10 amp 12 m band locks provided j Size amp Weight operating WxDxH 402x315xl66mm 8kg 15 83x12 4x6 5 inches 39 7Lbs
11. al explains the installation operation and maintenance of the ACOMIOIO HF linear amplifier The ACOMI010 is a self contained linear amplifier that covers all amateur bands from 1 8 through 29 7 MHz It provides over 700 W PEP of output power or 500 W in continuous duty operation with less than 60 W of drive The amplifier is designed to tolerate VSWR levels of up to 3 1 throughout its operating range and tuning is simplified by ACOM s exclusive True Resistance Indicator TRI Also a built in antenna selector switch with two outputs is included to provide instant choice of antennas Importantly a variety of system parameters are continuously monitored and available to the operator to assure safe and efficient amplifier operation l 2 Owner Assistance If technical or operating assistance is needed your local dealer should be contacted first In the unlikely event you need further information you may get in touch with ACOM by facsimile telephone email or standard mail Fax 359 2 920 9656 telephone 359 2 920 9655 e mail acom Omail orbitel bg standard mail ACOM Bul N Mushanov 151 1330 Sofia Bulgaria 1 3 Equipment Supplied The ACOM 1010 amplifier and this manual are shipped in a cardboard carton l 4 Features e Easy operation The plate load True Resistance Indicator TRI is an ACOM innovation that provides quick and precise tuning typically in less than 10 seconds The auto operate function will return the amplif
12. ce to other stations and greater safety to the amplifier components e Transceiver independent The amplifier operates without special signaling from the transceiver it needs only ground on TX and 60 W RF drive power to operate at full output power e Input matching Broadband input matching circuitry offers excellent loading characteristics for the driving transceiver from 8MHz to 30MHz e Single tube operation A single Svetlana 4CX800A GU74B high performance ceramic metal tetrode with plate dissipation of 800W forced air cooling grid driven is used for maximum efficiency e Permanent monitoring and protection of the plate and grids currents The Bias Optimizer minimizes heat dissipated by the tube assuring tube longevity e High voltage protection Design of the high voltage power supply eliminates the danger of turn on transients affecting sensitive devices connected to the same line mains circuit Moreover the amplifier can be configured to accommodate any of 8 nominal line voltages between 100 and 240 V 50 or 60 Hz e Band inclusion The amplifier can be shipped with 10 and 2 meter capability disabled as required by the Federal Communications Commission FCC for United States users Contact your dealer about enabling those bands 1 5 Safety Considerations Explicit Definitions The ACOMIO0IO HF Linear Amplifier is a Safety Class unit The grounding lead yellow with 2 green stripes of the power cable and the gr
13. e when the transceiver goes into the transmit mode See Section 2 4 d The BAND knob controls the band switch and LOAD and TUNE are used to adjust their respective variable air capacitors in the amplifier s output circuit The settings of these three controls must be changed at each band change as well as when an antenna is changed The three LED indicators located above the knob LOAD are called the TRI tuning indicator and they are used to achieve antenna impedance matching during a re tune procedure Please see Section 4 5 for a discussion of the tuning procedure CAUTION To avoid damage not covered by the amplifier s warranty do not turn the BAND switch while transmitting Switching while transmitting is called hot switching and it will cause irreparable damage to the band switch There are three warning LED indicators and one fault LED indicator located in the bar graphs area The following describe the error conditions and the correct responses except for the service functions Section 5 5 Gl when illuminated a control grid overload condition exists reduce the drive power for safe operation 9 G2 when illuminated a screen grid overload condition exists reduce the drive power and or refresh the tuning Section 4 5 for safe operation IP when illuminated a plate current overload condition exists reduce the drive power and or refresh the tuning Section 4 5 for safe operation F when
14. e The red F fault LED illuminates and the amplifier automatically goes to the standby mode for several seconds Also the green OPER LED goes off The amplifier will indicate the reason for the protection trip 13 if one of the yellow GI G2 IP warning LEDs is illuminated along with the F LED a current limit has been exceeded drive power must be reduced or retuning is necessary if the last red LED of the reflected power bar graph is illuminated together with the F LED the reflected power limit has been exceeded the drive must be reduced or the antenna VSWR must be improved if all three LEDs of the TRI are flashing simultaneously together with the F LED the tuning is not adjusted correctly most likely the antenna impedance has changed and retuning is required Fault information normally remains on the display for several seconds while the amplifier is in the standby mode The auto operate function will attempt to return the amplifier to the operate mode automatically If the protection trips repeatedly the user must attend to the cause of the trip which is typically too much drive or antenna mismatch CAUTION If all LEDs in the bar graph area are flashing simultaneously you must immediately switch off the amplifier to avoid damage 5 MAINTENANCE If no indicator glows upon switching the amplifier on the main fuse s may have blown See Section 5 2 5 1 Cleaning WARNING Do not use
15. e air exhaust ports This means the amplifier should not be located under a shelf or other structure that could impede the free movement of air away from the amplifier DO NOT OBSTRUCT AIR INTAKE bottom and EXHAUST top cover areas of the amplifier Keep a minimum clear distance of 50cm 20 inches above the exhaust opening 2 4 Connections Before applying line mains voltage to your amplifier follow the steps listed below in the order they are presented WARNING Note that your grounding system may have to handle a current of more than 15 Amperes This requires an adequately sized and well maintained conductor of at least 4 mm2 AWG II or SWG 13 If this is not the case at your operating location you should make the necessary changes using a licensed electrician FUSE 5x20 A A FUSES CE 100 120v 100 GD ACOM moner acom 1010 200 240V 6 3A y Pett eae COVER SERIAL NO 100 120 or 200 240 V 50 60 Hz 1200 VA FCC ID RF INPUT ANT1 ANT 2 KEY IN gp GND KO e Ge O I MADE IN BULGARIA e e 9 00 9 Fig 2 1 Connections a Connect the station s grounding system to the wing nut ground stud of the amplifier on the rear panel marked GND in Fig 2 1 b Connect a suitable coaxial cable between the transceiver output to the amplifier rear panel RF INPUT SO 239 connector using PL 259 connector CAUTION The coaxial cable from the amplifi
16. ed location with no chemically active substances such as acids or alkalis within the following environment ranges Temperature range 40 to 70 degrees Celsius Humidity up to 75 35 degrees Celsius b Shipping Size and Weight WxDxH 535x445x270mm 2 kg 21x17 5x10 6 inches 46 3Lbs C All types of transportation may be used including storage in an aircraft baggage compartment at up to 12000 meters above sea level C 1 I M4 I 0 2pF S1A S1B sic l 1 Ca D 2x2 2n 6kv PLATE section Pl section L section Cb3 1 1 8MHz pos 1 8MHz pos 1 8MHz pos Cv 1 j L 2 CA s0239 I 1 Cb3 2 L ai E i CPi PI COILS L COIL ie A ii RFC1 5 35pF LP1 LP2 w A2 4CX800A 160uH 47uH 1 9uH LL CA SO239 D GU74B TE 1 8 10MHz 18 30MHz 10 4uH ii vuole jn ue WATTMETER I 2 B I i Eug m lc euenire x BAND 35 7 10 614 94 1 4 42 JP g Cb1 1 35 7 o 4 84 2 2n 6kV d qoc ran AA ee cae nt I I Y 4 118 212 BEA l 2 a Q E 2 E Frys 5 23 INPUT Rsw Csg 502397 4 50 100W 12x820pF Gb N Cs d 1 Input Relay CL 4 S99 5 2 1kV 2 2n 6kV 1 6 18MHz er i TQ2 12V 4 6 PART OF 24 28 y y Rc 1 SOCKET 1 I Q l Ww 1 ov 3 5MHz 8 I I i RFC2 1 18 21 d 3 I INPUT DN 7MHz CL4 1 CL4 4 l 4x130pF 2kV 1 5kVA PCB I Cb2 i 2 2n 6kV CLA CL2 I AS 12 340pF 15 450pF Y Y j I VSsg a1 LID 2017 LOAD 013
17. eliminates any tendency toward oscillation by the tube ensuring excellent RF stability of the amplifier The cathode resistor Rc creates DC and RF negative feedback thus stabilizing gain and equalizing frequency response The combination Lpl Rpl in the plate circuit is a VHF UHF parasitic suppressor DC plate voltage is fed through chokes RFCI RFC2 and the capacitor Cb3 blocks it from the output The output tank comprised of LPI LP2 LL CPI CP3 and CLI CL4 forms a classic Pi L network and suppress harmonic frequency emissions This circuit is switched and tuned by SIA SIC and the air variable capacitors CPI 2 and CLI 2 The output signal is fed through the antenna relays KI and K2 in the WATTMETER PCB The WATTMETER PCB also includes a high pass filter for frequencies below 100 kHz and it prevents the plate supply from reaching the antenna The plate RF voltage is monitored through the capacitor Ca and together with the RF WATTMETER is the main source of information for the control circuit of the amplifier in evaluating tuning quality The control circuit is based on the ATMEGA 8L micro controller from Atmel All voltages are delivered from the line MAINS and HV PCBs The currents of the control grid screen grid and the plate as well as the reflected power and tuning quality etc are continuously monitored by the micro controller Many 15 software derived protections are based on this information Detailed electrical schematic
18. er s output must be capable of handling the amplifier s output power safely particularly on the 0 meter band It is suggested that at a minimum RG8X including RG8MINI RK50 4 1 1 RK50 4 13 or even better RG213 including RK50 7 1 I coaxial cable be used c Connect a suitable coaxial cable from the antenna to the appropriate amplifier output on the rear panel marked ANTI or ANT2 using a PL 259 plug d Runa 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 NOTES Your amplifier will not work if KEY IN is not connected properly Transceiver producers assign different names to their ground on transmit output terminals e g TX GND SEND T R LINE etc Some transceivers may require that ground on transmit be implemented by asoftware command or by changing the setting of a switch on the rear panel or inside the transceiver Check your transceiver s manual for more information on keying amplifiers e Preparation of the wall outlet for the amplifier WARNING If your amplifier is only fitted with one line mains fuse it is suitable for the European Community ONLY Your dealer will check that your amplifier is correctly fused before it is shipped to you based upon your indicated location Customers should check with a qualified electrician if the amplifier is to be used outside the
19. ier to the OPERATE mode automatically after each protection trip saving time and avoiding manual switching e No tuner needed No external antenna tuner is required as long as the antenna VSWR is 3 1 or lower The amplifier will perform the functions of an antenna tuner enabling you to change antennas faster and use them over wide frequency ranges e A durable amplifier This amplifier is both user friendly and self monitoring It is designed to safely withstand up to 240 W of reflected power up to 100 milliseconds of drive spikes RF tails after a PTT or KEY release and even operator tuning errors It is also capable of operating at more than half its designed output power at only 7596 of nominal line mains voltage Because it can tolerate deep voltage drops down to zero for 10 milliseconds and 1596 line voltage spikes it is particularly suited for use in portable environments such as field days and DXpeditions e LED bar graph display The upper LED bar graph always reads peak forward power except for the service functions while the lower LED bar graph is for the reflected power LED warning indicators are provided for abnormal conditions of grid grid 2 and plate parameters e Antenna selection Two antenna outputs are selectable on the front panel of the amplifier e Efficient tuning Antenna matching can be achieved in less than 0 seconds and at a quarter of nominal output power which produces lower risk of interferen
20. illuminated the amplifier automatic protection has tripped If F is accompanied with one of the GI G2 or IP condition indicators the cause of the protection trip will be evident When F alone is illuminated check the keying wiring Section 2 4 d See Section 4 6 for details about the auto protection system 4 OPERATION Operation of the amplifier is simplified through ACOM s innovative TRI tuning aid Auto Operate function and automatic protection systems To make full use of the amplifier s potential and to configure it to local conditions the following information should be read carefully 4 1 Turning ON and OFF In order to turn on the amplifier press the power switch ON at the bottom right corner of the front panel The LED indicator above the switch will glow green and the audible cooling fan will start Following aseries of automatic self tests the OPER LED will begin to flash green and will continue to do so during the 150 second warm up period Throughout this period the amplifier will remain in the standby mode and the transceiver may continue to be used Also during this period the Al A2 button may be pressed to change antennas i e between the antennas connected to the ANTI and ANT2 terminals on the rear panel of the amplifier Switching between the antennas does not affect the warm up process CAUTION To avoid damage not covered under warranty do not change the antenna output during a transmission i e never pre
21. k Operating environments Temperature range 0 to 50 degrees Celsius Humidity up to 95 35 degrees Celsius Height up to 3000 m above sea level without output deterioration 6 2 Functions a Antenna Impedance Matching Process aided by a plate load True Resistance Indicator TRI b Two antenna outputs selectable by a button on the front panel c Protections Cover interlock for operator s safety Inrush power on current limited to the nominal consumption Control grid screen grid and plate currents T R sequencing Antenna relay contacts including RF power induced in antenna from another nearby transmitter Antenna matching quality Reflected power d LED bar graphs for forward peak power and reflected power e Service visualization of grid DC current grid 2 DC voltage and plate DC current f Tube a single Svetlana 4CX800A GU74B high performance ceramic metal tetrode with plate dissipation of 800 W grid driven forced air cooling 6 3 Storage and Shipment CAUTION 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 a Acceptable storage environment The amplifier may be kept packed in a dry ventilated and unheat
22. knob is turned to the left with a centered TRI there will be more gain but less linearity When available drive power is insufficient or when less output but better efficiency are needed e g for RTTY and SSTY this may be desirable Tuning to the right of the center would lead to the opposite result i e less gain and more power attainable Of course this requires more drive power more plate current and more plate heat which shortens tube s expected life Off center tuning may also be used to compensate for line mains voltage variations in order to maintain tube efficiency In that case tune to the left when line mains voltage is high or tune to the right if it is low However where there is more than a 10 difference from the nominal line mains voltage the voltage selector inside the amplifier should be changed See Section 2 2 Line Voltage Selection 4 6 The Auto Protection System When any abnormal amplifier condition is detected by the auto protection microprocessor the risk will be evaluated automatically and either of two levels of protection will be applied a The first degree of protection consists of an illuminated LED warning These include the yellow LED warnings discussed earlier i e Gl grid 1 G2 grid 2 and IP plate Operation may be continued but the amplifier is likely to proceed to the second degree of protection the trip b The second degree of protection is a trip to the standby mod
23. n 12 3 Watch the TRI indicator above the LOAD left hand capacitor and turn the LOAD capacitor in the indicated direction to center the green LED indicator light 4 Increase the drive power to get the desired nominal output then repeat steps 2 and 3 always peaking output with the TUNE adjustment NOTE No light on the TRI indicator means that the tuning is too far off To correct this turn the LOAD and TUNE knobs around the table suggested positions until the TRI indicator illuminates no light tuning is far left tuning is far right marker inside LOAD is tuned use TUNE knob turn LOAD knob turn LOAD knob turn LOAD knob turn TUNE knob for max Power to the right to get to the left to get slightly left to peak Forward to get any marker the inside markers inside markers to center it Power Fig 4 1 Using TRI tuning aid The TRI indicator will not illuminate until at least 20 W of forward power output is achieved In the event successful matching cannot be accomplished check the BAND switch position and antenna selection Then check the antenna VSWR at the same drive frequency d Tuning hint A benefit of TRI is that the knob positions are virtually independent The plate load resistance decreases to the right and increases to the left of the TRI center A centered tuning indication corresponds to the proper LOAD capacitor tuning which presents an optimum load resistance to the tube If the LOAD
24. occur If there is any such damage notify your ACOM dealer immediately Failure to do so may invalidate your warranty In any case be sure to keep all packing materials for possible future amplifier shipment 2 2 Line Voltage Selection CAUTION To avoid damage to your amplifier and to maintain your warranty coverage be certain that the amplifier line mains voltage setting corresponds to your nominal line mains voltage Normally the amplifier is delivered with the Voltage Selector set for a nominal line voltage of 240 V If your line voltage is not 240 V you must contact your dealer for instructions on how to change the voltage selector inside the amplifier The only exception to this is if the unit has been custom ordered in which case the voltage selection will be noted in the Table of Individual Data Table 2 1 below AMP s n Tube s n Voltage Selector VAC Table 2 1 ACOM 1010 Individual Data 2 3 Amplifier Location Selection Locate the amplifier as close as possible to where it can be used conveniently Access to the command knobs and indicator s area as well as to the rear panel cabling will be necessary No device that is sensitive to magnetic fields including dynamic microphones should be located adjacent to the right side of the amplifier where the power transformer is mounted The amplifier should generally be placed to the right of your transceiver No temperature sensitive devices should be located above th
25. ound stud on the rear panel of the amplifier marked GND 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 operating manual contains an assortment of precautions and warnings that MUST BE FOLLOWED BY THE USER to ensure safe operation of the amplifier The safety definitions below apply to this operating manual A WARNING is associated with a procedure that if not properly performed could result in a fire hazard or electric shock with resulting injury or death to the user A CAUTION is associated with a procedure that if not properly performed could result in damage to the amplifier or other equipment A NOTE is associated with a procedure that if not properly performed could result in inconvenience or physical injury to the user WARNING HIGH VOLTAGE The amplifier works with voltages up to 3000 V dc which are potentially LETHAL You must unplug the amplifier from the line mains wall outlet and WAIT AT LEAST 30 minutes before removing the cover of the amplifier Do not touch any part inside while the amplifier is open because dangerous voltages may remain present WARNING HIGH VOLTAGE NEVER ALLOW ANYONE ESPECIALLY CHILDREN to push anything into the case holes or to otherwise touch the amplifier or its connecting cables There is
26. rhrhrhrh i V230LA20A CROWBAR 130pF 2kV 2 5kVA A i U I I 1 TUBE DECK RF SECTION i BLOWER 12VDC o C 31 62 Heater JP2 TUBE DECK amp WATTMETER TUBE DECK BLOWER LED ese HVRET GND 380V 380RET brown JP1 CONTROL PCB MAINS PCB Sw Q Q POWER ON 250V 10A b b r a o 6 w k n KBD surrows a LEDs COVER INTERLOCK 250V 10A 4CX800A 61 C2 GU74B p 2 2n 3kv 2 2n 3kv Bottom View I a c k JP1 1 8MHz position CONTROL PCB SIA S1B SIC 6 3 0 200 240V rear view front view front view MAINS PCB 10A 100 120V RFC 10uH RFC3 22uH KEY IN O Rear Panel Cb4 d 10n 500V AC LINE CORD 100 240VAC 8 taps Fig 5 1 ACOM1010 Simplified Schematic Diagram
27. ss the Al A2 button when transmitting NOTE When you intend to have a short operating break it is better to place the amplifier in the standby mode rather than turning it off Tube life is shortened by repeatedly turning it on and off After the warm up period is complete the OPER LED stops flashing and remains illuminated green 4 2 Changing Operate and Standby Modes The OPER button changes between two modes When the green light above the button is illuminated the amplifier will remain ready to operate even automatically returning from standby after a high drive protection trip That is after a protection trip e g from an overdrive event the amplifier will normally shift to the STBY mode for several seconds but it will automatically return to the OPER mode after that This is the Auto Operate feature Alternatively the OPER button may be depressed manually to go to and remain in the STBY mode such as when you leave the station for a while The green LED goes off and the Auto Operate function is suppressed temporarily Pressing the OPER button again restores the Auto Operate feature 4 3 RTTY Mode Select the RTTY mode to operate continuous duty modes such as RTTY SSTV or other data modes The LED indicator above the RTTY button illuminates and the amplifier operating parameters are changed to reduce tube dissipation In the RTTY mode the amplifier output power is reduced to a maximum of 500 W There is no need to adjust
28. tuning when changing between RTTY and normal modes CAUTION To avoid damage not covered under warranty do not change modes during transmission That is do not change to or from RTTY or any other mode when transmitting 4 4 Antenna change By pressing the Al A2 button the amplifier output is switched between the two corresponding antenna outputs ANTI and ANT2 The lights above the button indicate the current antenna selection CAUTION To avoid damage not covered under warranty do not change the antenna during transmission 4 5 Tuning Tuning is possible only in the OPER mode a Preliminary information Tuning the amplifier involves a procedure of matching the impedance of the antenna and transmission line to the amplifier tube s characteristic load resistance This will ensure maximum plate efficiency and RF gain at nominal output power with minimal distortion and spurious output Note that REFLECTED POWER readings depend on the antenna and transmission line impedances only and not on amplifier tuning If the load impedance is not a nominally resistive 50 Ohms the REFLECTED POWER reading will always show a reading no matter what the tuning settings Proper tuning is always necessary however and will allow you to operate at a high power level without distortion or any danger to the amplifier Note also that the real OUTPUT POWER presented to the load the antenna and transmission line is equal to the difference between the F
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