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ACOM 1000 User Manual ( oper_man_eng_a1000)
Contents
1. T R sequencing Antenna relay contacts including RF power induced in antenna from another nearby transmitter Antenna matching quality Reflected power RF arcs including in antenna system Overdrive d Signatures of the amplifier internal status are stored in a nonvolatile memory for the seven most recent auto protection trips e Dot matrix backlighted alphanumeric LCD with bargraph for forward peak power and text messages to the operator f Measurement and constantly monitoring of 12 most important parameters of the amplifier via LCD g Menu selectable LCD Backlight and Contrast h Tube a single 4CX800A GU74B high performance ceramic metal tetrode of Svetlana with plate dissipation of 800W grid driven forced air cooling 7 3 Storage and Shipment CAUTION Should you need to transport the amplifier use the original packing as described below First switch off the amplifier Pull the mains plug out of the outlet Disconnect all cables from the rear panel of the amplifier remove the ground connection the last Finally pack the amplifier in its original carton a Storage environments the amplifier can be kept packed in dry and ventilated unheated premises without chemically active substances acids alkalis etc in the following climatic environment 21 Temperature range 40 to 4 70 degs Celsius Humidity up to 75 35 degs Celsius b Shipping Size and Weight W590mm x D430mm x H
2. 50 54MHz better than 66dB below rated output f Input and Output Impedances Nominal value 50 Ohm unbalanced UHF SO239 type connectors Input circuit broadband VSWR less than 1 3 1 1 8 54MHz continuously no tunings no switching Bypass path VSWR less than 1 1 1 1 8 54MHz continuously Output antenna impedance matching capability VSWR up to 3 1 or higher g RF Gain 12 5dB typically frequency response less than IdB 50 to 60W drive power for rated output h Primary Power 170 264V 200 210 220 230 amp 240V nominal taps 100 110 amp 120V taps on request 1096 15 tol 50 60Hz single phase 2200VA consumption at rated output i Complies with CE safety and electromagnetic compatibility requirements as well as FCC regulations 10 amp 12m bands lock provided I Size amp Weight operating W422mm x D355mm x H182mm 22kg m Operating environments Temperature range 0 50 degs Celsius Humidity up to 7596 35 degs Celsius Height up to 3000m above sea level without output deterioration 20 7 2 Functions a Antenna Impedance Matching Process plate load True Resistance Indicator TRI aided b T R System QSK operation with built in vacuum RF antenna relay special quiet installation c Protections Cover interlock for operator s safety Inrush power on current control High voltage control grid screen grid and plate currents Exhaust air temperature
3. Contrast and Backlighting control l6 5 2 Auto Operate enabling and disabling l6 5 3 Reading Auto protection Signatures l6 6 MAINTENANCE 5 00 RR RN KTN AIC RR RTK NN AN 17 6L CIMA A EE UH OH E eee ea Z 17 6 2 Fuses Replacement 17 6 3 Tube Replacement a5 AAA NA 17 6 4 The ACOM 1000 Simplified Schematic Diagram 17 6 5 Ireubleshootifig sseni nox psi nace cett citas e Res 18 7 SPECIFICATIONS c creen RE R RR OPER Ix oq Rok hor RTE Kea 20 Z L Parameters TTT 20 7 2 IFuBGEIODS sre v rere ra ea RC Eo aded sr doc d gene ates 21 7 3 Storage and Shipment a 6 oc ce oh Gok Oe A RACE FTO Pax E SCR n 21 Il GENERAL INFORMATION l 1 Introduction and Description This manual explains the installation operation and maintenance of the ACOMI000 HF 6 meters linear amplifier The ACOM 1000 is a complete and self contained linear amplifier that covers all amateurs bands from 1 8 through 54MHz and provides over 1 000W output power with less than 60W exciter drive Antenna VSWR up to 3 1 is acceptable at full power Tuning is substantially simplified by a plate load True Resistance Indicator TRI and by an automatically controlled input attenuator Operating parameters are displayed by a multi functional backlighted Liquid Crystal Display Full break in transmit receive switching
4. output relay closed ORC logic C arc fault ARCE logic D control grid current too high GIC logic E 24VDC power supply error PSE logic F low airflow LAIR logic For instance ATRAB in the first group would mean that the last auto protection 1A tripped by the antenna relay tests made during Tx Operate mode TR4 and the output relay closed ORC signal was failing B The next five groups of symbols carry information about the analogue and logic values as measured by the micro controller at the moment of auto protection trip Additional information is available from ACOM or from your dealer on how to interpret these values Using an EXCEL APPLICATION available from ACOM or your dealer free of charge and a PC you can decode these signatures easily by yourself In case it is necessary to ship the amplifier please see S 7 3 7 SPECIFICATIONS 7 1 Parameters a Frequency Coverage All amateur bands 8 54MHz extensions and or changes on request b Power Output 1000W PEP or continuous carrier no mode limit In continuous carrier modes RTTY etc for transmissions longer than 15 minutes up to several hours depending on ambient temperature the external auxiliary fan must be mounted c Intermodulation Distortion Better than 35dB below rated output d Hum and noise Better than 40dB below rated output e Harmonic Output Suppression 1 8 29 7MHz better than 50dB below rated output
5. OSK is standard l 2 Owner Assistance If assistance is needed you should contact your local dealer first If you still have an issue you need to discuss with one of ACOM s specialists the contact information is as follows fax 359 2 920 96 56 tel 359 2 920 96 55 e mail acom mail orbitel bg or acom aster net or by mail bul Gornobanski Nr 151 1330 Sofia Bulgaria 1 3 Equipment Supplied The ACOM 1000 amplifier and this manual are shipped in a cardboard carton 1 4 Features e Easy to operate The TRI is a powerful tuning aid which together with the automatically controlled input attenuator helps the operator to quickly and precisely match antennas 5 10 seconds typically The auto operate function when enabled maintains the amplifier in OPERATE mode for you thus saving manual operations and time e No heavy outboard antenna tuners required for antenna VSWR up to 3 1 and higher on some bands Your amplifier will perform the functions of an antenna tuner thus enabling you to change antennas faster and use them over a wider frequency range saving tuning time e Anamplifier that is both user friendly and that looks after itself It is designed to safely withstand up to 500W reflected power up to 100 milliseconds duration of drive spikes drive RF tails after a PTT or KEY release operator s inadvertent tuning errors etc It would also not cease to function with a soft AC line and would deliver more than half power
6. at only 7596 of nominal mains voltage It would withstand up to 10 milliseconds down to zero voltage drops and up to 15 line voltage spikes which is important particularly when used at field days DXpeditions and other portable events e LCD comment display All amplifier status indications are explained via detailed text displayed on the dot matrix backlighted liquid crystal display LCD The upper line s strip on the LCD always reads directly peak forward power LED indicators are provided for OPERATE attenuation on and ON OFF conditions e Easy maintenance Signatures of the amplifier internal status are stored in a nonvolatile memory for 7 most recent auto protection trips This information can be forwarded to your dealer for diagnostics Using an EXCEL APPLICATION available from ACOM or your dealer free of charge and a PC you can decode the signatures by yourself too e Less noise in the shack the input bypassing and the vacuum antenna relays are virtually silent even in QSK CW mode due to their special mounting e Less QRM and improved Electro Magnetic Compatibility during tuning Antenna matching can be achieved in less than 10 seconds at a quarter of nominal output power e Operates without special signals from the transceiver ground on TX and 60W RF drive power are sufficient e Broadband input matching circuit resulting in very good load to the transceiver over the entire spectrum from 8MHz up to 54MHz e Use
7. copied concerning every one of the 7 memorized events from A 1B through 7A 7B To decode the signatures please see S 6 5 Troubleshooting NOTE After every signature listing the tube warm up time is reset to 50 seconds regardless of the time being in OFF LINE state 6 MAINTENANCE If no characters are seen on the LCD at power on maybe its contrast needs adjustment see S 5 6 1 Cleaning WARNING Do not use solvents for cleaning they may be dangerous both for you and for the amplifier paint or plastics Do not open the amplifier Cleaning of the amplifier outer surface can be done with a piece of soft cotton cloth lightly moistened with clean water 6 2 Fuses Replacement If it is necessary to replace the mains fuses use only standard ones The two Primary Mains Fuses of the amplifier are located on the rear panel Fig 2 1 They are 10A 250V Quick blow 1 1 4 x 1 4 inch Cartridge Fuses Size 0 Ceramic Besides the primary fuses on the MAINS PCB inside the amplifier there are two more small glass fuses bx20mm 100mA and 2A slow blow type which are not replaced by the user Should one of these fuses be blown it may be indicative of other failures This is a complex and potentially dangerous operation For this reason we recommend this work be carried out by a trained service technician 6 3 Tube Replacement A single 4CX800A GU74B high performance ceramic metal tetrode manufactured by Svetlana is employ
8. must be accomplished in the order described below before you apply mains voltage to the amplifier WARNING Note that the grounding system may have to withstand currents over 10A 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 4mm AWG II or SWG 13 53 5241 F SI EB3 Eam 5 2 458 NEXML ML 19 FEL H RRR NZ n aom ma UT ria a Lr AnaL Fig 2 Connections a First connect the ground stud of the amplifier on the rear panel marked GND to the station s grounding system Fig 2 b Connect a coaxial cable with a PL 259 plug from the transceiver output to the amplifier rear panel RF INPUT socket CAUTION 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 It must handle the increased power safely particularly on the 10 and 6 meters bands We recommend that you use RG213 or better Check the same for the antenna selector and tuner as well as the antenna itself especially multi band trap antennas c Connect a coaxial cable from the amplifier output on the rear panel marked RF OUTPUT with a PL 259 plug to the antenna selector or tuner or to the antenna for the respective band d Run a cable terminated in a Phono RCA connector from the transceiver socket
9. providing ground on transmit to the amplifier rear panel KEY IN socket NOTE Your amplifier will not work if KEY IN is not connected properly Transceiver producers give different names to this output and they are for instance TX GND SEND T R LINE 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 e The KEY OUT socket on the rear panel provides an extra control signal from the amplifier to the transceiver It could be used to improve the transmit receive switching safety If your transceiver has a suitable input that disables transmission we recommend that you connect it with a cable terminated in a Phono RCA connector to the KEY OUT socket of the amplifier Transceiver producers give different names to this input and they are for instance TX INHIBIT MUTE LINEAR etc Check your transceiver s manual or consult your dealer If your transceiver does not have such input don t worry the amplifier will function normally as well and then the KEY OUT may remain unused f Preparation of wall outlet for the amplifier WARNING If your amplifier is only fitted with one mains fuse it is suitable for 0 220 240 VAC electricity supplies ONLY these supplies are standard in the European Community Your dealer will check that your amplifier is correctly fused before it i
10. than 500W reflected 700W output power when antenna VSWR exceeds 4 5 1 CAUTION Using a feeder of coaxial cable at VSWR gt 3 1 on HF and particularly on the 10 and 6 meters bands is not recommended At such high values of VSWR the high voltages high currents and heat associated with line losses risk to permanently damage your coaxial cable or antenna switch Update tuning periodically even if you have not changed band or antenna in particular when a significant change in the environment occurs snow ice newly appeared or removed massive objects alien wires nearby etc that would cause significant changes in the antenna impedance NOTE If you use more than one antenna per band it is necessary that you select the proper antenna BEFORE the next step Retune after selecting a different antenna for the same band since both impedances may differ substantially unless their VSWR is excellent i e below 1 2 1 for both CAUTION Do not switch the BAND switch knob while transmitting with the amplifier Hot switching while transmitting will eventually destroy the band switch not covered by the warranty CAUTION When tuning do not apply continuous drive longer than 3 minutes and after that pause 2 minutes for tube cooling We recommend that you tune up at the center frequencies of the preferred frequency band First select the band switch never with RF applied Then use table 4 in order to achieve an approximate
11. 305mm 25kg c Shipping environments all types of transportation including aircraft baggage section up to 12000 meters above sea level GD ACOM 22
12. 4 1 Using TRI tuning aid Please note also that the TRI mark will not appear until at least 5W drive is applied and at least 20W forward power is achieved If for some reason matching cannot be accomplished successfully check BAND switch and antenna selection Then check the antenna VSWR at same drive frequency d Tuning hints While turning knobs you ll note that both tunings would be virtually independent This is a benefit of the TRI The plate load resistance increases to the right and decreases to the left of the TRI center The center of the scale corresponds to the proper LOAD capacitor tuning which presents an optimum load resistance to the tube If you tune to the right you ll obtain more gain but less undistorted output power will be attainable You may prefer to use this hint when your drive power is insufficient or when you need less output but better efficiency for instance at heavy duty modes RTTY SSTV etc where less heat is wanted Tuning to the left of the center would lead to the opposite 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 as its cathode would be faster exhausted 14 You might use the off center tuning hint also to compensate for mains voltage variations in order to maintain tube efficiency tune to the right when mains is higher or tune to the left if it s lower than the nominal voltag
13. A 7B The meaning of the first group is as follows a nA the number of the trip b Next three symbols mean the following PNO tests made during Power On procedure before HV is ON PN2 tests made during Power On procedure after HV is ON and second after step start is closed SBO tests made in Stand By during the warm up period or while entering Stand By from Operate SB2 tests made during Stand By after the warm up period PRO tests made while entering Operate PR2 tests made during Operate TRO antenna relay tests made while changing from Tx to Rx during Operate TR2 antenna relay tests made while changing from Rx to Tx during Operate TR4 antenna relay tests made during Tx Operate mode TR6 antenna relay tests made during Rx Operate mode c The last symbol of the first group designates the kind of the input parameter which caused the protection to trip The abbreviations in brackets below are the signal names designations according to the CONTROL PCB electrical schematic diagram and signal type peak forward power pfwd analogue 2 reflected power rfl analogue 3 input drive power inp analogue 4 peak anode alternate voltage paav analogue 5 screen grid current g2c analogue 6 plate current ipm analogue 7 high voltage hvm analogue 8 exhaust air temperature temp analogue 9 drive power exists GRIDRE logic A antenna power exists PANT logic B
14. HF 6m LINEAR AMPLIFIER COMA EN EE 70 40 so 60 LOAD BAND 40 ji 60 14 30 Nul r zo 7 10 1821 ur 7 20 X E 80 Z M R O aii mE A K 18 y 50 MN MAK 107 To 207 Sao Um No HF 6 LINEAR AMPLIFIER Table of Contents Il GENERAL INFORMATION x x lt lt lt lt ccc cee ee eee cece eens 3 l I Introduction and Description 3 l 2 Owner Assistance verdad d ue eade aUe Pint de E d qe aa Dao A 3 1 3 Equipment Supplied sara ay eee ae Ce od ak qae s CA V poc d 3 ESE ELA S OR RUN A AR Oe gen Nje E as 3 5 Safety Considerations Explicit Definitions 00 02 0000 0 4 Z INSTALLATION 4 es rm A A CC 6 2 1 Unpacking and Initial Inspection 6 2 2 Line Voltage Selection 14x a ii a adi 6 2 3 Amplifier Location Selection 0 cece eee eee eee eens 6 274 Cohnectloris ade edi 2h des eem TAS M Ca hoe a I d a 7 2 5 Installation of External Fan 0 cece eee eee eee ees 9 3 POWER ON CONTROLS AND INDICATORS 9 4 OPERATION s ve ads Gas ORLA aT E FANE Saws lI 4 Turning ON and OFF uj da ose dei oh do pee AA EC Il 4 2 Changing Operate and Standby Modes 12 de TUNNE A OR E RON 12 4 4 ON LINE Information Screens and Control Functions 15 4 5 Auto Protection System 3 sin reed ORAE VOR Oe awe da RR aed ae A 15 5 OFF LINE OPERATION cocinar EA 16 5
15. a Preliminary information Tuning the amplifier is a procedure of matching the impedance of the currently used antenna to the optimum tube load resistance This will ensure maximum plate efficiency and RF gain at nominal output power with minimum IMD at that Please note that the REFLECTED POWER readings and the measured VSWR depend on the load impedance only and not on the amplifier tuning If the load impedance is different from 50 Ohm pure resistive nominal the REFLECTED POWER reading will always indicate reflected power presence even at excellent tuning The proper tuning will allow you to operate at greater power without distortion or danger to the amplifier Note also that the real OUTPUT POWER in the load is equal to the difference between the FORWARD and REFLECTED readings For instance at a reading of FORWARD 1200W and of REFLECTED 200W the real OUTPUT POWER is 1000W into a 2 6 1 VSWR load At very high VSWR no antenna or badly mismatched antenna the FORWARD and REFLECTED readings will be almost equal while the real OUTPUT POWER the difference between them will be practically zero The amplifier can operate safely if the following rule is obeyed REFLECTED POWER lt 500W Matching is assured for loads with VSWR up to 3 1 Nevertheless for some loads and bands matching is possible at even higher VSWR For instance you ll get a REFLECTED POWER soft fault protection trip at full scale 1200W forward with more
16. appear on the LCD Fig 3 I HF ts LINERA AMPLIFIER Fig 3 ACOM1000 Display and Control You ll note that the upper line of the LCD always reads directly peak forward power even while the tube is not driven The 1200W scale resolution is 10W per bar dots division weight is 60W and figures are multiple to 300W Note also that levels below 20W may be not detected NOTE If the characters on the LCD are dim or not readable please follow the method of LCD contrast and backlighting adjustment described in S 5 In this position called OFF LINE hereafter only the micro controller is operational while the amplifier itself is still turned off the tube is not powered at all The control of the amplifier is accessible during OFF LINE and ON LINE states each having several information screens and control functions see Fig 3 2 POWER ON S 3 y D ON OFF E OFF LINE S 5 qJ ON S 4 1 D ON L S 4 F 4 NEXT or PREV PREV NEXT PREV NEXT y 2sec PREV NEXT S 5 I OPER S 5 3 INFORMATION S 4 4 Tuning S 4 3 LCD adj S 5 I Contrast 1 9 PREV List of Forward power TRI Back light 1 5 NEXT Auto Prot Reflected power y Signatures Output Power l PREV NEXT Antenna VSWR PREV NEXT Drive RF Power Auto Operate 5 2 PREV NEXT S 5 2 RF Power Gain Auto Operate OFF PREV Plate Current Auto Operate ON NEXT High Voltage Plate RF Peak Screen Current DC Power Input Exh Air Temp Fig 3 2 Inform
17. ation Screens and Control Functions Structure The OPER button alternatively changes operate and standby modes S 4 2 while ON LINE Please note that Auto Operate might be enabled The same button activates signature list while OFF LINE The PREV and NEXT buttons change information screens or select control functions S 4 4 for both OFF LINE and ON LINE The ON OFF button alternatively switches OFF LINE and ON LINE states of the amplifier You can proceed in one of two directions a You can use the OFF LINE information screens and control functions They refer to the auto protection signatures list LCD contrast and backlighting control as well as the Auto Operate feature This is described in S5 b You can turn on the amplifier and begin the warm up sequence After 2 5 minutes you may tune and start operating the amplifier and you can use the ON LINE information screens or control functions see below d OPERATION Operation of the amplifier is simplified due to the TRI tuning aid Auto Operate function and automatic protection system so you ll be able to begin using it immediately after the installation However to make full use of amplifier s potential and to fully configure it to your local conditions we recommend that you thoroughly read the following information There are 14 ON LINE information screens which can be selected by pressing repeatedly the NEXT or PREV buttons see fig 3 2 Their purpose and method of use are des
18. ator s attention a The first degree of protection is issuing a warning message only without any influence on the transmitting process This might be for instance Reduce Drive Plate Current etc You could continue to transmit under such conditions but you are close to a trip threshold b The second degree of protection is a trip in standby mode Soft Fault You ll get an appropriate message for instance GRID CURRENT All Soft Fault messages are marked with two asterisks on both screen edges The message remains on the display until you press any button or auto operate function returns to operate mode automatically The Soft Faults are of such kind where you can correct exploitation conditions operatively using less drive improving VSWR etc c The third degree of protection is a trip in off mode Auto Protection You ll get the corresponding signature see S 6 5 Troubleshooting If you cannot guess what is the reason you may try to turn the amplifier on again in order to check whether it s not an accidental condition If the problem persists you ll need to contact your dealer see S l 2 NOTE The 6dB input attenuator is automatically inserted about second after a bad tuning is detected at drive levels above 20W It is switched off at every PTT release unless inserted manually 5 OFF LINE OPERATION There are two control functions and 4 information screens available in this state of the amplifier You can
19. c shock NEVER TOUCH AN ANTENNA during transmission 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 AIR INTAKE rear panel and EXHAUST top cover areas of the amplifier 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 Otherwise you may endanger your or other s health and life or 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 CAUTION To avoid damage not covered under warranty read the Installation Section 2 of this operating manual carefully If you have any doubts about the installation operation or safeties of the amplifier please consult your dealer 2 INSTALLATION 2 1 Unpacking and Initial Inspection NOTE Before you start to install the amplifier thoroughly read this manual First carefully inspect the cardboard carton and its contents for physical damage If damage is noticed notify your dealer immediately Delay may infringe carrier s warranty conditions Keep all packing for possible future transportation 2 2 Line Voltage Selection CAUTION To avoid damage not covered under warra
20. control the LCD contrast and backlighting or enable disable the Auto Operate feature You can also list the auto protection signatures The tube is not powered at all only the micro controller is active during these operations 5 Contrast and Backlighting control Press the PREV NEXT buttons simultaneously and hold them for two seconds The back lighting of the LCD will light and the Contrast B Light screen will appear on the bottom line Control the contrast of the LCD using the PREV button in steps from to 9 Control the backlighting of the LCD using the NEXT button in steps from to 5 Press shortly the PREV NEXT buttons in order to reach the auto operate function see next S 5 2 or leave buttons unused for 20 seconds if you want to accept these selections only in order not to change Auto Operate inadvertently 5 2 Auto Operate enabling and disabling When enabled this function will save manual actions and operating time for you It will automatically execute OPERATE commands every time when needed The OPER button will be still functional so you ll be able to change to standby and back to operate manually at any time After returning to operate the first time by pressing OPER button again the auto operate feature will be restored In order to enable or disable the auto operate at all after a contrast and backlight selection see the previous S 5 1 continue with pressing shortly the PREV NEXT buttons Th
21. cribed in the next five sections 4 through 4 5 4 1 Turning ON and OFF In order to turn on the amplifier while the Main Power Switch located on the rear panel is on press the red ON OFF button on the front panel right bottom corner and hold it on for about second The LCD backlight will light and the ON OFF LED indicator above the button will change from red to green You ll hear the blower start first at high speed then slow down After successfully passing the initial self tests the ON OFF LED begins flashing green while the following inscription on the LCD remains lit WARMING UP nnn s nnn above is the number of seconds remaining to readiness for operation A tube warm up period of 2 5 minutes follows During this time the amplifier remains in standby mode so you can continue operating with the transceiver Pressing either the PREV or NEXT buttons during this period will result in changing the screen to one of the 14 available information screens described in S 4 4 below This action will not influence the warming up process so you may pass through all information screens for instance to monitor the High Voltage value or the Exhaust Air temperature You can also return to the old one to see how many seconds are still needed for the tube s heater NOTE When you intend to have a short operating break it is better to leave the amplifier in standby mode instead of turning it off Tube life is shortened by repeatedly turnin
22. e Auto Operate screen will appear on the bottom line Use the PREV button to select OFF or NEXT to select ON Press shortly the PREV NEXT buttons again to accept and return NOTE If LCD back lighting or contrast are too low thus no characters are seen on the LCD execute S 5 first to obtain a readable display All selections you make are stored in the nonvolatile memory of the amplifier and are used at the next power on If no selection is made for 20 seconds the currently existing selection is accepted and the function is left automatically 5 3 Reading Auto protection Signatures On every Hard Fault protection trip of the amplifier signature information is stored in its nonvolatile memory The 7 most recent auto protection trip signatures related to the amplifier internal status are stored there which you can copy and forward to your dealer for diagnostics In order to read and to copy them press the OPER button while OFF LINE The backlighting of the LCD will light and you ll see the beginning of the signatures list Use NEXT and PREV buttons to navigate through 7 pairs of screens For each auto protection trip there is a pair of information screens beginning with nA and nB where n is the number of the event nr is the last nr 7 is the oldest one A and B mark the first and the second part of an information screen pair 16 Two lines three groups by six symbols 36 symbols in total are to be
23. e Please see S 2 2 Line Voltage Selection for more than 1096 difference from the nominal 4 4 ON LINE Information Screens and Control Functions a Besides the Warming Up and TRI described above in S 4 through S 4 3 you have 12 more Information screens available They are as follows Forward Power Reflected Power Output Power difference between forward and reflected Antenna VSWR Drive RF Power RF Power Gain Plate Current High Voltage Plate RF Peak Screen Current DC Power Input product of plate current and high voltage and Exhaust Air Temperature Celsius and Fahrenheit scales You can use them to monitor the technical state of the amplifier and the associated parameters in digital form Selection is made by the PREV and NEXT buttons You may change them in a closed loop while the amplifier is used and controlled in operate and standby modes changes transmit and receive without any influence by the measuring process b You can control LCD adjustment and Auto Operate feature selection also while ON LINE The method is the same as it is described for OFF LINE so see S 5 and S 5 2 for details 4 5 Auto Protection System When any abnormal condition is detected the amplifier will evaluate the risk and may use three different degrees of protection depending on the nature of the problem Each event is accompanied by a text telling you the reason The backlight of the LCD is flashed meanwhile in order to attract the oper
24. ed in the amplifier Replacement is a complex and potentially dangerous operation For this reason we recommend this work be carried out by a trained service technician 6 4 The ACOM1000 Simplified Schematic Diagram See Fig 6 ACOM1000 Simplified Schematic Diagram The 4CX800A GU74B Svetlana high performance ceramic metal tetrode V1 with plate dissipation of 800W is grid driven The input signal from the RF INPUT jack is passed through a broadband input matching circuit which comprises some components in the INPUT PCB and Rsw This circuit tunes out the input capacitance of the tube The swamping resistor Rsw is a termination load for this circuit and can dissipate up to 100W of RF drive power Cathode resistor Rc creates DC and RF negative feedback thus stabilizing the gain and equalizing the frequency response The varistor VSsg in the screen grid circuit protects the tube screen grid and voltage regulator in the events of a flashover 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 circuit comprises LPI LP2 LL CPI CP3 and CLI CL3 which form a classic Pi L network and suppress the harmonic frequency emissions This tank is switched and tuned over the bands by SIA SIC and the air variable capacitors CPI 2 and CLI 2 The output signal is fed through an additional VHF low pass filter for frequenc
25. g on and off the tube heater supply However if you unintentionally power off the amplifier it is best to switch it on again immediately When the pause is short up to minute and the cathode is still warm the warm up period is shortened significantly which reduces the waiting time and prolongs the tube s expected life After the indicated period expires the ON OFF button stops flashing and lights green constantly If the auto operate function is selected to ON see S 5 2 the green OPER LED lights too The last used one out of 14 information screen appears on the LCD for instance WARMING UP Ready The bargraph on the upper line always indicates the peak forward power as well as during OFF LINE In order to turn the amplifier off press shortly the red ON OFF button If you are not going to use the amplifier for a long time it is best to turn it off using the Main Power switch on the rear panel as well 4 2 Changing Operate and Standby Modes With the Auto Operate function disabled see S 5 2 the OPER button changes two modes alternatively When Auto Operate is ON the amplifier will be maintained to operate mode by default unless you use the OPER button manually to go to standby then Auto Operate is suppressed temporarily Pressing OPER again would restore the Auto Operate 4 3 Tuning Tuning is possible only in operate mode so press the OPER button in order to illuminate its LED unless Auto Operate is active
26. he 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 information precautions indications for cautions and warnings which must be followed by the user to ensure safe operation and to keep the ACOM 1000 in safe operating condition PRECAUTIONS The EXPLICIT DEFINITIONS described below apply to this operating manual WARNIN G notes call attention to a procedure which if not correctly performed could result in personal injury fire hazard or electric shock CAUTION 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 WARNING HIGH VOLTAGE The amplifier works with high voltages up to 3000V which are LETHAL Also for your safety pull the amplifier power plug out of the mains wall outlet and WAIT AT LEAST 30 minutes EACH TIME BEFORE you remove the cover of the amplifier Do not touch any part inside while the amplifier is open because some residual voltages may still be present WARNING HIGH VOLTAGE NEVER ALLOW ANYONE ESPECIALLY CHILDREN to push anything into holes in the case this will cause electri
27. ies above 55MHz Lfl Lf2 and Cf Then it is passed through the vacuum antenna relay KI wattmeter current transformer TAI and a high pass filter RFC4 Ca for frequencies below 00kHz to the antenna output The chokes RFC3 and RFC4 keep track of the antenna relay contact conditions and together with Ca prevent the plate supply from reaching the antenna RFC4 shunts it to ground if the DC blocking capacitor Cb3 fails The resistor Ra protects the amplifier from charging Electro static energy fed by the antenna The PLATE CAPACITIVE DIVIDER and RF WATTMETER are the main sources of information for the control circuit of the amplifier during the antenna impedance matching process The control circuit is based on the 80C552 micro controller from Philips All voltages are delivered from the MAINS amp LOW VOLTAGE and HIGH VOLTAGE SUPPLY PCBs The control grid screen grid and plate currents plate cooling airflow temperature reflected power etc are permanently monitored Many software derived protections are based on this information Detailed electrical schematic diagrams are available from ACOM or from your dealer on request 6 5 Troubleshooting See S 5 3 for the method of reading the auto protection signatures You can decode them using the information below The signatures are structured in two lines three groups by six symbols for every one event of auto protection The last event is numbered as A IB pair of lines and the oldest one is 7
28. nty check carefully if the voltage for which the amplifier is set corresponds to your mains nominal voltage Normally the amplifier is supplied set for a nominal line voltage of 240V There might be exceptions in cases of special delivery and then the voltage set is noted in the Table of Individual Data Table 2 1 If your power line has a different nominal voltage it will be necessary for you to contact your dealer AMP s n Tube s n Voltage Selector VAC Table 2 1 ACOM 1000 Individual Data 2 3 Amplifier Location Selection CAUTION The weight of the unit is about 22kg which should preferably be handled by two persons Position the amplifier near the place where it will be used You ll need an easy access to the command knobs and indicator s area as well as to the rear panel cabling No magnetic field sensitive devices should be located next to the right side of the amplifier as its power transformer is located there It s best to position it to the right of your transceiver No temperature sensitive devices should be located above the exhaust hot air area so don t push it under a shelf You may prefer to use the bottom scales of both variable capacitor knobs TUNE and LOAD if you install it on a shelf DO NOT OBSTRUCT AIR INTAKE rear panel and EXHAUST top cover areas of the amplifier Keep a minimum distance of 10cm 4 inches to the intake and 50cm 20 inches to the exhaust 2 4 Connections Connection to your station
29. plifier s mains plug into the wall outlet prepared for it The amplifier remains switched off 2 5 Installation of External Fan This fan Fig 2 1 is not necessary in SSB and CW modes nor in continuous carrier modes RTTY SSTV etc with carrier down times of maximum 15 minutes and a subsequent pause of 3 minutes For higher duties or ambient temperatures the fan is recommended The auxiliary fan 92x92mm must be brushless type 2 5W 24VDC It may be installed by your dealer or by the manufacturer on request 3 POWER ON CONTROLS AND INDICATORS CAUTION 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 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 in a cold shack 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 2 2 and table 2 1 After following all instructions in S 2 you can turn ON the main power switch marked LINE on the rear panel Fig 2 1 The red LED indicator above the red ON OFF button located on the front panel must light red and a black inscription ACOM1000 will
30. preset for both TUNE capacitor and LOAD capacitor knobs Band MHz Tune Knob Dial Load Knob Dial 1 8 2 3 5 4 7 7 3 10 1 10 2 14 14 35 18 18 2 21 21 45 24 9 25 28 29 7 50 54 Table 4 1 Approximate tuning preset b Selecting the plate load True Resistance Indicator TRI tuning aid You may select TRI scale in three different ways By pressing simultaneously for a moment the PREV NEXT buttons This will insert a 6dB attenuator between the driver and the amplifier s input the ATT LED will light so you ll not need to reduce the drive power during tuning Press PREV NEXT buttons momentarily again to switch the attenuator off the input and to return to the old screen If you use any of PREV or NEXT buttons only the attenuator would be switched off too but the information screen would change to respectively previous or next By pressing repeatedly either PREV or NEXT button whichever is nearest until you reach the TRI scale This will not insert the attenuator so you ll have to use less than 20W drive unless the amplifier is nearly correctly tuned otherwise the next step would be executed automatically By simply applying a normal working 50 60W drive power while the amplifier is not yet tuned 13 This will automatically invoke the TRI tuning aid and will insert the input attenuator the ATT LED will light after one second The attenuator will be switched off and the old screen will be returned au
31. s a single 4CX800A GU74B Svetlana high performance ceramic metal tetrode with plate dissipation of 800W forced air cooling grid driven e Permanent monitoring and protection of plate and grid voltages and currents as well as of the exhaust air temperature The Bias Optimizer decreases the heat dissipated from the tube and there is automatic protection against overheating in accordance with the specifications of the tube producer e Anoutput RF Arc protection is employed It safeguards the amplifier antenna antenna selector and tuner against severe damage in case of possible break down e High voltage power supply inrush current protection which eliminates the danger of affecting sensitive devices connected to the same mains circuit important when used portable The amplifier can be configured for 5 nominal line voltages 200 210 220 230 and 240VAC 50 or 60Hz 100 110 and 120VAC on request e Continuous measuring and or selectable monitoring of 2 most important parameters of the amplifier exciter and antennas via LCD e The amplifier can be shipped with 10 and 12 meters capability disabled as required by the FCC for US users Contact your dealer about enabling those bands 1 5 Safety Considerations Explicit Definitions The ACOM 1000 HF 6 meters Linear Amplifier is a Safety Class unit 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 t
32. s 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 supply plug which meets the Safety Class units 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 WARNING Before connecting the amplifier to your mains supply be sure that the supply is correctly wired and is adequate for the current drawn by the amplifier up to 10A 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 1 5mm AWG 15 or SWG 17 Check if the respective fuses can handle current up to 10A as well as if the voltage corresponds to the voltage for which the amplifier is set S 2 2 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 rear panel is in OFF position and insert am
33. tomatically after you release the PTT shortly If you have achieved meanwhile a nearly good tuning the attenuator would not be inserted again If the old screen was the same TRI selected manually earlier you ll then be able to precisely tune the amplifier also at nominal power without changing drive at all Use this hint to shorten the tuning process duration c Tuning Procedure While a continuous CW signal at the desired frequency is still applied Look at the upper scale forward power obtain maximum power using the upper TUNE knob Look at the lower Load Cap scale and turn the lower LOAD knob in order to center the triangle marker at the mark Release the PTT shortly in order to disable the attenuator then repeat both steps at nominal power Always finish by peaking with the TUNE knob NOTE Appearance of an arrow on either left or right TRI scale edges means that the LOAD knob is too far from the proper position To correct for this turn the LOAD knob to the prompted direction until the triangle marker appears inside the scale field I III MHIN III Ae d o x x S a V no marker marker is a far left marker is a far right marker inside LOAD is tuned use TUNE knob for turn LOAD knob turn LOAD knob turn LOAD knob turn TUNE knob to max P to get any pointer to right until pointer to left until slightly left to peak Forward marker marker inside marker inside center it Power amp finish Fig
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