OM POWER OM1500 Instruction Manual Download

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Instruction Manual

OM1500

SHORTWAVE PLUS 50 MHz

POWER AMPLIFIER

OM POWER, s. r. o. 930 30 Báč 126

SLOVAKIA

E-mail: [email protected]

Summary of Contents for OM1500

Page 1: ...Instruction Manual OM1500 SHORTWAVE PLUS 50 MHz POWER AMPLIFIER OM POWER s r o 930 30 B 126 SLOVAKIA E mail om power om power com...

Page 2: ...6 3 GENERAL DESCRIPTION 7 3 1 HF part 7 3 2 Power Supply 8 3 3 Safety Devices 8 4 INSTALLATION 8 4 1 Grounding 9 4 2 Coaxial Cable 9 4 3 Control Cable 9 4 4 Main Supply 10 4 5 Cooling 10 5 OPERATION...

Page 3: ...ation of Fault Conditions 29 6 2 Fuse Replacement 32 6 3 Tube Replacement 33 6 4 Cleaning 33 7 APPENDIX 34 7 1 Primary AC voltage selection 34 7 2 Removing the HV transformer 35 7 3 Block Diagram of t...

Page 4: ...d do not expose this equipment to rain or moisture The OM1500 HF amplifier is neither to be used in a WET or HUMID environment WARNING Do not turn the amplifier on without having connected the ANTENNA...

Page 5: ...50 MHz and all modes It is equipped with one GS23B ceramic tetrode 2 2 Specification 2 2 1 Parameters Frequency Coverage Amateur Bands 1 8 29 7 MHz incl WARC 50 MHz Power Output 1500 W in SSB CW on HF...

Page 6: ...aracters Analog Wattmeter Double system meter for forward and reflected power measuring LED Indicators ON AIR amplifier in transmitting mode STBY standby mode FAULT failure switching off for abt 4 sec...

Page 7: ...it with an input impedance of 50 Ohms This adaptable input circuitry ensures a good input SWR better than 1 5 1 on all amateur bands The output of the amplifier is a Pi L circuit The ceramic capacitor...

Page 8: ...AC Factory setting is 230VAC If the AC voltage in your network is 220 or 240 Volts you need to set the correct value before first starting of the PA See part 7 1 for more information 3 3 Safety Device...

Page 9: ...sceiver is to be connected to the input of the amplifier via RG58 or similar cable For the connection between the power amplifier and the antenna RG213 or similar coaxial cable suited for high power i...

Page 10: ...ur dealer In such a case you should make the necessary changes using a licensed electrician WARNING Be sure that your power system is correctly wired and properly rated To use adequately sized and con...

Page 11: ...amplifier is moved from a cold place to a warm one because not visible condensation may develop and this could result in damage to the high voltage circuits of the PA CAUTION Never try to change ante...

Page 12: ...LEDs assists in tuning the amplifier WATMETER Analog double system meter for forward and reflected power measuring ON OFF Long press abt 1 sec to switch PA ON OFF RESET Short press to reset faults or...

Page 13: ...tput ANT1 ANT2 ANT3 ENT Confirm the selection More functions of S1 S4 buttons will be described in next parts of this manual 5 2 Preparation for operation The first necessary thing after connecting AC...

Page 14: ...time expires PA switches itself automatically to the STBY mode You have two possibilities now switch PA to OPER mode and start operation OR to go thru MENU and submenus to set display parameters some...

Page 15: ...ress 1Row button Go UP or DOWN to select desired parameter Press ENT to confirm selection There are 4 possible settings for the first line one bar graph or three pairs of different parameters Forward...

Page 16: ...right side press RIGHT button etc Second and third line programmable parameters are Forward Power Reflected Power Input Power SWR TUNE Turns of blower in Frequency Plate voltage Up Plate current Ip S...

Page 17: ...e EBS starts working Default EBS value is 1 watt We recommend using EBS ON Significant accompaniment of used EBS is temperature reducing To enter Settings menu go to MENU first then press SET button U...

Page 18: ...ults and warning messages are stored You can display particulary warning messages and particulary error messages See chapter 6 for more information regarding to warnings and faults occurrence There yo...

Page 19: ...UP or DOWN button to check software version Use UP or DOWN button to select Time ON parameter Press ENT to see total operating hours of the PA Press ESC to go back to the Service menu Use UP or DOWN b...

Page 20: ...voltage increases automatically during adjustment process grid voltage increases step by step also In the moment when Ip reaches 20mA adjustment stops Press ESC after stopping Use this procedure afte...

Page 21: ...DOWN button Press ENT to confirm selection Press ESC twice to leave Service menu Press ESC again to leave Menu 5 3 Operation mode CAUTION In STBY the amplifier is in bypass mode and your transceiver...

Page 22: ...eters and delivered tuning table see next part for more details Apply low input power and press PTT Check Analog wattmeter first Try to tune PA for maximum output power and minimum SWR Look at our exa...

Page 23: ...terrupt TX mode first Grid parameters and the blower speed are visible on different display Output power and SWR is visible on the Analog wattmeter too This double system meter helps quickly and clear...

Page 24: ...and LOAD capacitors according to the table Band Tune Load 1 8 60 67 3 5 65 35 7 42 78 10 76 11 14 60 35 18 60 40 21 32 67 24 50 47 28 25 62 50 21 88 NOTE Delivered tuning table was made for 50 Ohm lo...

Page 25: ...antenna connected to the wrong output In such a case SWR is too high error message appears Change antenna output using S4 button This is not an optimal result TUNE indicator must go between both arro...

Page 26: ...ate voltage drops to 2 55 kV and the heating voltage drops to 6 2V Proper operation mode of GS23 requires the plate voltage to be close to 3 kV all the time Pictures show the two problems First anode...

Page 27: ...D knob to get Is graph indicator within the boundaries Effect of included input attenuator is visible power output is low TUNE position third row is not a good Use LOAD knob to move it to the center I...

Page 28: ...all operation modes At optimal tuning and full output power a positive max 50mA current goes through the second grid CAUTION If the amplifier demonstrate any malfunctions during tuning or it does not...

Page 29: ...appears during the tuning or operation of the amplifier the safety circuits will block transmitting and FAULT LED starts blinking The amplifier stays in OPER mode After approx 1 sec the control circui...

Page 30: ...fault message Low output power appears You have to tune the PA correctly 2 Cooling error means that the blower stops running In that moment safety devices will swith PA immediatelly OFF only error mes...

Page 31: ...afety circuits reacted 3 times and then switched PA to STBY mode Permanent fault appears To return PA to the normal operation decrease Input power first then reset fault status and go back to the OPER...

Page 32: ...side the amplifier except of tube or fuses Substitution of parts may void intrinsic safety Manufacturer s contacts OM POWER s r o 930 30 B 126 SLOVAKIA Email om power om power com 6 2 Fuse Replacemeen...

Page 33: ...eplacing automatic BIAS adjustment must be done Read the Service menu 5 2 3 and see pictures on the page No 20 for more details If you are not comfortable to replace vacuum tube itself contact the man...

Page 34: ...e view on the opened OM1500 HV Transformer AC selector Remove the upper lid first On the right side of the PA next to the HV transformer there are two PCBs mounted On the left upper side of the front...

Page 35: ...kg about half and half Follow next steps to do it 1 Remove upper lid from the PA 2 Turn the PA on the left side transformer is up 3 Disconnect 3 connectors from the front board and 1 connector from th...

Page 36: ...o the rear board J1 Transformer primary wiring connector Four colour shrink foils 4 pole connector Connect to the front board J3 AC 55V in black foil 4 pole connector AC 20V in yellow shrink foil Conn...

Page 37: ...ype of connectors for transformer termination New WAGO connectors they have different colour for every contact This corresponds approx to the shrink foil colour of transformer terminals white yellow o...

Page 38: ...38 7 3 Block Diagram of OM1500 Power Amplifier...

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