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11 

 

5.

 

OPERATION 

 

WARNING! 

Before switching PA on, make sure that amplifier is grounded, antenna or dummy load is connected, 
and line cord is putted to the outlet. Be sure you selected AC input by 7.1. 

 

CAUTION 

Before switching PA on, check all connections between PA and TCVR. 

 

CAUTION 

Do  not  turn  PA  on  for  at  least  2  hours  after  unpacking  it  and  locating  in  its  operating  location. 
Especially  when  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 antenna output during a transmission to avoid warranty loss. 

 

NOTE 

When you decide to have a short operating break, place the amplifier to the standby mode rather than 
switch it off.   

 

5.1. 

Operation elements

 

There is couple of operational elements accessible or visible on the front panel. 

 

Содержание OM2000+

Страница 1: ...MADE IN SLOVAKIA OM2000 SHORTWAVE PLUS 50 MHz POWER AMPLIFIER WWW OM POWER COM OM POWER s r o 93030 B 126 SLOVAKIA Contact 421 905 321 410 e mail om power om power com...

Страница 2: ...1 HF part 6 3 2 Power Supply 7 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 11 5 1 Operation Elements 11...

Страница 3: ...2 6 2 Fuse Replacement 31 6 3 Tube Replacement 31 6 4 Cleaning 31 7 APPENDIX 32 7 1 Primary AC selection 32 7 2 Removing the HV Transformer 33 7 3 Block Diagram of the OM2000 Power Amplifier 34...

Страница 4: ...Impedance 50 Ohm unbalanced Maximum Output SWR 2 1 SWR protection Automatic switching to STBY when reflected power is 250W or higher Intermodulation distortion 32dB below nominal output Suppression o...

Страница 5: ...tting mode STBY standby mode FAULT failure switching off for abt 4 sec ON ON status 1 2 4 Features Manufacturer implemented some of the company s current development results with most wanted operating...

Страница 6: ...BYPASS safety switch under upper lid WARNING The OM2000 amplifier is neither to be used in a WET or HUMID environment nor to be exposed to RAINFALL WARNING Do not turn the amplifier ON without having...

Страница 7: ...es the user is to take proper actions to mitigate this disturbance CAUTION Read this manual carefully Fallow all of instructions during installation and operation to avoid damage to the amplifier not...

Страница 8: ...amplifier is using one 3 KVA toroidal transformer A soft start is provided using relays and resistors placed on the switch ON board The high voltage is made by combining 4 x 530V AC total abt 2950V DC...

Страница 9: ...Control board which is located on the chassis subpanel One of the important safety element is mechanical switch for AC blocking at opened amplifier 4 INSTALLATION NOTE Read this chapter carefully prio...

Страница 10: ...58 or similar cable For the connection between the power amplifier and the antenna RG213 or similar coaxial cable suited for high power is recommended All the INPUT and three OUTPUT ANT1 ANT2 ANT3 SO...

Страница 11: ...a licensed electrician WARNING Be sure that your power system is correctly wired and properly rated To use adequately sized and connected grounding system is also very important 4 5 Cooling CAUTION T...

Страница 12: ...and locating in its operating location Especially when 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 volta...

Страница 13: ...low at 100 and high at 0 on the scale TUNE LED Three 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 s...

Страница 14: ...itching main green switch to I Welcome message and then starting information appears on the display After switching main switch ON welcome message appears shortly Starting message shows which antenna...

Страница 15: ...the main switch green must be ON in order to switch the antenna Display information can be changed too Press S3 to do it There are 3 different display settings possible in the OM2000 To set display pa...

Страница 16: ...cond and third line are divided to the left and the right side editable independently To each of these positions one of the 15 different parameters should be set If you finish first line settings pres...

Страница 17: ...SWR TUNE Temperature Frequency Plate voltage Up Plate current Ip Screen voltage Us Screen current Is Screen current graph Grid voltage Ug Grid current Ig Heating voltage Uf 5 2 2 Settings menu Setting...

Страница 18: ...on to select EBS ON OFF Press ENT to enter EBS status settings Press ON or OFF to set status of EBS Press ENT to confirm selection Press ESC to go one level back Use UP or DOWN button to select EBS le...

Страница 19: ...rst mode The fan will activate at a fixed temperature programmed in uP Press ENT to confirm settings Type of supported TCVR and working frequency are visible on the display AUTO LED is ON Type of supp...

Страница 20: ...fety circuits activation also In the Service menu a value of EBS1 and EBS2 can be automatically adjusted This is used for example when it is necessary to make adjustment after replacing the tube Autom...

Страница 21: ...e table in chapter 6 Press ESC to go back to the Service menu Type of supported TCVR and working frequency are visible on the display AUTO LED is ON Type of supported TCVR and working frequency are vi...

Страница 22: ...tep by step also In the moment when Ip reaches 250mA adjustment stops Press ESC after stopping Use UP or DOWN to select Calibration Ip Is Press ENT to do it Ip and Is calibration runs in the backgroun...

Страница 23: ...OFF Changing of DSP allows user to watch couple of basic parameters of the PA in operation mode without input RF signal Notice These are three default display settings software version 6 1 Check all...

Страница 24: ...ity For this purpose the amplifier has to be tuned carefully CAUTION The operation of a mistuned PA will cause malfunctions the increase of grid current and problems with TVI BCI CAUTION If the input...

Страница 25: ...nna Make your own table valid for your real conditions There are two ways how to do fine tuning The first method uses a gradual increase in the input power when tuning the PA as most operators accusto...

Страница 26: ...of tuning Now increase input power slowly and watch the display Two of important information is visible screen current increased but still is within the allowed limits Turn LOAD knob slightly in arro...

Страница 27: ...so If the heating voltage without RF signal is OK but under full load drops more than 1 5 V this relates to the soft AC network and is solvable only by changing the AC network Without RF power the pla...

Страница 28: ...cription interrupt the tuning procedure immediately and check the amplifier Be sure not to do any mistakes in choosing bands or TUNE LOAD values Be sure that VSWR is not higher than 2 1 and input powe...

Страница 29: ...the fault will repeat 3 times during 10 seconds the safety circuits will turn the amplifier to STBY mode FAULT LED stays ON To cancel fault status press RESET shortly Power amplifier will stay in STBY...

Страница 30: ...ut RF signal should be between 8 5 and 9V 3 HARD FAULT appears if the plate current exceeds 2 5 A In such a situation hardware will immediately disconnect high voltage from the plate Fault is signed w...

Страница 31: ...not a hardware failure it usually succeeds For example high VSWR high Input power mistune of PA high temperature etc In the case of some hardware failure or if your power amplifier is not working prop...

Страница 32: ...ase of vacuum tube damaging contact the manufacturer or your dealer for ordering new one You will get instructuions how to change it Exchange can be carried out only by professionally qualified person...

Страница 33: ...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 Switch ON board connector J6 is located Use...

Страница 34: ...ts weight it will move down just 1 cm and remains on the central rung of the PA 5 Use both hands to take transformer away from the chassis Watch the released terminals when moving the transformer Do n...

Страница 35: ...34...

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