Related Manuals for OM POWER OM3006
Summary of Contents for OM POWER OM3006
- Page 1 Instruction Manual OM3006 50 MHz POWER AMPLIFIER OM POWER, s. r. o. 930 30 Báč 126 SLOVAKIA...
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Page 2: Important Safety Instructions
The amplifier contains high voltage circuits. Never turn the amplifier on without the upper lid in place. The OM3006 amplifier is not to be used in a wet or humid environment nor to be exposed to rainfall. The amplifier must be installed in such a way that free flow of hot air from the tube is allowed. - Page 3 General description of the OM3006 50 MHz Amplifier The linear amplifier OM3006 is designed for 50 MHz amateur bands from 50 till 52 MHz and all modes . It is equipped with a ceramic tetrode GU78b. Specification of OM3006 : amateur bands 50 –...
- Page 4 General Description of OM3006 POWER AMPLIFIER HF PART In this amplifier a tetrode GU 78b is used in a grounded-cathode circuit (input into control grid). This amplifier achieves excellent linearity by the voltage stabilization of the control grid bias and the screen voltage.
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Page 5: Power Supply
POWER SUPPLY Power supply of the amplifier is effected by two 2,5 kVA toroidal transformers. A soft start is realized with the help of relays and resistors. The high anode voltage consists of 8 times 425 V and 2A. Each of them has its own rectifier and filter. In the high voltage circuit safety resistors are employed to protect the amplifier against overload. -
Page 6: Main Supply
During transmitting the middle pin is connected to the ground. The relays of the OM3006 have to be switched earlier than HF is applied (cold switching). Modern transceivers have a time delay between PTT switching and power output. -
Page 7: Reflected Power
HV/IP/TUNE bargraph – measure the anode voltage, anode currency or tuning of the amplifier TUNING The OM3006 amplifier is operated in class AB. Thus it’s possible to obtain a maximum output power at an excellent linearity. For this purpose the amplifier has to be tuned carefully. - Page 8 In SSB you will have a good output power if the green LED lights up a bit. The current of screen grid is measured and shown in a Bar graph indicator. The amplifier has to be tuned in such a way that the current is between - 20 mA to +50 mA.
- Page 9 Please note! If the input power is higher than 15 W and the power amplifier is not correctly tuned, the safety devices will switch to STBY. After switching the amplifier to PTT, the amplifier will automatically reset and switch back to OPR mode after approximately 2 seconds.
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Page 10: Indication Of Fault Conditions
Should a fault condition appear during the tuning or operation of the amplifier the safety circuits of OM3006 will react. The amplifier will be turned to STBY mode. After approx. 1 sec the control ciruits will switch the amplifier back to OPR. If the fault will repeat 3 times after each other the control circuits will turn the amplifier to STBY.