QRO Technologies HF-2000, Instruction Manual

Page 1: ...7 West High Street P O Box 939 Bryan OH 43506 USA Tel Fax 419 636 2721 E Mail sales qrotec com Internet http www qrotec com PUBLICATION DATE JUNE 1995 COPYRIGHT 1995 BY QRO TECHNOLOGIES INC ALL RIGHTS...

Page 2: ...50 ohms unbalanced with SWR 2 1 or less Tube Requirement 2 3 500Z 3 500ZG 3 500C Power Line Requirement 120 VAC 50 60 Hz at 20 amperes maximum 240 VAC 50 60 Hz at 10 amperes maximum Front Panel Multi...

Page 3: ...ower Line Considerations 8 9 Antenna 9 Grounding 9 Equipment Interconnections 10 Safety Interlock Switch 10 Driving Power 10 Tube 11 Reading the Meters 11 Tune Up Procedure 11 12 Using the ALC Adjust...

Page 4: ...to return the amplifier to the buyer Please call the factory at 1 800 956 2721 for shipping instructions Make sure when returning the amplifier you have insured the instrument for the full replacement...

Page 5: ...neutral earth pole of the power supply Before operating this unit ensure that the protection conductor green wire is connected to the ground earth protective conductor of the power outlet Do not defe...

Page 6: ...the amplifier so the front panel is facing you Position the transformer so the primary leads are on your left and the secondary leads are on your right The amplifier s transformer compartment should b...

Page 7: ...is connected to terminals 2 4 If there is a white wire connected to left side of terminal 6 remove it an connect it to left side of terminal 5 Also if there is a black wire connected to the left side...

Page 8: ...g fan Do not place any books magazines manuals or equipment that will impede the free flow of air near the sides andthe hot air exhaust holes located on the top of the cabinet The internal fan allows...

Page 9: ...urrent AC or DC on the same premises shall be of such circuits are not interchangeable When you install a new plug make sure it is connected according to your local electrical code Keep in mind that t...

Page 10: ...will have to use some other means For instance you could use a shorted RCA phono plug by placing it in the Key XMT socket Then you would have to manually turn off and on the Operate Standby switch lo...

Page 11: ...es without drive applied so the fan will cool the tubes before you turn the Amplifier off READING THE METERS Refer to Front Panel Pictorial while you read the following information Multimeter The Mult...

Page 12: ...ne Voltage Freq Mhz Band Drive Tune Control Load Control Plate Voltage Plate Current Grid Current Power Output 1 80 160 1 90 160 3 55 80 3 90 80 7 20 40 14 20 20 18 10 17 21 30 15 24 90 12 28 50 10 28...

Page 13: ...iately reduce the drive 9 Again key your transceiver and observe the peak RF watts on your wattmeter Adjust the Tune Control and Load Control for maximum output on your wattmeter This is accomplished...

Page 14: ...ur initial operation you may want to check the tuned input circuits for each band to see if it has the proper match A nominal match will show no more than 10 watts reflected with 100 watts of drive ap...

Page 15: ...ms PCB and the Schematic Diagrams to locate and identify the parts listed in this chart If a particular part is mentioned as a possible cause check that part and other components connected to it to se...

Page 16: ...h SW401A B Meter Switch PCB 510 5 M 2 Multimeter Plate idle current over 160 ma or does not read zero in standby mode 1 Components on LV Bias PCB 260 a Transistor Q302 b Diodes D303 D310 c Resistor R3...

Page 17: ...PL1 PL4 Meter Switch PCB 510 No Grid Current Meter Indication with Plate Current Indication OK 1 Components on LV Bias PCB 260 a Resistor R311 b Capacitor C306 2 Grid Meter M 1 Amplifier will not key...

Page 18: ...ed on LV Bias PCB 260 and related wiring 2 LED D1 defective Green Transmit LED not 1 12 VDC supply located on LV Bias PCB 260 and related wiring 2 LED D2 defective 3 Relay K301 and related keying circ...

Page 19: ...positive diodes D101 D105 conduct and capacitors C201 C204 are charged During the other half of the AC line cycle the red lead connected to the junction of D105 D106 becomes positive Capacitors C205 C...

Page 20: ...e plate lead to suppress any VHF parasitic oscillations The positive side of the power supply B is connected to the tube s plate through RFC3 Plate Choke Capacitor C56 provides a low impedance path to...

Page 21: ...R302 R304 form a series multiplier resistance for meter M 2 while resistor R301 forms a current shunt for the meter Diodes D311 D312 plus capacitor C307 provide M 1 with transient protection IP PLATE...

Page 22: ...01 and resistors R601 R602 plus diode D602 form a break make delay circuit for RY1 RY2 This helps to make the proper latching and unlatching sequence for relays K301 RY1 and RY2 Transistor Q601 plus a...