QRO Technologies HF-2000 Instruction Manual - Warranty

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WARRANTY

_____________________________________

The HF-2000 is warranted against defects in material and workmanship for a period

of two years for the original date of sale. This warranty does not cover the 3-500

triode which carries a separate warranty issued buy its manufacturer. Please check

the warranty card which comes with the tube.During the warranty period, QRO

Technologies, Inc. will repair or replace the amplifier at our option if it is defective in

any way in material and workmanship. The warranty does not cover any defects

resulting from improper use by the buyer or inadequate maintenance. In such cases

the repair will be billed at prevailing service rates.

For warranty service or repair, the amplifier must be returned to the factory for

authorized service. The buyer shall prepay shipping and insurance charges, QRO

Technologies, Inc. will pay shipping and insurance charges 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 cost. QRO Technologies, Inc. is not liable for any damage incurred

during return shipments.

PROPRIETARY NOTICE

_____________________________________

This instruction manual, schematic diagrams, and technical data herein disclosed,

are proprietary to QRO Technologies, Inc. and shall not, without express written

permission of QRO Technologies, Inc.. be used, in whole or part to solicit quotations

from a competitive source or used for manufacturing by anyone other than QRO

Technologies, Inc. The information herein has been developed at private expense,

and may only be used for operation and maintenance reference purposes or for

purposes of engineering evaluation and incorporation into technical specifications

and other documents which specify procurement of products from QRO

Technologies, Inc. This amplifier is covered by copyrights both in the United States

of America and throughout the world.

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Summary of HF-2000

Page 1
Qro hf-2000 linear amplifier qro hf-2000 linear amplifier instruction manual qro technologies, inc. Qro technologies, inc. 1117 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 1...
Page 2
2 specifications band coverage: 160, 80, 40, 20, 17, and 15 (12 & 10 export only) meter amateur bands. 12 & 10 meter also useable in usa with proof of license and user modification. Drive power required: 120 watts typical maximum output power: 1,500 watts ssb, 1250 watts cw, 800 watts rtty, fm, sstv...
Page 3: Table Of Contents
3 table of contents warranty 4 proprietary notice 4 safety notification 5 unpacking & inspection 6 transformer & tube installation 6, 7 line voltage selection power block wiring 7 reshipment instructions 7, 8 introduction 8 location 7 ac power line considerations 8,9 antenna 9 grounding 9 equipment ...
Page 4: Warranty
4 warranty _____________________________________ the hf-2000 is warranted against defects in material and workmanship for a period of two years for the original date of sale. This warranty does not cover the 3-500 triode which carries a separate warranty issued buy its manufacturer. Please check the...
Page 5: Always Think
5 always think safety __________________________________________________ this linear amplifier described in this manual contains voltage hazardous to human life and safety which is capable of inflicting personal injury. Never operate the amplifier with the top cover removed and the top cover safety ...
Page 6
6 unpacking and inspection the amplifier is shipped in three cartons: amplifier, transformer, tube. Before unpacking each carton, check the exterior of the shipping carton for any sign of damage. All irregularities should be noted. Unpack and remove each component carefully from its carton, preservi...
Page 7
7 which match the five pins on the 3-500 triode. Insert the tube into the socket making sure that the pins align with the socket contacts. If the tube pins and socket contacts are not aligned, the amplifier will not function properly and damage to the tube may result. After you have properly inserte...
Page 8
8 during return shipment. Introduction the qro model hf-2000 linear amplifier is a completely self-contained, grounded grid, linear amplifier. It is designed to operate at 1,500 watts pep output on ssb, 1250 watts on cw, and 1000 watts on such high duty cycle emissions as rtty, sstv, and fm. The hf-...
Page 9
9 neutral white blue ground (earth) green green/yellow use the following nema plug configurations according to the corresponding ac line voltage: 100/110 vac 20 ampere 5-15p 200/240 vac 10 ampere 6-15p or 6-20p due to the power involved, this amplifier should have its own 240 vac electric service li...
Page 10
10 as described above. Equipment interconnections interconnection between the amplifier and a typical transceiver is shown in the "interconnection diagram" located inside your tranceiver owners manual. Many brands of equipment usually follow the same general pattern. Please refer to this diagram plu...
Page 11
11 approximately 100 watts of rf output. You can use a transceiver that has lower output power, but the amplifier's output will be less. If you use a transceiver that delivers more than 100 watts, carefully adjust the driving power to avoid "overdrive" and the creation of spurious signals, which cre...
Page 12
12 please refer to the front panel pictorial while reading the following.The current and voltage figures given in this section are approximate. Actual indications will vary at each installation with such factors as line voltage, transceiver drive, and load impedance. The following procedure for tuni...
Page 13
13 approximately 2900 - 3200 volts. 4. Make sure your transceiver has been turned on and its drive level control has been set to minimum. 5. Turn the band switch to the same band as you have selected on the transceiver. Then preset the tune control and the load control to the positions indicated in ...
Page 14
14 1. Tune up the amplifier as described for cw operation. 2. Advance the transceiver drive and audio levels so that the modulation crest does not exceed 400 ma of plate current, 100 ma of grid current, or 1,500 watts of pep output. Using the front panel alc control to adjust amplifier output power....
Page 15
15 periodic maintenance make sure the amplifier has been disconnected for the ac power source and the high voltage filter capacitors have bleed down to zero. Remove the top cover from the amplifier at least once a year and remove the dust. Dust accumulation can help cause the variable capacitors to ...
Page 16
16 multimeter inoperative in power output function 1. Components on alc/power pcb-610 a. Capacitors c601 -c603, c604, c608, c609 b. Diodes d601, d602 c. Resistors r601, r605, r606 d. Pot r605 e. Transistor q601 2. Switch sw401a&b meter switch pcb-510 3. M-2 multimeter 4. +12v regulated power supply ...
Page 17
17 no plate idling current cut-off when amplifier is not keyed or is in standby mode 1. Components on lv & bias pcb-260 a. Transistor q302 b. Diodes d303 - d310, d311 c. Resistor r301 &r304 d. Transient voltage suppressor tsd301 e. Capacitor c302 f. Resistors r307 - r310 g. Relay k301a h. Zener diod...
Page 18: Circuit Descriptions
18 no rf output 1. Improper connections between transceiver, amplifier, and antenna 2. Transceiver and amplifier are set to different bands 3. Improper tuned input adjustment 4. Defective rf i/o switching pcb-350 5. Defective rf output t/r relay ry1 6. Defective band switch sw3a, sw3b 7. Defective t...
Page 19
19 provides a step-start when the amplifier is switched on. Components c12, r10, d10 provide the time delay to minimize the inrush current. Resistors r11 & r12 limit the inrush current while the delay circuit cycles. After a 1 to 2 second delay the contacts on relay k-1 close allowing the full curre...
Page 20
20 the 12 vac secondary winding of t1 supplies the voltage for the +12 vdc supply circuit located on the lv & bias pcb-260. 110 vac isolation supply the 110 vac secondary winding of t1 provides an isolated supply voltage for the +110 vdc power supply located on the lv & bias pcb-260. Rf input circui...
Page 21
21 alc circuit alc adjust control (r13) located on the front panel allows you to set the alc threshold to match your transceiver.Please refer to the schematic and pcb drawing for the alc/power pcb-610. Capacitors c606 & c607 form a voltage divider that couples some of the rf driving voltage to diode...
Page 22
22 alc multimeter circuit when you select this function, a portion of the negative alc voltage developed in the alc/power pcb-610, described earlier, passes through resistors r603 and r312 (lv & bias pcb-260) to multiplier meter m-2. Rf i/o switching pcb and bias relay switching circuits all rf t/r ...