Emtron DX-3 Operating Manual Download Page 22

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14 GLOSSARY

Alternating

Current

ALC

Automatic Level Control

Amplitude

Modulation

BALUN

Balanced to Unbalanced Transformer

BNC

Bayonet

Neil-Concelman

Connector

decibel

Continuous

Wave

Direct

Current

EBS

Electronic

Bias

Switch

Frequency

Modulation

High Frequency

High

Voltage

IEC

International

Electro-technical

Comission

IMD

Inter-Modulation

Distortion

LED

Light

Emitting

Diode

PEP

Peak

Envelope

Power

Radio

Frequency

RTT

Radio Tele Type

SSB

Single

Side

Band

SSTV

Slow Scan Tele Vision

SWR

Standing

Wave

Ratio

VAC

Volts,

Alternating

Current

VDC

Volts, Direct Current

WARC

World Administrative Radio-communications Conference

VSWR

Voltage Standing Wave Ratio

Summary of Contents for DX-3

Page 1: ...PERATING MANUAL EMTRON DX 3 HF LINEAR AMPLIFIER April 2005 Emtron DIVISION OF EMONA ELECTRONICS PTY LTD 92 94 Wentworth Avenue Sydney 2010 Australia Tel 612 92110988 Fax 612 92811508 www emtron com au...

Page 2: ...TEST FREQUENCY BAND FACTORY SETTINGS 50 OHM LOAD USER SETTINGS ANTENNA PLATE LOAD PLATE LOAD 28 600 MHz 10m 24 900 MHz 12m 21 200 MHz 15m 18 100 MHz 17m 14 200 MHz 20m 10 125 MHz 30m 7 070 MHz 40m 3...

Page 3: ...ORT VERSION 12 7 4 OPERATION AT 230V 220V 200V EXPORT VERSION 12 8 DX 3 DESCRIPTION 13 8 1 RF SECTION 13 8 2 MAINS TRANSFORMER 14 8 3 H V POWER SUPPLY 14 8 4 SOFT START MODULE 14 8 5 SENSOR MODULE 14...

Page 4: ...PONENT LEGEND SILKSCREEN TOP 33 CONTROL BOARD SOLDER SIDE TRACK WORK 34 16 APPENDIX 2 WAVEFORMS 35 16 1 QSK OPTIONAL MODULE SWITCHING 35 16 2 LINEARITY 35 17 APPENDIX 3 ADJUSTMENTS 36 17 1 CONTROL BOA...

Page 5: ...peration of the DX 3 is greatly simplified by the absence of meter switching mechanical display and front panel level setting controls The front panel moving LED display systems indicate simultaneousl...

Page 6: ...emperature Sensor TANK COIL 40 160 m RF CHOKE TANK COIL 10 30 m RF SENSOR QSK SOFT START HIGH VOLTAGE POWER SUPPLY CONTROL BOARD SAFETY MICORSWITCH BLOWER BAND SWITCH BAND SELECTOR PLATE TUNING LOAD T...

Page 7: ...or plate current should the plate current exceed a safe value the amplifier goes to standby mode for 2 minutes screen grid over current Absolute tube protection is offered with visual warning and a re...

Page 8: ...high 465mm deep WEIGHT 18 kg 40 lb unpacked Transformer 25 kg 56 lb unpacked 3 UNPACKING The DX 3 is packed in a heavy duty package easily sufficient to protect the amplifier during transportation eve...

Page 9: ...lips screwdriver Connect the 2 mains wires to the terminal block of the soft start module See picture Page 6 Put the cover back and the installation is complete 4 INSTALLATION ENVIRONMENT 4 1 Required...

Page 10: ...k must be connected to transceiver or exciter relay contacts which are open on RECEIVE and closed on TRANSMIT The voltage at the PTT input is typically 28V loaded up to 35V unloaded with an impedance...

Page 11: ...single LED yellow Turns on at the end of warm up period when the mains power to DX 3 is switched on It turns off for about 2 minutes if the plate current protection is triggered In this case the FAULT...

Page 12: ...xport version As different countries have different standards for their power connections the DX 3 amplifiers exported from Australia are supplied with an un terminated power cable The green yellow wi...

Page 13: ...itioned on a separate RF sub chassis All the connections to the tube except for the plate are under this sub chassis A 9 way heavy duty connector is used for the outside connections The fan blows air...

Page 14: ...the forward and reverse power for measurement and display 8 6 Antenna relay QSK module Fitted as standard in DX 3 the antenna relay is a QSK module controlled by the transceiver via the control board...

Page 15: ...adjusted to about 2 6 1 EBS the Electronic Bias Switch senses the presence of RF input power and turns on the bias to start transmission Factory adjusted for about 0 5W When the input power exceeds t...

Page 16: ...PLATE knobs in the initial positions given in Table 1 DX 3 must be powered ON and Ready with the OPR STBY switch in OPR position Start with the transmitter at minimum power in a carrier mode e g RTTY...

Page 17: ...nd LOAD can be used for final tuning with no need to repeat the preliminary tuning every time Tuning for full power Start with low drive level and the PLATE and LOAD knobs in the known initial positio...

Page 18: ...ciple the SWR protection level in DX 3 is adjustable but it is far preferable for you to fix your antenna 10 2 ALC ADJUSTMENT The DX 3 can be operated without any ALC connection However if you wish to...

Page 19: ...te current drastically minimising the tube dissipation Be aware that at a low power level slightly different tuning is required than is for full power Achieving the best linearity The amplifier must b...

Page 20: ...e blows again or if the fuses were not blown in the first place contact your supplier 12 2 Fan not working As soon as you switch the power on you should notice two things about your DX 3 the display s...

Page 21: ...he flashing will stop Then switch the power off and contact your supplier 12 7 Sparks Discharges in RF area Very high RF voltages are present in the amplifier during the operation at high power Incurs...

Page 22: ...FM Frequency Modulation HF High Frequency HV High Voltage IEC International Electro technical Comission IMD Inter Modulation Distortion LED Light Emitting Diode PEP Peak Envelope Power RF Radio Freque...

Page 23: ...L BOARD MODULE See Schematic RF SENSOR 5V FAULT ON AIR O DRIVE Vp Ip Ip Protec READY SW Ig2 Pf Pr SWR Protect RF OUT ANTENNA ANTENNA RELAY QSK See schematic Relay 1 2 RF IN TRANSCEIVER TEMPERATURE SEN...

Page 24: ...F 6A100 6A100 1000pF 6A100 470uF 450V 75k 25R IP 1000pF 6A100 1000pF 6A100 1000pF 1000pF 6A100 330k 330k 330k 6A100 1000pF 6A100 75k 470uF 450V 6A100 6A100 6A100 75k 6A100 470uF 450V 6A100 470uF 450V...

Page 25: ...GRY PNK BLK W BLK X O DRV BIAS READY RFIN HLSW HLSW VIOLET WHITE RED GRN BROWN GRN BRN GRN BRN ALC SWR2 SWR1 SWR4 SWR3 ALC2 PNK BLK Y BLK Y BLK Y RED Y RED GREEN T110 1 T110 2 GND GND 300VAC2 300VAC1...

Page 26: ...rtWiring 1 SOFT START WIRING Standard version 1 1 Monday January 07 2002 Title Size Document Number Rev Date Sheet of 25A Yellow Green NEUTRAL 1 Brown Blue 4 7nF 250V Y2 Cover Interlock MT1 Brown Blue...

Page 27: ...RLOCK Brown MT2 Blue MT1 200V Yellow Yellow Green 4 7nF 250Vac Y2 NEUTRAL 1 To LOOM 12V Blue Sof tStartWiring US 1 SOFT START WIRING U S Version A4 1 1 Monday January 07 2002 Title Size Document Numbe...

Page 28: ...uF 25V SWITCH MT2 R8 470k 2W C3 2 2nF NOTE 200V to 240V operation R10 100k D2 1N4007 C4 220uF 25V For 110VAC replace C1 by 3 9k or 4 3k 6W resistor R7 470k 2W R9 10k E M T R O N C1 470nF 250Vac X2 C11...

Page 29: ...ECK OUT E M T R O N RL1 Jenings TJ1A 26S D5 1N4004 RL2 Jenings TJ1A 26S R3 100 1W QSKV3DX3 3 QSKv3 DX 3 A4 1 1 Monday January 07 2002 Title Size Document Number Rev Date Sheet of RF DECK IN D3 1N4004...

Page 30: ...3 10 NOTE L Pad version shown No L Pad R5 0 R7 50 CV1 500pF C10 22nF V1 GU78B Brown C8 1500p SM COAX R6 10 2W COAX D4 A106 EG2 MOV3 140V C6 22nF 700uH R5 12 5 50W D1 A106 C14 2200pF MOV1 140V White C9...

Page 31: ...E RLO RHI REF A DJ V V REF O UT LE D1 LE D2 LE D3 LE D4 LE D5 LE D6 LE D7 LE D8 LE D9 LE D10 L74 G L10 Y X3 16 O D 1 U10 LM3914 5 9 4 6 8 3 2 7 10 11 12 13 14 15 16 17 18 1 SI G I N M OD E RLO RHI RE...

Page 32: ...9 100R R20 5M6 C6 100nF D4 12V U11 PC521 POT3 50K 4 7nF C45 R23 100R C8 10uF 16V 22k R24 22k R25 R66 100K X6 LP2 C15 100uF 50V C16 100nF BR4 WO6 X2 1nF 1KV C18 R50 5K 1K 100R 1 2 3 SW1 X2 U9 PC521 D22...

Page 33: ...2 R19 R20 R23 R24 R25 Q8 D28 D27 1 C23 U10 U9 U8 U6 BR3 1 C54 X3 R69 Q1 C15 R36 U4 D7 C9 R41 D25 C12 POT7 C20 1 C16 U1 C7 X2 X5 D1 RL1 Q7 D4 C36 R32 Q5 Q14 POT3 R50 Q9 D9 U11 Q25 R13 R12 D26 POT1 C1 1...

Page 34: ...34 Control Board Solder Side Track work COPPER LAYER SOLDER SIDE AMPC V 3E...

Page 35: ...tching The output relay Top trace switches first then the RF drive is applied Bottom trace 16 2Linearity V V a 1674mV b 1958mV 21Apr2003 18 36 Fig 5 Sample of linearity curve obtained on a DX 3 at 400...

Page 36: ...l plate current as soon as PTT is on The transition to full on is then less abrupt while the tube dissipation is still reduced by using EBS PTT Off Ip 0 PTT On no drive and EBS on Ip Ipb pre bias curr...

Page 37: ...n 130 ohm and 140 ohm With a 50 ohm output these 2 loads give an SWR of 2 6 1 and 2 8 1 respectively The adjustment is nominally for a ratio of 2 7 1 to trigger the protection in the form of antenna b...

Page 38: ...nce gradually At 10 kohm the reading will be about 35 mA Continue reducing the resistance until the current reaches about 60 70 mA The screen voltage must drop to about 300 V or less under this load I...

Page 39: ...39 Figure 6 BIAS SWR SCREEN VOLTAGE SCREEN CURRENT LIMIT Ip PROTECTION EBS SENSITIVITY EBS OFF EBS ON...

Page 40: ...row on the display board Adjust potentiometer AMP for correct indication 17 2 2 PLATE VOLTATE Adjustment VR2 marked VOLT Using a voltmeter with a high voltage probe measure the plate voltage Adjust p...

Page 41: ...2 5 SCREEN CURRENT Adjustment VR6 marked IG2 VR5 marked IG2 ig2 put VR5 in the middle position ig2 connect a mA meter in series with the screen supply between the control board pin EG2 and the blue sc...

Page 42: ...res 100mV or less Adjust the trimmer on the output side left hand side in the RF sensor for minimum reading on the yellow red wires Use an RF screwdriver Reverse the 2 RF cables apply power to the out...

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