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43

Figure

22

Control Board – Component side view

17.2 Display Board Adjustments

The display board is pre-adjusted during testing. However, when a new display board is installed in the amplifier, most adjustments
need to be fine-tuned. Remove the front panel glass to gain access to adjustments. The ig2+ adjustment is recommended also when the
control board is replaced.

17.2.1 PLATE CURRENT

Adjustment: VR4, Marked: AMP

Connect a power supply to pin TP2 on the control board: negative to TP2, positive to the chassis.
Apply a current with a value of 1 A.

BIAS

SWR

SCREEN
VOLTAGE

SCREEN
CURRENT
LIMIT

Ip PROTECTION

EBS
SENSITIVITY

EBS ON

EBS OFF

PRE-BIAS

TP2

R20

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Summary of Contents for DX-3SP

Page 1: ...OPERATING MANUAL EMTRON DX 3SP HF LINEAR AMPLIFIER February 2009 Emtron DIVISION OF EMONA ELECTRONICS PTY LTD 92 94 Wentworth Avenue Sydney 2010 Australia Tel 612 92110988 www emtron com au...

Page 2: ...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 3 600 MHz 80m 1 800 MH...

Page 3: ...R 13 7 2 EARTH AND MAINS CONNECTIONS 13 7 3 TERMINATING THE POWER CABLE EXPORT VERSION 13 7 4 OPERATION AT 240V 230V 220V 200V EXPORT VERSION 13 8 DX 3SP DESCRIPTION 15 8 1 RF SECTION 15 8 2 MAINS TRA...

Page 4: ...2 3 RF Module Simplified 29 15 2 4 RF output circuit 30 15 2 5 QSK Circuit Diagram 31 15 2 6 RF Sensor 32 15 2 7 DISPLAY BOARD Circuit Diagram 33 15 2 8 CONTROL BOARD Circuit Diagram 34 15 3 CONTROL B...

Page 5: ...ence of meter switching and of front panel level setting controls The front panel moving LED display systems indicate simultaneously the output forward and reverse power screen grid current positive a...

Page 6: ...WER ON OFF STANDBY OPERATE SWITCH DISPLAY TANK COIL 40 160 m TANK COIL 10 30 m BAND SWITCH Temperature Sensors RF CHOKE RF SENSOR ANT RELAY QSK BLOWER SOFT START SAFETY MICORSWITCH HIGH VOLTAGE POWER...

Page 7: ...The comprehensive fault protection system includes circuitry to monitor plate current should the plate current exceed a safe value the amplifier goes to standby for 2 minutes The nominal trip plate c...

Page 8: ...ching at very fast rate typically 3ms switching time in each direction SOFT START when switched on the mains power is gradually applied to the transformer over a period of about 5 seconds to avoid the...

Page 9: ...3 Installing the transformer Make sure the transformer is wired for the nominal mains voltage in your area See 7 4 Two people are needed to install the transformer The best is to put the DX 3SP on a f...

Page 10: ...the cover back and the installation is complete 4 INSTALLATION ENVIRONMENT 4 1 Required environment The DX 3SP amplifier can be operated at an ambient temperature between 0 and 40 Celsius It should be...

Page 11: ...pplied to the input is bypassed to the output If this switch is changed to OPERATE before the READY light comes on the FAULT light will turn on This is not a fault but it is better to leave the switch...

Page 12: ...ill cut off the operation for about 2 seconds NOTE the input drive for the indicator to turn on depends on a certain extent on the tuning of the amplifier 6 REAR PANEL The following connectors and con...

Page 13: ...for their power connections the DX 3SP amplifiers exported from Australia are supplied with an un terminated power cable The green yellow wire is connected to the amplifier chassis and MUST be connect...

Page 14: ...C Figure 6 Wiring for 230V shown as example Figure 7 TRANSFORMER AC INPUT CONNECTIONS 240 230 220 0 200V 200 FAN 240 230 220 200 0 220 220V FAN 240 220 200 0 230 230V FAN 240 230 220 200 0 240 0 240V...

Page 15: ...the choke supplying the 3400VDC voltage to the plate of the FU 728F tubes Above the tubes there is one fans sucking air and reducing the back pressure to the blower 8 2 Mains transformer The transform...

Page 16: ...ensitive grid current detector for overdrive detection Adjustable pre bias removes the distortion at the beginning of the word when EBS is activated Screen voltage regulator with adjustable voltage an...

Page 17: ...t turns on This takes about 2 3 minutes WARNING WHEN YOU SWITCH THE POWER ON YOU MUST HEAR AIR FLOW NOISE IF THERE IS NO AIR FLOW NOISE SWITCH THE POWER OFF IMMEDIATELY AND CONTACT YOUR SUPPLIER 10 OP...

Page 18: ...me only about 10 seconds Go gradually in several steps When about 1000W output is reached adjust LOAD for maximum output At low and medium power Ig2 indication will be green the screen current is reve...

Page 19: ...and LOAD until the overdrive indicator is just about to turn ON and at the same time Ig2 shows two or three red LED s ON Fine tune PLATE for maximum output and maximum Ig2 Repeat the step above if re...

Page 20: ...ciated antenna switching components In principle the SWR protection level in DX 3SP is adjustable but it is far preferable for you to fix your antenna system 10 2 USING YOUR DX 3SP While tuning and ad...

Page 21: ...ll cause severe distortion When the Over drive indicator just begins to turn on there is a very small amount of distortion created by a grid current of about 150 microamperes With this indicator flash...

Page 22: ...but the timer is not activated The READY light turns off and the FAULT light turns on When the tube cools down the FAULT turns off and the operation can resume This type of fault should never happen D...

Page 23: ...tion sections there is a protection system acting on DX 3SP input overdrive When the drive reaches the limit where signal distortion begins to occur the overdrive indicator on the front panel will war...

Page 24: ...Frequency Modulation HF High Frequency HV High Voltage IEC International Electro technical Commission IMD Inter Modulation Distortion LED Light Emitting Diode PEP Peak Envelope Power RF Radio Frequen...

Page 25: ...p fuse Line 2 30 amp fuse RF input RF output PTT relay ALC output ALC adjust Soft start Front panel Display panel Transformer High Voltage supply Control board module On Off switch Stby Opr switch RF...

Page 26: ...Yellow Green LINE 2 1 TRANSFORMER MT1 Yellow 220V 0V Blue Brown Brown BTA40 600B Brown 120V A Blue 230V MT2 K1 RELAY Blue S2 ON OFF G 240V 4 7nF 250Vac Y2 Brown or Black Phase S1 COVER INTERLOCK MT1...

Page 27: ...V S C L A S SS R C R G T G N D V C C S R P C D S S TPA S C A P S S C L S R4 150 2W C9 100nF For 110VAC operation add R11 and move jumper to 110V position JP1 1 2 3 SWITCH R2 56R 2W C6 2 2nF PHASE T R...

Page 28: ...28 15 2 2HIGH VOLTAGE POWER SUPPLY Circuit Diagram Figure 10...

Page 29: ...Black COAX 1N4148 140V 10nF R F OUT MODULE 1000pF 6kV 10nF 10nF 1kV Brown SAFETY CHOKE 50 100W COAX Simplified Diagram 10 5W A106 1N4148 White PLATE CHOKE 3x150 220k Lp 1000pF 6kV CV1 500pF 275V 1000...

Page 30: ...cuit 47pF QSK Switching ANTENNA 17 30 17 80 L2 Torroid C1 50pF RF SENSOR SW1 3 15 1500pF 80 PLATE 40 12 17 20 30 80 15 250pF 30 3300pF 10kV 160 C2 1100pF SW1 2 SW1 1 160 40 20 L1 RF COIL 10 160 20 470...

Page 31: ...COAXIAL CABLE thin E M T R O N D3 1N4148 D6 1N4148 RF OUT D5 1N4148 RL1 NR HD 16V RF IN SO239 JP1 1 2 TO RF SENSOR D1 1N4148 C1 22uF COAXIAL CABLE thin 50 Rin RF DECK IN COAXIAL CABLE thick D4 1N4004...

Page 32: ...5 2 6 RF Sensor IN C7 220pF C1 10pF REV C5 10pF DIR C13 47pF D1 D1N4148 C4 10pF D2 D1N4148 C6 40pF R2 2 2k L2 C2 10pF OUT R3 22 2W L1 C3 40pF R4 2 2k C10 10nF C12 47pF C9 10nF R1 22 2W C8 220pF Figure...

Page 33: ...14 15 16 17 18 1 SIG IN MODE RLO RHI REF ADJ V V REF OUT LED1 LED2 LED3 LED4 LED5 LED6 LED7 LED8 LED9 LED10 L74 G L10 Y X 3 16 O D 1 U10 LM3914 5 9 4 6 8 3 2 7 10 11 12 13 14 15 16 17 18 1 SIG IN MODE...

Page 34: ...34 15 2 8CONTROL BOARD Circuit Diagram Figure 16...

Page 35: ...K Y BLK Y RED Y RED GREEN YELLOW YELLOW PINK PINK X X YELLOW YELLOW GREEN X GRY BLU GRY BLU Ip TP2 GRY BLK Y GRN RED RED W VI X BLUE ORN ORN 12VP ORN BLK Y GRN W R GRY W BLK GRN PNK BLK RED X GRY BLU...

Page 36: ...36 15 3 1Control Board Component Layout Figure 18 R20 TP4...

Page 37: ...37 15 3 2Control Board Solder Side Track work Figure 19...

Page 38: ...ot switching The output relay Top trace switches first and then the RF drive is applied Bottom trace 16 2Linearity Linear Trapezoid Modulation Pattern Figure 21 Sample of linearity curve obtained by u...

Page 39: ...is applied The Pre bias establishes a small 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...

Page 40: ...en from the high voltage supply is dissipated by the tube Be brief and quick Put PTT on for a few seconds then off Repeat several times until the desired standing current is achieved NOTE After adjust...

Page 41: ...htly different between bands 17 1 5 SCREEN VOLTAGE ADJUSTMENT Adjustment POT2 marked SCREEN The screen voltage can be measured on the pin marked EG2 on the control board close to the jumper EBS this p...

Page 42: ...must be put on STANDBY If left on OPR the operation will resume automatically at the end of the about 2 minutes warm up time During this time any RF power applied to the input is bypassed into antenna...

Page 43: ...tuned Remove the front panel glass to gain access to adjustments The ig2 adjustment is recommended also when the control board is replaced 17 2 1 PLATE CURRENT Adjustment VR4 Marked AMP Connect a powe...

Page 44: ...F F for correct display indication 17 2 5 SCREEN CURRENT Adjustment VR6 marked IG2 VR5 marked IG2 ig2 connect a mA meter in series with the screen supply between the control board pin EG2 and the blue...

Page 45: ...nimum reading on the yellow red wires Use an RF screwdriver Reverse the 2 RF cables apply power to the output of the amplifier and put the dummy load on the input Apply power again The typical reading...

Page 46: ...46 Emtron DIVISION OF EMONA ELECTRONICS PTY LTD 92 94 Wentworth Avenue Sydney 2010 Australia Tel 612 92110988 www emtron com au...

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