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Copyright © 2004 CBTricks.com

Nomad Radio Heavy-Duty High-Voltage power-supply board kit for the Pride DX-300 base amplifier.

The Kit includes all the parts to build a single PCB HV Power Supply that replaces both HV PCB in a Pride
DX300. This PCB lets you completely remove the original two H.V. circuit boards and install the single-piece
replacement.
The Kit has the following components.
1) HDHV version 3 printed-circuit board
6) 180µF 450-Volt radial "snap-in" electrolytic capacitors.
2) 5-ohm 5-Watt wirewound power resistors
7) 240K ohm 2-Watt carbon-film bleeder resistors
26) 1N5408 3-Amp 1000-Volt rated rectifier diodes.

Nomad Radio

1615 Bardstown Road

Louisville, KY 40205

http://www.nomadradio.com

[email protected]

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Summary of Contents for Amp Series

Page 1: ...PRIDE DX 300 Service Manual Amp Series Copyright 2004 CBTricks com Version 1 0...

Page 2: ...ervicing of high power amplifiers If covers need be removed allow two minutes after turning the unit off and unplugging the line cord before removing covers Disclaimer Although the greatest care has b...

Page 3: ...justment 12 4 4 Voltage Checks 13 4 5 Preventive Maintenance 13 4 6 Tube Replacement 14 CHAPTER 5 PCB Layouts 5 0 Low Voltage Supply PCB 15 5 1 High Voltage Supply PCB Board 1 16 5 2 High Voltage Supp...

Page 4: ...ias Circuit Modification Version 2 32 CHAPTER 8 Component Information 8 0 Introduction 33 8 1 Antenna Change Over and Preamp Relay Information 33 8 2 Band Switch 33 8 3 Input Coil Detail 33 8 4 Z1 Det...

Page 5: ...ction but with care anyone should have not problems with tuning it using the TUNE mode 1 1 SPECIFICATIONS Power Ratings Mode Drive Power SSB 15 watts peak 1000 watts PEP input 650 watts nominal peak o...

Page 6: ...sed with matched antenna systems better than 1 5 to 1 SWR but will have somewhat higher loss The amplifier will match most loads from 25 to 100ohm 4 Exciter power levels above 12 watts PEP or 5 watts...

Page 7: ...ndicated on the front panel wattmeter The SCREEN overload indicator may glow at this time and will peak in brilliance at approximately the same place of tuning that maximum output occurs 7 The PLATE L...

Page 8: ...tting tube has been proven is commercial and military uses where long life and reliability are major factors Although it is designed to work a little harder in amateur service it will still be extreme...

Page 9: ...ately 10db of gain on the higher frequencies Power supplies 3 1 High Voltage Supply PCB The high voltage supply consists of the plate supply transformer located on the top of the chassis and the two r...

Page 10: ...50VDC is fed through two power resistors to provide source current for an 82 volt Zener diode D25 that provides a stable bias supply voltage This 82 volt supply is dropped in a voltage divider consist...

Page 11: ...tching transistor When the amplifier is in the standby mode drive is fed through the relay to the output connector In the operate or tune mode drive is switched to the 9 1 input matching transformer T...

Page 12: ...hat are in series with the cathode line provide some additional bias during the TUNE mode causing a loss in power gain and making it easy to tune up at lower power These resistors are shorted out by a...

Page 13: ...rlock PCB Figure 3 5 Safety Interlock Circuit Never turn on the amp with cover off The shorting safety switch will cause the high voltage to short out If this happens it will usually takes out R59 or...

Page 14: ...of the tube 4 Attempting to operate the unit with top cover removed with the interlock blocked may make the amplifier erratic in tuning and performance due to the high level of R F on the top chassis...

Page 15: ...r supplies Remove the bottom cover 2 Place a jumper wire or clip lead from point A on the main circuit board to ground Refer to pictorial for specific placement of the jumper Figure 4 1 Jumper A 3 Rep...

Page 16: ...8 U from the wattmeter board to the input of the dummy load wattmeter 4 Apply power and adjust the exciter for an output of 100 to 200watts as read on the dummy load wattmeter 5 Set the potentiometer...

Page 17: ...g the B supply 2200 VDC use only a meter which is designed to measure 2kv plus safety during operation at high voltage levels 8 Restore the unit to its original condition 4 5 Preventive Maintenance Th...

Page 18: ...Edcom Not Good Tubes that will work 4CX250B 4CX250R Have heard of people using a 4CX350B but I haven t tested that 4CX250B 7203 4CX250R 7580W Characteristics Plate Dissipation Max 250 Watts Screen Dis...

Page 19: ...32 Copyright 2004 CBTricks com Pride DX300 CHAPTER 5 5 0 Low Voltage Supply PCB...

Page 20: ...32 Copyright 2004 CBTricks com Pride DX300 CHAPTER 5 5 1 High Voltage Supply PCB Board 1...

Page 21: ...32 Copyright 2004 CBTricks com Pride DX300 CHAPTER 5 5 2 High Voltage Supply PCB Board 2...

Page 22: ...32 Copyright 2004 CBTricks com Pride DX300 CHAPTER 5 5 3 Wattmeter PCB...

Page 23: ...32 Copyright 2004 CBTricks com Pride DX300 CHAPTER 5 5 4 RF Input and Control PCB...

Page 24: ...32 Copyright 2004 CBTricks com Pride DX300 CHAPTER 5 5 5 Safety Interlock PCB...

Page 25: ...32 Copyright 2004 CBTricks com Pride DX300 CHAPTER 5 5 6 PCB Trace Layouts...

Page 26: ...32 Copyright 2004 CBTricks com Pride DX300 CHAPTER 5 PCB Trace Layouts Cont...

Page 27: ...32 Copyright 2004 CBTricks com Pride DX300 CHAPTER 5 5 7 Chassis Layouts Front and Rear...

Page 28: ...32 Copyright 2004 CBTricks com Pride DX300 CHAPTER 5 5 8 Chassis Layouts Top and Bottom...

Page 29: ...0 02 R26 Resistor Wire wound 25 Ohm 10W 10 17 2500 10 Capacitors Ref Description MFR Part No C14 Capacitor Ceramic Disk 0 001 F 1KV 08 0102 00 C15 Capacitor Ceramic Disk 0 001 F 1KV 08 0102 00 C16 Cap...

Page 30: ...ramic Disk 0 001 F 1KV 08 0102 00 C8 Capacitor Ceramic Disk 0 001 F 1KV 08 0102 00 C9 Capacitor Ceramic Disk 0 001 F 1KV 08 0102 00 C10 Capacitor Ceramic Disk 0 001 F 1KV 08 0102 00 C11 Capacitor Elec...

Page 31: ...Part No C25 Capacitor Ceramic Disk 0 001 F 1KV 08 0102 00 C26 Capacitor Ceramic Disk 0 001 F 1KV 08 0102 00 C27 Capacitor Ceramic Disk 0 001 F 1KV 08 0102 00 C28 Capacitor Ceramic Disk 0 001 F 1KV 08...

Page 32: ...01 00 R54 Resistor Carbon Film 10K Ohm 1 2W 5 06 1003 00 R55 Resistor Carbon Film 270 Ohm 1 2W 5 06 2701 00 R56 Resistor Carbon Film 470 Ohm 1 2W 5 06 4701 00 R57 Resistor Carbon Film 68K Ohm 1 2W 5 0...

Page 33: ...1 F 1KV 08 0103 02 C45 Capacitor Ceramic Disk 0 01 F 1KV 08 0103 02 C46 Capacitor Ceramic Disk 0 01 F 1KV 08 0103 02 C47 Capacitor Ceramic Disk 0 01 F 1KV 08 0103 02 C48 Capacitor Ceramic Disk 0 01 F...

Page 34: ...R62 Resistor Carbon Film 100 Ohm 2W R63 Resistor Carbon Film 100 Ohm 2W R64 L9 Choke RF Plate 55 H 24 0014 00 T1 Transformer DX 300 High Voltage 25 0300 01 T2 Transformer DX 300 Low Voltage 25 0300 02...

Page 35: ...de of the plate choke can stop oscillation of the tube Typically 001 F at 3000Volts 7 4 Wattmeter PCB Modification Nomad Radio Mod On the small circuit board bolted to the rear of the meter the output...

Page 36: ...ngle 5K 50W resistor off the board to do that job It runs cooler and leaves room for five or six zeners in series on the low voltage power supply PCB With six zeners installed the pot has an end to en...

Page 37: ...le still keyed the band switch is ruined for good the contacts will burn so badly that the entire switch will have to be replaced The Band switch I haven t found a replacement 8 3 Input Coil Informati...

Page 38: ...32 Copyright 2004 CBTricks com...

Page 39: ...he 800 line Fax 888 744 1943 760 744 1943 WESTGATE LABORATORIES L L C 1859 Caravan Trail Suite 106 Jacksonville FL 32216 http www westgateparts com 1 800 213 4563 Local 904 997 2031 Fax 904 997 2041 E...

Page 40: ...mpletely remove the original two H V circuit boards and install the single piece replacement The Kit has the following components 1 HDHV version 3 printed circuit board 6 180 F 450 Volt radial snap in...

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