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MFJ-9420 Installation Manual

20-Meter SSB Travel Radio

PARTS LIST

DESIGNATION

DESCRIPTION

PART #

DESIGNATION

DESCRIPTION

PART #

C1,5,73

100pF, 50V Multilayer

205-0100

VN10KM

305-6005

560pF, 50V Multilayer

205-0005

J310

305-6310

C3,7,11,18,19,20,21,27

.01uF, 25/50V Disc

200-0004

Q10

2N5109

305-0017

C28,29,34,36,38,42,45,52

.01uF, 25/50V Disc

200-0004

Q11

MRF-477

305-5477

C53,55,58,59,63,65,66,70

.01uF, 25/50V Disc

200-0004

R1,2,7,15,16,19,26,43

2.2k

Ω

, ¼ Watt

100-3220

C75,76,79,85,88,90,96

.01uF, 25/50V Disc

200-0004

R3,54

4.7k

Ω

, ¼ Watt

100-3470

C4,71

4.7pF, 500V Disc

200-1004

R4,8,11,14,20,39,41,45

10k

Ω

, ¼ Watt

100-4100

680pF, 50V Multilaeyr

205-0680

R62

10k

Ω

, ¼ Watt

100-4100

C8,9,33,46,50,56,77,78

.1uF, 25/100V Disc

200-0005

R5,23,28,46

Ω

, ¼ Watt

100-3100

C81,86,89,95,97,98,99

.1uF, 25/100V Disc

200-0005

R6,36,61,64

Ω

, Trimpot

133-3100

C10,31,57

220pF, 50 Disc

200-0010

R9,25

330

Ω

, ¼ Watt

100-2330

C12,13,14

560pF, 160V Polystyrene

202-0022

R10,13,29,47,63

100

Ω

, ¼ Watt

100-2100

C15,84

.01uF, 50V Multilayer

205-1210

R12

680k

Ω

, ¼ Watt

100-5680

C16

27pF, 50V Multilayer

205-0027

R17,24,30,44,52,60

100k

Ω

, ¼ Watt

100-5100

C17

5-50pF, 750V Air Var

204-5050

R18,50

1.5k

Ω

, ¼ Watt

100-3150

C22,26

120pF, 50V Multilayer

205-0120

R21,22,32,33,34,35,38

47k

Ω

, ¼ Watt

100-4470

C23,24,25

150pF, 50V Multilayer

205-0150

R27

50k

Ω

, ¼ Watt

130-4500

C30

2.2uF, 16V Electrolytic

203-8022

R37,53,57

Ω

, ¼ Watt

100-1220

C32,41,60,74,80,100

470pF, 50V Multilayer

205-0470

R40

22k

Ω

, ¼ Watt

100-4220

C35

47pF, 50V Multilayer

205-0047

R42

10k

Ω

, Pot

165-4100

C37,62

22pF, 50V Multilayer

205-0022

R48

3.3k

Ω

, ¼ Watt

100-3330

C39,40,47,48,51,54

1uF, 50V Electrolytic

203-0006

R49

5.6k

Ω

, ¼ Watt

100-3560

C43,44

47uF, 35V Electrolytic

203-0007

R51

10k

Ω

, ¼ Watt

133-4100

C49,83,87

100uF, 16V Electrolytic

203-0003

R55

390

Ω

, ¼ Watt

100-2390

C61

12-100pF, 250V Trimmer

204-0010

Ω

, ¼ Watt

100-1100

C64,69

100pF, 50V Disc

200-2013

R58

180

Ω

, ½ Watt

101-2180

C67,68

180pF, 50V Multilayer

203-8022

R59

150

Ω

, ¼ Watt

100-2150

C72

68pF, 50V Multilayer

205-0068

R60

100k

Ω

, ¼ Watt

100-5100

C82

10uF, 35V Electrolytic

203-0012

R65,67

220

Ω

, ¼ Watt

100-2220

C91,92,93,94

220pF, 500V Sm

208-0220

R66

500

Ω

, Trimpot

130-2500

D1,2,3,4,5,6,7,8,9

1N4148

300-0003

RFC1,2,3,4

10uH, Inductor

401-0102

D10,11

1N4001

300-1004

RFC5

22uH, Inductor

401-0046

D12

MV5753 Red LED

320-0001

RFC6

4.7uH, Inductor

401-0099

D13

Green LED

320-0002

RFC7

4T, Inductor

11-9015-3

2 Position Header

612-0402

RFC8

100uH, Inductor

401-0030

4 Position Header

612-0404

SW1,2

Switch

504-0022

5 Pin Din Connector

611-1005

T1,2,3

25K:1K, Inductor

402-3123

2.1mm Coaxial Jack

601-6021

3:1 Transformer

11-9020-1

12V Relay

408-2042

4:1 Transformer

11-9420-1

L1,2,5,6

1.8uH, Red Inductor

402-3402

U1,3,6,7

NE602

311-1602

6.5uH, Inductor

402-3406

MC1350P

311-1045

15uH, Inductor

401-0043

LM358

311-0386

L7,8

12T, Inductor

11-9020-3

TDA7052AN

. .

Q1,3

2N5486

305-6004

LM317T

307-1021

Q2,5,6

2N3904

305-0018

78L05AC

307-0010

Q4,7

2N3906

305-0002

Y1,2,3,4,5,6,7

10MHz Crystals

405-0065

Содержание MFJ-9420

Страница 1: ...nd competes with radios running far more power Compare with your 100 watt rig You will be amazed by the signal reports TRAVEL LIGHT Packs the same punch as 50 Watt radios without the heavy 10 Amp power supply Designed to run on NiCd s or the ultra light MFJ 4110 AC wall adapter supply RUGGED TRANSMITTER Bullet proof Motorola PA transmitter runs cool and tolerates 3 1 VSWR accidentally opened feedl...

Страница 2: ...may vary somewhat with antenna load When operating in noisy environments you may find it necessary to turn down the mic gain control a screwdriver adjustment located on back panel to reduce background noise The MFJ 9420 uses an analog VFO tuning dial that is inherently less accurate than digital readouts on the plus side analog tuning reduces phase noise lowers power consumption and saves you mone...

Страница 3: ...kills U4 output to prevent mic bleed through via U6 U2 during RX LO for U6 is derived from U3 s BFO oscillator Q8 is used to unbalance U6 for carrier or CW generation DSB output from U6 is routed to Y1 Y6 via switch D1 D2 for removal of LSB products and carrier artifacts After undergoing dynamic compression in U2 the processed USB signal is routed to transmitter mixer U7 by switch D3 D4 where it i...

Страница 4: ...ccepts straight key or keyer XMIT PWR POWER MIC TUNE ON ON OFF OFF 150 000 050 100 150 200 250 300 350 VOLUME MFJ 20 METER SSB TRANSCEIVER MODEL MFJ 9420 TUNING SSB CW CW SSB MHz 14 000 1 3 5 7 9 PROCESS 0 S 7 10 30dB 10 400 4020 6 8 7 2 3 5 1 4 FRONT PANEL 1 METER Show signal strength on RX ALC on TX 2 POWER SWITCH Turns power on to transceiver 3 MIC 5 Pin Din Jack for Dynamic Microphone 4 TUNE I...

Страница 5: ...ennas with a VSWR of 3 1 or less Use your regular station antenna or a portable 20 Meter dipole such as the MFJ 1772 ultra light For non resonant wires use a tuner such as the MFJ 971 Always rough tune for maximum receiver sensitivity first using incoming signals and your S Meter to find a peak AVOID OPERATING INTO UNMATCHED HIGH VSWR ANTENNAS THE MFJ 9420 DOES NOT HAVE A HIGH VSWR SHUT DOWN CIRCU...

Страница 6: ...bration of the MFJ 9420 analog VFO dial SIMPLE 20 METER ANTENNA SUGGESTIONS COAXIAL FED DIPOLES A wire dipole for the phone band should measure about 32 10 16 5 per leg Feed with RG 58U or RG 8X raise high and in the clear for best performance If you have only one high support make an inverted V The full sloper sloping dipole is also an excellent single support antenna with some directivity 90 Bes...

Страница 7: ...te to call a weak station because it may be QRP or using a marginal antenna You may be much louder than you think Be realistic about diving into huge 20 Meter pileups Once a choice DX station hits the packet clusters and the big guns move in calling may be a waste of time until the smoke clears Tune slowly and listen carefully If one exotic station is coming through there may be others you can wor...

Страница 8: ...c a 600 ohm dynamic type Is the MIC GAIN set too low 9 NOISE ON TRANSMIT AUDIO Is MIC GAIN set too high in a noisy room Is mic next to a power transformer or motor If these checks don t uncover the problem or if you do not feel qualified to make the prescribed adjustments please call us for help at 800 647 TECH 800 647 8324 FIELD ALIGNMENT PROCEDURES FOR THE MFJ 9420 TRANSCEIVER SPECIAL TOOLS PART...

Страница 9: ...m S Meter reading C Touch up L1 L2 T1 and T2 for max SIG Meter reading TRANSMITTER BANDPASS FILTER AND COMPRESSOR ALIGNMENT A Connect QRP Wattmeter with dummy load to ANT Jack B Turn R61 fully CW and then the Press Carrier Switch SW2 C Carefully touch up L5 and L6 for peak output D Turn R61 CCW until RF output power drops by 10 If radio fails to operate properly after following these procedures ca...

Страница 10: ... 4 3 0 0 0 5 0 0 0 0 4 3 9 3 3 4 0 0 2 9 4 9 4 7 5 3 9 4 9 4 0 5 0 4 9 4 9 4 7 6 4 9 3 3 5 0 5 0 0 5 7 5 8 7 4 5 0 4 6 5 0 0 4 9 5 2 8 5 0 10 0 5 1 9 9 4 9 4 9 5 8 BIPOLAR AND JFET DEVICES D E Drain Emitter S B Source Base G C Gate Collector Test in TRANSMIT mode Test with TUNE switch depressed DO NOT TEST gate of Q9 may cause generation of parasitic oscillations Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 D E...

Страница 11: ...MFJ 9420 Installation Manual 20 Meter SSB Travel Radio SCHEMATIC ...

Страница 12: ... 80 100 470pF 50V Multilayer 205 0470 R40 22kΩ Watt 100 4220 C35 47pF 50V Multilayer 205 0047 R42 10kΩ Pot 165 4100 C37 62 22pF 50V Multilayer 205 0022 R48 3 3kΩ Watt 100 3330 C39 40 47 48 51 54 1uF 50V Electrolytic 203 0006 R49 5 6kΩ Watt 100 3560 C43 44 47uF 35V Electrolytic 203 0007 R51 10kΩ Watt 133 4100 C49 83 87 100uF 16V Electrolytic 203 0003 R55 390Ω Watt 100 2390 C61 12 100pF 250V Trimmer...

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