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MFJ-259 Instruction Manual 

HF/VHF SWR Analyzer 

16 

TECHNICAL ASSISTANCE 

 
If you have any problem with this unit first check the appropriate section of this manual. If the 
manual does not reference your problem or your problem is not solved by reading the manual, 
you may call 

MFJ Technical Service

 at 

601-323-0549

 or the 

MFJ Factory

 at 

601-323-5869

.  

You will be best helped if you have your unit, manual and all information on your station 
handy so you can answer any questions the technicians may ask. 
 
You can also send questions by mail to MFJ Enterprises, Inc., 300 Industrial Park Road, 
Starkville, MS 39759; by FAX to 601-323-6551; or by email to [email protected].  
Send a complete description of your problem, an explanation of exactly how you are using 
your unit, and a complete description of your station. 
 

MFJ-259 PARTS LIST 

 

Designator

 

Description

 

Part Number

 

BH1 

Battery Holder, 4-AA 

730-2342  

BS1 

Battery, Snap, 9v, 8"  

730-3005  

C1 

Capacitor, Disc Ceramic, 50v, 20%, 22 pF 

200-0018  

C11,C13,C14,C16, C19  Capacitor, Disc Ceramic, 25/50v, 20%, .01 

µ

F 

200-0004  

C17,C18,C24 

Capacitor, Disc Ceramic, 50/100v, 20%, .1 

µ

F 

200-0005  

C2,C3,C4,C15,C6, 
C7,C8 

Capacitor, Disc Ceramic, 25/50v, 20%, .01 

µ

F 

200-0004  

C20,C21,C25,C26, C27  Capacitor, Disc Ceramic, 25/50v, 20%, .01 

µ

F 

200-0004  

C22,C23,C40,C39 

Capacitor, Disc Ceramic, 25/50v, 20%, .01 

µ

F 

200-0004  

C28 

Capacitor, Electrolytic, Radial, 25v, 100 

µ

F 

203-0015  

C29 

Capacitor, Disc Ceramic, 500v, 20%, 75 pF  

200-1011  

C30 

Capacitor, Disc Ceramic, 1 kV, 20%, 470 pF 

200-2023  

C31 

Capacitor, Disc Ceramic, 1 KV, 20%, 33 pF  

200-2016  

C32 

Capacitor, Electrolytic, Radial, 50v, 1 

µ

F 

203-0006  

C33,C36,C10 

Capacitor, Disc Ceramic, 25/50v, 20%, .01 

µ

F 

200-0004  

C38 

Capacitor, Electrolytic, Radial, 35v, 220 

µ

F 

203-0019  

C44 

Cap, Air Var, 6-200pf  

204-5160  

D2-D4 

Diode, Germanium, 1N34A  

300-8001  

For C44, SW1 

Knob, 1/4" Shaft 

760-0033  

For IC1 

Socket, IC, Low Profile, 14 Pin  

625-0031  

For SW2 

Knob, Plastic, Push-Button, Red  

760-2140  

IC1 

IC, Op-amp, Quad Op-amp, 14 Pin, Lm324n  

311-0040  

IC2 

Voltage Regulator, TO-220, 1 Amp, 7805T  

307-1011  

J2 

Connector, Header, 90, 3 Pos 

612-0103  

J3 

Connector, Socket, Dual Row, 7 Pos  

612-3307  

J4 

Connector, UHF, 4-hole Mount, SO-239  

610-2005  

Содержание MFJ-259

Страница 1: ...Finding a Short Circuit in Coax Cables 8 Testing and Tuning Stubs and Transmission Lines 8 Velocity Factor of Transmission Lines 9 Impedance of Transmission Lines 10 Estimating transmission line loss...

Страница 2: ...Hz 26 2 62 5 MHz 62 5 113 MHz 113 170 MHz The MFJ 259 can be used to adjust or measure the following Antennas SWR resonant frequency bandwidth efficiency Antenna tuners SWR frequency Amplifiers Input...

Страница 3: ...lts BATTERY INSTALLATION If batteries are used they must be installed by removing the 8 Phillips head screws on each side of the case The eight batteries fit in two separate battery holders with the p...

Страница 4: ...g of 1 1 The common misconception that 25 ohms of reactance and 25 ohms of resistance in a load will give a 1 1 SWR is absolutely untrue The actual SWR in this condition will be measured as 2 6 1 The...

Страница 5: ...evice under test WARNING Never apply power to the ANTENNA connector To measure the SWR of a 50 ohm coaxial line simply connect the line to the ANTENNA connector The counter input should be set to A Pr...

Страница 6: ...ter The frequency counter in the MFJ 259 will typically measure frequencies between a few hertz and 200 MHz At frequencies above 1 MHz the frequency counter is sensitive to 600 mV Below 1 MHz the coun...

Страница 7: ...for a lossy cable Hard line is not usable since there is no leakage The leakage from the cable is usable under normal conditions for a low level counter input Experimentation will be needed to determi...

Страница 8: ...turers down play the importance of good radial systems with grounded verticals If you have a good ground system the SWR of a quarter wave vertical can be nearly 2 to one The SWR generally gets BETTER...

Страница 9: ...FJ 259 input 2 Turn on the MFJ 259 and start sweeping the frequency starting at the low frequency end of its range Watch the RESISTANCE METER for a dip reading and record the frequency for zero ohms 3...

Страница 10: ...ncy Velocity Factor of Transmission Lines The MFJ 259 can accurately determine the velocity factor of any impedance transmission line Measure the velocity factor with the following procedure 1 Disconn...

Страница 11: ...nd of the FREQUENCY range selected 5 Adjust the potentiometer until the SWR reading varies as little as possible over the TUNE range Note that the value of the SWR is not important Only the change in...

Страница 12: ...alls on a calibration mark At 60MHZ the meter reads 3 1 SWR Using the chart you know that the loss is 3 dB Since 28MHz is about half of 60MHz you can multiply 3dB by 7 which gives a loss of about 2dB...

Страница 13: ...ork with the tube in an operating condition with the low level of RF from the MFJ 259 TESTING RF TRANSFORMERS RF transformers that are designed with a 50 ohm winding can be easily and accurately teste...

Страница 14: ...andard value capacitors and inductors These should be collected and tested for accuracy MFJ suggests the following sets of values Inductors 330 H 56 H 5 6 H 47 H Capacitors 10 pF 150 pF 1000 pF 3300 p...

Страница 15: ...ow SWR 4 Solve this equation using F as the resonant frequency and C as the capacitance of the standard capacitor L H 1 00003948F C F MHz C pF 2 RESONANT FREQUENCY OF TUNED CIRCUITS The MFJ 259 can be...

Страница 16: ...ermining the resonant frequency is by using a small three or four link coil to magnetically couple to a tuned circuit for testing The coil should be wound around the inductor in the tuned circuit This...

Страница 17: ...ramic 50v 20 22 pF 200 0018 C11 C13 C14 C16 C19 Capacitor Disc Ceramic 25 50v 20 01 F 200 0004 C17 C18 C24 Capacitor Disc Ceramic 50 100v 20 1 F 200 0005 C2 C3 C4 C15 C6 C7 C8 Capacitor Disc Ceramic 2...

Страница 18: ...Q4 Transistor FET To 92 Siliconix J310 305 6310 Q3 Transistor FET Switching VN10KM 305 6005 Q5 Transistor HF Wide Band To 39 NPN 2N5109 305 0017 R1 Resistor 1 4 Watt 5 Film 18 Ohm 100 1180 R10 Resist...

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