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MFJ-259 Instruction Manual 

HF/VHF SWR Analyzer 

17 

 

Designator Description 

Part 

Number 

J5 

Jack, 2.1 mm,  DC Coaxial Jack 

601-6021  

J6 

Connector, BNC, Chassis Mt. Female, UG-652/U 

610-1016 

JMP1-JMP3 

Wire, Jumper, 1/4"-2"  

870-5000  

L1 

Inductor, Var,  66 

µ

H  

402-3412  

L2 

Inductor, Xformer, 1 7.8 

µ

H 

402-3406  

L3 

Inductor, Xformer,  1.8 

µ

H  

402-3402  

L4 

Inductor, .211 

µ

H  

402-2728  

L5 

PCB Coil, Air Wound, 4 Turn 

10-01014  

L6 

PCB Coil, Air Wound, .5 Turn  

10-01011  

L7 

Pick-up Coil, #61 Pre-wound 

10-01003  

M1 

Meter, 100 uA, SWR Meter  

400-0035  

M2 Meter, 

Resistance 

400-0045 

MOD1 

Counter Module, LCD  

50-247-3  

P2 

Connector, IDC, Socket, 3 Positions  

612-2003  

PCB 

PCB, 2-side, MFJ-259 

862-0249  

Q1,Q2,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 

Resistor, 1/4 Watt, 5%, Film, 39k Ohm  

100-4390  

R15,R24,R29,R30 

Resistor, 1/4 Watt, 5%, Film, 10.0k Ohm  

100-4100  

R17,R32 

Resistor, Trimpot, Sub. Horz., 10 K  

133-4100  

R18 

Resistor, Trimpot, Sub. Horz., 100 K 

133-5100  

R2,R21,R22 

Resistor, 1/4 Watt, 5%, Film, 1M Ohm 

100-6100  

R26,R27,R28 

Resistor, 1/8 Watt, 1%,49.9 Ohm  

102-1499  

R3,R8 

Resistor, 1/4 Watt, 5%, Film, 100 Ohm  

100-2100  

R33 

Resistor, 1/4 Watt, 5%, Film, 620 Ohm  

100-2620  

R4,R7 

Resistor, 1/4 Watt, 5%, Film, 10 Ohm 

100-1100  

R5,R6 

Resistor, 1/4 Watt, 5%, Film, 1.0k Ohm 

100-3100  

R9 

Resistor, 1/4 Watt, 5%, Film, 100k Ohm 

100-5100  

SW1 

Switch, Rotary, 2p6p 

500-1565  

SW3,SW4 

Switch, Push Button, spst 

504-1003  

SW2 

Switch, Push-Button, 2p2p  

504-0022  

 
 
 
 
 

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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