The MFJ-259B RF analyzer is a compact battery powered RF impedance analyzer. This unit combines four basic circuits; a 1.8-170 MHz variable frequency oscillator, a frequency counter, a 50 ohm RF bridge, and an eight-bit micro-controller. This unit makes a wide variety of useful antenna or impedance measurements, including coaxial cable loss and distance to an open or short.

Primarily designed for analyzing 50 ohm antenna and transmission line systems, the MFJ-259B also measures RF impedances between a few ohms and several hundred ohms. It also functions as a signal source and frequency counter. The frequency range of impedance measurement is 1.8 to 170 MHz, in six overlapping bands.

Requires 10 AA size batteries for portable operation (not furnished).  See "Suggested Parts" above for AC adapter and accessories. 

MFJ-259B Antenna Analyzer Instructions (767K pdf)

The MFJ-259B measures and displays the following
 

●Cable length (feet) Impedance phase (degrees) Resonance (MHz) ●Cable Loss (dB) Inductance (uH) Return loss (dB)

●Capacitance (pF) Reactance or X (ohms) Signal Frequency (MHz)

●Impedance or Z magnitude (ohms) Resistance or R (ohms) SWR (referenced to 50 ohms)

The MFJ-259B can be used to adjust, test, or measure the following:

●Antennas:  SWR, impedance, reactance, resistance, resonant frequency, and bandwidth

●Antenna tuners:  SWR, bandwidth, frequency

●Amplifiers:  Input and output matching networks, chokes, suppressors, traps, and components

●Coaxial transmission lines:  SWR, length, velocity factor, approximate Q and loss, resonant frequency, and impedance

●Filters:  SWR, attenuation, and frequency range

●Matching or tuning stubs:  SWR, approximate Q, resonant frequency, bandwidth, impedance

●Traps: Resonant frequency and approximate Q

●Tuned Circuits:  Resonant frequency and approximate Q

●Small capacitors:  Value and self-resonant frequency

●RF chokes and inductors:  Self resonant frequency, series resonance, and value

●Transmitters and oscillators:  Frequency

LIMITED 12 MONTH WARRANTY

MFJ Enterprises, Inc. warrants to the original owner of this product, if manufactured by MFJ Enterprises, Inc. and purchased from an authorized dealer or directly from MFJ Enterprises, Inc. to be free from defects in material and workmanship for a period of 12 months from date of purchase provided the following terms of this warranty are satisfied.

1. The purchaser must retain the dated proof-of-purchase (bill of sale, canceled check, credit card or money order receipt, etc.) describing the product to establish the validity of the warranty claim and submit the original or machine reproduction of such proof of purchase to MFJ Enterprises, Inc. at the time of warranty service. MFJ Enterprises, Inc. shall have the discretion to deny warranty without dated proof-of-purchase. Any evidence of alteration, erasure, or forgery shall be cause to void any and all warranty terms immediately.

2. MFJ Enterprises, Inc. agrees to repair or replace at MFJ's option without charge to the original owner any defective product under warrantee provided the product is returned postage prepaid to MFJ Enterprises, Inc. with a personal check, cashiers check, or money order for $7.00 covering postage and handling.

3. This warranty is NOT void for owners who attempt to repair defective units. Technical consultation is available by calling the Service Department at 662-323-0549 or the MFJ Factory at 662- 323-5869.

4. This warranty does not apply to kits sold by or manufactured by MFJ Enterprises.

5. Wired and tested PC board products are covered by this warranty provided only the wired and tested PC board product is returned. Wired and tested PC boards installed in the owner's cabinet or connected to switches, jacks, or cables, etc. sent to MFJ Enterprises, Inc. will be returned at the owner's expense unrepaired.

6. Under no circumstances is MFJ Enterprises, Inc. liable for consequential damages to person or property by the use of any MFJ products.

7. Out-of-Warranty Service: MFJ Enterprises, Inc. will repair any out-of-warranty product provided the unit is shipped prepaid. All repaired units will be shipped COD to the owner. Repair charges will be added to the COD fee unless other arrangements are made.

8. This warranty is given in lieu of any other warranty expressed or implied.

9. MFJ Enterprises, Inc. reserves the right to make changes or improvements in design or manufacture without incurring any obligation to install such changes upon any of the products previously manufactured.

10. All MFJ products to be serviced in-warranty or out-of-warranty should be addressed
MFJ Enterprises, Inc.
300 Industrial Park Road
Starkville, Mississippi 39759
USA
 
and must be accompanied by a letter describing the problem in detail along with a copy of your dated proof-of-purchase.

11. This warranty gives you specific rights, and you may also have other rights which vary from state to state.

Part #	Part Name	Ship By	Price	Add to Cart
MFJ-1312D	MFJ 12 VDC 500mA AC Adapter w/ 2.1mm Plug	Ship Monday	$ 15.50
MFJ-29C	MFJ Carrying Pouch w/ Window for MFJ-209/MFJ-249/MFJ-259B	Ship Monday	$ 23.95
MFJ-66	MFJ Dip Meter Coil for MFJ HF/VHF Analyzers This part is currently out of stock, but you should order it now to assure early delivery. Your credit card will not be charged until the item is shipped.	Available Soon	$ 23.95
MFJ-731	Tunable RFI Filter for MFJ Antenna SWR Analyzers	Ship Monday	$ 89.95
MFJ-99	MFJ-259B Accessory Pack: MFJ-66, MFJ-29C, MFJ-1312D	Ship Monday	$ 57.95