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MFJ Instruction Manual. HF/VHF SWR Analyzer. 1. MFJ HF/VHF SWR ANALYZER. INTRODUCTION. The MFJ SWR Analyzer is an easy to operate . Downloaded by. Page 2. Page 3. Page 4. Page 5. Page 6. Page 7. Page 8. Page 9. Page Page Page Page Page Page MFJ Instruction Manual. HF/VHF/UHF SWR Analyzer. MFJ SWR HF/ VHF ANALYZER. TABLE OF CONTENTS. Warning: READ SECTION BEFORE.

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Quiescent current bias in the RF amplifier section is adjustable.

Mfj 259b manual likely are poor solder joints, but check solder joints first. Any one of the mvj will do the job. Watch for missing or mfj 259b manual hardware.

All voltages are converted through an eight-bit A-D converter to a bit digitized output with a test-display range of bits. Alternatively, you can watch Vz on the test mode display. Proper adjustment should be accomplished by watching distortion, the best indicator of which are harmonics.

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L6 oscillator squeeze-spread tunes from below Since it is designed to be inexpensive and simple, and since mrj design is aging now, there are a few mfj 259b manual with this system. Connect the analyzer exactly as shown below.

Show More Show Less. Since the loads are used to mfj 259b manual the number of bits in critical calculations, the maximum reactance error will always be worse than the percentage of resistive load error. The analyzer is terminated in a low impedance, which places the highest load on the RF amplifier.

mfj 259b manual Because of that, large antennas should be tested at times when propagated signals in the range of the antenna’s response are at minimum strength. I mmanual find opens and cuts in my trunk cables, some cables are feet long, within a few feet.

By knowing mfj 259b manual ratio of these voltages, as compared to the AGC regulated RF source voltage, many different load parameters can be calculated. But it is handy for building traps or tuning matching element.

Observe the analyzer frequency reading. Inductors L5 and L6 are located on the component side of the board and are compression-tuned press turns mfj 259b manual together to lower frequency or spread apart to raise frequency.

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You must remove the switch indexing tab retainer nut and the metal switch retainer stop under the nut. Using the mannual size or worn tuning tool may stress and crack a tuning slug.

The best place to spray mfj 259b manual switch is from the front side shaft sideright below the nut. This unit also has meter calibration adjustments. Dead spots generally indicate a defective tuning capacitor TUNE. I reviewed, modified, and edited that work. This also why bits must be calibrated for near-perfect accuracy. Make only very small corrections– especially to L5 or L6 –and recheck the mfj 259b manual you are adjusting.

Follow these rules the mfj 259b manual time you have the unit apart! Multiple-section filters behave like transmission lines of random line impedances, loss, and electrical length as frequency is varied.

Proper alignment requires a This method can be unreliable, and can cause stub and DTF distance to mfj 259b manual errors. In order for the detectors to be accurate within a fraction of a percent one bitdetector diodes must have very low capacitance and very low threshold voltage.

MFJ-259B Analyzer Mini-Manual

If you use a receiver for adjustment, be sure the receiver is tuned to the second harmonic of the MFJB, and 2259b the receiver mfj 259b manual not being overloaded by the MHz fundamental signal. Some MFJ manuals were re-written and distance-to-fault measurement mfj 259b manual errors were introduced.

They are good solid units and take a beating in the field. You should also check the 295b lower band after each adjustment to ensure that the lower band hasn’t moved excessively.

MFJ 259B Hf/vhf SWR Analyzer Instruction Manual

Excessive harmonics can cause severe errors in measurement of frequency-selective loads, even when dummy-load SWR tests appear perfect. You have now set initial rough settings for all three detectors, proceeding to impedance calibration loads. The C has the best bat access and longer bat life. You should clearly see the MFJ analyzer’s fundamental frequency output voltage Vz mfj 259b manual through a deep null.