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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I think this occurred sometime aroundbut was later corrected.

This page is the most current result. I’m not sure if any other errors were introduced in the manual rewrite.

Before, during, and after calibration, be mindful of physical condition. This adjustment directly affects output signal mfj 259b manual content. Measurement errors in stubs and cable lengths will mfj 259b manual if the harmonic null is not adjusted correctly in the B or ! There are multiple reasons why, at the time of design, these units were dc coupled with broadband detectors. L6 oscillator squeeze-spread tunes from below The manusl is frequency spacing between impedance minimums, when converted to half wavelengths, is the distance to an open or short.

If you know your unit has been tampered with, preset trim pots R88R8925b R90 to their center positions mfj 259b manual continuing.

MFJ-259B Analyzer Mini-Manual

Entering the test mode is described in Detector Calibration Mfj 259b manual 6. If you must clean and lubricate the switch, be aware mf is a difficult task. Watch for missing manuak loose hardware. It is best to calibrate at typical lower expected battery voltage. Consequentially, if the ‘s total Vz and Vs exceedsthe display indicates reactance.


Never apply external voltages greater than 3 volts to the antenna port! This critical sequence calibrates A-D conversion for various load conditions. I see selling for the same price as mvj b and c models. These steps will mfj 259b manual parameters that do not appear on the display. The lowest-priced mfj 259b manual that has been used or worn previously.

I developed the distance to fault and stub length functions.

MFJ Antenna Analyzer Operation Guides

Since the bridge depends on nulls, any external voltage will throw off readings. Any one of the s will do the job. Dead spots generally indicate a defective tuning mfj 259b manual TUNE. I use male BNC connectors with the locking sleeve removed, with surface mount resistors.

MFJB SWR Analyzer

Before proceeding, be sure you mfj 259b manual printed a copy of the board layout showing adjustment points, have read all this, and have suitable loads. I could not have done it without a analyzer.

All voltages are converted through an eight-bit A-D converter to a bit digitized output with a test-display range of bits. Mfj 259b manual SURE the fundamental frequency level remains nulled in the stub, if a stub is used.

Small set of mmfj alignment wands for coils, and small jeweler’s screwdrivers for controls.

This is accomplished by setting the analyzer to mid-HF, generally around 15 MHz. Since the loads are used to 259h the mfj 259b manual of bits in critical calculations, the maximum reactance error will always be worse than the percentage of resistive load error.


L5 oscillator squeeze-spread tunes from below Low-bit adjustments compensate diode linearity at low voltages.

Also these units do not display a graph or allow mfj 259b manual to download data to a computer. Three or four nanual diodes will reduce voltage below 12 volts. Acceptable results will be obtained when load resistors are mounted in the very bottom of a UHF-male connector. Hopefully someday a higher cost-design with selective detectors will become available, but for right mfj 259b manual this is all that is available for amateur use from any manufacturer.

Mfj 259b manual analyzer is terminated in a low impedance, which places the highest load on the RF amplifier. After verifying calibration with all loads, carefully reassemble your manuwl analyzer. Manusl a detector suddenly shifts voltage, the problem is almost certainly a defective detector diode.

All higher ranges affect lower bands, with the adjacent higher band having the largest effect. They are good solid units and take a beating in the field. Together, the low-bit and high-bit adjustments compensate diode linearity, making detector system output voltages closely track actual RF voltages appearing across mfj 259b manual resistors.

To enter Test Mode:.

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