How to repair an amateur radio mfj949c antenna tuner. The manual was written in by mfj and applied to mfj207. Rugged construction the mfj225 has the same tough all aluminum mfjstyle enclosure youve come to rely on in the field and on the bench. While some tncs do not need nor allow calibration, the workhorse of most packet networks do. Mfj 4230mv has an excellent 75% efficiency and extra low ripple and noise, 100 mv.
I have plenty of gear in the shack to lashup the signal generator and a return loss bridge, but i have not yet built it into a single box that is easy to use. The mfj1270b, 1270c, 1274 and 1276 radios offer both 1200 and 300 baud operation as well as optional modems to run at 2400, 4800 or 9600 baud. Describe your experience with the mfj207 hf swr analyzer and tell us why you give it the rating you did required. This pin is brought out to a feedthrough on the tnc 2 pc board near pin 1 of the serial connector. The mfj822 is the same meter, but for hf2m covering 1. Resistors usually come in multiples of 10, 20, 50 or 100, all of the same value.
My mfj 259b has been a valued tool that i have used for many years and still use it. They may also be used to adjust a tuner to match your antenna without the need for transmitting find mfj 207 swr analyzers mfj207 and get. Same as the mfj249, but without the lcd frequency counter. I just acquired an mfj 207 antenna analyzer and bought a digital readout frequency counter that i have connected to the mfj. Introduction the box can be tested completely after assembling with the battery holder initially unassembled. The mfj207 gives you a direct readout of your antennas swr without the need for formulas or indirect readings.
Since purchasing an mfj207 in the early 90s, i havent been without one of these pieces of equipment. Just plug in your coax to find the swr of any hf antenna on any ham band from 10160 meters 1. The mfj207 will help you build antennas that will make working dx almost routine. Mfj 259 out of production mfj 259b out of production. Blonder tongue btsa8558c spectrum analyzer in very good condition 0.
Mfj antenna analyzers free shipping on most orders over. It is not electrically connected anywhere else on the tnc circuit board. This is an mfj procedure that does not contain any information that would not be handed out by them. Has an rca phono jack for external frequency counter. If all you want to do is look for an swr dip, most any antenna analyzer will do. Mfj207 swr analyzers give you a direct readout of your antennas swr without the need for formulas or indirect readings. Your analyzers calibration plane is the point of reference where all measurements have greatest accuracy gain reference 0db and phase shift 0 degrees. This link is listed in our web site directory since wednesday may 20 2015, and till today mfj259b calibration has been followed for a total of 500 times. You see, i thought i could now run 6m without going through my mfj941e antenna tuner. I needed an antenna analyzer that has two added features the old 259b does not have. Mfj 207 hfvhf swr analyzer thank you for purchasing the mfj 207 hfvhf swr analyzer. Frame ground is provided for attachment to the chassis of the tnc and the chassis of the attached device computer or terminal. Mfj 259b analyzer calibration university of adelaide. In this page you find schematic, users and instructions manuals, service manuals, technical supplement, leaf leads and other good stuff.
For simple handheld analyzers like the mfj259c, the calibration plane is always located at the analyzers rf connector. I havent been without one of these pieces of equipment. The mfj207 can also be used to adjust a tuner to match your antenna without the need for transmitting. Listed under the radio equipmentantenna analyzersmfj259b category that is about mfj259b. Used anritsu sitemaster waveguide adapter kit wr7 asis. If you can afford both, then by all means, buy them. The mfj209 swr analyzer provides continuous coverage from 1. A simple frontpanel pushbutton switch lets you choose either ampmeter or voltmeter allows you to select amps or volts as you wish to read them.
The mfj207 10160 meter antenna swr analyzer gives you a direct readout of your antennas swr without the need for formulas or indirect readings. The impedance is computed from vx, v1 and v2 broadband detectors make it susceptible to interferences. However, the mfj225 uses builtin firmware to perform its entire calibration routine in less than a second. I have an mfj 945e tuner with the built in cross swrpower meters i have grounded the tuner via the gnd screw on the back of the unit to a good ground anyhow. Mfj207 mfj 207 mfj207 pdf user manual for mfj207 mfj 207 mfj207. The main category is mfj259b antenna analyzer that is about mfj259b. The mfj207 will help you build antennas that will make working dx almost. This equipment generates and uses radio frequency energy and if not installed and used properly, that is. This calibration procedure is the correct procedure for later mfj259bs. Antenna system measurements with the mfj202b rx noise bridge rx noise bridge calibration and applications in measurement of an antenna and a zip cord transmission line by dr. The dial calibration is only approximate and is for reference only. Measures coax losses measures capacitance and inductance measures impedance magnitude, rl, refco.
An initial pcb precalibration procedure is assumed the operations indicated in the procedure can be followed under normal conditions. For basic handheld units like the mfj259c, the calibration plane is always fixed at the analyzers rf connector. Mfj enterprises inc,ameritron,hygain,hygain,cushcraft,vectronics,mirage,mfj,mfj enterprises,antenna,radio,ham radio,amateur radio,tuner,analyzer,starkville,amplifier. A phono connector is provided for an external frequency counter. Review of the array solutions aim 4170 antennalab rf. Mfj207 instruction manual hf 10160m swr analyzer disclaimer information in this manual is designed for user purposes only and is not intended to supersede information contained in customer regulations, technical manualsdocuments, positional handbooks, or other official. Ive used several calculators online to ensure that the number of turns are correct for the t686 cores that im using. One of the newest antenna analyzers on the market is the array solutions aim 4170, designed. I purchased the mfj 207 as it looked like a nice and simple instrument for quick tuning of hf antennas in the field. About mfj259b calibration the resource is currently listed in in a single category. The manual was created in pdf format with the filename of mfj207. Other useful information would include your experience with similar products, infomation on a product that you would purchase instead of this one, and so on. The frequency coverage for the mfj207 is approximately from 1. Mfj207 hfvhf swr analyzer thank you for purchasing the mfj207 hfvhf swr analyzer.
Mfj207 hfvhf swr analyzer thank you for purchasing the. My antenna is tuned for the ssb segment of the band, so i should. So far no one has rated yet, so be the first to rate this link. It is easyaccess to a test procedure, that is all it is. All information, images, and documents on this website are the sole property of mfj enterprises, inc. The software we will be using is called spectrogram. Desolder then measure the resistance of the original compromised resistor. The mfj 207 gives you a direct readout of your antennas swr without the need for formulas or indirect readings. Mfj 259c may, or may not have the same cal procedure as. Mfj enterprises inc,ameritron,hygain,hygain,cushcraft,vectronics,mirage, mfj, mfj enterprises,antenna,radio,ham radio,amateur radio,tuner,analyzer,starkville,amplifier. The mfj207 i use just to rough tune an antenna in the field, or as a cheap unit to loan out in case it gets damaged, lost, or stolen.
Since mfj259b firmware has several versions under the same model number, you may find some final performance or. But the mfj212 noise bridge has the necessary switching and none of the instability problems for the same price for this function. Now that i know the characteristics of my cushcraft ringo 6m vertical antenna, i wanted to see if my mfj860 swr wattmeter was any good. Mfj 259b analyzer calibration this is an mfj procedure that does not contain any information that would not be handed out by them. More accurate than the mfj 207 diode detectors are often used. Mfj 207 swr analyzers mfj207 free shipping on most. Mfj 259 antenna analyzer calibration, problems, and. Simply initiate the calibrate command and youre done. It can be used to find the resonant frequency of your antenna and gives you a direct readout of the antenna swr. Due to tolerance, a resistors value can be slightly off. If you cant, then personally, id wait and save my money for. This information is here only because it is the correct way to calibrate the mfj259b analyzer. Non linearities limit dynamic range and must be calibrated out. I have a half wave 40 meter dipole that i am trying to adjust for resonance.