MFJ-941E MFJ941E MFJ Enterprises Original HF Antenna Tuner with Mini Cross Meter, 300 Watts

A VERY POPULAR TUNER WITH HAMS. MAX WATTAGE IS 300W AND KNOBS CAN BE A BIT TOUGH. GREAT FOR STANDARD WATTAGE RIGH (100) AND QRP.

Tunes my antenna system quite well. Easy to learn how to get the capacitance and inductance working together to achieve good SWR. I use it to tune my dipole antennas so that Im not having to take them down and put them back up over and over again while trimming them.

Great product. Does everything it is advertised to do. Very happy with its performance

Works great. Tunes my antenna quick and easy. You could probably tune your rain gutters or a coat hanger with this tuner.

The product overheats with just 200 watts out of the stated 300 watts it should handle , and it starts allowing the swr to rise . Not a good product for the serious talker .

I am disappointed given the good reviews this tuner got. The wattmeter was not calibrated when arrived. it was off by about 20%. Isnt it supposed to have been done before it left the factory? Also, the reading differs by about 10% between 10m and 20m when the same power is used in both bands. I do not have a chance to try the tuning function yet.

I use it to tune my stealth inverted V. My homebrew tuner cant tune it on 80, so I hoped this tuner would do the trick. It was not able to achieve much of a match (~5:1 SWR) on 80 but tunes it well on 40 - 10 meters. Switched inductor and nice dials on the capacitors make it easy to return to settings when switching bands. Crossed needle meter makes it easy to see if you are adjusting in the right direction. Multiple antenna selections are handy. I didnt have a chance to try it on a balanced line antenna yet. I dont have instrumentation to assess its losses, but I was able to work several stations on each of the working bands with modest power (~80 W, not bad for a low inverted L (about 20 ft off the ground). I have some ideas to try to get the antenna working on 80m, some of which are suggested in the manual. Speaking of the manual, its only available online, and is downloadable. So, I tried feeding the coax feed as a single conductor (shield is connected to ground rod at far end, so its hard to predict what impedance that reflects to the tuner). The MFJ was able to get a good match with that. I also tried using my homebrew tuner in cascade with the MFJ, hoping the h.b. tuner would push the impedance within range. That almost worked, but not as well as feeding it as a single conductor. No QSOs on 80 m yet, so still not sure how well it works, but SWR is below 1.5 so Im optimistic. A single gripe and a suggestion or two. The meter LED blew out when coupling to a difficult load. RF coupled into it, and incinerated it with smoke evident. I suggest adding a series resistor and bypass capacitor at the LED to reduce likelihood of recurrence. I also added small bypass capacitors to the meters, to better protect them from RF and reduce their tendency to follow the audio on SSB. It should make them last longer. I rewired the Balun to a 4:1 un-un. This allowed the tuner to match higher Z loads, but you lose the balanced-line feed so it depends on what youre going to feed with it. Im going to drill a small hole in the rear panel and add a DPDT switch so I can select both configurations, but dont have the tools to do it here at my vacation QTH. Im not sure how much power it can handle as an un-un, but it had no problem with my 80W transmitter.

accurate

Works great. I still dont know why Canadian distributors are asking over twice the retail price for the same thing.