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

Works like a dream !!!!

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.

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

Item shipped and arrived as scheduled, but product was defective and I have returned it for refund. Bought it to replace an MFJ-949 tuner than died (balun burned up). New, defective tuner would not tune existing antenna on any bands. Adjustments of inductor nor either capacitor had any effect on any band. Either the built-in SWR meter is bad or, more likely, the tuner itself.

Good product, I use it to tune multiband antennas

Cumple con las espectativas, muy útil para DX en HF todas laa bandas, genial.

easy to use and works as described. tnz NoQES

works beautiful on vertical antennas, able to most often get 1.2 or less. Forward power sometime falls below 100 but better than blowing my finals.

GOOD YO GO!

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 .