Malahit ATU-100 EXT Antenna Tuner 1.8-50MHz atu100 by N7DDC 7x7 0.96 Inch OLED 3.2 Firmware Programmed with Housing Assembled Machine with USB Cable（No Battery） Compatible with Radio Antenna

Thank you David, N7DDC for a great working tuner. The tuner arrived one day after I ordered it.This is a quality unit and tuned a Delta Loop antenna on 80, 40 and 20 meter bands.I installed the tuner with in 5 minutes. Well worth the price.

Most excellent - it has the qrp settings perfect ! It tunes great ! It works better than any other tuner I bought in similar range and built much better / it’s a champ !! I wish I had 3 of these

Ive only used it on 20 and 40 meters. But, I'm thinking it will bring the SWR down to 1.5 on a barbed wire fence. Its so simple to use and it really does bring the SWR to a good operating level without any manual tuning at all. I'm very happy with this purchase.

the atu arrived in a small box with decent packaging... i have no idea of what the included USB barrel cable is for, as there is no documentation - there is no manual, no errata sheet, but you will get a power cable the good: solid construction no internal battery (i consider this a plus) no rattles unit powered up unit functions properly firmware provides SWR, impedance info, and FWD power buttons respond to presses most important: firmware is the latest 3.2 version even more important for QRP ops: the PIC firmware has been modified to initiate tuning at 1W power levels the bad: due to poor documentation, you may find operation erratic/confusing (i was able to figure it out) due to poor ducumentation, you may not understand displayed information (bypass, autotune mode on/off) no weather-proofing using a lexan cover over the OLED - be careful of rain drops no rubber feet or flip-up front feet use of UHF connectors (most ops nowadays prefer BNC) as this is touted as a compact unit for /P operation interesting note: i did find the unit to work with a single fresh 9V alkaline battery this product is recommended from this seller (Malahit)... but *beware* of other sellers here on the wild marketplace - you could get burned with a defective unit with older firmware and 10W tuning requirements i tested this tuner this morning using a 20-yr-old vintage W6MMA manual screwdriver... contacts in MA, TX, and WI using 9W on a new 705 QRP rig... i will do further testing with longwires and portable dipoles i like this tuner - it is smaller than my previously favorite QRP tuner, the legendary LDG Z11

This thing works great. I just leave it on the automatic setting and it quickly tunes for each band. The built-in power meter and SWR display are super handy, and so is the antenna efficiency reading. It can't work miracles, but it does make my antenna usable on a couple of bands it doesn't cover well. It comes with a plug and a USB-C board to power it, but I ended up just using a 12V wall wart to power it instead since that seemed simpler.

Run away from this junk. Got stuck in tune mode. Couldn't get it out. Good thing my radio has SWR protection to disengage transmitter when SWR is high.

I bought this to use with my IC-706 series radios. It works well. I also used it with my FT-897 Yaesu recently to tune a stubborn trap multi band dipole. I have the FC-30 that is a match to the Yaesu, but it doesn't like severe mismatches (others have noted this also). This tuner worked well in its place and tuned well beyond the limitations of the FC-30. I was able to make some contacts with it in the portable environment I was using. I had no RF problems, and it tunes fairly quickly. With the Yaesu, I powered the output down and changed the mode to safely engage the tuner. With the IC-706 series, I have the tuner plug in adapter installed and it works by just pressing the tune button. I have included a photo with it setup beside one of my older IC-706 radios in the radio room. i am pleased with the product and will probably purchase another one.

I have been waiting for an affordable small ATU that I can use portable and in the shack, and this one fits the bill. I was very pleased with how well this tuner worked with my 84' random wire (w/9:1 UNUN). It is fast and I can change bands and it locks in pretty close to 1:1 (less than1.5) every time. On occasion it may land on 1.8:1 and I will press the tune button to fish for a lower SWR, no prob. I run about 15-35w. It does it's thing, you rarely will have to press any buttons. The display is great, it shows you just you want to know. The only issue I had was, I had to order new PL-259 to BNC adapters because the ones I had would not seat the center lead (it could rotate in sleeve). I then ordered (Amazon B07QVY5TSL) and perfect fit. I have been using practically every day for about a month waiting for malfunction, -none- it has been solid. (I would recommend.) Here are my boxes: 1. Covers 1.8 to 55MHZ 2. Needs only ~1w to initiate tune up. (Tune progressively in watts as you increase). 3. Works also at 100w 4. Low current draw 5. Tunes quickly 6. Not wait a month to ship from China (this guy was there in no time). Update: FYI, I have been using this little ATU almost everyday for about 3 months with no problems. Once it got confused (caused by me), and a power-cycle cleared. Never messed with the "testing" features (but nice to have). For years I used an MFJ-949 and wasted time with knobs peaking, this is a breeze. I have found that this ATU-100 EXT with AUTO and BYP is useful. For CW, tune up and tap AUTO to lock in on match, vs. accidental re-tuning in QSO. Also BYP bypass in nice to check other bands or no tuner using straight antenna. For $100, I recommend.

Apenas lo estoy probando y en 1 día de uso ha cumplido excelente con su función

Way better than expected awesome little tuner.

Using this tuner for portable or mobile operation and working very good for me. However, The wide 15m band is bit difficult to match whole band with my antenna -- depends on your antenna system --. Also, SO-239 connectors are JIS type-M connector (16mm) and thread pitch is not same as unified UHF connector. If you are North American operator, just change stock SO-239 connectors to unified SO-239 (5/8"). 73 GL

sehr gute Ware

Fast tuning, clear display, shows power and match, just plain works great threw all the bands it is suppose to, great addition to the shack.