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

This thing works like a champ for my POTA Go Box. I use it to fine tune my antenna when I change bands. The tuner is well made in a nice aluminum casing... I expect that it will last for many years to come.

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

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 display lights up, goes through the motions, but no tuning occurs. I have exhausted all the troubleshooting steps I can find online. There seems to be a significant number of people having the same problem as I am having with this unit. It seems that when it works, it'll tune a bathtub, but getting one that works can be a crapshoot. I didn't get around to testing it fast enough and the return window has closed. I guess I am out $88. Can someone post a clear image of the inside of the front panel? I believe mine is missing a wire and two capacitors.

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.

Excellent tuner. I'm in second-floor multifamily apartment, so my antenna options are limited. I convinced the landlord to let me run the wire from an end-fed antenna down the outside of the house and around the corner. Not ideal. I was having no luck making contacts on HF, so I picked up this little guy. I'm using a Yaesu FT-991A with a no-name end-fed with baluns. After I installed it, I was not only able to use HF voice, I was hitting FT-8 digital contacts 4000 miles away. It beat the pants off the FT-991A's internal tuner. PROs: This is professionally assembled, easy to use, and compact on my radio table. If you don't need USB-C power, it comes with standard 12v pigtails to attach to a benchtop power supply. It tunes most frequencies from 180m to 70cm below 1.5SWR in a few seconds, and it doesn't appear to sap any signal strength from the original transmitter. This design is available Open Source, but unless you build it yourself, you're not likely to find a cheaper option. It's a good price. Looks great, too. CONs: This kit offers USB-C charging, but there is some soldering involved if you want that. That part is not assembled, and could be intimidating to some. It was for me, so I just wired it into my power supply with the 12v pigtail that came with the kit. The pigtail is short (15-18" or so), and the wires are only stripped about 1/4 inch. It'll be a tight fit for some users. Overall, I recommend this tuner. It's much cheaper than others that perform the same function, and it's easy to use.