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About the firmware：ATU-100 Latest 3.2 version has flashed
[ATU-100 Version] 3.2 version.Compared with version 3.1, some bugs have been fixed.
-SWR greater than 1.1 will automatically activate tuning,and the minimum power has been changed from 5W to 1W. 3.2 version can be tuned below 5W.However, Too low value may result in insufficiently fine tuning(original default is greater than 5W auto tuning) , please know this before placing an order.
[Product Features]Automatic Antenna Tuner machine with Shell（No battery）,No need to assemble,can use it directly,Automatically tuned developed by N7DDC.
[High-quality Accessories] High-quality SMD capacitors, C-channel capacitors, high-quality 1000V high-voltage SMD capacitors, and the PIC chip imported. UHF connector.
NOTE：The EXT word has now been removed from the panel
Product highlights and features:
CNC perforated aluminum alloy, the entire shell is made of aluminum alloy,NOT PCB.
Parameter Description and inside structure:
-Power supply range: 10-15 VDC
-Max current: 450mA
-Max working power: 100 watts
-Max measured power: 150 watts
-Minimum power for tuning start: 1 watt
-Recommended maximum power while tuning not above 30watts. (after tuningyou can set 100 watts and work on this power)
-Minimum measured power: 0.1 watt
-Step for measurement on powers under 10 watts: 0.1 watt
-Step for measurement on powers above 10 watts: 1 watt
-Power measurement accuracy: 10%
-Maximum inductance set: 8.5 uH
-Minimal step for setting inductance: 0.1 uH
-Maximum installed capacity: 1870 pF
-Minimal step for setting capacity: 10 pF
ATU-100 size description：
[Remarkably Compact] The shell of the machine is designed by an excellent designer, compact and exquisite.
Weight:550g
SIZE: 140 x 88 x 38 mm (L*W*H)
Front panel and back panel: All aluminum alloy material
(they have replaced the previous PCB material, more texture).
Package List:
-1 x Assembled Automatic Antenna Tuner machine with Shell（No battery）
-DC5.5 x 2.1 power cord*1
-USB 5V to 9V Booster board *1
ATU-100 mode description and Instructions（NOTE：The EXT word has now been removed from the panel）
1. Automatic Mode
0.00_ When a dot "." appears, it means automatic mode
2.BYP Mode
0.00_ When "-" appears, it means BYP mode
0.00 When the dot and-disappear, it means manual mode
3.Test Mode
Press the BYP and AUTO buttons at the same time, then turn on the power to enter the test mode.
4.Fast Test
Press the TUNE, BYP and AUTO at the same time, then turn on the power to enter the fast test mode.
ATU-100 Antenna Tuner Scene:
ATU-100 connects to the device：
Good condition.
ATU-100 Test：
Successful completion of the test: connected to the device.
ATU-100 Effect：
Connects to the device perfect.
ATU-100 SWR：
Work normally.
J. D.
2025-08-01 14:39:16
After watching reputable YouTuber's like smokin ape, etc. I was hesitant to buy this. But given there are several sources and most reviews are a year plus old I thought if there were faulty solder connections and shoddy build quality, I'd try to go over them rather than assemble a kit. I was very surprised this unit was excellent build quality and works perfectly. I may still swap the 2 SM diodes with 1N5711's if I note any future issues, but for now this vendors product works fine.
CLF
2025-06-15 16:13:19
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.
Willie
2025-06-03 11:45:10
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 cablethe good:solid constructionno internal battery (i consider this a plus)no rattlesunit powered upunit functions properlyfirmware provides SWR, impedance info, and FWD powerbuttons respond to pressesmost important: firmware is the latest 3.2 versioneven more important for QRP ops: the PIC firmware has been modified to initiate tuning at 1W power levelsthe 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 dropsno rubber feet or flip-up front feetuse of UHF connectors (most ops nowadays prefer BNC) as this is touted as a compact unit for /P operationinteresting note: i did find the unit to work with a single fresh 9V alkaline batterythis 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 requirementsi 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 dipolesi like this tuner - it is smaller than my previously favorite QRP tuner, the legendary LDG Z11
Robert Decker
2025-05-26 13:09:26
Using it on an EFHW antenna. Able to work 6m thru 160m. No complimts.
Jeff
2025-04-27 12:12:35
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.
Rob Park
2025-03-04 16:23:22
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 55MHZ2. Needs only ~1w to initiate tune up. (Tune progressively in watts as you increase).3. Works also at 100w4. Low current draw5. Tunes quickly6. 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.
jean
2025-02-05 11:06:47
I had been looking to build or buy a small tuner for use on camping trips with my sBitx transceiver. (I tried a different brand of tuner with less features first, but it didn't work at all.) Right from the box this worked perfectly. The quality of construction seems very good, although I have not opened it to examine the board yet.It can match an 80 meter inverted vee to any band 80 through 10. I also tried matching various frequencies to a 20 meter quad element. In short, so far, I am pleased with this product. It will do well with a small portable antenna and be easy to transport.
Dave King
2025-01-19 12:21:55
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.
Wilfried Schneider
2024-12-29 12:14:47
sehr gute Ware
Michael
2024-12-24 11:50:50
Way better than expected awesome little tuner.
Lyle M
2024-12-14 18:19:34
Great little antenna tuner. Works fast and quiet. Does not come with USB cable but with power cable. Read the instructions before you buy.
jim
2024-12-03 13:37:27
the antenna tuner is used on my hf ham radio it works very well good item it tunes very well jim
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