Malahit ATU-100 Antenna Tuner Box atu100 Shell ATU100 1.8-50MHz case

I had a sense of trepidation when I bought this case set and the tuner kit: at that price would it really work? Now, months after assembling the tuner and putting it into this case I am delighted. I think this is an excellent tuner for a portable 100 watt or less mobile HF radio. I leave it connected and turned on all the time. I hear it automatically tuning when I change bands for FT8. The display has developed some dim spots, but they're still legible. The case fit perfectly. Only one thing to be aware of and that is to plug in the power plug before turning on or connecting the power supply, otherwise you may burn the fuse.

I ended up having to return mine, but the reason is probably not due to the seller, but Amazon rather. The product itself is solid, with plenty of room to work. Problem is that there was not only a hold in the box it came in, but also the outside packaging, which was just a plastic envelope. There were holes in both, so it's no surprise that pieces were missing. I had the same issue with the actual kit I ordered as they shipped in the same envelope. I tried to assemble supplementing with parts I had on hand, but in the end I just couldn't get it to work without ordering more parts...which would have cost too much and took too long in the end. Wouldn't be so bad, but for some reason, Amazon's logistics are messed up, with stuff taking over a week to ship from the warehouse, where it used to take just a day or two. I don't know what's going on with the company, but it makes me want to order less.

Kit is not for the novice! But, if you have several builds under your belt, that should suffice for this level. Winding inductors/ toroids and soldering experience a must!The review from Scouter III was detailed, informative ans spot on to the issues you may face, and I concur with him 100%. Some parts had no use in this kit, and others parts are not supplied at all. Not the end of the world, just be ready to hit the spare parts drawer to complete the tuner. I did add some FT37-43 toroids and 100 nf caps across the buttons and changed out one of the diodes to a 1n5711 on the swr bridge as per the suggestion by one YouTuber.This is a great tuner for the money if you are willing to do some slight modifications. It's usable without the mods, but much better with them. All in all, it was a fun build which provides you with a nice portable tuner for very little money.

Not only did it arrive late, the nuts and spacers to mount the display are missing. The screws to attach the front and back panels are supposed to be black matching the enclosure and the picture but they are chrome.Only 2 nuts provided where 4 are needed for the PL259.2 solder lugs included for the PL259 but missing for the ground connection.No instruction on how to mount the display and missing spacers, nuts.Otherwise it looks good and nice finish.

Everything fits like it should. Thanks

When I assembled this kit the display wasn't working, the only answer I got from seller or whoever he was was that this is meant for a certain kind of ATU-100. How many versions are there? I ended up paying out of my own pocket for a new display only to find it was upside down. I eventually used double sided tape and silicone sealant to hold it in place. I guess theres more than one version of the display and I couldn't get it from him. Decades of electronics experience made it work.

I FINALLY got my ATU-100 Antenna Tuner kit and this Tuner Box built after watching several YouTube videos done by previous builders. The Tuner works great and this box makes the whole unit look fabulous! However, I had to re-work some wiring errors I made due to the lack of detailed instructions and the fact that I am not an Electronics Assembly Expert.The difficulty is that there are no detailed Step-By-Step Instructions for this kit. There is adequate information on the document along with the Schematic to enable an experienced kit builder to assemble the kit. However, a relatively new or first-time kit builder probably will not be able to get it assembled.Here are a few things I learned (some the hard way!) -Unless you have SUPER eyesight, use a large magnifying glass/light before you attempt to build this kit.1. For the Malahit ATU-100 Antenna Tuner Box, the image of the wiring on the back of the green TuneSwitch is incorrect. The wire connecting half of the Auto, BYP and Tune switches together goes toGROUND, NOT the + wire as shown in the picture that comes with the Tuner Box. The OTHER side ofthe Tune switch gets the + wire.2. The hookup wire necessary to fully assemble the ATU-100 kit does NOT come with the kit! You willhave to provide the stranded insulated hookup wire yourself (NOWHERE is this mentioned on AmazonNOR the single Instruction sheet!).A. I used some 18 ga. stranded insulated wire for the initial power connector but the hole in the PCBmade it tough to fit that size wire in the (-) PCB hole. The other wire (+) goes to the On/Off PowerSwitch so there was no issue there.B. I used 22 ga. stranded insulated hookup wire (very flexible!) for the other hookup wire connectionsthat were necessary.C. The Yellow and White wires needed to connect the Auto and BYP switches to the BACK SIDE of thePrinted Circuit Board (PCB) must be VERY small to fit into the two tiny PCB holes they must besoldered into. You will need to be very careful soldering these two wires to the back of the PCBbecause the solder pads are so small and so close together!3. This is a very compact kit. Use a very small pointed Soldering Iron to prevent overheating the PCB orthe already installed SMD components.4. As another Amazon customer suggested, I recommend building and installing the Toroids FIRST. I alsowould add to build and install them in their numbered order. Trying to install the Toroids AFTER theRelays are soldered onto the PCB will be a nightmare.5. Pay close attention to the size and LENGTH of the wire required for each Toroid as stated on theInstruction sheet.6. As suggested in the instruction sheet, I used Allen Wrenches the described diameter as described towind the three air core windings.7. Take your time and be sure you understand EXACTLY where each component and wire should besoldered to the PCB. I initially soldered the four light yellow enameled wires for the Tandem MatchTransformer "binocular" toroid into the WRONG 4 holes (underneath it!). They actually go into the fourSMALL holes just outside the "binocular" toroid's diagram outline on the PCB.8. The Electrolytic Capacitors have a very distinct mark on one side. Be sure that side of those Capacitorsgoes into the PCB hole that shows the white mark on the edge of the circle images on the PCB.9. Examine the picture of the vertically installed diode as it is shown on the Instruction sheet. Be sure thewhite ring mark is at the TOP when you solder it into the PCB (you will have to bend that end of thediode's terminal wire down toward the other wire end to install it vertically).10. If you buy the Tuner Box, BEFORE YOU SOLDER THE SLIP ON TERMINALS ONTO THE OLED, be sureyou draw yourself a diagram showing which terminal on the OLED display module is which connection(i.e., Gnd, VAC, SCL and SDA). After you solder the slip-on terminals to the OLED display module, youwill no longer be able to read those markings on it!11. If you buy the Tuner Box pay close attention to how the four green mounting tabs are oriented in theInstruction sheet picture when they are attached to the PCB.12. If you buy the Tuner Box, when pushing the On/Off Power Switch into the end panel, do your best tokeep the switch even and press it straight into the rectangle hole (i.e., NOT one side in before theother!).13. If you buy the Tuner Box, I suggest sticking a piece of electrical tape or other insulation material ontothe back side of the front end panel. This tape will insulate the inside of the front box end panel. Thisis BETWEEN where the OLED display's soldered slip-on connectors are located and the inside ofthat box end. This should keep those solder connections from contacting the inside of that metal boxend. The Instruction sheet does not mention this. It just didn't make sense to me to risk those solderconnection points touching the metallic box end panel and potentially shorting out. I actually used asmall file to flatten the sharply pointed solder points to make their thickness narrower and less likelyto punch through the tape and contact the metal end panel.As I said, my completed ATU-100 Tuner and Tuner Box works great (the box looks great too!). However, my language during the build process was not fit for human ears! I hope this was helpful to others considering to buy and build this kit and that they have a much better experience building their kit.73!

Great build quality. Good Price! Came with a spare OLED screen.