{"product_id":"atu-100-ext-antenna-tuner-for-ham-radio-compact-1-8-55mhz-tuner","title":"ATU-100 EXT Antenna Tuner for Ham Radio - Compact 1.8-55MHz Tuner","description":"\u003cp\u003eOur review of the ATU-100 EXT Antenna Tuner finds it best suited to HF enthusiasts who need a portable, no-assembly tuner that handles a wide range of amateur bands. The single biggest reason to consider this unit is its combination of automatic\/manual tuning and broad coverage from 1.8 to 50MHz, which delivers reliable impedance matching for QRP operations and field use. It is especially appealing to operators using end-fed wires and lightweight stations who want a straightforward, rugged tuner with a clear OLED readout.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLatest Version:\u003c\/strong\u003e Version 3.2 fixes prior firmware issues, improving tuning consistency compared with earlier releases.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Frequency Range:\u003c\/strong\u003e Covers the amateur bands from 1.8MHz up to 50MHz, providing flexible matching for most HF and low-VHF use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic and Manual Tuning:\u003c\/strong\u003e Offers both automatic tuning for convenience and manual control for operators who prefer fine adjustments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePortable Design:\u003c\/strong\u003e The compact unit includes a 0.91-in OLED screen for clear readout in the field while remaining small enough for portable setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobust Construction:\u003c\/strong\u003e A premium metal casing provides protection and stable performance for regular outdoor or mobile operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeven-Ladder L\/C Network:\u003c\/strong\u003e Seven inductors and seven capacitors allow broad impedance matching with low standing wave ratio across most antennas.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe ATU-100 EXT is ideal for ham radio operators running QRP or low-power radios who need a compact tuner that can be used right out of the box. It suits portable operators, field-day participants, and those using EFHW or other wire antennas who want a reliable automatic tune plus the option to fine-tune manually.\u003c\/p\u003e\n\u003cp\u003eOperators who regularly run high power or require guaranteed tuning at the top of 50MHz with extreme mismatches should look elsewhere; the tuner performs best between 1.8 and 30MHz and is recommended to be used with radio output around 6-12W during tuning for best results.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCompact, portable design with a clear 0.91-in OLED display makes field use simple.\u003c\/li\u003e\n\u003cli\u003eEffective automatic tuning delivers low SWR across many antenna types including EFHWs.\u003c\/li\u003e\n\u003cli\u003eDurable metal case and a seven-element L\/C network provide stable, reliable performance.\u003c\/li\u003e\n\u003cli\u003eNo assembly required and supports manual tuning for experienced users.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTuning success narrows above 30MHz and extreme antenna SWR may not be reducible below 1.5.\u003c\/li\u003e\n\u003cli\u003eDoes not include a direct power cord in all packages, so a compatible 13.8V supply may be needed separately.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eATU-100 EXT (version 3.2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency range\u003c\/td\u003e\n\u003ctd\u003e1.8MHz - 50MHz (optimal 1.8-30MHz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower handling\u003c\/td\u003e\n\u003ctd\u003eDesigned for QRP, recommended tuning power 6-12W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNetwork\u003c\/td\u003e\n\u003ctd\u003e7 inductors and 7 capacitors L\/C network\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisplay\u003c\/td\u003e\n\u003ctd\u003e0.91-in OLED, 128x32 pixels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCase\u003c\/td\u003e\n\u003ctd\u003ePremium metal casing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower input\u003c\/td\u003e\n\u003ctd\u003eConnects to radio at 13.8V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe ATU-100 EXT is a strong value for hams who need a portable, no-assembly antenna tuner with both automatic and manual options. Its broad band coverage, robust metal case, and clear OLED readout make it a practical choice for QRP and portable operations, though those needing high-power matching or guaranteed tuning at higher VHF frequencies should consider other solutions.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCan this tuner be used without assembly?\u003c\/strong\u003e\u003cbr\u003eYes. The unit is ready to use out of the box and supports both automatic and manual tuning modes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat power should be used during tuning?\u003c\/strong\u003e\u003cbr\u003eIt is recommended to keep radio output around 6-12W while the tuner is operating to assist the tuning process.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it tune all bands up to 50MHz?\u003c\/strong\u003e\u003cbr\u003eIt can operate at 50MHz but its optimal tuning range is 1.8-30MHz; tuning range narrows as frequency increases and very high SWR loads may not tune below 1.5.\u003c\/p\u003e","brand":"GOOZEEZOO","offers":[{"title":"Default Title","offer_id":48187952333019,"sku":"B0BX8Z2628","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61CNJTDwl3L._AC_SL1500.jpg?v=1769518475","url":"https:\/\/gearmusthave.com\/products\/atu-100-ext-antenna-tuner-for-ham-radio-compact-1-8-55mhz-tuner","provider":"GearMustHave","version":"1.0","type":"link"}