{"product_id":"sf401-plus-27mhz-3000mhz-radio-portable-frequency-counter-meter","title":"SF401 Plus 27MHz-3000MHz Radio Portable Frequency Counter Meter","description":"\u003cp\u003eOur review of the SF401 Plus finds it to be a compact, practical frequency counter aimed at radio hobbyists, field technicians and anyone who needs a quick read on continuous carrier signals. The single biggest reason to buy is its broad \u003cstrong\u003e27MHz-3000MHz\u003c\/strong\u003e coverage combined with built-in CTCSS\/DCS decoding, which lets the user identify tone information and measure signal frequency and strength in one small package. It is most useful when testing two-way radios and sniffing unknown tones on the go, and the rechargeable battery makes it easy to use away from a bench.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide frequency range:\u003c\/strong\u003e The 27MHz to 3000MHz span covers most handheld and mobile two-way radios you will encounter, reducing the need for multiple instruments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCTCSS\/DCS decoder:\u003c\/strong\u003e Built-in tone decoding helps identify continuous tone squelch and digital codes so you can verify channel access tones quickly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal strength indicator:\u003c\/strong\u003e The meter shows signal level so users can assess receive conditions and antenna coupling while measuring frequency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact, battery powered:\u003c\/strong\u003e A built-in Li-ion battery and small 113g form factor let technicians carry the counter in a pocket for field troubleshooting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTCXO stability:\u003c\/strong\u003e Temperature compensated crystal oscillator provides stable frequency accuracy across a wide temperature range, improving measurement reliability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimple controls:\u003c\/strong\u003e Four-button operation and auto power off make routine checks fast and keep power use low between measurements.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe SF401 Plus is best for radio enthusiasts, amateur radio operators and field service techs who need a handheld tool to verify carrier frequency, check signal strength and decode CTCSS\/DCS tones. Its small size and rechargeable battery suit mobile use and quick site checks rather than continuous lab testing.\u003c\/p\u003e\n\u003cp\u003eThose who need lab-grade traceable calibration or integrated spectrum analysis functions should look elsewhere; the SF401 Plus is optimized for practical, in-field measurements and tone identification rather than exhaustive bench diagnostics.\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\u003eBroad frequency coverage with reliable \u003cstrong\u003eCTCSS\/DCS decoding\u003c\/strong\u003e for tone identification.\u003c\/li\u003e\n\u003cli\u003eCompact, lightweight design with a built-in Li-ion battery for portable use.\u003c\/li\u003e\n\u003cli\u003eGood stability from the \u003cstrong\u003eTCXO\u003c\/strong\u003e, helping maintain accuracy across temperatures.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eInterface and four-button control receive mixed feedback on ease of use from some customers.\u003c\/li\u003e\n\u003cli\u003eTone readouts and accuracy can feel inconsistent to users comparing to higher-end lab instruments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency range\u003c\/td\u003e\n\u003ctd\u003e27MHz - 3000MHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCTCSS\/DCS\u003c\/td\u003e\n\u003ctd\u003eBuilt-in decoder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisplay\u003c\/td\u003e\n\u003ctd\u003eColor LCD with dim level setting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOscillator\u003c\/td\u003e\n\u003ctd\u003eTCXO, 2 - 2.5ppm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResponse time\u003c\/td\u003e\n\u003ctd\u003e0.2s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower\u003c\/td\u003e\n\u003ctd\u003eBuilt-in Li-ion battery, USB charging\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight\u003c\/td\u003e\n\u003ctd\u003e113g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe SF401 Plus is a pragmatic pocket frequency counter for anyone working with two-way radios who needs wide coverage plus tone decoding in a portable package. It offers strong value for in-field troubleshooting thanks to \u003cstrong\u003ebroad frequency coverage\u003c\/strong\u003e, TCXO stability and a rechargeable battery, though those needing lab-level precision or a more intuitive menu layout should consider higher-end instruments.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this unit decode CTCSS and DCS tones?\u003c\/strong\u003e\u003cbr\u003eYes. The SF401 Plus includes a built-in CTCSS and DCS decoder to identify tone and digital squelch codes on continuous carrier signals.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow accurate is the frequency measurement?\u003c\/strong\u003e\u003cbr\u003eThe meter uses a TCXO with about 2 to 2.5ppm stability across temperature, providing reliable field accuracy for most two-way radio checks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is included in the package?\u003c\/strong\u003e\u003cbr\u003eThe unit ships with the SF401 Plus frequency counter, a UHF antenna, user manual, USB charging cable and USB AC adapter.\u003c\/p\u003e","brand":"Surecom","offers":[{"title":"Default Title","offer_id":48746275668187,"sku":"B01NA0957P","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51M97jsm2KL._AC.jpg?v=1778964435","url":"https:\/\/gearmusthave.com\/products\/sf401-plus-27mhz-3000mhz-radio-portable-frequency-counter-meter","provider":"GearMustHave","version":"1.0","type":"link"}