{"product_id":"inmarsat-l-band-uplink-bandpass-filter-1626-5-to-1660-5-mhz","title":"Inmarsat L-Band Uplink Bandpass Filter (1626.5–1660.5 MHz)","description":"\u003ch2\u003e\u003cstrong\u003ePRODUCT OVERVIEW\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eInmarsat's L-band mobile satellite service relies on two distinct frequency ranges: downlink from the satellite to terminals runs from 1525 to 1559 MHz, while the uplink from terminals back to the satellite runs from 1626.5 to 1660.5 MHz.\u003c\/p\u003e\n\u003cp\u003eThis filter covers that uplink window precisely, centered at 1643.5 MHz with a 34 MHz passband, with less than 5 dB of insertion loss across the full band.\u003c\/p\u003e\n\u003cp\u003eThe 1626.5 to 1660.5 MHz uplink is the transmit path for a wide range of Inmarsat services: Fleet Broadband and IsatPhone terminals in maritime and land-mobile deployments, Inmarsat-C messaging used for Global Maritime Distress and Safety System (GMDSS) compliance, and aeronautical data links carrying ACARS and ADS-C traffic between aircraft and ground stations.\u003c\/p\u003e\n\u003cp\u003eA filter placed ahead of a receiver monitoring this band rejects strong out-of-band signals from adjacent GNSS downlinks (GPS L1 at 1575.42 MHz sits just 51 MHz below the lower band edge), cellular infrastructure, and other L-band services that would otherwise compete for the receiver's dynamic range.\u003c\/p\u003e\n\u003cp\u003eOperating range is -40°C to +85°C, maximum RF input is +10 dBm, and the filter is passive and draws no power.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eAPPLICATIONS\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSpectrum monitoring and analysis of Inmarsat mobile satellite uplink traffic\u003c\/li\u003e\n\u003cli\u003eInmarsat terminal test and development bench setups requiring clean frequency isolation\u003c\/li\u003e\n\u003cli\u003eMaritime and GMDSS receive system front ends\u003c\/li\u003e\n\u003cli\u003eAeronautical satellite communications monitoring (ACARS, ADS-C via Inmarsat Aero)\u003c\/li\u003e\n\u003cli\u003eFleet management and tracking terminal development (Fleet Broadband, IsatPhone)\u003c\/li\u003e\n\u003cli\u003eSDR-based L-band satellite reception requiring interference rejection from adjacent bands\u003c\/li\u003e\n\u003cli\u003eDefence and SIGINT receive chains targeting the 1626.5–1660.5 MHz mobile satellite service allocation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eFILTER PERFORMANCE\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency Range\u003c\/th\u003e\n\u003cth\u003eTypical Attenuation\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e50–550 MHz\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;60 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e550–900 MHz\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;55 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e900–1590 MHz\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;40 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e1626.5–1660.5 MHz (passband)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u0026lt;5 dB insertion loss\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1750–3000 MHz\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;30 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe rejection above 1590 MHz rising sharply to the passband ensures GPS L1 (1575.42 MHz) and other GNSS downlink energy is substantially attenuated before it reaches your receiver, which is the most common source of front-end overload in this frequency region.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eNOTES\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSMA-F PCB edge mount connectors\u003c\/li\u003e\n\u003cli\u003eMaximum RF input: +10 dBm\u003c\/li\u003e\n\u003cli\u003eMaximum DC voltage on input\/output port: 3 VDC\u003c\/li\u003e\n\u003cli\u003ePassive, no power required\u003c\/li\u003e\n\u003cli\u003eFor receive applications, place an LNA ahead of this filter to establish your system noise figure before the filter's insertion loss. See our \u003ca href=\"https:\/\/gpio.com\/collections\/low-noise-amplifiers\"\u003ewideband L-band Low Noise Amplifiers\u003c\/a\u003e for compatible front-end options.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCOMPANION PRODUCTS\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eIf you are building a full Inmarsat L-band receive chain, both sides of the link are now covered:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis filter\u003c\/strong\u003e covers the Inmarsat uplink\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDownlink companion\u003c\/strong\u003e covers the Inmarsat receive path: \u003ca href=\"https:\/\/gpio.com\/collections\/filters\/products\/1525-to-1559-mhz-bandpass-filter-1542-mhz-filter-l-band-inmarsat-bandpass-filter\"\u003e1525–1559 MHz Bandpass Filter for Inmarsat\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"GPIO LABS","offers":[{"title":"Default Title","offer_id":71800892588054,"sku":null,"price":75.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1963\/0387\/files\/1650MHz-0.jpg?v=1752855206","url":"https:\/\/gpio.com\/products\/inmarsat-l-band-uplink-bandpass-filter-1626-5-to-1660-5-mhz","provider":"GPIO LABS","version":"1.0","type":"link"}