{"product_id":"rm-italy-kl503hd-linear-amplifier","title":"RM Italy KL503HD 300W Linear Amplifier with Receive Preamp","description":"\u003cp\u003eThe RM Italy KL503HD is a 300W maximum-output linear amplifier with a\nsix-position rotary power control and a switchable receive preamplifier.\nIt accepts 1–35W input across its supported modes.\u003c\/p\u003e\n\u003ch2 id=\"key-features\"\u003eKey features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum output:\u003c\/strong\u003e Manufacturer-rated 300W.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput range:\u003c\/strong\u003e 1–35W across supported AM, FM, SSB and\nCW modes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput control:\u003c\/strong\u003e Six-position rotary selector.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReceive preamplifier:\u003c\/strong\u003e Switchable from the front\npanel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDC supply:\u003c\/strong\u003e 13.8V nominal with a 40A supply\nrating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCooling:\u003c\/strong\u003e Heatsink housing with space required for\nventilation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize and weight:\u003c\/strong\u003e Approximately 11.81 inches long ×\n7.48 inches wide × 2.64 inches high; approximately 4.52 lb.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 id=\"specifications\"\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eManufacturer rating\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eRM Italy KL503HD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency range\u003c\/td\u003e\n\u003ctd\u003e25–30 MHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModes\u003c\/td\u003e\n\u003ctd\u003eAM, FM, SSB and CW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum output\u003c\/td\u003e\n\u003ctd\u003e300W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput power\u003c\/td\u003e\n\u003ctd\u003e1–35W, all modes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply voltage\u003c\/td\u003e\n\u003ctd\u003e13.8V DC ±1V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower-supply rating\u003c\/td\u003e\n\u003ctd\u003e40A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum current draw\u003c\/td\u003e\n\u003ctd\u003e30A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput control\u003c\/td\u003e\n\u003ctd\u003eSix-position rotary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReceive preamplifier\u003c\/td\u003e\n\u003ctd\u003eSwitchable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput VSWR\u003c\/td\u003e\n\u003ctd\u003e1.1–1.5:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuses\u003c\/td\u003e\n\u003ctd\u003eThree 10A fast-blow fuses\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eApproximately 11.81 inches long × 7.48 inches wide × 2.64 inches\nhigh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUnit weight\u003c\/td\u003e\n\u003ctd\u003eApproximately 4.52 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2 id=\"setup-requirements\"\u003eSetup requirements\u003c\/h2\u003e\n\u003cp\u003eCheck the driving radio's RF output before switching on the\namplifier. Never exceed the 35W input limit, and do not use the\namplifier's output selector as a substitute for reducing excessive drive\nat the radio.\u003c\/p\u003e\n\u003cp\u003eUse a suitable DC supply and correctly rated wiring. Allow clear\nairflow around the heatsink, and connect a properly matched antenna\nsystem or suitable dummy load before transmitting. The antenna, coax and\ntest equipment must be suitable for the operating power and\nfrequency.\u003c\/p\u003e\n\u003cp\u003eThe manufacturer specifies a maximum bypass power of 50W with the\namplifier switched off. Avoid prolonged high-duty-cycle transmission and\nallow the heatsink to cool as needed.\u003c\/p\u003e\n\u003ch2 id=\"us-operating-restriction\"\u003eUS operating restriction\u003c\/h2\u003e\n\u003cp\u003eExternal RF power amplifiers must not be used to increase the\ntransmitting power of a US CB Radio Service station. This amplifier is\nnot a legal CB power upgrade. Observe all applicable\nequipment-authorization and operating requirements.\u003c\/p\u003e\n\u003ch2 id=\"frequently-asked-questions\"\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3 id=\"is-the-kl503hd-a-radio\"\u003eIs the KL503HD a radio?\u003c\/h3\u003e\n\u003cp\u003eNo. The KL503HD is an external linear RF amplifier that works with a\nseparate transceiver. It is not a standalone radio.\u003c\/p\u003e\n\u003ch3 id=\"how-much-input-power-can-the-kl503hd-accept\"\u003eHow much input\npower can the KL503HD accept?\u003c\/h3\u003e\n\u003cp\u003eRM Italy specifies 1–35W input in all supported modes. Do not exceed\n35W. Reduce the driving radio's output rather than relying on the\namplifier's power selector to make excessive input safe.\u003c\/p\u003e\n\u003ch3 id=\"what-output-power-does-rm-italy-specify\"\u003eWhat output power does\nRM Italy specify?\u003c\/h3\u003e\n\u003cp\u003eThe manufacturer specifies 300W maximum output. This is the\namplifier's maximum rating, not its required operating level.\u003c\/p\u003e\n\u003ch3 id=\"what-power-supply-is-required\"\u003eWhat power supply is\nrequired?\u003c\/h3\u003e\n\u003cp\u003eUse a 13.8V DC supply rated for at least 40A. RM Italy lists maximum\namplifier current draw of 30A; supply capacity and maximum amplifier\ndraw are separate specifications.\u003c\/p\u003e\n\u003ch3 id=\"does-it-have-adjustable-output-power\"\u003eDoes it have adjustable\noutput power?\u003c\/h3\u003e\n\u003cp\u003eYes. The KL503HD has a six-position rotary output selector on the\nfront panel.\u003c\/p\u003e\n\u003ch3 id=\"does-it-have-a-receive-preamplifier\"\u003eDoes it have a receive\npreamplifier?\u003c\/h3\u003e\n\u003cp\u003eYes. A front-panel control switches the receive preamplifier on or\noff.\u003c\/p\u003e\n\u003ch3 id=\"how-large-is-the-kl503hd\"\u003eHow large is the KL503HD?\u003c\/h3\u003e\n\u003cp\u003eConverted from the manufacturer's specifications, the unit is\napproximately 11.81 inches long × 7.48 inches wide × 2.64 inches high\nand weighs approximately 4.52 lb.\u003c\/p\u003e\n\u003ch3 id=\"can-i-use-it-to-increase-cb-transmitting-power-in-the-united-states\"\u003eCan\nI use it to increase CB transmitting power in the United States?\u003c\/h3\u003e\n\u003cp\u003eNo. US CB Radio Service rules prohibit using an external RF power\namplifier to increase a CB station’s transmitting power.\u003c\/p\u003e\n\u003cp id=\"rm-italy-operating-notice\" style=\"color: #c00000;\"\u003e*These units are for industrial, scientific, medical, or export use only. It is a violation of US FCC regulations to operate these units on the Citizens Band or Amateur Radio Services in the United States. Please check regulations in your country before operating these unit.\u003c\/p\u003e","brand":"RM Italy","offers":[{"title":"Default Title","offer_id":67935292358973,"sku":"KL503HD","price":338.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0003\/0674\/1262\/files\/rm-italy-kl503hd-300w-linear-amplifier-with-receive-preamp-2570585.png?v=1793960533","url":"https:\/\/cbradiosupply.com\/products\/rm-italy-kl503hd-linear-amplifier","provider":"CB Radio Supply","version":"1.0","type":"link"}