{"id":485,"date":"2025-10-28T11:56:51","date_gmt":"2025-10-28T11:56:51","guid":{"rendered":"http:\/\/elerain.com\/?p=485"},"modified":"2026-01-11T21:59:58","modified_gmt":"2026-01-11T12:59:58","slug":"30db-rf-low-noise-amplifier-for-near-field-probes-user-manual","status":"publish","type":"post","link":"https:\/\/elerain.com\/ko\/30db-rf-low-noise-amplifier-for-near-field-probes-user-manual\/","title":{"rendered":"30dB RF Low Noise Amplifier for Near-Field Probes &#8211; User Manual"},"content":{"rendered":"<p><strong>Model:<\/strong> LNA-30<br \/>\n<strong>Version:<\/strong> 1.0 \u2014 October 2025<br \/>\n<strong>Author:<\/strong> Elerain<\/p>\n<div id='gallery-1' class='gallery galleryid-485 gallery-columns-2 gallery-size-full'><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/elerain.com\/wp-content\/uploads\/2025\/10\/\u0418\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0435-WhatsApp-2025-10-23-\u0432-15.01.56_0f1d8c41.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"674\" src=\"https:\/\/elerain.com\/wp-content\/uploads\/2025\/10\/\u0418\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0435-WhatsApp-2025-10-23-\u0432-15.01.56_0f1d8c41.jpg\" class=\"attachment-full size-full\" alt=\"\" srcset=\"https:\/\/elerain.com\/wp-content\/uploads\/2025\/10\/\u0418\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0435-WhatsApp-2025-10-23-\u0432-15.01.56_0f1d8c41.jpg 1280w, https:\/\/elerain.com\/wp-content\/uploads\/2025\/10\/\u0418\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0435-WhatsApp-2025-10-23-\u0432-15.01.56_0f1d8c41-600x316.jpg 600w, https:\/\/elerain.com\/wp-content\/uploads\/2025\/10\/\u0418\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0435-WhatsApp-2025-10-23-\u0432-15.01.56_0f1d8c41-300x158.jpg 300w, https:\/\/elerain.com\/wp-content\/uploads\/2025\/10\/\u0418\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0435-WhatsApp-2025-10-23-\u0432-15.01.56_0f1d8c41-1024x539.jpg 1024w, https:\/\/elerain.com\/wp-content\/uploads\/2025\/10\/\u0418\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0435-WhatsApp-2025-10-23-\u0432-15.01.56_0f1d8c41-768x404.jpg 768w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/elerain.com\/wp-content\/uploads\/2025\/10\/\u0418\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0435-WhatsApp-2025-10-23-\u0432-15.01.56_b9a78edf-e1761652916751.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"674\" src=\"https:\/\/elerain.com\/wp-content\/uploads\/2025\/10\/\u0418\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0435-WhatsApp-2025-10-23-\u0432-15.01.56_b9a78edf-e1761652916751.jpg\" class=\"attachment-full size-full\" alt=\"\" srcset=\"https:\/\/elerain.com\/wp-content\/uploads\/2025\/10\/\u0418\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0435-WhatsApp-2025-10-23-\u0432-15.01.56_b9a78edf-e1761652916751.jpg 1280w, https:\/\/elerain.com\/wp-content\/uploads\/2025\/10\/\u0418\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0435-WhatsApp-2025-10-23-\u0432-15.01.56_b9a78edf-e1761652916751-600x316.jpg 600w, https:\/\/elerain.com\/wp-content\/uploads\/2025\/10\/\u0418\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0435-WhatsApp-2025-10-23-\u0432-15.01.56_b9a78edf-e1761652916751-300x158.jpg 300w, https:\/\/elerain.com\/wp-content\/uploads\/2025\/10\/\u0418\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0435-WhatsApp-2025-10-23-\u0432-15.01.56_b9a78edf-e1761652916751-1024x539.jpg 1024w, https:\/\/elerain.com\/wp-content\/uploads\/2025\/10\/\u0418\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0435-WhatsApp-2025-10-23-\u0432-15.01.56_b9a78edf-e1761652916751-768x404.jpg 768w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/a>\n\t\t\t<\/div><\/figure>\n\t\t<\/div>\n\n<h2>1. Overview<\/h2>\n<p>The LNA-30 is a compact, wide-band low noise amplifier designed for use with EMC near-field probes, EMI diagnostics, and RF measurement systems.<br \/>\nIt provides high gain (30 dB) and low noise figure, ensuring accurate signal capture even from weak electromagnetic emissions.<br \/>\nThe module supports frequencies from 30 MHz to 1 GHz and operates from a +5 V DC power supply via a USB-C connector.<\/p>\n<h2>2. Features<\/h2>\n<p>\u2022 Frequency range: 30 MHz \u2013 1000 MHz<br \/>\n\u2022 Typical gain: +30 dB<br \/>\n\u2022 Noise figure: &lt; 2 dB (typ.)<br \/>\n\u2022 Power supply: +5 V DC, &lt; 100 mA<br \/>\n\u2022 RF connectors: SMA female (50 \u03a9)<br \/>\n\u2022 Compact PCB: 51 mm \u00d7 26 mm (typ.)<br \/>\n\u2022 Designed for EMC near-field probes or antenna pre-amplification<\/p>\n<h2>3. Applications<\/h2>\n<p>\u2022 EMC \/ EMI debugging of electronic circuits<br \/>\n\u2022 Signal amplification for near-field magnetic and electric probes<br \/>\n\u2022 Pre-amplifier for spectrum analyzers or SDR receivers<br \/>\n\u2022 RF measurement in low-signal environments<\/p>\n<h2>4. Electrical Specifications<\/h2>\n<table style=\"height: 554px;\" width=\"578\">\n<thead>\n<tr>\n<td>\n<p style=\"text-align: center;\"><strong>Parameter<\/strong><\/p>\n<\/td>\n<td style=\"text-align: center;\"><strong>Min<\/strong><\/td>\n<td style=\"text-align: center;\"><strong>Typ<\/strong><\/td>\n<td style=\"text-align: center;\"><strong>Max<\/strong><\/td>\n<td>\n<p style=\"text-align: center;\"><strong>Unit<\/strong><\/p>\n<\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Supply Voltage<\/td>\n<td>\n<p style=\"text-align: center;\">4.8<\/p>\n<\/td>\n<td style=\"text-align: center;\">5.0<\/td>\n<td style=\"text-align: center;\">5.5<\/td>\n<td>\n<p style=\"text-align: center;\">V<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>Supply Current<\/td>\n<td>\n<p style=\"text-align: center;\">\u2013<\/p>\n<\/td>\n<td style=\"text-align: center;\">30<\/td>\n<td style=\"text-align: center;\">100<\/td>\n<td>\n<p style=\"text-align: center;\">mA<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>Frequency Range<\/td>\n<td>\n<p style=\"text-align: center;\">30<\/p>\n<\/td>\n<td style=\"text-align: center;\">\u2013<\/td>\n<td style=\"text-align: center;\">1000<\/td>\n<td>\n<p style=\"text-align: center;\">MHz<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>Gain<\/td>\n<td>\n<p style=\"text-align: center;\">28<\/p>\n<\/td>\n<td style=\"text-align: center;\">30<\/td>\n<td style=\"text-align: center;\">32<\/td>\n<td>\n<p style=\"text-align: center;\">dB<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>Input\/Output Impedance<\/td>\n<td>\n<p style=\"text-align: center;\">\u2013<\/p>\n<\/td>\n<td style=\"text-align: center;\">50<\/td>\n<td style=\"text-align: center;\">\u2013<\/td>\n<td>\n<p style=\"text-align: center;\">\u03a9<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>Noise Figure<\/td>\n<td>\n<p style=\"text-align: center;\">\u2013<\/p>\n<\/td>\n<td style=\"text-align: center;\">2.0<\/td>\n<td style=\"text-align: center;\">2.5<\/td>\n<td>\n<p style=\"text-align: center;\">dB<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>Max Input Power<\/td>\n<td>\n<p style=\"text-align: center;\">\u2013<\/p>\n<\/td>\n<td style=\"text-align: center;\">\u2013<\/td>\n<td style=\"text-align: center;\">\u201325<\/td>\n<td>\n<p style=\"text-align: center;\">dBm<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>Max Output Power (1 dB comp.)<\/td>\n<td>\n<p style=\"text-align: center;\">\u2013<\/p>\n<\/td>\n<td style=\"text-align: center;\">\u2013<\/td>\n<td style=\"text-align: center;\">+5<\/td>\n<td>\n<p style=\"text-align: center;\">dBm<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>6. Connections and Setup<\/h2>\n<h3>Step 1 \u2013 RF Connections<\/h3>\n<p>\u2022 Connect your near-field probe to the IN (left SMA) port.<br \/>\n\u2022 Connect the OUT (right SMA) port to your spectrum analyzer, oscilloscope, or receiver using a 50 \u03a9 coaxial cable.<br \/>\n\u2022 Observe correct signal flow direction (\u2192 arrows on PCB).<\/p>\n<h3>Step 2 \u2013 Power<\/h3>\n<p>\u2022 Connect a standard USB-C cable with +5 Vdc power source to the PWR port.<br \/>\n\u2022 Ensure the source can supply +5 V \/ 100 mA (typical).<br \/>\n\u2022 The module draws less than 100 mA at full gain.<\/p>\n<h2>7. Usage Notes<\/h2>\n<p>\u2022 Always terminate the output with 50 \u03a9.<br \/>\n\u2022 Keep cables reasonably short to minimize losses.<br \/>\n\u2022 For high-frequency measurements (&gt; 500 MHz), use quality low-loss coax.<br \/>\n\u2022 Avoid applying DC or strong RF power to the input.<br \/>\n\u2022 Do not exceed +5.5 V on the power input.<\/p>\n<h2>8. Maintenance &amp; Handling<\/h2>\n<p>\u2022 Handle the PCB by edges to prevent ESD damage.<br \/>\n\u2022 Keep connectors clean and dust-free.<br \/>\n\u2022 Store at room temperature and low humidity.<\/p>\n<h2>9. Safety Information<\/h2>\n<p>\u2022 The LNA-30 is a low-voltage device and poses minimal electrical hazard.<br \/>\n\u2022 Do not connect directly to transmitters or high-power RF sources.<br \/>\n\u2022 Use only with passive near-field probes or measurement instruments.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Model: LNA-30 Version: 1.0 \u2014 October 2025 Author: Elerain 1. Overview The LNA-30 is a compact, wide-band low noise amplifier designed for use with EMC near-field probes, EMI diagnostics, and RF measurement systems. It provides high gain (30 dB) and low noise figure, ensuring accurate signal capture even from weak electromagnetic emissions. The module supports&#8230;<\/p>\n","protected":false},"author":2,"featured_media":489,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[33],"tags":[22],"class_list":["post-485","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-products","tag-english"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.0 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>30dB RF Low Noise Amplifier for Near-Field Probes - User Manual<\/title>\n<meta name=\"description\" content=\"Model: LNA-30 Version: 1.0 \u2014 October 2025 Author: Elerain 1. 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