{"id":207,"date":"2026-07-02T02:56:59","date_gmt":"2026-07-02T02:56:59","guid":{"rendered":"https:\/\/blogs.lcsccable.com\/blog\/?p=207"},"modified":"2026-07-02T02:56:59","modified_gmt":"2026-07-02T02:56:59","slug":"coaxial-cable-selection-by-application","status":"publish","type":"post","link":"https:\/\/blogs.lcsccable.com\/blog\/coaxial-cable-selection-by-application\/","title":{"rendered":"Coaxial Cable Selection by Application"},"content":{"rendered":"<h2><b><span data-font-family=\"Arial\">Key Takeaways<\/span><\/b><\/h2>\n<ul>\n<li><b><span data-font-family=\"Arial\">3 dB\/m threshold: <\/span><\/b><span data-font-family=\"Arial\">When cable loss exceeds 3 dB\/m at the operating frequency, switch to a lower-loss type \u2014 no downstream amplifier recovers the noise figure lost in the feed cable.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">50 \u03a9 vs 75 \u03a9 is non-negotiable: <\/span><\/b><span data-font-family=\"Arial\">A 50 \u03a9 \/ 75 \u03a9 mismatch produces a 14 dB return loss and degrades receiver noise figure by up to 1 dB \u2014 never mix impedance standards in an RF chain.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Velocity factor governs electrical length: <\/span><\/b><span data-font-family=\"Arial\">Solid-PE cable (VF = 0.66) is electrically 52 % longer than its physical length; always divide target wavelength by VF before cutting quarter-wave stubs or delay lines.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Double-braid above 1 GHz: <\/span><\/b><span data-font-family=\"Arial\">Single braid delivers ~55 dB shielding; foil-plus-braid reaches 90 dB or more, the minimum for CISPR 25 Class 5 automotive compliance.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">What Is a Coaxial Cable?<\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">A coaxial <a href=\"https:\/\/blogs.lcsc.com\/blog\/telecommunication-cable-guide\/\">cable<\/a> is a high-frequency transmission line featuring a central conductor and one or more concentric outer shields. Sharing a common geometric axis, these layers allow the cable to carry signals with controlled impedance and minimal radiation loss.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Internal Construction and Materials<\/span><\/b><\/h3>\n<ul>\n<li><span data-font-family=\"Arial\">Center Conductor: Bare copper, silver-plated copper, or copper-clad steel (CCS) for high tensile strength.<\/span><\/li>\n<li><span data-font-family=\"Arial\">Dielectric: Materials like Solid PE, Foamed PE (lower loss), or PTFE (high-temp) govern the Velocity Factor (VF) and signal attenuation.<\/span><\/li>\n<li><span data-font-family=\"Arial\">Shielding &amp; Jacket: Braided copper or aluminum foil layers provide protection, finished with a PVC, PE, or LSZH jacket.<\/span><\/li>\n<\/ul>\n<h3><b><span data-font-family=\"Arial\">Why Coaxial Cable Is Indispensable for Engineers<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Coaxial cable\u2019s self-shielding geometry suppresses EMI and external interference, outperforming unshielded twisted pairs above 100 MHz. It is the primary interconnect for antenna feed lines, CATV, vehicular RF, and instrumentation operating up to 18 GHz.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">What Are the Key Features and Advantages of Coaxial Cable?<\/span><\/b><\/h2>\n<table style=\"height: 340px;\" width=\"1004\">\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"173.33333333333334\"><b><span data-font-family=\"Arial\">Feature<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"226.66666666666666\"><b><span data-font-family=\"Arial\">Description<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"224\"><b><span data-font-family=\"Arial\">Engineering Benefit<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"173.33333333333334\"><span data-font-family=\"Arial\">Controlled characteristic impedance<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"226.66666666666666\"><span data-font-family=\"Arial\">Impedance set by conductor diameter ratio and dielectric constant: Z0 = (138 \/ sqrt(Er)) x log10(D\/d), standardised at 50 \u03a9 or 75 \u03a9<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"224\"><span data-font-family=\"Arial\">Eliminates reflections and standing waves when matched to source and load; critical for flat frequency response across multi-octave RF links<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"173.33333333333334\"><span data-font-family=\"Arial\">Low attenuation vs. frequency<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"226.66666666666666\"><span data-font-family=\"Arial\">Attenuation rises with sqrt(f) due to skin effect; RG-58 loses 0.66 dB\/m at 100 MHz, LMR-400 loses 0.22 dB\/m at the same frequency<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"224\"><span data-font-family=\"Arial\">Lower cable loss directly extends wireless link range and reduces required transmit power, shrinking PA heat sink size and supply current<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"173.33333333333334\"><span data-font-family=\"Arial\">High shielding effectiveness<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"226.66666666666666\"><span data-font-family=\"Arial\">Foil-plus-braid shields achieve 90\u2013100 dB isolation from 10 MHz to 3 GHz; measured per IEEE 1560 or IEC 62153-4-3<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"224\"><span data-font-family=\"Arial\">Meets CISPR 25 Class 5 automotive RF immunity and FCC Part 15 emission limits without additional EMI filtering in the RF signal path<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b><span data-font-family=\"Arial\">Why Attenuation Coefficient Drives Cable Selection More Than Impedance<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Because attenuation scales with sqrt(f), a cable acceptable at 100 MHz can lose three times as much power at 900 MHz. Always evaluate the attenuation specification at the highest operating frequency and budget a further 3 dB for connector loss and temperature derating before finalising cable type.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">What Are the Technical Specifications to Watch?<\/span><\/b><\/h2>\n<table style=\"height: 350px;\" width=\"888\">\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><b><span data-font-family=\"Arial\">Parameter<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"113.33333333333333\"><b><span data-font-family=\"Arial\">RG-58 \/ Typical<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"113.33333333333333\"><b><span data-font-family=\"Arial\">LMR-400 \/ Typical<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><b><span data-font-family=\"Arial\">Unit<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"190.66666666666666\"><b><span data-font-family=\"Arial\">Compliance<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><span data-font-family=\"Arial\">Characteristic impedance<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"113.33333333333333\"><span data-font-family=\"Arial\">50 \u00b1 2<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"113.33333333333333\"><span data-font-family=\"Arial\">50 \u00b1 1<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">\u03a9<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"190.66666666666666\"><span data-font-family=\"Arial\">IEC 61196-1<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><span data-font-family=\"Arial\">Attenuation @ 100 MHz<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"113.33333333333333\"><span data-font-family=\"Arial\">0.66<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"113.33333333333333\"><span data-font-family=\"Arial\">0.22<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">dB\/m<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"190.66666666666666\"><span data-font-family=\"Arial\">IEC 61196-1<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><span data-font-family=\"Arial\">Attenuation @ 1 GHz<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"113.33333333333333\"><span data-font-family=\"Arial\">2.3<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"113.33333333333333\"><span data-font-family=\"Arial\">0.73<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">dB\/m<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"190.66666666666666\"><span data-font-family=\"Arial\">IEC 61196-1<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><span data-font-family=\"Arial\">Velocity factor (VF)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"113.33333333333333\"><span data-font-family=\"Arial\">0.66<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"113.33333333333333\"><span data-font-family=\"Arial\">0.85<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">\u2014<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"190.66666666666666\"><span data-font-family=\"Arial\">IEC 61196-1<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><span data-font-family=\"Arial\">Max operating voltage<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"113.33333333333333\"><span data-font-family=\"Arial\">500<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"113.33333333333333\"><span data-font-family=\"Arial\">1,000<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">V RMS<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"190.66666666666666\"><span data-font-family=\"Arial\">UL 444<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><span data-font-family=\"Arial\">Shielding effectiveness<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"113.33333333333333\"><span data-font-family=\"Arial\">55 (single braid)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"113.33333333333333\"><span data-font-family=\"Arial\">90 (foil+braid)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">dB<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"190.66666666666666\"><span data-font-family=\"Arial\">IEC 62153-4-3<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><span data-font-family=\"Arial\">Operating temperature<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"113.33333333333333\"><span data-font-family=\"Arial\">-40 to +80<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"113.33333333333333\"><span data-font-family=\"Arial\">-40 to +85<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">\u00b0C<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"190.66666666666666\"><span data-font-family=\"Arial\">UL 444 \/ MIL-C-17<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><span data-font-family=\"Arial\">Centre conductor<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"113.33333333333333\"><span data-font-family=\"Arial\">Cu, 0.9 mm solid<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"113.33333333333333\"><span data-font-family=\"Arial\">Cu, 2.74 mm solid<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">\u2014<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"190.66666666666666\"><span data-font-family=\"Arial\">ASTM B33<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><span data-font-family=\"Arial\">RoHS \/ REACH<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"113.33333333333333\"><span data-font-family=\"Arial\">Compliant<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"113.33333333333333\"><span data-font-family=\"Arial\">Compliant<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">\u2014<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"190.66666666666666\"><span data-font-family=\"Arial\">EU 2011\/65\/EU<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b><span data-font-family=\"Arial\">How Do These Specifications Affect Real-World Performance?<\/span><\/b><\/h3>\n<ul>\n<li><b><span data-font-family=\"Arial\">Attenuation with temperature: <\/span><\/b><span data-font-family=\"Arial\">Attenuation rises ~0.2 % per \u00b0C above 25\u00b0C; a 10-metre RG-58 run at 6.6 dB loss at 25\u00b0C reaches 7.9 dB at 85\u00b0C, enough to drop a marginal GPS link.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Velocity factor and electrical length: <\/span><\/b><span data-font-family=\"Arial\">Resonant structures (quarter-wave stubs, balun windings) must be cut to physical length = target wavelength x VF; a 10 % VF error shifts a 900 MHz notch filter 90 MHz off-band.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Shielding and CISPR 25: <\/span><\/b><span data-font-family=\"Arial\">Single-braid RG-58 at 55 dB shielding fails CISPR 25 Class 5 by 35 dB above 1 GHz; foil-plus-braid or semi-rigid construction is required.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">What Are the Cable Types and Configuration Options?<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"Arial\">Cable Form Factors<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Flexible cables (RG-58, LMR-series) are ideal for field routing and repeated flexing. For radar and base stations, semi-rigid cable offers maximum shielding (&gt;100 dB) and phase stability (&lt;1<\/span><span data-font-family=\"Arial\"> \u00b0<\/span><span data-font-family=\"Arial\">\/<\/span><span data-font-family=\"Arial\">\u00b0<\/span><span data-font-family=\"Arial\">C} drift), while conformable versions provide similar performance with hand-formability. For space-constrained UAV or smartphone payloads, micro-coax (0.81 mm OD) is the standard .<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Dielectric and Jacket Material Variants<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Solid PE is the economical choice for sub-1 GHz use, while foamed PE reduces attenuation by 40% for longer runs above 500 MHz. PTFE is mandatory for MIL-C-17 aerospace applications up to +200\u00b0C. For protection, specify PVC for indoors, PE for burial\/UV, or LSZH for rail and public safety compliance (IEC 60332-1).<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">How Is Coaxial Cable Used in Real-World Application Scenarios?<\/span><\/b><\/h2>\n<ol>\n<li><b><span data-font-family=\"Arial\">5G Small-Cell Antenna Feed: <\/span><\/b><span data-font-family=\"Arial\">At 3.5 GHz (5G NR Band n78), a 5-metre feed cable must limit attenuation to 2 dB to preserve link budget; LMR-240 (0.38 dB\/m at 3.5 GHz) achieves this in 5 m while fitting within the 19 mm diameter constraint of a small-cell radome enclosure.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Automotive GNSS\/LTE Roof-Mounted Antenna: <\/span><\/b><span data-font-family=\"Arial\">In-vehicle RF cables must pass CISPR 25 Class 5 shielding, survive \u221240\u00b0C to +125\u00b0C under-hood excursions, and maintain impedance within 50 \u00b1 2 \u03a9 throughout; RG-58 variants with foil-plus-braid shield and XLPE jacket qualified to ISO 14572 are the standard solution.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Industrial IoT Gateway to External Antenna: <\/span><\/b><span data-font-family=\"Arial\">An outdoor LoRaWAN gateway at 868 MHz with a 15-metre mast run requires LMR-400 (0.22 dB\/m) to limit cable loss to 3.3 dB, preserving the 125 dB link budget needed for 5 km rural coverage; RG-58 in the same run would dissipate 9.9 dB, cutting range by more than half.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Medical Ultrasound Probe Interconnect: <\/span><\/b><span data-font-family=\"Arial\">High-frequency ultrasound transducers at 5\u201315 MHz use miniature 50 \u03a9 micro-coax (0.81 mm OD) assemblies with silver-plated Cu centre conductors and PTFE dielectric to achieve the sub-0.1 dB insertion loss and phase matching (&lt; 2\u00b0 variation) required for coherent beamforming across a 128-element phased array.<\/span><\/li>\n<\/ol>\n<h2><b><span data-font-family=\"Arial\">Find Your Coaxial Cable <a href=\"https:\/\/www.lcsc.com\/\">on LCSC<\/a><\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">LCSC stocks coaxial cable assemblies and raw coaxial cable from Amphenol, Molex, and Hirose, alongside competitively priced Asian manufacturers including Cvilux, RONGLAN, and Junkonn, covering impedances of 50 \u03a9 and 75 \u03a9, outer diameters from 0.81 mm micro-coax to 10.3 mm LMR-400 equivalents, and connector terminations in SMA, SMB, BNC, MCX, and U.FL\/IPEX formats.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Key sourcing filters available on LCSC:<\/span><\/b><\/h3>\n<ul>\n<li><span data-font-family=\"Arial\">Characteristic impedance (50 \u03a9 \/ 75 \u03a9)<\/span><\/li>\n<li><span data-font-family=\"Arial\">Cable outer diameter \/ form factor (micro-coax, RG-58 equiv., LMR-400 equiv.)<\/span><\/li>\n<li><span data-font-family=\"Arial\">Connector type (SMA \/ BNC \/ MCX \/ U.FL \/ MMCX)<\/span><\/li>\n<li><span data-font-family=\"Arial\">Operating frequency range (up to 1 GHz \/ up to 6 GHz \/ up to 18 GHz)<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">How Do 50 \u03a9 and 75 \u03a9 Coaxial Cables Compare?<\/span><\/b><\/h2>\n<table style=\"height: 306px;\" width=\"871\">\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><b><span data-font-family=\"Arial\">Parameter<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><b><span data-font-family=\"Arial\">50 \u03a9 Coaxial<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"157.33333333333334\"><b><span data-font-family=\"Arial\">75 \u03a9 Coaxial<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"173.33333333333334\"><b><span data-font-family=\"Arial\">Best For<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><span data-font-family=\"Arial\">Impedance standard<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><span data-font-family=\"Arial\">50 \u03a9 \u00b1 1\u20132 \u03a9<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"157.33333333333334\"><span data-font-family=\"Arial\">75 \u03a9 \u00b1 1\u20132 \u03a9<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"173.33333333333334\"><span data-font-family=\"Arial\">50 \u03a9 for RF transmit\/receive; 75 \u03a9 for video and CATV<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><span data-font-family=\"Arial\">Attenuation (RG-58 vs RG-59 equiv.)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><span data-font-family=\"Arial\">0.66 dB\/m @ 100 MHz<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"157.33333333333334\"><span data-font-family=\"Arial\">0.56 dB\/m @ 100 MHz<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"173.33333333333334\"><span data-font-family=\"Arial\">75 \u03a9 slightly lower loss at equivalent OD<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><span data-font-family=\"Arial\">Power handling<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><span data-font-family=\"Arial\">Higher (lower impedance = more current capacity)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"157.33333333333334\"><span data-font-family=\"Arial\">Lower power rating at equal conductor size<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"173.33333333333334\"><span data-font-family=\"Arial\">50 \u03a9 for transmitters, amplifiers, antenna tuners<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><span data-font-family=\"Arial\">Ecosystem \/ connectors<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"146.66666666666666\"><span data-font-family=\"Arial\">SMA, N, BNC, TNC, SMP widely available<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"157.33333333333334\"><span data-font-family=\"Arial\">F, RCA, BNC-75 for broadcast and CATV<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"173.33333333333334\"><span data-font-family=\"Arial\">75 \u03a9 for HDTV, CATV, satellite; 50 \u03a9 for all RF comms<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b><span data-font-family=\"Arial\">Quick Selection Guide<\/span><\/b><\/h3>\n<ul>\n<li><b><span data-font-family=\"Arial\">RF transmitter or transceiver application? \u2192 <\/span><\/b><span data-font-family=\"Arial\">Always 50 \u03a9; power handling and connector ecosystem strongly favour it over 75 \u03a9.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Video distribution or CATV\/satellite? \u2192 <\/span><\/b><span data-font-family=\"Arial\">Always 75 \u03a9; the 75 \u03a9 standard is embedded in every HDTV, CATV amplifier, and satellite LNB interface.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Loss is the binding constraint above 1 GHz? \u2192 <\/span><\/b><span data-font-family=\"Arial\">Select LMR-400 or equivalent low-loss 50 \u03a9 cable; its foamed PE dielectric cuts attenuation by 65 % versus RG-58.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Shielding must meet CISPR 25 Class 5? \u2192 <\/span><\/b><span data-font-family=\"Arial\">Specify foil-plus-braid construction (90 dB SE minimum); single-braid types fail automotive EMC limits above 1 GHz.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Operating temperature above +85\u00b0C? \u2192 <\/span><\/b><span data-font-family=\"Arial\">Switch to PTFE-dielectric cable rated to +200\u00b0C; PE-dielectric cables soften and fail above +80\u00b0C under sustained load.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">Conclusion: <a href=\"https:\/\/www.lcsc.com\/category\/84.html\">Choosing the Right Coaxial Cable<\/a> for Your Design<\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">Coaxial selection hinges on the trade-off between attenuation, cost, and form factor. While low-loss cables require larger diameters and foamed dielectrics, standard RG-58 cables prioritize flexibility and low cost. The critical decision threshold is 3 dB total loss; exceeding this requires a higher-grade cable or an LNA.<\/span> <span data-font-family=\"Arial\">Key selection factors include operating temperature, shielding effectiveness, and bend radius. The governing principle is that 3 dB of feed-line loss halves signal power, and post-amplification cannot recover the resulting SNR degradation.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">Frequently Asked Questions<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"Arial\">Q: How do I calculate the maximum cable run length before a signal amplifier is needed?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Divide the total allowable cable loss from the link budget (total path loss minus connector loss minus 3 dB margin) by the cable\u2019s attenuation in dB\/m at the highest operating frequency. A 6 dB budget at 1 GHz allows 2.6 m of RG-58 (2.3 dB\/m) or 8.2 m of LMR-400 (0.73 dB\/m) before an LNA is required.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Q: Does it matter if I mix 50 \u03a9 and 75 \u03a9 components in the same RF chain?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">A 50 \u03a9 to 75 \u03a9 mismatch produces a reflection coefficient of 0.2 and a return loss of only 14 dB, degrading receiver noise figure by up to 1 dB \u2014 enough to drop a GPS or LTE link below minimum detectable signal in a tightly budgeted RF front end. Always use matching pads or maintain a single impedance standard throughout an RF chain.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Q: How should coaxial cable be routed to meet CISPR 25 automotive shielding requirements?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">CISPR 25 Class 5 requires shielding effectiveness of at least 90 dB above 1 GHz, met only with foil-plus-braid or solid-outer (semi-rigid) cable construction; the shield must terminate to chassis with a 360\u00b0 bond at both ends, as pigtail grounds fail above 100 MHz. Maintain at least 50 mm separation from CAN, LIN, and ignition harnesses, and route along grounded chassis members where separation is not feasible.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Q: How do I second-source a coaxial cable assembly if the original supplier cannot deliver?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Match five parameters from the original datasheet: impedance (\u00b1 1 \u03a9), attenuation at the highest operating frequency (\u00b1 5 %), velocity factor (\u00b1 0.01), connector interface standard (SMA per MIL-PRF-39012 or BNC per IEC 61169-8), and jacket temperature rating. Confirm with insertion loss and return loss sweeps from 100 MHz to the maximum operating frequency before switching production.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Q: What bending radius rules apply to coaxial cable to avoid impedance degradation?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">The minimum bend radius for flexible coaxial cable is 10 times the outer diameter (OD) under static conditions and 20 times OD for repeated flexing per IEC 61196-1. Bending tighter deforms the dielectric, shifts impedance by 2\u20135 \u03a9 at the kink, and creates a return-loss null at the frequency where the deformed length equals a quarter wavelength \u2014 a fault that shows up only under cable movement and requires a VNA to locate.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Key Takeaways 3 dB\/m threshold: When cable loss exceeds 3 dB\/m at the operating frequency, switch to a lower-loss type \u2014 no downstream amplifier recovers the noise figure lost in the feed cable. 50 \u03a9 vs 75 \u03a9 is non-negotiable: A 50 \u03a9 \/ 75 \u03a9 mismatch produces a 14 dB return loss and degrades [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":1,"footnotes":""},"categories":[1],"tags":[41,21],"class_list":["post-207","post","type-post","status-publish","format-standard","hentry","category-technical-guides","tag-cable","tag-coaxial-cable"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - 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