[{"data":1,"prerenderedAt":268},["ShallowReactive",2],{"docs-\u002Fdocs\u002Futilities\u002Fantenna-length":3,"docs-navigation":157},{"id":4,"title":5,"body":6,"description":147,"extension":148,"meta":149,"navigation":150,"order":151,"path":152,"pro":153,"seo":154,"stem":155,"__hash__":156},"docs\u002Fdocs\u002Futilities\u002Fantenna-length.md","Antenna length",{"type":7,"value":8,"toc":141},"minimark",[9,13,18,49,52,58,62,132,135],[10,11,12],"p",{},"The antenna length calculator gives the length of wire for an antenna on a frequency. It shows the length in metres and in feet.",[14,15,17],"h2",{"id":16},"calculate-a-length","Calculate a length",[19,20,21,30,36,43],"ol",{},[22,23,24,25,29],"li",{},"Select ",[26,27,28],"strong",{},"Utilities"," in the navigation bar.",[22,31,24,32,35],{},[26,33,34],{},"Antenna length calculator",".",[22,37,38,39,42],{},"Type the ",[26,40,41],{},"Frequency"," in MHz.",[22,44,45,46,35],{},"Select the ",[26,47,48],{},"Antenna type",[10,50,51],{},"The length shows at the top. To copy the lengths, select the copy button.",[53,54],"doc-screenshot",{":phone":55,"alt":56,"name":57},"true","The antenna length calculator on a phone, showing a 9.97 m half-wave dipole for 14.285 MHz, with 4.98 m for each leg","m-antenna-length",[14,59,61],{"id":60},"antenna-types","Antenna types",[63,64,65,78],"table",{},[66,67,68],"thead",{},[69,70,71,75],"tr",{},[72,73,74],"th",{},"Type",[72,76,77],{},"What it is",[79,80,81,92,102,112,122],"tbody",{},[69,82,83,89],{},[84,85,86],"td",{},[26,87,88],{},"Half-wave dipole",[84,90,91],{},"A centre-fed dipole with two legs of equal length. A good first HF antenna.",[69,93,94,99],{},[84,95,96],{},[26,97,98],{},"End fed half wave (EFHW)",[84,100,101],{},"One half-wave wire, fed at one end through a 49:1 unun. Popular for POTA and portable operation.",[69,103,104,109],{},[84,105,106],{},[26,107,108],{},"Quarter-wave vertical",[84,110,111],{},"A vertical with radials. Good for a small garden.",[69,113,114,119],{},[84,115,116],{},[26,117,118],{},"5\u002F8-wave vertical",[84,120,121],{},"A vertical with more gain than a quarter-wave. Common for 2m and 70cm.",[69,123,124,129],{},[84,125,126],{},[26,127,128],{},"Full-wave loop",[84,130,131],{},"A closed loop, for example a delta or quad loop.",[10,133,134],{},"For a dipole, the calculator also shows the length of each leg. For an EFHW, it also shows the length of the counterpoise.",[136,137,138],"note",{},[10,139,140],{},"The calculator uses a velocity factor of 0.95 for wire. Cut your wire a little long, then trim it to get the best SWR.",{"title":142,"searchDepth":143,"depth":143,"links":144},"",2,[145,146],{"id":16,"depth":143,"text":17},{"id":60,"depth":143,"text":61},"Calculate how much wire you need for common wire antennas.","md",{},true,20,"\u002Fdocs\u002Futilities\u002Fantenna-length",false,{"title":5,"description":147},"docs\u002Futilities\u002Fantenna-length","AncXuvjHPr7z-oNuHEJ2vAu_oN8NPJeCTAOBtzizirw",[158,163,167,172,177,182,187,192,197,202,207,212,217,222,227,232,237,242,247,252,257,258,263],{"path":159,"title":160,"description":161,"order":162,"pro":153},"\u002Fdocs\u002Fstart-here\u002Fcreate-an-account","Create your account","Sign up with your email, log in, and add your callsign.",1,{"path":164,"title":165,"description":166,"order":143,"pro":153},"\u002Fdocs\u002Fstart-here\u002Fcreate-a-logbook","Create a logbook","Make a logbook, pick a template and set up your station.",{"path":168,"title":169,"description":170,"order":171,"pro":153},"\u002Fdocs\u002Fstart-here\u002Flog-your-first-contact","Log your first contact","Type a callsign, select Log contact, and the contact is saved.",3,{"path":173,"title":174,"description":175,"order":176,"pro":153},"\u002Fdocs\u002Fstart-here\u002Fuse-fieldbook-offline","Get ready to log offline","Add Fieldbook to your home screen, and prepare each device before you go out.",4,{"path":178,"title":179,"description":180,"order":181,"pro":153},"\u002Fdocs\u002Flogging\u002Flogbooks","Logbooks","Organise your contacts into logbooks, and pin, edit, merge or delete them.",5,{"path":183,"title":184,"description":185,"order":186,"pro":153},"\u002Fdocs\u002Flogging\u002Fcontacts","Logging contacts","Log, find, edit and delete the contacts in a logbook.",6,{"path":188,"title":189,"description":190,"order":191,"pro":153},"\u002Fdocs\u002Flogging\u002Fqrz-lookups","QRZ lookups","Get the name and location of each operator from QRZ.com, free.",7,{"path":193,"title":194,"description":195,"order":196,"pro":150},"\u002Fdocs\u002Flogging\u002Fqrz-logbook-sync","QRZ Logbook Sync","Send every contact you log to your QRZ.com logbook automatically.",7.5,{"path":198,"title":199,"description":200,"order":201,"pro":153},"\u002Fdocs\u002Flogging\u002Fparks-on-the-air","Parks on the Air","Log a POTA activation, track your QSO count, work park to park, and export an ADIF file for each activation.",8,{"path":203,"title":204,"description":205,"order":206,"pro":153},"\u002Fdocs\u002Flogging\u002Fimport","Import ADIF","Bring your log over from another app with ADIF files.",9,{"path":208,"title":209,"description":210,"order":211,"pro":153},"\u002Fdocs\u002Flogging\u002Fexport-and-backup","Export and backup","Download a logbook as ADIF, or a backup of all of your logbooks.",10,{"path":213,"title":214,"description":215,"order":216,"pro":153},"\u002Fdocs\u002Flogging\u002Fbulk-edit","Bulk edit","Change the station details of many contacts at the same time.",11,{"path":218,"title":219,"description":220,"order":221,"pro":153},"\u002Fdocs\u002Fyour-log\u002Fdashboard","Dashboard","Your totals, countries, streak and activity, across all of your logbooks.",12,{"path":223,"title":224,"description":225,"order":226,"pro":153},"\u002Fdocs\u002Fyour-log\u002Fmap","QSO map","See every contact that you have logged on a world map.",13,{"path":228,"title":229,"description":230,"order":231,"pro":150},"\u002Fdocs\u002Fyour-log\u002Fversion-history","Version history","See each change to a contact, and go back to an earlier version.",14,{"path":233,"title":234,"description":235,"order":236,"pro":150},"\u002Fdocs\u002Fyour-log\u002Ftrash","Trash","Bring back contacts that you deleted in the last 30 days.",15,{"path":238,"title":239,"description":240,"order":241,"pro":153},"\u002Fdocs\u002Fyour-log\u002Fsync-and-offline","Sync and offline","How Fieldbook keeps your log on each device and in the cloud.",16,{"path":243,"title":244,"description":245,"order":246,"pro":153},"\u002Fdocs\u002Futilities\u002Fpota-spots","POTA spots","Live Parks on the Air activations, with the nearest activators first.",17,{"path":248,"title":249,"description":250,"order":251,"pro":153},"\u002Fdocs\u002Futilities\u002Fband-conditions","Band conditions","How each HF band is looking, day and night.",18,{"path":253,"title":254,"description":255,"order":256,"pro":153},"\u002Fdocs\u002Futilities\u002Fmaidenhead-locator","Maidenhead locator","Change coordinates into a grid square, or a grid square into coordinates.",19,{"path":152,"title":5,"description":147,"order":151,"pro":153},{"path":259,"title":260,"description":261,"order":262,"pro":150},"\u002Fdocs\u002Fsettings\u002Fwidgets","Widgets","Show your recent contacts, activity and more on your QRZ page or your website.",21,{"path":264,"title":265,"description":266,"order":267,"pro":153},"\u002Fdocs\u002Fsettings\u002Fappearance","Appearance","Choose light or dark mode, and the font.",22,1793632758110]