1st post : Feb 20, 1998
Last update : Dec 15, 2022
LOGO

LOOP ANTENNA


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§éÅ|°¸·¥¤Ñ½u¬O 30 ¦~¥N¥½´Á¥Ñ Kraus / W8JK ©Ò³]­pµo®i¥X¨Ó¡A¦b 40 ¦~¥N¬Û ·íªº¬y¦æ¡C¹Ï¤@ (A) ~ (D) ²M·¡ªºÅã¥Ü¤F§éÅ|°¸·¥ªº¤u§@­ì²z¡C

From Dipole To Folded Dipole

¹Ï¤@ (A) ¬O¤@­Ó´¶³qªº°¸·¥¤Ñ½u¡A½bÀY¤è¦V¥Nªí¬Y¤@Àþ¶¡°¸·¥¤Ñ½u¤Wªº¹q¬y¤è ¦V¡C¦pªG¦b°¸·¥¤Ñ½uªº¤@ºÝ¦A¥[¤W¤@¬q 1/2 £fªº¹q½u¡]´N¬O¦A¥[¤W¤@¬q°¸·¥ ¤Ñ½u¡^¡A¥¦´NÅܦ¨¤F¦b 3/4 £fõX¹qªº Long Wire Antenna ¡A¦ý½Ðª`·N¨â¬q°¸·¥¤Ñ ½u¤Wªº¹q¬y¤è¦V¬O¬Û¤Ïªº¡A¦p¹Ï¤@ (B) ©Ò¥Ü¡C¦pªG§Ú­Ì§â¥[¤W¥hªº°¸·¥¤Ñ½u§é¹L ¨Ó¡A¨º»ò¨â¬q°¸·¥¤Ñ½u¤Wªº¹q¬y¤è¦V´N·|¦P¦V¡A¦p¹Ï¤@ (C)¡A³Ì«á±N¨âºÝ¬Û±µ´N§Î ¦¨¤F§éÅ|°¸·¥¤Ñ½u¡C

¥Ñ©ó§éÅ|°¸·¥¤Ñ½u¤Wªº¨â¬q°¸·¥¤Ñ½u¥iµø¬°¨ÃÁp¡A©Ò¥H¤À§G¦b³o¨â¬q°¸·¥¤Ñ½u¤Wªº ¹q¬y¶È¬°´¶³q°¸·¥¤Ñ½u¤Wªº¤@¥b¡C°²³]±N¥\²v¬° P ªº«H¸¹¿é¤J³æ¤@¤ä°¸ ·¥¤Ñ½u¡A¦Ó¤À§G¦b³o¤ä°¸·¥¤Ñ½u¤Wªº¹q¬y¬° I¡A¥B°¸·¥¤Ñ½uªº¿é¤Jªý§Ü¬° RD¡A«h

P = I2 * RD

­Y±N¬Û¦Pªº«H¸¹¿é¤J§éÅ|°¸·¥¤Ñ½u¡A«h¤À§G©ó¨â¬q°¸·¥¤Ñ½u¤Wªº¹q¬y¬° I/2¡A§é Å|°¸·¥¤Ñ½uªº¿é¤Jªý§Ü¥Î RFD ¥Nªí¡A«h

P = ( I/2 )2 * RFD

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I2 * RD = ( I/2 )2 * RFD ===> RFD = 4 * RD

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Folded Impedance

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§éÅ|°¸·¥¤Ñ½uªº¯S©Ê°ò¥»¤W©M¤@¯ëªº°¸·¥¤Ñ½u¬O¬Û¦Pªº¡A¦Ó¥B¥¦ªº¼W¯q©M°¸·¥¤Ñ½u¤@¼Ë ³£¬O 0 dB¡C¦]¬°¥¦¬O«Ê³¬°j¸ô¡A©Ò¥HÀô¹Ò¹ï¨ä¿é¤Jªý§Üªº¼vÅT·|¤ñ¹ï¤@¯ëªº°¸·¥¤Ñ½u ªº¼vÅT¨Óªº¤p¤@¨Ç¡A¥[¤W§Ú­Ì­n¨Ï¥Î 4:1 ªºªý§ÜÂà´«¤~¯à±N¤Ñ½uªº¿é¤Jªý§Ü©MµL½u¹q ¾÷ªº¿é¥Xªý§Ü¤Ç°t¡A©Ò¥H¦bªý§ÜÂà´«¥H«á­ì¥ýÀô¹Ò¹ï¤Ñ½u©Ò³y¦¨ªºªý§ÜÅܤÆÁÙ·|Åܱo§ó ¤p¡C³o­Ó¯S©Êªº¦n³B¬O¡GÅÜ´«¬[³]Àô¹Ò¹ï¤Ñ½uªý§ÜªºÅܤƤ£¤j¡A¦]¦¹¥i¥H¦b¤ñ¸û§Cªº¦ì ¸m½Õ¾ã¤Ñ½uªºªø«×¡]¤è«K½Õ¾ã¡^¡A½Õ¾ã¦n¥H«áª½±µ§â¤Ñ½u¤É°ª´N¥i¥H¨Ï¥Î¡F­Y¬O²¾°Ê³q «H¨Ï¥Î§éÅ|°¸·¥¤Ñ½u¡A´N¤£¥²¨C¦¸³£­n½Õ¾ã¤Ñ½uªºªø«×¡A¬Û·íªº¤è«K¡C

»s§@§éÅ|°¸·¥¤Ñ½u³Ì²«Kªº¤èªk¬O¨Ï¥Î 300£[ªº¥­¦æ¶Ç¿é½u¨Ó°µ¤Ñ½uªº¥»Åé¡A¦]¬°³o ¬O¬[³]¨â±ø¥­¦æ½u³Ì²³æªº¤èªk¡C¤£¹L°ê¤ºªº 300£[¥­¦æ¶Ç¿é½uªº«~½è´¶¹M¤£¨}¡A¥² ¶·ÁקK¾Z±µÂI¨ü¨ì¤O¶qªº©Ô§è¡A¦pªG·Q­n©T©w¬[³]ªø´Á¨Ï¥Î¡A³Ì¦nÁÙ¬O¨Ï¥Î¤@¯ëªº¹q½u ¶¡¹j 10 ~ 30 ¤½¤À¨Ó¬[³]¤ñ¸û¨c¾a¡]ÀW²v§C¡A¶¡¹j¥i¥H¤j¤@¨Ç¡FÀW²v°ª¡A¶¡¹j¥i¥H¤p ¤@¨Ç¡^¡C¦Ü©ó¶Ç¿é½u¥i¥H¨Ï¥Î 300£[¥­¦æ¶Ç¿é½u©Ô¦ÜµL½u¹q¾÷ªþªñ¦A¥Î 4:1 Balun Âà ´««á¥Î 50£[¦P¶b¹qÆl±µ¨ìµL½u¹q¾÷¡A³o¼Ë°µªº¦n³B¬O­°§C¦¨¥»¡]¥­¦æ¶Ç¿é½u«Ü«K©y¡^ ¥H¤Î°I´î¤Ö¡]¥­¦æ¶Ç¿é½uªº°I´î¶q¤ñ¦P¶b¹qÆl§C¡^¡A¤£¹L­nª`·N¥­¦æ¶Ç¿é½u­nºÉ¶q»·Â÷ Àð¾À¡C·íµM±z¤]¥i¥H±N 4:1 Balun ¸Ë¦b§éÅ|°¸·¥ªºõX¤JºÝµM«áª½±µ¥Î¦P¶b¹qÆl±µ¨ìµL ½u¹q¾÷¡A³o¼Ë³B²z°_¨Ó·|¤ñ¸û¤è«K¡C¨âºØ¤èªk¦p¦ó¿ï¾Ü§¹¥þ¬Ý±z¬[³]¤Ñ½u®Éªº¦Ò¶qÂI¬° ¦ó¡C

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¥H§Ú­Ó¤Hªº¸gÅç¡A¥Î 300£[¥­¦æ¶Ç¿é½u©Ò§@¦¨ªº§éÅ|°¸·¥¤Ñ½u¦b³¥¥~²¾°Ê³q«H¬Û·íªº ¦n¥Î¡A¦]¬°

  • ­«¶q»´¡A¦]¬°¤£»Ý­n±a¦P¶b¹qÆl¡C
  • ®e©ö¬[³]¡A¦]¬°õX½u¤Î¤Ñ½u¥»¨­«Ü»´¡A©Ò¥H¤£»Ý­n¤Ó±j©Tªº¤ä¼µª«´N¥i¥H§â¤Ñ ½u¬[³]±o«Ü¬üÆ[¡C¦pªG¨Ï¥Î¦P¶b¹qÆl¡A¤Ñ½u¤¤¥¡ªº¤ä¼µª«´N¤£¯à¤Ó°¨ªê¡C
  • ¥u­n¤£¬O¤ÓÂ÷ÃЪº¬[³]Àô¹Ò¡A¤Ñ½u´X¥G¤£¥²­«·s½Õ¾ã´N¥i¥H¨Ï¥Î¡C
  • ¦pªG¨S¦³ 4:1 Balun ¨Ó¤Ç°t¡A¥i¥H°Ñ¦Ò Portable Folded Dipole Antenna ùتº¤èªk¡A¥u­n¤@­Ó¥iÅܹq®e´N·d©w¤F¡C


Quad Loop (Square Loop)

¬[³] Loop Antenna ªº°ò¥»­ì«h¬OºÉ¥i¯à¨Ï¤Ñ½u³ò¨ì³Ì¤jªº­±¿n¡A´«¨¥¤§¡A¶ê§Îªº Loop ®Ä¯q³Ì°ª¡A¤£¹L¦b HF ÀW¬q­n¬[³]¶ê§Îªº Loop ¨Ã¤£¬O¨º»ò®e©ö¡A¦Ó¤è§Îªº Loop ¬[³]®e©ö¡A©Ò¥H³Q´¶¹MªºÀ³¥Î¦b¦UºØ³õ¦X¡C¦p¹Ï¤T©Ò¥Ü¡AQuad Loop ¦³¨âºØ ±`¨£ªº¬[³]¤èªk¡A§Y««ª½©ó¦a­±ªº¤è§Î Loop »P««ª½©ó¦a­±ªºµÙ§Î Loop¡A¨ä¿ç®g³õ§Î¡B¹qªiªº·¥¤Æ­±»PõX¹q¦ì¸m¦³Ãö¡C¤U¹Ï(A) ¬°¤ô¥­°¾ªi¡A(B) ¬°««ª½°¾ªi¡C

Square Loop Antenna


¤U¹Ï¬O¦b¤U¤è©Î¤W¤èõX¹qªº¿ç®g³õ§Î(©ó Free Space)¡AÂŦ⬰¤ô¥­°¾ªi¡A¬õ¦â¬°««ª½°¾ªi¡C¥Ñ¹Ï¥i¬Ý¥X¤ô¥­°¾ªi¬O¥D­nªº¿ç®g³õ¡A§Îª¬´N¹³««ª½©ó¦a­±ªºªº²¢²¢°é¡C¹Ï¤¤ÁöµM¦s¦b««ª½°¾ªi³õ(¬õ¦â)¡A¦ý¦]¬°§Îª¬¬Û·í«ó¡A±j«×¤]«Ü®z¡A¥iµø¬°¤£¦s¦b¡C¦b HF ÀW¬q¦]¬°¤Ñ½u¤Ø¤o¤ñ¸û¤j¡A¦b¤U¤èõX¹q¤ñ¸û¤è«K¬I§@¡A¤j¦h±Ä¥Î¦¹¤è¦¡õX¹q¡C

Field for Loop Feed Point at Top or Bottom


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Field for Loop Feed Point at Left or Right


¥t¤@ºØõX¹q¤è¦¡¬O¦b¤è§Î Loop ªº¬Y­Ó¨¤©ÎµÙ§Î Loop ªº¬Y­ÓÃäõX¹q¡A³o¼Ë·|¦P®É¦s¦b¤ô¥­°¾ªi»P««ª½°¾ªiªº³õ¡A¦ý¬O¦U§Oªº³õ±j³£·|¤ñ¤W¨âºØ¤è¦¡¤Ö 3dB¡A¥Ñ©ó³oºØ¤è¦¡¬I§@¤ñ¸û³Â·Ð¥B¨S¦³¯S§OªºÀuÂI¡A¤@¯ë¤£±Ä¥Î¦¹õX¹q¤è¦¡¡C

Field for Loop Feed Point at Left-Right Corner

¤£ºÞ¬O­þ¤@ºØ¬[³]¤èªk¡AQuad Loop §¡¦³¥H¤U¯S©Ê

  • ¾ã­Ó Loop ªºªø«×¤ñ¤@­Ó£f²¤ªø¡A¤j¬ù¬° 306.525m / f(MHz)
  • õX¹qÂIªºªý§Ü¬ù¬° 100£[
  • »P°¸·¥¤Ñ½u¤ñ¸û¬ù¦³ 1 dBD ªº¼W¯q
  • ¥Dªi§ôªº¤è¦V»P Loop ³ò¦¨ªº¥­­±««ª½¡A¦b Loop ¥­­±©¹¥~©µ¦ùªº¤è¦V¦¬µo«H ¸¹®ÄªG³Ì®t¡A´N¦n¤ñ®³µÛ®°¤lݵ­·¡Aݵ°_¨Ó¦³­·ªº¤è¦V°T¸¹³Ì¦n¡Aݵ°_¨Ó¨S­· ªº¤è¦V°T¸¹³Ì®t¡C
  • ¦b²z·Q±ø¥ó¤U¥i¥H¦b­¿ÀW¨Ï¥Î¡A¹ê»Ú¤W¦]¬°¤Ñ½u¨ü¨ì ©P³ò«Ø¿vª«ªº¼vÅT¡A¥i¯à»Ý­n²¤·L½Õ¾ã¤~¥i¥H¦b­¿ÀW¨Ï¥Î¡C¦¹¥~¡A­¿ÀW¨Ï¥Î®É¡A¹q¬yªº¤À§G¤w¸g»P¤@­Óªiªøªº Loop ¤£¦P¡A©Ò¥H¹qªiªº·¥¤Æ­±»P¿ç®g³õ§Î¤]»P¤@­Óªiªøªº Loop §¹¥þ¤£¦P¡C

Quad Loop ¥t¤@­Ó¤ñ¸û°g¤Hªº¯S©Ê¬O¦a­±¹ï¥¦ªº¼vÅT¤ñ¸û¤Ö¡A¥¦ªº¿ç®g¥õ¨¤¤ñ¦b¬Û ¦P°ª«×ªº°¸·¥¤Ñ½u§C¡A¨Ò¦p¬[³]°ª«×¦P¬° 1/2 £f¡A°¸·¥¤Ñ½uªº¿ç®g¥õ¨¤¬ù¬° 30 ¢X¡A¦Ó Quad Loop ¥u¦³ 26¢X¡A­Y¬[³]°ª«×¦P¬° 3/8 £f¡A°¸·¥¤Ñ½uªº¿ç®g¥õ¨¤¬ù ¬° 40¢X¡A¦Ó Quad Loop ¥u¦³ 30¢X¡A­Y¬[³]°ª«×¦P¬° 1/4 £f¡A°¸·¥¤Ñ½uªº¿ç®g ¥õ¨¤´²§G¦b 40 ~ 90¢X¡A¤]´N¬O»¡´ÂµÛ¤ÑªÅ¡A¦Ó Quad Loop ¥u¦³ 40¢X¡C

¥Ñ©ó Quad Loop ªº¿é¤Jªý§Ü¬ù¬° 100£[¡A­n¦p¦ó³B²z¤Ç°tªº°ÝÃD¹ï·s¤â¦Ó¨¥­Ë¬O ¤ñ¸û¥O¤HÀYµhªº¤@ÂI¡A¨ä¹ê¤]¤£·|«Ü§xÃø¡A¤èªk¤£¥~¥G¤U¦C´XºØ¡G

  • ¨Ï¥Î 2:1 ªº Balun¡A¤£¹L³oºØ Balun ¥«­±¤W¨S±o¶R¡C
  • ¨Ï¥Î Open Stub ¨Ó½Õ¾ã¡A°Ó¥Îªº Cubic Quad ³£¬O¥Î³oºØ¤è¦¡¨Ó½Õ¾ã¡C
  • ¨Ï¥Î Open Wire ¨Ó°µ¶Ç¿é½u¡AµM«á¥Î 1:1 ªº BALUN ¦A¥Î ATU ¨Ó½Õ¿Ó¡C¦pªG §Aı±o Open Wire ¦b¬[³]®É­nª`·Nªº²Ó¸`¤Ó¦hªº¸Ü¡A¤]¥i¥H¨úµ¥ªøªº 50£[ ¦P¶b¹qÆl±NÀY§À¨âºÝªº¹jÂ÷ºô¬Û±µ¡A©ó¬O¨â®Ú¤ß½u´NÅܦ¨¤F 100£[ªº¥­¦æ¶Ç ¿é½u¡A³oºØ¥Ñ¦P¶b¹qÆl§Î¦¨ªº¥­¦æ¶Ç¿é½u¥i¥H¾aµÛÀð¾À¬[³]¡A¤]¥i¥H«æÂàÅs©Î ±²¦±¡A¥Î°_¨Ó´N©M¦P¶b¹qÆl¤@¼Ë¡C¡]¦p¹Ï¥|¡^
  • ¥Ñ©ó Yagi ªºªý§Ü³q±`¬O³æ¤@¤¸¥óªý§Üªº¤@¥b©Î§ó§C¡A§â¦h­Ó Lopp °µ¦¨ Yagi ªº®É­Ôªý§Ü´N±µªñ 50£[¡A­Y¤£¦Ò¼{¼W¯qªº³Ì¤j¤Æ¡A´N¥i¥H¾a½Õ¾ã¤¸¥óªº¶¡¶Z¨Ïªý§ÜÅܦ¨ 50£[¡A¦p¦¹´N¤£»ÝÃB¥~ªº¤Ç°t¡A¥i¥Hª½±µõX¹q¡C
Use Coax Line to Form Two Wire Feeder


Delta Loop

¤T¨¤§Îªº Loop À³¸Ó¬Oµ²ºc³Ì²³æªº Loop¡A¦]¦¹³q±`³Q¼sªxÀ³¥Î¦b¸û§CªºÀW¬q¡C

¦p«e­±©Ò¨¥¡ADelta Loop ©Ò³ò¦¨ªº­±¿n¥Ñ©ó¤ñ Quad Loop ¨Óªº¤p¡A©Ò¥H¥¦ªº¼W¯q ¤j¬ù¥u¦³ 0.5 dBD¡A¦pªG Delta Loop ¶V«ó¡A¥¦ªº¯S©Ê´N¶V±µªñ§éÅ|°¸·¥¤Ñ½u¡A¤£¹L¦b ³o¸Ì§Ú­Ì·Q­n°Q½×ªº¬Oµ¥Ãä¤T¨¤§Îªº Delta Loop¡C

Delta Loop Antenna

¹ê¥Î¤W¨Ó»¡¡ADelta Loop ¤j·§¦³¤U­± 5 ºØ¬[³]¤èªk¡A¦p¹Ï¤­ (A) ~ (E)¡C Delta Loop ªº¦³®Ä°ª«×¬O¥H¤T¨¤§Îªº­«¤ß¦ì¸m¨Ó­pºâ¡A¤j¬ù¬OÂ÷©³Ãä 1/12 £fªº¦ì¸m ¡C¤U­±¹ï¤­ºØ¬[³]¤è¦¡ªº°Q½×³£¬O°²³] Delta Loop ªº¦³®Ä°ª«×¬° 1/2 £f¡C¹Ï¤­ (A) ©M (C) ªº¬[³]¤è¦¡¡A¥¦ªº¿ç®g¥õ¨¤°ª¹F 80¢X¡A§¹¥þ¤£¾A©ó DX ³q«H¡C¹Ï¤­ (D) ªº¬[³]¤è¦¡¨ä¿ç®g¥õ¨¤¬ù¬° 47¢X¡A¤]¤£¾A¦X»·¶ZÂ÷³q«H¡C¯u¥¿¾A¦X DX ³q«H ªº¬[³]¤è¦¡¬O (B) ©M (E)¡A(B) ªº¿ç®g¥õ¨¤¤j¬ù¬O 27¢X¡A(E) ¤j¬ù¬O 20¢X¡C

Delta Loop ªº¿é¤Jªý§Ü¤j¬ù¬° 70£[¡A©Ò¥H¥i¥Hª½±µ¥Î 50£[ªº¦P¶b¹qÆl¨Ó³s±µ ¡AÁöµM¦³¤@¨Ç¤£¤Ç°t¡A¦ý³q±`¥u­n¥[¤W ATU ´N¥i¥H¸Ñ¨M¤£¤Ç°tªº°ÝÃD¡C


¤U¹Ï¬ODelta Loop ¦b¤U¤è©Î¤W¤èõX¹qªº¿ç®g³õ§Î(©ó Free Space)¡AÂŦ⬰¤ô¥­°¾ªi¡A¬õ¦â¬°««ª½°¾ªi¡C¥Ñ¹Ï¥i¬Ý¥X¤ô¥­°¾ªi¬O¥D­nªº¿ç®g³õ¡C

Field of Delta Loop Feed at Top or Bottom


¤U¹Ï¬ODelta Loop ¦b°¼Ãä©Î°¼Ã䪺¨¤¸¨õX¹qªº¿ç®g³õ§Î(©ó Free Space)¡AÂŦ⬰¤ô¥­°¾ªi¡A¬õ¦â¬°««ª½°¾ªi¡C¥Ñ¹Ï¥i¬Ý¥X¦P®É¦³¤ô¥­/««ª½°¾ªi¡A¦ý¤ô¥­°¾ªi¬O¥D­nªº¿ç®g³õ¡C

Field of Delta Loop Feed at Side or Corner


¤U¹Ï¬ODelta Loop ¤@­ÓÃä««ª½©ó¦a­±¡A¦b««ª½³¡¥÷ªº¤¤¶¡õX¹qªº¿ç®g³õ§Î(©ó Free Space)¡AÂŦ⬰¤ô¥­°¾ªi¡A¬õ¦â¬°««ª½°¾ªi¡C¥Ñ¹Ï¥i¬Ý¥X««ª½°¾ªi¬O¥D­nªº¿ç®g³õ¡C³oºØ¤è¦¡³Ì¤jªºÀuÂI¬O§Y¨Ï¤Ñ½u³Ì§Cªº³¡¥÷±µªñ¦a­±¤´¦³¸û§Cªº¿ç®g¥õ¨¤(¤p©ó 30«×¡AÂ÷¦a¶V°ª¡A¥õ¨¤¶V§C)¡A¦ý¦pªG¦Ò¶q¤Ñ½uªº««ª½³¡¥÷»Ý»P¤ä¼µ¬WÂ÷¶}¤@¬q¶ZÂ÷¤~¤£·|¼vÅT°T¸¹¡A¬[³]¤W¤ñ¸û¤£¤è«K¡A©Ò¥H¦b§CÀW¬q¤]¸û¤Ö¤H³o¼Ë¬[³]¡C

Field of Vertical Delta Loop Feed at Center


¤U¹Ï¬ODelta Loop ¤@­ÓÃä««ª½©ó¦a­±¡A¦b««ª½³¡¥÷ªº©³³¡õX¹qªº¿ç®g³õ§Î(©ó Free Space)¡AÂŦ⬰¤ô¥­°¾ªi¡A¬õ¦â¬°««ª½°¾ªi¡C¥Ñ¹Ï¥i¬Ý¥X¤ô¥­°¾ªi¬O¥D­nªº¿ç®g³õ¡C³oºØ¤è¦¡ªº¿ç®g¥õ¨¤¤¶©ó 40~25«×¡C

Field of Vertical Delta Loop Feed at Bottom

Bi-Quad Âù¯xÀô¤Ñ½u

«e­±´£¨ì³æ¤@­ÓÀô§Î¤Ñ½uªºªý§Ü¬ù¬° 104£[¡A¦pªG±N¨â­ÓÀô§Î¤Ñ½u¨ÃÁp«hªý§Ü¬ù¬° 84£[¡A¦³ 5.2dBi ªº¼W¯q¡ASWR(75£[)=1.13¡ASWR(50£[)=1.69¡A¦Ó¹qµø¨t²Î±Ä¥Î 75£[ªºªý§Ü¡A¥i¥H¨Ï¥Î 75£[ªºõX½uª½±µõX¤J¡A©Ò¥H¥Ø«e¦³¬Û·í¦h°Ó«~©Î DIY ¨Ï¥ÎÂù¯xÀô°µ¬°¼Æ¦ì¹qµøªº±µ¦¬¤Ñ½u¡C

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Horizontal Loop

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07MHz 10MHz
7 MHz
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10 MHz
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14MHz 18MHz
14 MHz
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18 MHz
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21MHz 28MHz
21 MHz
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28 MHz
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BV3FG / Robert Suen