Unterschiede

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--- project:hgg:antenna_design:jpole [2011-12-29 18:17] – angelegt 194.29.227.136
+++ project:hgg:antenna_design:jpole [2012-01-01 16:35] (aktuell) – 92.250.254.221
@@ Zeile 2: / Zeile 2: @@
 ====== Project: HGG - Antenna Design / J-Pole ======
+[[http://shackspace.de/gallery/index.php/Projekte/HGG/jpoledesign|{{http://shackspace.de/gallery/var/thumbs/Projekte/HGG/jpoledesign.png}}]]
+  * A = 3/4 λ
+  * B = 1/4 λ
+  * C = adjust to 50 Ω wave impedance between solder joints
+  * D = 4 turn balun to keep coax line from becoming part of the radiator
+TODO
+  * describe how to fine-tune C
+  * HAM Operators use SWR-Meters, these show the overlay-ratio between in- and out-flowing wave.
+  * An SWR ratio lower than 1:1.5 is ok. 1:1 is perfect
+  * Sadly you need an transmitter to use this methode (you may ask a nearby HAM)
+  * SWR-Meters for 2-meter/70-cm band cost about 50€ for a cheap one
+  * The Cheap CB SWR-Meters are only useful for 11-Meter band
+===== How to tune =====
+  * Nibble away bits on both arms while maintaining the (3/4 λ) / (1/4 λ) ratio.