project:hgg:antenna_design:jpole
up: Project HGG: Antenna Design
Project: HGG - Antenna Design / J-Pole
- 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.
project/hgg/antenna_design/jpole.txt · Zuletzt geändert: 2012-01-01 16:35 von 92.250.254.221