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Bygg din egen CL/SPW/Helix
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Jag sitter och läser på ibc crazys tråd och han rekomderar en wave trap och så här står det...
Method #6 - IBCrazy's Wavetrap![/B]
Advantages: Incredibly easy to make, Increases antenna bandwidth substantially
Disadvantage: None!
Since going commercial with these antennas I needed an easier match. While searching for an easier way to match this yet another time, I came up with this one which is so easy it's incredible. All you need to do is cut a rectangle where one side is 1/8 wavelength and the other side is 1/16 wavelength. Put this in the middle of your first quarter turn of the helix. All it does is follow the helix.
Length in inches = 1460/f in MHz
or
Length in cm = 3720/f in MHz
Width in inches = 730/f in MHz
or
Length in cm = 1860/f in MHz
Start point distance away from coaxial feed in inches = 730/f in MHz
Simply solder this to your helix. The center of the match should be the center of your first 1/4 turn. Very simple and it works!
Men jag får inte ihop hur jag ska räkna ut startpunkten för min wave trap...Kommentar




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