4 turn helical antenna for 1280mhz and 1405mhz
Description
dualband helical antenna. Inner holes are for 1405mhz and outer holes are for 1280mhz. Use 1.3mm solid copper wire and a fr4 circute board blank for the reflector. The first 1/4 turn should run perpendicular to the reflector with an 1.8 to 2mm airgap to improve the VSWR of the antenna.
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