i want to interface a gps module and an antenna. I found this kind of antenna (example) It does not mention its type.
Is this an active or a passive antenna? How to be able to know by myself without the need of asking here?
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In answer to your "How is this possible" question: The RF signal and DC power are both on the center conductor of the cable. At the receiver the RF is blocked from the receiver's power input with a choke, and the DC power is blocked from the signal input with a capacitor.