![]() When used to receive signal, the integrated amp boosts the RF picked up by the antenna and allows much longer remote cable runs. There is no difference between the antenna element of an active or passive antenna of the same type the only difference is whether an amplifier is included.Īctive antennas can be used for both receiving and transmitting applications, but they are most often seen as receiving antennas. While, passive antennas are antennas that have no amplification stages.Īn active antenna is a passive antenna that simply includes an onboard amplifier. Good luck and having fun! Active Antenna Amplifier NotesĪctive antennas are any antennas with integrated signal amplifiers built right into the unit. The circuit diagram of active antenna amplifier shows the pin configuration of the coils. Coil L2 is similar to L1, but has only three turns. It is tapped at the first turn from ground lead side. Connect the other two wires from the pot into the two outside screw terminals on the amp. Connect the middle wire from the pot to the middle screw terminal on the amp, like so. Input coil L1 consists of 4 turns of 20SWG enamelled copper wire over a 5mm diameter former. It’s the little black thing with three holes in it and three screws on top. ![]() but I have not tried it.Īdjust capacitor trimmers C1 and C2 for maximum gain. There are a couple other models that probably would work too, like the NTE107, 2SC2570, etc. The circuit is configured as a common-emitter tuned RF pre-amplifier wired around VHF/UHF transistor MFE201. This amplifier will pull in all distant FM stations clearly. The circuit works with only 1 UHF/VHF type transistor, MFE201. With only a small handfull of parts you can built this trusty FM Amplifier to boost the signal from the radio transmitter. An electrically tunable radio frequency (RF) amplifier includes a resonant circuit having a voltage variable capacitance as one of its elements. ![]() This is the circuit diagram of active antenna amplifier for FM radio device.
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