antenna circuits Archives - Amplifier Circuit Design https://amplifiercircuit.net/tag/antenna-circuits Amplifier Project Schematic Diagram Fri, 23 Dec 2011 03:35:33 +0000 en-US hourly 1 103688205 Active Antenna for AM/FM/SW https://amplifiercircuit.net/active-antenna-for-amfmsw.html https://amplifiercircuit.net/active-antenna-for-amfmsw.html#respond Thu, 22 Sep 2011 07:03:03 +0000 http://amplifiercircuit.net/?p=540 This simple  AM/FM/SW Active Antenna circuit are able to be used for AM, FM, and Shortwave(SW). For the shortwave band, […]

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]]> Active Antenna for AM/FM/SWThis simple  AM/FM/SW Active Antenna circuit are able to be used for AM, FM, and Shortwave(SW). For the shortwave band, this kind of active antenna is comparable to a 20 to 30 ft wire antenna. It’s in addition designed to be used on receivers which use untuned wire antennas, for example cheap models and car radios.

L1 can be chosen for the application. A 470µH coil works on lower frequencies and lie in Am, for shortwave try a 20µH coil. This AM/FM/SW Active Antenna circuit can be powered by a 9 volt battery pack. If a power supply is used, bypass the power supply using a 0.04µF capacitor to prevent noise pickup. The antenna used on this circuit is a standard 18-inch telescoping type, but a thick piece of copper, bus-bar, or piano wire will also work fine.

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