This antenna booster circuit can be used to amplify the weak signal received by the antenna. Antenna for AM/FM is usually not tuned for the optimal dimension of 1/4 wavelength, since we prefer small portable size. This untuned antenna has very low gain, so the antenna booster circuit here is very helpful in getting better signal reception. Here is the schematic diagram of the circuit:
Use around 470uH coil for L1 if you use for AM frequency (700kHz-1.5MHz) and use around 20uH for SW or FM receiver. For short wave performance, using this antenna booster, you’ll get a strong signal as we get from a 20-30 feet antenna, with only a standard 18″ telescopic antenna and this booster circuit. The power supply should be bypassed by a 47nF capacitor to ground, at a point that should be chosen as close as possible to L1.
Possibly Related Articles:
- UHF Antenna Booster
UHF antenna booster can be used for better reception, especially when you’re far from TV station / relay transmitter. This UHF antenna booster works in 400-850 MHz range. Here is... - Active Antenna With Gain (Booster)
This is an active antenna circuit with gain. This circuit is used to bost the signal. This circuit is made from a few transistors and other components. This circuit can... - VHF-UHF Antenna Amplifier (Booster) 40-500MHz
This amplifier has VHF (very high frequency) and UHF (ultra high frequency) response, you can use it for receiver booster for example. Here is the schematic diagram of the circuit:... - How to Pre-Tune a Ham Radio Antenna – Video Tutorial
This is video about how to pretune a ham radio antenna. This video shows how to tune a ham radio. In this video, the antenna is tuned to make sure... - Stereo VU Booster Circuit using Transistors
This is a Stereo VU Booster circuit. In this circuit, shown in the schematic diagram, transistor FCS9014 is used. Actually you can use almost any type of small signal NPN...
| 
