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The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is used to store the user consent for the cookies in the category "Analytics". These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. general-purpose.N-channel FETĬ6 = 470uF/16-WVDC. If you found the voltage is below 2 V, you must increase R2’s value to 1.5k ohms.įinally, to dip deeper than 100 kHz to the bottom of the RF spectrum, you must increase C1 to 0.002 ♟. Then, the value of R2 triggers the bias for Q2 to around 2 V. You may any RF choke values from 0.5 to 2.5 mH. To attenuate the sound of the power source from reaching the FET (Q1), inductor L1 is introduced. The output of Q2 is coupled directly to the base of Q3 which is configured as an emitter-follower amplifier.įurthermore, Q3 functions to check and isolate the gain stage from receiver side of the RF-input circuitry. This side is preset as a voltage amplifier. The RF signal is directly attached from the Q1’s source terminal to the base of Q2. The antenna signal booster circuit is constructed around a few transistors and supplementing components.ĭue to that, the circuit delivers an RF gain of around 12 to 18 dB from a source of 100 kHz to more than 30 MHz, complementing the schematic in Figure 1. 5%resistorĪ simple antenna signal booster circuit as depicted in Figure 2 will do the trick if your receiver requires a higher level RF-input signal than what the matching network can produce. Q2 = 2N3904, general-purpose, NPN silicon transistor Q1 = MPF102, general-purpose, N-channel FET You may use any type of pull-up antenna after considering the space available for it. What you need to do is to keep all the leads short and practice a neat circuit building plan.
Just simple construction on a breadboard or perfboard with push-pins is more than enough for this circuit. When you contain the antenna signal booster circuit in a metal enclosure and use an internal 9 V battery, you get the best low-noise performance for the matching circuit.Īlternatively, an evenly-filtered noise-free external AC power source can be implemented as well as power supplied from the receiver, if any.
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