RF Amplifier | Electronic Project Circuits

Posts Tagged ‘RF amplifier’

HF 300KHz-30Mhz Linear Amplifier

This is a rather unusual QRP Power Amplifier design, with a wide frequency response; within three dB’s from 300KHz to 30MHz. Overall gain is in the region of 16dB and the final output power may be well over four watts. This PA will deliver 4 watts continuously (with a suitable heatsink), and may be loaded into a short-circuit or open circuit without causing damage. This makes it almost the ideal PA for outdoor/field use. Above is the full circuit diagram of the RFPA and the coil winding pattern. This PA may be used for for SSB, [...]
Read more source:

http://w1.859.telia.com/~u85920178/tx/linear.htm

Be the first to comment - What do you think? Posted by admin - July 8, 2009 at 7:12 am

Categories: Power Amplifier, RF-Radio Frequency Tags: HF amplifier, linear amplifier, RF amplifier

1W Linear FM Booster by 2N4427

That RF Amplifier is for boosting small fm transmiters and bugs. It use two Philips 2N4427 and its power is about 1Watt. At the output you can drive any linear with BGY133 or BLY87 and so on. Its power supply has to give 500mA current at 12 Volts. More voltage can boost the distance but the transistors will be burned much earlier than usual.! In any case do not exceed the 15Volts. The Amp offers 15 dB in the area of 80Mhz to 110 Mhz. L4, L5, and L6 are 5mm diameter air coils, 8 turns, with wire 1mm wire diameter.An easy project, with great results.

Be the first to comment - What do you think? Posted by admin - November 4, 2008 at 7:22 am

Categories: Power Amplifier, RF-Radio Frequency Tags: FM amplifier, RF amplifier

AM/FM/SW Active Antenna by MPF102

This circuit shows an active antenna that can be used for AM, FM, and shortwave (SW). On the shortwave band this active antenna is comparable to a 20 to 30 foot wire antenna. This circuit is designed to be used on receivers that use untuned wire antennas, such as inexpensive units and car radios….

Read More Source:http://web-ee.com/schematics/RF_circuits/am-fm-sw-active-antenna/
Thank you.

Source: “Popular Electronics” Magazine, Jul,89 issue. (C)Copyright Gernsback Publications,Inc., 1989 – Please read their disclaimers before implementing this circuit.