RF Receivers

RF Radio Frequency Receiver Circuits Page 4
RF Receivers: #'s A - B C - D E - K L - Q R - S T - U V - Z
Last Updated on: Monday, October 03, 2011 06:08 PM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Experiments with Detector Diodes - When building crystal radios or other simple receivers, the experimenter often wonders about the relative performance of the different diodes in the junk box. Here are the results of several experiments using the typical ….(added 04/05/06)

External Antenna for the GPS-38 Magellan 2000 or Eagle Explorer GPS Receivers - (schematic / circuit added 05/06/07)

FM Transmitter - A compact 2 transistor transmitter for use at VHF frequencies…. [Andy Collison]

Four Band Double Tuned Preselector - The circuit requires an RF input which can be from a longwire or a loop antenna. The Preamplifier has a range from 550kHz (Medium Wave) up to 30 MHz in the SW band. The input Switch S1, applies voltage to a set of relays which switch in the appropriate coils.... [Designed by David Sayles]

Four channel RF remote control - (electronic circuit added 05/06/07)

Frequency Synthesizer - (schematic / circuit added 05/06/07)

Frequency Tripler Using the CA3028 - (electronic circuit added 7/03)

Generic VHF power Amplifier - Electroinic design circuit…. [from Harry Lythall's website]

HamRx - 144-146 MHz synthesized FM receiver (circuit added 08/07/06)

HDT Technology Adds Power to CDMA Chip Set - RF Micro Devices App Note TA0003 (added 02/05)

How to Build a 300MHz AM RF Remote Control System - (electronic circuit added 4/05)

I.F. Amplifier - The I.F. transformer primary has 18 turns, the secondary winding has 4 turns. The capacitors across the IFT primaries are 82pF. The input/output transformer has 12 turns, tapped at 3 turns from ground. This transformer is wound on a ferrite core. The mosfets are 3SK45's. The diodes in the product detector are 1N34's. I use a six pole SSB filter from a scrap CB. The centre frequency is 7.8MHz. The -6db bandwidth is about 2.5KHz. (added 02/05)

ICOM CI-V interface with RS232 RTS to PTT - This page describes my home-built ICOM CI-V interface. In order to connect most all ICOM radios to a computer, an additional interface is required. The interface bridges the gap between the RS-232 electrical levels used by the computer serial port, and the open collector shared bus used by the ICOM radios. The interface, therefore, is not much more than a level converter....(diagram added 05/06/07)

IF Amplifier Circuit - Three of these amplifiers are used in series to build the 455 kHz IF amplifier. AGC voltage comes from the AGC Circuit. The diagram above shows the circuit for the second IF amplifier. (added 02/05)

Improved CMOS RF PLL sythesizer - Electroinic design circuit…. [from Harry Lythall's website]

Kenwood TR-7950 manual & schematics - (diagram added 05/06/07)

RF Receivers: #'s A - B C - D E - K L - Q R - S T - U V - Z