direction finding circui

160m Band 5 Element delta loop - The goal for this antenna project is to determine what sort of gain and radiation angle is possible on 160m using 5 delta loops with a max height of just 14m

Guanella 4:1 balun - This article reviews the proposition that a 4:1 current balun in the style of Guanella can be constructed with both pairs of windings sharing a common magnetic circuit.

Modern Beverage Receiving Antenna - A helpful guide to building your own beverage-type low noise receiving antenna for broadband use. Easy, do-it-yourself suggestions to optimize directional performance, even if you lack a farm to put it on.

Alford slot antenna, SM6PGP - The slotted cylinder antenna, Alford Slot, was first introduced by Andrew Alford in 1946. Its an omnidirectional horizontally polarized antenna.

144MHz omnidirectional antenna - A full wave 2-meter VHF omnidirectional antenna by ON6MU

CantennaCalc - Kioan's calculator for building a Cantenna , directional waveguide antenna for long-range Wi-Fi

Vintrage Radio - alive and well - Presentation about finding, restoring, updating and operating vintage Ham Radio by K4QKY and Bill Call, KJ4W

VU2UKR HAM Radio Station - HAM Radio India Yagi Beam CW QRP SSB QUAD DX circuits sound card Transceiver Morse HF VHF Antenna Satellites Amateur Club Station Operators Licence Exam ASOC Guide Digital Mode Equipment Transmitter Experiments Project schematics Beacon dx HAMSAT VUSAT Satellite Emergency communication Information Homebrew QRP Kits

ROLCON RF Systems - High quality VHF/UHF Yagi (directional) antennas

Verdant - Designer and manufacture of Airborne Antenna & Radomes covering a range of applications. Products include vhf antenna ,uhf antenna,navigation antenna,comm antenna,blade antenna,vor/ils antenna ,L band antenna, direction finding antenna,DF antenna,vor,ils, IFF antenna on aircraft,aircraft antenna for airborne application.

Advanced Linear Devices - Electronic compoenents manufacturer of precision CMOS analog integrated circuits for OEMs of industrial controls, computers, instrumentation, automotive, and telecom. Transistor mosfet.

RDF Products - Mobile and Fixed-Site Radio Direction Finders

Kenwood TS-50 IF-10D interface - Circuit of the Kenwood IF-10D interface for the TS-50 transceiver.

IC-Prog Prototype Programmer - PIC Programmer software package that allows you to program all types of serial programmable Integrated Circuits using Windows 95/98/NT/2000/ME/XP

Increasing Amplifier Relay Speed - Article describes a circuit that accelerates the coil of DC relays by momentarily doubling their voltage.

Transistor Audio Preamplifier Circuits - Design Guidelines for Bipolar Transistor Audio Preamplifier Circuits By Mike Martell N1HFX

VersaBeacon Project - The VersaBeacon is a frequency agile, modulation agile RF source using a DDS chip and minimal support circuitry. It covers a frequency span of 1MHz to 150MHz in 1 Hz steps and provides a variety of modulations

Resonant Frequency Calculator - This web based application will compute circuit values required for an L-C circuit to resonate at given frequency. Also it will compute the resonant frequency if given values for L and C.

Frequency Counter project  ^updated - Circuit and construction instruction designed by Mani VU2ITI

M3 Electronix Semiconductor Analyzer Kit - A workbench instrument capable of testing transistors, diodes, FETs, usefull constructing QRP circuitry.

QRP AM CW transmitter - A simple low-power broadcast-type circuit, using a crystal oscillator integrated circuit and an a collector modulated AM oscillator

CAT programming interface for ICOM rigs - This simple and cost effective interface circuit is designed for use with any ICOM amateur radio equipment with CIV interface

Kenwood-to-PC Serial Interface - A circuit that connects an IBM® compatible personal computer, running TR Log or CT (etc.) contest logging software, and Kenwood transceivers equipped with serial control ports. CW keying is also provided in this RFI filtered interface unit.

NB6M 10 Homebrew Receiver and Keying - Schematic of a homebrew receiver and keying

G3TXQ SWR meter - Based on the N2PK design, this swr meter use a stockton directional coupler