direction finding circui

160m-6m Directional Array - Stealth 19 element directional antenna array system for 160m to 6m

W0BTU Beverage Receiving Antenna notes - Comprehensive information page about bi-directional Beverages, including applications, construction details, and tips.

Delta loops for 15 20 and 30 m - Full Wave Delta Loops for 15, 20 and 30m with perimiter dipole, quiet, low TOA, mono-band - a perfect stealth omnidirectional solution

The Sloping Vertical Dipole - The radiating part is the vertical half of the dipole. You get nearly radiation in all directions, the second half must not be in 180°. The table below show how we get an impedance for direct feeding of 50Ohm coax. by DK7ZB

144 MHz Halo Antenna - This halo antenna was built to have an omnidirectional coverage while working in VHF contests.

Discone antenna - The basics of what is a discone antenna for wide band or bandwidth omnidirectional applications.

Rhombic Antennas - Description and simulation of two types of rhombic antennas, using the software 4Nec2: the simple bi-directional and the terminated directional rhombic antenna

Lindenblad Satellite Antenna by KL7UW - Omni-directional circular polarized satellite antenna project by KL7UW

KGD - Reduced size antenna - A reduced size antenna made of two series resonant circuits with a radiant tube condenser in German

The NDB List website - The NDB List is a private group for DXers who are interested in Non Directional Radiobeacons, MF, HF & VHF Propagation Beacons, Cluster Beacons and all kinds of other radiobeacons

APRS and Fox Huntinhg - Using APRS For Direction Finding

VIC ARDF - Victorian Amateur Radio Direction Finding Group

AFR Enterprises - AFR Enterprises a leading distributor of electronic components, semicondustors, diodes, Resistors, Integrated Circuits across the USA.

Transistor PA Biasing - Here is a simple circuit that can deliver the peak base current needed for linear ssb operation

Speech Intelligibility - Articles published by the Radio Society of Great Britain, basic principles, construction of a simple equaliser circuit

Recovering old NICAD and NMHI Cells - Old Nicads batteries and sometimes NMHI batteries usually end up with several cells being short circuit, as they suffer from crystal growth in the electrolyte

Semiconductors - Semiconductors, diodes and transistors, intregrated circuits

Circuit Laws - Basic electronic circuit laws

A high perfomance Crowbar Circuit - The MC3423 can protect sensitive circuity from power supply transients or regulator failure when used with an external "Crowbar" SCR.

DRAKE TR7 Downloads - Circuit diagrams drake tr7, Schaltbilder Drake Tr7, antenna tuners, baluns, and home brew power supplies, dual tone ssb test generator, zweiton ssb test generator, zweiton testgenerator, dual tone test generator by DK4DDS

144 MHz Antenna Pre-Ampilfier - Electronic circuit and components layout fot this VHF Preamp

DRM Demo Receiver - Christoph Petermann DF9CY DRM demonstration receiver project including Circuit Diagram and component list

Bartling RX-40 Receiver - Circuit Diagram and Construction of the Bartling RX-40 Joachim Münch DF4ZS

30 m Band Direct Conversion Receiver - The direct conversion receiver described consists of only a bandpass filter, mixer IC, VFO and audio filter. With only 22 parts, this simple circuit should take a few hours at the weekend to construct.

UHF on a VHF Rig - This circuit enables fair copy of strong 444 MHz signals, off a local repeater, using a 2m rig and a 1/4λ 70 cm indoor ground plane antenna.