circuit board layout

40m & 80m portable wire antenna - G8ODE antenna project, where the 40m & Short 80m antenna was deployed as a sloping wire antenna using the 10M fibre glass fishing pole and a hook on the house's gutter-board

WB2HOL Foxhunting beam - Building the WB2HOL foxhunting beam antenna

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

QRZ.com Sked - QSO Scheduling - QRZ.com forum board dedicated to Sked, QSO Skeduling.

Which digital mode for keyboard QSO - Which digital mode should I be using for keyboard to keyboard QSOs?

ATV 432 MHz transmitter - ATV 432 MHz AM transmitter schematic

2M Programmable Fox-Or Transmitter - The 2 metre fox-or transmitter is a small low power transmitter which mounts in a small plasic pipe and runs off two AA batteries. The board measures just 12mm by 70mm.

ICOM IC-746 PRO Interface - If you want to interface the IC-746 Pro or any other Icom rig with a computer for rig control, an outboard CI-V CAT device is required.

VFO Sync board for Yaesu FT1000MP - VFO Sync board for Yaesu FT1000MP Mark V Field, Enhance your listening experience with help of a small stealth control board

FT-817 DC Circuit Protection - A schematic for a DX circuit protection for the Yaesu FT-817, provides protection from the external power supply overvoltage by DL2LTO in german

Mini Circuits - RF / IF Microwave components DC to 20 GHz

Repeater Range Android App - M3OYQ’s Repeater Range is a free application designed to run on the Android mobile phone platform. The the app listens to the onboard GPS and displays the bundled repeater database as a simple list sorted by the range.

CwType - The terminal program for CW-operators. You can transmit both from the keyboard and from a paddle connected to game or LPT ports. You can also operate in paddle iambic mode. Control of the transceiver (PTT and CW keying) is made through one of the COM or LPT ports. CwType can integrate with AALog software

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

PCB with kitchen appliances - Cheap and relatively easy way of making professional quality printed circuit boards at home

Low cost frequency counter - Low cost multifunctional seven digit LCD frequency counter, for your HAM radio shack

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

A simple iambic keyer - Iambic keyer with simple paddles and simple electronic circuit.

Digital Wattmeter - 300nW to 30W - The digital wattmeter project was created for the purpose of measuring power in the range of 300nw to 30w.

KD1JV Digital SWR / Power Meter - This small, light weight digital SWR and power meter uses an Atmel AVR Butterfly demo board and a Stockton type directional coupler.

Signal Source for AO40 mode S - Signal source circuit for 2.4 GHz by sv1bsx

TenTec Omni VI AGC modification - Modification leaves nearly all of the existing Omni agc circuitry intact, simply add an audio detector which modifies the delay characteristics of the original system by G3IXQ

Regenerative circuit - Wikipedia page about regenerative circuits in designing receivers.

A Bipolar Regenerative Receiver - Contrary to what some radio experimenters think, a bipolar regenerative design can be made to work efficiently

The Modern Armstrong Regenerative Receiver - Ramon Vargas Patron articel on regenerative receiver project