simple 4:1 balun

A 5 element beam for 10 meter band - Here is a very simple 5 element covering the entire 10 meter band (28.000-29.700) with a swr of less than 1.4 at the band edges

Morgain Antenna for 40/80 - Simple and cheap antenna for 40/80 meter band

Homebrew Balun Case - Balun case construction, tipically to host toroid cores. Size of case depends on power to handle. By DL5DBM

Balun construction  ^pop - PDF files describing how to homebrew a 1:2.5 balun

High impedance baluns - Introduction with some background on balun types

A 1:1 Coaxial Balun  ^pop - PDF article on a coaxial 1:1 balun by I0QM

Build a 4:1 Guanella Balun - Step-By-Step Construction of a 4:1 Current-Type Guanella Balun by W1CG

A model of a practical Ruthroff 1:4 balun - The 1:4 balun is of particular interest because it underlies many other configurations, and understanding it helps towards understanding the other Ruthroff balun configurations.

The DK7ZB-Match for Yagis - Simple, easy to built match developed in 1995 for Yagis with resistitive loads of 12.5, 18 and 28 Ohm.

Transmission Lines - About feed lines, parallel lines and coaxial lines, notes on impedance, SWR, Baluns, velocity factor and more by NZART

G5RV Antenna Homebrew - Homebrew G5RV a simple multiband antenna by 9M2ZAK

Simple Dipole Antenna for 2m - A simple portable dipole antenna for 144MHz

DK7ZB 144 mhz Yagis - High gain, good pattern and acceptable bandwidth. These aims can be realized with a radiation-resistance of 25-35Ohms, because the 28-Ohm-feedpoint is very simple to match.

43.33 Km LOS with USB WiFi stick  ^{updated  pop} - Simple USB 802.11b WiFi adapter with original antenna test by adam 9A4QV.

DXCal DX Calendar - This is DXCal - a DX Calendar. The idea is quite simple, DXCal is a calendar where hams can adds all the DX events that are planned.

Amidon Baluns - HF baluns by amidon.de with online shop

Amidon Inc. - Ferrite Toroids. Iron Powder Toroids. Ferrite Beads. Split Cores. Cable clamp-ons. Balun Cores. W2FMI Baluns and Ununs. Inductive components for EMI Suppression and RFI Suppresion, power supplies, HAM radio.

Yogi Electronics - Yogi Electronics provides DTMF Control Simplex Repeater board.

MacTNC - MacTNC is simple, configurable terminal software used by amateur (ham) radio operators to control a TNC (terminal node controller). MacTNC performs most of the same functions of other terminal software, but includes buttons for standard commands, and allows the user to configure additional buttons for special purposes. MacTNC works only user Mac OS X because it relies on Unix components of the current operating system.

GOLog Contest Logger for Palm OS - GOLog is a contest logger for Palm OS and was written with the QRP field contester in mind. GOLog is small (about 48K) and simple and should run on any handheld computer running Palm OS version 3.0 or newer.

IC746 control - IC-746 control It’s as simple as point and click. Left click will turn counter clockwise, and right click will turn clockwise.

Callsign Lookup - Callsign Lookup is a simple, small Apple Macintosh application that allows the amateur radio operator with a dedicated Internet connection (DSL, cable) to quickly access online callsign databases

A simple VOX circuit - Here is a 3 transistors 6 diodes circuit that is a Voice Operated Tx PTT control as well as an ANTI VOX circuit to stop mis-operation from Rx noise by G8MNY

Homebrew FT 817 Headset - A simple circuit to homebrew your own headset for the Yaesu FT-817

CW Filter - I0QM Gaussian CW Filter page This Filter for the weak signals is the evolution of the simple Universal State filter, already published on "Radio Rivista", the 8/1993