free sdr

A Bird Yagi Antenna - Pictures and detail of contruction of a bird yagi for 10 meters and pictures of the 6 meters version

A dual band wire beam for 17 and 12 meters - This wire beam Moxon antenna offers double duty on 17 and 12 meters with one 50 Ω feed line by Allen Baker, KG4JJH

The Beverage Antennas - Beverage antenna description for long wave reception, article published on Megahertz magazine in November 1900, in french

Dipole Calculation - Determining your proper length for the open half-wave dipole antenna

T2FD antenna - A T2FD antenna for 10-15-20 meters band

Hombrew 23 cm antennas - Homebrewing antennas for 23 cms

My Retro Radios - Collection of old radios for sale

SCR-Log - Scr-log freeware logging program for mac, windows, linux and dos. designed for school, club, and individual class stations to use during school club roundup.

HamLog.eu - This online database, called HAMLOG, can be used free of charge by any radio amateur worldwide.

Trusted QSL - The mission of the Trusted QSL Group is to keep eQSL an open and free activity for amateur radio operators by promoting the Digital Signature Standard (DSS).

Digital mode club (DMC) - Digital Modes Club(DMC) is for all licensed HAM operators and SWL's who likes the digital modes. It's free lifetime membership.

Digital QSO Club - The Digital QSO Amateur Radio Club DQSO is an informal club of amateur radio operators active use digital modes on all bands. Membership is free for any licensed radio amateurs.

Position-Report APRS maps - APRS-Webserver, that presents aprs-data and maps for free using Google Maps api. The position data is imported from aprs.org, winlink.org and echolink.org. The map data are partially commercial and free. This server is for amateur radio purposes only.

160 meters by Wikipedia - From Wikipedia, the free encyclopedia, description of the 160 meters band

Achims Free Radio Desaster Priority listing - European free radio on shortwave and mediumwave.

AutoRec - AutoRec is windows freeware time based automatic recorder - player for radio broadcast. Auto Recorder will record or play wav audio files, and execute batch or other executable application programs at scheduled times. The primary use for Auto Recorder is automatic, unattended recording and playback of network or other satellite-delivered radio station program material.

ExpressPCB - Free PCB software is a snap to learn and use. For the first time, designing circuit boards is simple for the beginner and efficient for the professional.

Linrad - Multiplatoform freeware DSP software. Linrad has its origin in software that was developed for 144 MHz EME CW but it is quite general and should be seen more like a kit for designing a receiver that a receiver for some particular usage. It can be used as a CW receiver with a small time delay and a fast waterfall graph. A dsp for conventional receiver to imporve signals readability, a spectrum analyzer.

SlowFeld XP - Free windows program by G3PPT that permits RTX of FeldHell

Grig Radio Control - Grig is a freeware simple Ham Radio control (CAT) program based on the Ham Radio Control Libraries (Hamlib). It is intended to be highly generic presenting the user to the same graphical user interface regardless of which radio is being controlled. Grig supports the most commonly used CAT commands that are implemented by Hamlib, and integrates well with other ham radio programs like Xlog and gMFSK. Grig has been developed on Linux, but has been ported on Mac and Windows OS.

Mini logbook - A neat free little tool to log your contacts. It automatically looks up previous contacts with recent call. Select text in MRP40 Rx- window. Auto insert that text into MiniLog via double click. By Polar Electric

Fldigi - Freeware Digital modem program for Linux, Free-BSD, OS X, Windows XP, W2K, and Vista. Support several modes and is fully multi platform application by W1HKJ

KWRTTY - Freeware RTTY windows decoding program in German by DGØKW, Klaus

DXCat - DXCAT is a shareware program dedicated to the Yaesu FT900. It is a CAT system computer control program which enables you to have a total control on your transceiver. by F6GQK

QuickMix - Freeware windows program that allows you to store configuration of your audio mixer in a settings file, and to restore the mixer to that state whenever you want. Useful for digital mode operations where different dsp programs may require different audio in and out settings.