modulation sound files

Quad antenna for 10 and 15 Meters - Building guide for a two element quad antenna planned for 28 and 21 Megahertz

Dual Band Vertical On Autopilot - A good 20 & 40 meter dual band vertical using a novel tuning method that provides automatic band switching.

A better antenna-tuner balun  ^pop - Which balun to use? The hybrid balun promises advantages over both voltage and current baluns by ZS1AN

Antenna here is a Dipole - What is a dipole antenna and why are they so popular ? Arrl PDF file

The Monoband HF dipole antenna - If you are looking for an easy antenna for your favorite band, you can't go wrong with an halfwavelenght dipole, all you need is 3 insulators and some wire

Coax velocity factor - Coax Cables velocity factor article in pdf format

300 Ohm Twin-Lead J-Pole - popular 2-meter emergency antenna that can be found all over the internet and in antenna books.

Why a Beam Antenna - Some basic antenna information for the newcomer

Homebrew your own inductors  ^pop - Can’t find the inductors you need for an antenna, a tuner or amplifier? Build your own—it’s easy! By Robert H. Johns, W3JIP

Coaxial Traps for multiband antennas - A new perspective on the analysis and design of this popular antenna element. By Karl-Otto Müller, DG1MFT

A two element yagi bean - Simple gain antennas for the beginner, a 2 element yagi antenna

A beginner's guide to RTTY contests - A pdf file with review of RTTY contests software available on the net and information on how to operate a RTTY Contest, by RSGB.

Sound samples of digital transmissions - Sound samples of the transmission modes recorded at 11025 samples per second, mono and the message in all of the samples is the same: "the quick brown fox jumps over the lazy dog 1234567890".

KK7UQ - Digital Radio - The KK7UQ computer to radio interface, sound card interfaces, IMD meters interface products

DaimlerChrysler Radio installation guide - Radio communication equipment installation recommendations

IP-Sound  ^pop - IP-Sound is a Free application for audio exchange client to client over a TCP/IPv4 network (Lan/Internet). The main purpose for the existence of IP-Sound is to provide low quality audio 8-16kHz, with low latency for use together with remote control software for "ham" radio amateur equipment. IP-Sound is developed by SM5VXC.

SignalGen - SignalGen is a free (GPL) Linux (Xwindows GUI-based) utility that generates relatively low frequency signals with the use of a PC sound card. It is an entirely suitable replacement for a hardware signal generator if one doesn't require signals of a frequency higher than about 50 KHz. SignalGen creates any frequency between a fraction of one Hertz and an upper limit determined by your sound card's capabilities.

FFT Explorer - A free (GPL) Linux (Xwindows GUI-based) utility that performs spectral analysis on real-time data from a sound card or other source, and can analyze the spectra of various sound file types. It can also accept data from many kinds of applications in plain-text form by way of the "named pipe" feature of Linux

Lan Link for Windows - Lan Link for Windows by G3ZCZ, Internet interface to CXCluster, Controls PK-232, PK-900, PK-88, KAM, KPC-3, MFJ1278, and TNC2, PSK31 via the sound card in the PC, eQSL interface

A diode-switched band-pass filter - High speed silicn diodes work well as RF switches. This article describes how to use diodes for selecting two or more filters ARRL QST article by W1FB

Simple Electronic Keyer - A simple keyer which can be built for as little as $6 with some junk box parts. Although this circuit is not a true iambic keyer, it is capable of producing perfectly sounding CW.

Low-Power Transceiver Kits You Can Build - A Comprehensive roundup of the most popular QRP transceiver kits on the market in recent years in PDF format

RFI - Intermodulation - Getting squeaks and squawks from your H-T? Are pagers crunching your mobile rig's front end? Here's how intermod happens--and how to fight back!

Automotive RFI elimination - ARRL pdf file on how remove car noise from your radio. Modern vehicles are RF noisy environments. Come learn how to identify and silence yor mobile noise sources, by WA6PDP

50MHz-Transverter 10m/6m from DK7ZB - This transverter was built in 1994, a discription in three parts (german language) for DOWNLOAD as PDF-files. Circuit, printed-boards and layouts in the files