modulation sound files

The ground image vertical antenna - A 20 meter quarter wave vertical antenna by jerry sevick W2FMI QST Article

A Q&D Multiband Antenna - A brick, some PVC tubing and a few other common hardware store items can be transformed into an effective Quick & Dirty RF-launcher—for less than $25! By Michael Atlas, N7FC

An Examination of the Gamma Match - W3PG working analysis of the gamma match problem taht gives useful practical results

The Sweepsteaks Handbook - Mad River Radio Club Sweepsteaks Handbook A PDF handbook for midwest SS contesters

Amateur Radio Country Files - This web site represents the home of "Country Files", databases of entities (countries), prefixes and callsigns that are used by amateur radio logging software. There are three "flavors" of country files: CTY.DAT used by contest logging software such as CT, N1MM, NA, TR and Writelog DX4WIN.CTY used by the DX4WIN logging software WPXLOC.DAT used by packet cluster software such as AR-Cluster, CC Cluster and DX Spider maintained by Jim Reisert, AD1C

The Anorak Files - A blog about ham radio. A blog dedicated to cool stuff like ham radio, birdwatching and bus timetables

Ham Radio Video and Sound clips - KB7TBT amateur radio video clips and sound clips collections

Lashen Electronics - From connectivity for the home or small office and home theater cabling solutions to power management and protection as well as home and office sound and video solutions, lashen electronics has the tools and technology you need to do the job right.

TenCom - Tencom, located near Toledo, Ohio is dedicated to the pultrusion of fiberglass composite products. This includes solid rods, conductor rods, tubes and a variety of custom profiles.

Russian VHF Trophy - For carrying out of bilateral QSOs on band of 2 meters, 70 and 23 centimeters all kinds of modulation. It is authorized to spend QSOs, using all kinds of passage: TROPO, ES, AURORA, MS, FAI, EME, IONO,

Sights and Sounds of Digital Signals - Preview the waterfall signature of various digital signals and listen to the sound of the digital modes. Learn about the bandwidth requirements and why a linear transmitter path is critical to successful and correct use of many modes on the amateur bands by W1HKJ

How to make an APRS IGATE - How to make an APRS IGATE using Linux, soundmodem and aprx by HA2NON

PSK31 Interfacing - PSK31 basics and radio to pc soundcard interface circuits, radio to soundcard, soundcard to radio and pc serial port to radio

Phase Noise. - This is perhaps the most important parameter in many oscillators and it deserves an in-depth discussion on what it is, how it affects a system and how it can be minimised in an oscillator design.

NDBfinder - NDBfinder allows you to use your PC and soundcard to receive, detect, identify and log NDBs (Non Directional Beacons used for maritime and aeronautical navigation)

Super Check Partial Database Files - Databases of contesters call-sign to be used with logging software The dta files can be used with CT, WriteLog, TRlog, SD, N1MM Logger, NA, Win-Test, and others

THROB 2.5x3.3 - Freeware Experimental-Program 9-Tone-MFSK with sound card

RSCW - RSCW is a Linux/Unix program for decoding morse signals using the computer's sound card. It has been written/optimized for digging weak signals out of the noise.

DBFToAdif - Freeware , 3.8 MB executable that allows the conversion of some old DBF log files (DXLog, EasyLog, LogPlus, TopLog, TurboLog TotalHAM92) to the ADIF Format by TRX-Manager authors

Sine Wave Generator - Freeware windows Wave Generator use the sound card's output as sine wave output. A built in sweep algorithm is used by audio hackers to measure frequency repsonses of their amplifiers

Freakin’ Beacon Setup Program - A small program to simplify changing messages in the Expanded Spectrum Systems Freakin' Beacon controller. The program makes it easy to modify an existing message or to have multiple messages available in different files ready to program into the beacon controller.

JQAM (QAM modem) - Transmit audio/video, UDP packets, http, rs232, with QAM using the soundcard rates up to 100kb/s.

Second-Harmonic-Optimized Low-Pass Filters - Sometimes we need a little more output filtering than traditional designs offer. Look at a new filter that can give you that extra boost. QST article by W3NQN

PSK31 Interface - Fairly simple way to interface a computer soundcard to an HF rig to operate PSK31. This interface also works for SSTV & RTTY, and has been tested with a Kenwood TS-140.

A no-tune transverter for 2304 Mhz - By Jim Davey WA8NLC