data transmission

Petlowany Three-Band Burner Antenna - The Petlowany Three-Band Burner is a simple, low-cost, trapless short vertical antenna which amazingly works on three HF bands (20, 15 and 10 meters). This web page contains pictures, performance data, and enough construction details so you can homebrew your own.

80m Loop EZNEC Analysis - Antenna data, and design note for this horizontal loop antenna resonating on 80 Meters by K0ZE

Indoor multiband dipole - This indoor dipole is available in two version for 20-10 meters and 40-10 meters. EZNEC data files available by HB9MTN

Where Does the Power Go - An Energy Analysis at an Impedance Discontinuity in an RF Transmission Line

Exploring the secrets of the Smith chart - If you're a Radio Engineer wannabee, you need to understand transmission lines. It's impossible to really understand transmitters and antennas without understanding lines. Using the Smith chart is far easier than really understanding the math by Chris Scott and associates

How to build the K9AY loop - This document provided by AT technologies explains how to build the K9AY loop receiving antenna.

Antennas and transmission lines - A very exaustive article on antennas and transmission lines. Covers many aspects of antennas and feed lines, in spanish

Putting a Balun and a Tuner Together - Two wire transmission line as a three terminal Device , The W2DU and W7EL models of a choke balun, The effectiveness of a balun. Article by Kevin Schmidt, W9CF

National Radio Data - Call Signs database. - At national Radio Data you can search for more than 838,000 United States and 55,000 Canadian ham radio Call Signs and related information.

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

DX base from UA9LP - QSL managers - The database on DX to stations and their qsl managers, and also addresses of the managers and addresses of some DX-stations, which one work without the manager.

Monaro NSW / Canberra Live scanner - VHF/UHF Scan from Monaro NSW and Canberra (ACT). Stream/Feed contains text-tags with frequency, which is displayed in your media-player as title/Meta-data. Recommended that you use Winamp.

Rajessh Eng. The Tower Company - Rajessh Engineers is a general Purpose designing, fabricating, and commissioning of communication towers, transmission towers, sub-station structures and their accessories. Rajessh Engineers located at IT Highway, Sholinganallur, Chennai, Tamil Nadu, India. Rajessh Engineers is an engineering steel fabricating company to meet the highly specialized needs of the communication, power industry.

BandPlans.com - Have you ever wondered where different modes should be operated, what frequencies to avoid as a courtesy like SSTV etc? This site offer a database for known net frequencies,known segments for different modes, known beacons

The Baudot Code - Table that represents programmer's quick reference to the Baudot character set.

Repeaters database on Google Maps - Interesting google map and repeater database integration that let you search, display and also edit repeaters and relative coverage using google maps api by K5EHX

Last 30 Days Solar Data - Display a table of last 30 days sunspots reports. Prepared by the U.S. Dept. of Commerce, NOAA, Space Environment Center

Kenwood/Trio - TS-850S - RigPix Database picture of the TS-850

RigPix Database - Yaesu - FT-847 - Picture and specifications of the Yaesu FT-847

TLDetails - Transmission Line Details. This utility program shows the impedance and SWR at both ends of a transmission line and the details of power loss in the line. It includes characteristics for over 40 built-in line types. You can modify these values to see how small changes affect the results or to specify custom lines. All program inputs may be changed directly or you can use spin buttons to make the changes. If you are using a moderately fast computer you can hold down a spinner and "watch the movie" on the charts as the results are recomputed. By AC6LA

Zplots - Excel application that allows you to plot impedance and related data obtained from a variety of sources. You can plot on both an XY chart and a Smith chart as well as view the data in tabular format by AC6LA

DTMF decoder - A very easy to use program to decode DTMF dial tones found on telephone lines with touch tone phones. The DTMF Decoder is also used for receiving data transmissions over the air in amateur radio frequency bands.

Fcc Lookup System - The FCC Lookup System software uses the standard FCC data files in an advanced lookup system for matching a call sign to a user. The software creates index files to allow rapid searches without modifying the FCC data file. Available for both Windows and Linux.

Coax cable data - Characteristics of commonly used transmission lines

Common Coax Data - A table summarizing common coax cables features