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IK1ZYW Vertical antenna - A vertical antenna for stationary-mobile HF-VHF operation. It works on 2-6-10 and 12 meters band.

PA0NHC 80/40mtrs dipole antenna - Dipole antenna for 80 to 20 mtrs with END-coax feed by PA0NHC

Understanding Standing Wave Ratios SWR - We worry a lot about Standing Wave Ratio (SWR) in amateur radio since SWR is one indication of how well our antenna system is working. Most HF transceivers and antenna tuners have built in SWR meters. SWR is a measure of a transceiver’s output power verses the portion of that power reflected by the antenna system By Ken Larson KJ6RZ

Transmission Lines - Whenever you choose a coax feedline, the frequency of operation is a very important consideration. Over the operating bandwidth of the coax the VSWR is low, typically 1.2:1 or better. Insertion loss is also an important parameter. It is usually specified in dB/foot and is a linear relationship.

SWR: Maximum allowable VSWR - VSWR (voltage-standing-wave-ratio) represents the degree with which an antenna is "matched" to the system impedance. Most modern antennas do not require any tuning for optimum performance. VSWR is one of the easiest parameters to measure and VSWR meters are becoming very popular antenna installation tools

Transmission Lines - Articles on SWR measurements and feed lines tuning.

SWR Calculator - BesserNet Reflectometer is a fun SWR calculator and simulator Java applet

Mobile Helix Antennas for HF - Normal mode helix antennas for HF mobile. Photos andn plan for a 20 meters mobile helix antenna by N2MH

Wireman-J-Poles for 2m-40m  ^{updated  pop} - J-Poles with Wireman-cables for the quarterwave matching section

Antenna Selection Made Easy - This page will help you answer important questions about antenna selection before you talk to a supplier. After reading this paper, you should be able to better determine the most important parameters you need to know for your antenna selection criteria.

10 Meters - European beacons map - Map in png format of european beacons transmitting on 10 meters band by Ari Catanzaro

Six meter beacons - Beacons transmitting on 50Mhz band

Zanesville Amateur Radio Club Priority listing - The Zanesville Amateur Radio Club (ZARC) is an association for the purpose of providing amateur radio communications in times of emergency: installing, maintaining, and operating a 2-meter repeater and club radio shack, and promoting amateur radio in general.

Contest audio file - MP3 file recording a QSOs with SP5CKA and SN7N (SP7PS) in SP DX Contest 2001 on 40m (recorded by SP7PS)

RACOM - Radio modems - RACOM is a Czech company specialized in design and production of radio modems and other devices for wireless data networks for radio channels from 140 to 900 MHz. RACOM radio data networks are suitable for data transfer in telemetry & SCADA applications, transaction networks, security systems, IP networks and firts of all mobile tracking and fleet management.

Counter Surveillance - Field Strength Meter - The zap checker is a counter surveillance, bug detector, field strength meter

Telewave - Telewave's innovative engineering produces the industry's toughest antenna systems. Yagi, Fiberglass Collinear, and Dipole models are available from 66-2500 MHz. Wattmeters, test equipment,rf power meters, duplexers, filters and cavities, transmitters combiners

Maritime stations on 150 meters band - 2 MHz Medium Frequency Maritime Stations in PDF format

Isotron antenna manulas - From this page you can download the following manuals, in Adobe Acrobat format .pdf, 40 Meter Isotron, 80 Meter Isotron

Cables Etc. - Electronic Parts for HAM Radio Operator's and Electronic Hobbists. Amateur radio parts and components. Electronic Parts Distributor accept VISA, DisCover, and MasterCard.

Test & Measurement Equipment Buying Guide - Compare and select Test& Measurement equipment according to its technical parameters; access library of manufacturers specs and data sheets. TestBuyer.com

WEaudio recorder - WEaudio was born as a program to record activity on VLF band, it can records audio file on HD as long as you want within prefixed pauses. It can starts record at the hour you want to monitor.

Phase 3D (AO-40) Decoder - This program demodulates the telemetry data signal transmitted by the AO-40 satellite (aka Phase III-D) using the PC sound card

MMvari - MMVARI is a multi-Mode SoundCard Ham (Amateur) Radio program for receiving and transmitting the RTTY-PSK-FSK-MFSK modes. The program was written to experiment with the efficiency of transmitting Japanese and East Asian languages (HL/BV/BY) using the VARICODE

A 80/40m Direct Conversion HF Receiver with DDS VFO - Juha (OH2NLT) and Matti (OH7SV) have designed JUMA-RX1, an award winning 80/40m direct conversion HF receiver with highly accurate direct digital synthesis VFO. The receiver is very compact, because it constructed using surface mount components. No coils need to be wound to construct this receiver!