20 meter

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.

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

A Magnetic Loop antenna for 7-21 mhz - If you find external wire antennas obtrusive for amateur radio or short wave listening, then this is the antenna for you, is just 1 meter diameter

Travel loop antennas Priority listing - PA11019 Travel loop antennas, these antennas cover 6.300 to 29.200 mHz , handle 35 Watts and have a packing size of 43 cm, ideal for fieldwork, or mobile operations.

Quad and ModQuad Antenna - Some thoughts on a "hardware-store special" 2-meter quad, and a modified quad for 2 or 10 meters by K3MT

DXIOTA Freeband IOTA info - Iota Website for 11 meters freebanders

miLog - Highly integrated Logging, DXing, Contesting and Station Control Software, commercial version, run under windows 2000 or higher.

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

10 Years of Contests and QSLs - K5ZD article on contesting and qsling, originally appeared in the Scuttlebutt, newsletter of the Yankee Clipper Contest Club, March 2003

GJ - Jersey Shack rental - Shack rental terms, The shack is available on a first-come first-served basis. Confirmed reservations will be filled first

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

Freeband EQSO Server Priority listing - Eqso server for eleven meter freebanders. Only freebanders are allowed by this eqso server, based in spain

How operate Meteor Scatter - The Meteor Scatter tips and tricks described here are based upon more than 20 years of active MS operation

Topband - 160 meter Radio Propagation - Here you will find a variety of tools which will hopefully help you improve your chances of succeeding at Topband (160 meter) DX.

SB-220 / 200 Amplifier with Solid-State Transceivers - Using Solid-State Transceivers With Older Tube Amplifiers, some Hines and Kinks on the Heath SB-220/200 that can be useful in your application

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

WD6CNF DSP Filter - Audio Digital Filter, two bandpass filters, three notch filters, two noise filters graphical setting of filter center frequency and bandwidth Drag vertical lines on top of signal, Microphone input, speaker output Mono, 5 kHz bandwidth

CW Decoder - Decode and trasmit morse code, 5 to 50 wpm ,keep hands on the keyboard, mouse free transmit/receive operation.

Packet Terminal Interface - Simple Windows based TNC interface program Designed for ARES operation, simple operator interface to connect and perform communication functions, control operator programs screens before operations Both receive and transmit screens Simple Windows based TNC interface program Designed for ARES operation Simple operator interface to connect and perform communication functions Control operator programs screens before operations Both receive and transmit screens

FTBCAT Cat radio control software  ^pop - Free CAT control software for Yaesu FT-100, FT-100D, FT-817, FT-817ND, FT-847, FT-857, FT-857D, FT-897, FT-897D, FT-920, FT-1000MP Mark V, VR-5000 and FRG-100 transceivers.

DNBTV - This experimental software will send pictures or slow video directly from your webcam through your soundcard. you will need a webcam capable of 160*120 24bit RGB.

SpectraScope - SpectraScope is a simple Windows interface program allowing your computer to view up to two audio waveforms in either the time or frequency domain. The program is a Windows soft panel operating as a dual channel oscilloscope and spectrum analyzer. The useful frequency of operation is 20 to 10,000 Hz in the time domain and 20 to 20,000 Hz in the frequency domain. The program uses the computer sound card to capture the audio input.

WD6CNF Voice keyer - Audio voice keyer Microphone input, speaker output Live microphone enable Record/play audio from twelve memories Display text of recorded audio Transmitter keyed via serial (com) port Loop (with variable delay) audio output

Audio spectrum analyzer  ^pop - Analyzes audio from 10 Hz to 20 kHz, input from microphone or wave file, Variable sample rates (8000 Hz, 11025 Hz, 22050 Hz, 44100 Hz) Variable transform sizes (1k, 2k, 4k, 8k) Upper and lower limits adjustable Continuous, averaged, peak hold