aprs point

The Cycloid Collinear, a CP Omni - This paper describes a wide band, high gain, multi-element cp omni with a single 50 ohm feedpoint with instructions for building a 2 and half element cycloid collinear for 2 meters.

Antenna wire catenary calculator - This is a simple calculator for solving the antenna wire catenary between to end points given the design wind speed, mass per unit length of the wire, wire diameter and Gross Breaking Strength of the wire.

The Merits of Open Wire lines - This article is devoted to pointing out the advantages of open wire lines and discussing a few particular applications where they might be the preferred choice to feed the antenna.

Some plain facts about multiband vertical antennas - There is considerable confusion as to what exactly a multiband vertical antenna is. The confusion concerns the method of feed, how much mismatch one can expect, how many radials are required, how the particular antenna is built for multiband use, plus some other points.

Sensitivity of Multi Turn Receiving Loops - Magnetism is manifested as a 'field of vectors', that is, any point in the magnetic field has not only a magnitude, but a direction in space. The four Maxwell equations describe how electric and magnetic vector fields behave and interact.

Getting started in contest - A PowerPoint presentation by Bruce Draper, AA5B on how to get started in contesting

The Nechako Radio Club - The Nechako Radio Club was formed in the summer of '93 to provide a common meeting point for the local area amateur radio operators.

NI4CE West Central Florida Group, Inc - Founded in 2001 to manage and operate West Central Florida's only regional linked amateur radio repeater system. Currently, the NI4CE Repeater System operates nine repeaters from five sites with more on the way. NI4CE covers all or parts of twelve counties in West Central Florida and provides mobile coverage along the areas I-75 and the I-4 corridors.

D-Star presentation and sounds - A powerpoint presentation of the D-STAR operating mode by K7VE includes d-star sound samples

HB9FX Internet Remote Base JN37XH Hochwacht Zofingen Switzerland - Tune and / or listen between 10kHz - 10GHz to professional Online-Receivers as Rhode & Schwarz EK070 or AEG E1900/3, Amateur-Radio-Transceivers, Web-SDR, Digital-Modes, Repeaters, EchoLink, APRS or control Antenna-Switch-Matrix, Antenna-Tuner, SWR & PWR- Control or Web-Cams.

MicroWeather - An APRS-compatible Ham Radio Weather Station

QTH locator or Map square with Google Maps - Based on Google Maps displays corresponding QTH grid square or helps to find one by pointing on the map.

PlentiPeppa.com APRS Web server and live streaming web cams - All about my hobbies, Ham Radio, Automatic Packet Reporting System and my live streaming web cams and much more!

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

Google Maps APRS Priority listing - APRS web map with weather, telemetry, messaging and a bulletin board. Google Maps and Google Earth views update automatically in real time. 14 languages.

G0HWC Essex APRS Infomation - Local APRS info & Tracking

D-Star Query - DStarQuery was written to provide a universal query mechanism for Icom D-STAR enabled radios with a low speed port.

Yaesu VX-2R Quick Reference Card - A downloadable free quick reference card for the Yaesu VX-2R in powerpoint and PDF file ready to be printed.

APRS/CE Pocket PC Ham radio APRS - APRS/CE is a richly featured APRS software package for WindowsCE and especially the PocketPC, Maps are plentiful as it works with DOSAPRS, PocketAPRS (for the Palm) and MacAPRS maps offering an exceptionally compact APRS installation.

D-PRS - D-PRS converts these position reports from remote D-STAR radios to an APRS format. Windows .net application

USAPhotoMaps - Free Windows APRS Client with capability of downloading free aerial photo and topo map data.

3 EL Quad Designer - This DOS program will figure the wire sizes for a 3 element quad and will also give you the distance from the center of the boom to drill your holes for mounting the wire on the spider. it also gives you the length of the 4 quarter wave lengths of wire in case you would like to figure the spreader drill points yourself.

D-PRS Interface - D-PRS Interface is written to provide a universal interface between APRS clients and an Icom D-STAR enabled radio with a low speed port.

NBEMS - The Narrow Band Emergency Messaging System (NBEMS) for Windows is a suite of software programs designed for point-to-point, fast, error-free, emergency messaging up to or over 100 miles distant, and takes up a very minimum of frequency space on the ham bands, leaving more space for other ham activites.

Beam DX - BEAM_DX is a free software for radioamateurs or radio listeners usage. It allows to point a directionnal antenna towards an azimuth, a locator, an international prefix or any other geographical position on earth predefined by its latitude and its longitude by F1ORL