rf hop calculator

RFI Archives - RFI mailing list at contesting.com

Des Moines IOWA Police

Blackford County, Indiana Live Scanner feed - Blackford and surrounding counties Police, Fire, EMS, and EMA.

ARTRA QRP Kits - Lots of homebrew kits, you can buy kits or download as free, Association des Réalisation et Techniques RadioAmateurs. Transceivers, filters, converters, frequency meters, antenna analyzers, ATV receivers, interfaces

PROCOM Antennas - Manufacturer of communications antennas, bandpass filters, RF combiners, receiver multicouplers, diplexers, duplexers, RF connectors, RF circulators, RF isolators, RF couplers and SWR meters

Gizmotchy Antennas - The Charles Gizmotchy high performance horizontal and vertical beam antennas. Two, Six, Ten and eleven meters antennas

QRP LABS - The QRPLABS series of single band QRP CW tranceiver kits are high performance CW tranceivers with easy operating features, small size and light weight.

WEFAX - Weather and Amateur Facsimile - arrl wefax pages with members only articles such as FAX480 and SSTV Interfaces and Software, contains also a few links to wefax related web sites

Eurofrequence Dierking in Germany - Accessories, like universal audiofilter, Mixer interface for sound card, highvoltage powersupply, accessories for 706, hamradio vacation,Roger Beep, Microphons, Headsets and more. Please look

Funkshop.com - German Ham radio dealer for hf radios by Icom Yaesu Kenwood Alinco and Alan

AZMap - Azimuthal maps generator - AZMap is a freeware Windows program for the Windows PC which will generate, display, and print an Azimuthal-Equidistance (A-E) map of the world, centered at any point on the surface of the earth (except very near the poles). The A-E map is also known as a Great Circle map since straight lines from the center point to any other point always fall along a great circle path and represent the shortest distance between the center and that point

ptelnet - ptelnet is a powerful communication software for the Palm Computing platform, By using the built-in TCP/IP stack (telnet mode), it acts as a Telnet Client. By accessing the serial (RS232 or IR) port directly (serial mode), it acts as a standard Terminal Emulator. Freeware

QRG_DB1 - QRG_DB is a database for the Palm OS computer to control a Yaesu FT-817 Transceiver via the CAT interface

Ferrite information - Ferrite Toroidal Cores, Magnetic Properties of Ferrite Materials, EMI - RFI Suppression Design Considerations, Ferrite Beads, Ferrites for RFI Ferrite Cores for RFI Suppression by CWS ByteMark

Interference Handbook - Interference to home electronic equipment is a frustrating problem; but, fortunately, there are several ways to deal with it. This handbook provides a step-by-step process for eliminating the interference

ARRLWeb: Computer EMI - How track and solve electrical interference from you computer

EMI from RF-Driven Lamps - Information about RF driven lamps

General Information about RFI/EMI - RFI/EMI RadioFrequency interference/electromagnetic interference by ARRL Technical Information Service page

FCC interference handbook - This is the electronic version of our "Interference to Home Electronic Entertainment Equipment Handbook"

Telephone Interference - Telephone EMI, questions and answers on how to solve interference problems to phone lines

RFI Information Page - This page gives information about Radio Frequency Interference, the unwanted reception of radio signals. You'll find out how to determine what is at fault (the transmitter or the receiver) and what you can do in either case.

EMI from Lamps - Radio Frequency Interference To/From touch lamps and dimmers

Using ferrites for interference suppression - This tutorial is meant to shed some light on the use of ferrites, and also presents some comparative frequency domain measurements both to illustrate some of the points, and to give designers an idea of what they might expect in using and specifying a ferrite component

Electromagnetics, EMI, EMC, EME, RFI - RADIOING eEngineer RFI EMI information

Ham Radio Online - Computer Networking RFI - This page is to provide links to resources and information regarding technologies to reduce computer interference