cfa frequencies

Log Periodic Antenna Design  ^pop - calculates the dimensions and spacings of the elements needed to build a log periodic antenna, given tao, sigma and the lower and upper cutoff frequencies.

Advanced active VLF Loop - Article on using loop antenna in very low frequencies

QPR and portable antennas articles - This is a collection of articles, generally from QRP-L, about QRP operations and portable antennas

Field-Deployable Antennas - Resonant dipoles, the W3EDP and end-fed wires, the extended double zepp, non-resonant doublets, and the "Zip-Cord Special" , the W6MMA vertical.

Amateuradiomalaysia - This site is meant to assist all Amateur Radio members know the "ins" and the "outs" of how to enjoy the hobby of getting on the amateur radio frequencies, by 9W2SSJ & 9W2RYS

KVK Antenna Systems - The manufacturer of the NuBeam, Vipole, and the multi-band Quad-Folded-Dipole (or QFD for short) antenna. Also have a unique multiband vertical which can combine operation on multiple HF frequencies as well as provide high gain on 50, 144 and 438MHz in a single antenna.

RF HAMDESIGN - An engineering oriented organization specializing in the design and manufacture of high performance parabolic antennas, 3dB high power RF couplers, Antenna power splitters, directional RF couplers and more items for RF transmission from HF through Microwave frequencies.

What is QRP - To those new to the hobby of Amateur Radio, hearing the term QRP often raises questions: What is QRP? Why do some hams choose to operate QRP? How can I operate QRP? These are good questions, and all are worth asking. This article will attempt to answer these questions. by William Eric McFadden

US Frequency allocations - Searchable database of frequency allocations in the US, from cellular frequencies, paging frequencies to marittime and microwave frequencies.

QRP Calling Frequencies - Where to operate QRP

Frequency Calibration for Weak Signal Work - Accurate calibration of your receiver and sound card is necessary for good results with the weak signal modes in use at LF. Modern receivers with master oscillators that are synthesized to provide all conversion frequencies greatly simplify the process. This article describes a method of making the necessary measurements and adjustments to an ICOM R75 receiver and a sound card, using the ARGO software

Longwave operations - In the VLF portion of the spectrum it is easy to listen to the emissions created by the Earth itself. These emissions are generated by many different mechanisms and are often beautiful to listen to. Coverage on LF and MF frequencies

How to make your ham radio system mobile - How to make your ham radio system mobilemany ham radio operators carry radios for fun, safety and public service activities. radios for both vhf and hf frequencies can easily be installed in vehicles.

IV3YNB CW pages - Pages fully dedicated to beginners guides, includes an interesting sample of a CW QSO, and a list of frequencies to practise morse code, useful for beginners,

QRP Station in a Bag - QRP Station in a Bag is a complete QRP station in an old laptop PC carrying case (photo). It is a true "Work in Progress" in that wd8rif is constantly changing the contents of the bag as learn what works and what doesn't.

Near-Real-Time F2-Layer Critical Frequency Map - This map can be used to determine the frequencies that will always be returned to the Earth. Transmitted frequencies higher than the indicated contours (which are given in MHz) may penetrate the ionosphere, resulting in lost power to space. The map shows the radio auroral zones as green bands near the northern and southern poles.

The Radio Reference - RadioReference.com, scanner frequency and radio communications reference source, with complete conventional frequency assignments, trunked radio system information, frequencies, and talkgroups, FCC License assignments and maps, 10-Code Lists, agency maps, files, downloads, links, and detailed agency information for most public safety, military, and local government activities.

The G4PYR MF Coastal Radio Website - Website dedicated to Coastal Radio Stations, includes frequency lists for memdium frequencies maritime stations

NSW Emergency Service Scanning - Scanning information (frequencies and talkgroups) of the emergency services in NSW, such as the NSW Police Force, NSW Fire Brigades, NSW Rural Fire Service, NSW State Emergency Service and Ambulance Service of NSW.

Sydney Scan - Frequencies for radio scanning enthusiasts from anywhere around Sydney, Australia

LouisvilleScanMan - One stop site for scanner users in Louisville Kentucky. Frequencies,10-Codes,Unit Numbers,Scanner News and more. Covering Fire,Police,EMS,Disaster,Civilian Emergency,Aviation,Railroad and other services.

Bergenscanner.com - Radio frequencies for Bergen County located in Northern New Jersey

ILGdb - Free program that interfaces most ICOM radios with the ILG radio frequencies database and lets you click a station in the database to tune your radio to the station, or scan the list looking for stations that are on the air.

FREQ DB Icom - Program that interfaces with a text file of frequencies plus other data and tunes your ICOM radio. You create this data yourself, and can use almost any data you wish. You use the program by clicking a station in the file to tune your radio to the station or net, or scan the list looking for nets that are on the air.

DDS VFO Controller - Control the NJQRP DDS Daughtercard from your PC. The DDS Controller has eight user programmable configurations. Each of the eight configurations have twenty memory cells for saving and recalling frequencies