hf propagation

G4CQM Homebrew VHF Yagi antennas  ^pop - Homebrew VHF Yagi 50MHz 144MHz 432MHz 1296MHz 2320MHz 6M 2M 70CM 23CM 13CM Yagis

80 Meter vertical Loop  ^new - An 80 meter band vertical loop antenna setup at PA3FUN

G5RV multi-band antenna - Multi-band centre-fed antenna capable of very efficient operation on all HF bands, specifically designed with dimensions which allow it to be installed in gardens and other open spaces which accommodate a reasonably-straight run of 31.1m (102 ft) for the flat-top standard model.

G5RV Multiband hf antenna - info on G5RV antennas by yb0emj

W2BRI's Magnetic Loop Site - Magnetic loop antennas for HF and above , magnetic loop info, how to build a magnetic loop, Magnetic Loop Antenna FAQs.

Build your first dipole - The dipole antenna is an easily designed and made antenna usually used on HF, although can be (and sometimes is) made for VHF and UHF antennas, and in varying forms is also used as part of different designs of antennas – i.e. as the driven element for directional antennas.

SWL antenna distribution system - A methodology for connecting multiple LF/MF/HF receivers to a single antenna via readily available and inexpensive 75-ohm TV cable. Custom made baluns and splitters provide impedance matching and prevent interaction between receivers.

Quarter Wave with radials - VHF quarter wave antenna mainly for scanner usage, The quarter wave antenna is an easily designed and constructed antenna for whatever frequency you want, although with the following design, you may to limit it to the VHF and UHF bands due to the physical size.

Yaesu FT-101 HF Transceiver Home Page - The purpose of this page is to capture and document the Yaesu FT-101 series radios during the 1970's

RA17 series valve subs - Discussion of the various valve types which may be used in the Racal RA17/117 HF receivers

HF Contesting on a Budget - This page contains ideas, hints and tips about Auxiliary Items that will help you to enjoy the sport of HF Contesting without emptying the bank account

PA2MZ Marten - A site of one of the yuongest HAM op. with a HF license

Yahoo! Groups : VHF_UHF_homebrew - Vhf and UHF homebrewers of hardware and antennas. Find help, idea, or someone with just the same interest as you.

Definition of frequency bands - Definition of radio frequency bands, hf vhf uhf etc.

The Shortwave Broadcast Bands - For convenience, the shortwave part of the radio-frequency spectrum is subdivided into bands. Each band has its own unique propagation characteristics

Weak Signal VHF by Tim Marek - K7XC - A complete guide to operating the weak signal modes on VHF/UHF/Microwaves. VHF Contesting honor role for the western states, rover, eme basics and vhf contesting.

The Art & Skill of Radio Telegraphy - For those who are interested in telegraphy, for those who would like to learn it, for those who love it, and for those who want to improve their skills in it

Southern California Repeater Lists - The most up-to-date listing of VHF/UHF amateur repeater stations operating in Southern California.

Shortwave Propagation - Description of shortwave propagation on shortwaves, refers to those wavelengths which occur with frequencies from about 3 to 30 mHz, or 100 to 10 meters

Ham Radio Repair - N4DA - - The Radio Doctor provides complete repair services for all major brands of HF Transceivers and HF Amplifiers, including vintage radios GA USA

Sandys CB Shoppe - Sandy's CB Shoppe. We sell CB's, VHF radios, and CB accessories, service and install CB / VHF radios, Affordable custom electronics design

Shortwave Monitoring Station - Berlin - Shortwave Monitoring Station in Berlin: DX news, HF propagation, greyline, DRM news, QSL gallery, audio recordings and more

Band Master - Band Master is a program for Radio Amateurs that downloads DX spots and displays them in different ways, including a graphical band map. It can be used either as a stand alone application or as part of a logging or contesting software via the COM/OLE interface. Rig control, country/province resolution, azimuth/distance calculator and online QRZ lookup are built-in, propagation prediction and geographical mapping are available through integration with HamCap and DX Atlas respectively.

RF and Microwate Power Amplifiers - RF and Microwave Power Amplifier and Transmitter Technologies, amplifierlinearity, efficiency and available RF power devices.

Direct Conversion HF Transceiver with DDS LO - Direct conversion HF radio with DDS frequency synthesizer is very interesting concept. OH7SV and OH2NLT are experimenting with such rig. Full stories will become available when project matures. Here we have some preview pictures and material.