Search results

Ultimate VHF/UHF DX resource site

Explore this high-resolution ITU Zones Map, a critical reference resource for amateur radio operators, international broadcasters, and telecommunications engineers. Originally established by the International Telecommunication Union – Radiocommunication Sector (ITU-R) Broadcasting Services Division (1999), this chart accurately divides the globe into 90 specific CIRAF zones. This authoritative visual guide is indispensable for planning High Frequency (HF) radio propagation, scheduling international broadcasts, and verifying locations for radio contests and awards. Distinct from the 40 CQ Zones, the ITU zoning system provides the official administrative framework used for global frequency management. This digitally enhanced version ensures maximum clarity of zone boundaries and numbering (e.g., Zone 28 for Central Europe), making it an essential tool for technical accuracy in logbooks and station management. It serves as a trustworthy standard for educators, hobbyists, and industry professionals alike.

Presentation by AC8GY on classic G5RV Antennas and other horizontal dipoles, the popular G5RV, ZS6BKW, dipole fan, Alpha-Delta DX-CC and a trap dipole are modeled in EZNEC and compared.

Amateur Shortwave Radios Links and information,Also Swap Radio Groups Bearcat-scanner Drake Radios Hallicrafters and more

VX-7/5R Computer Interfacing by Bas Helman G4TIC

The document titled 'Extending the Range of Your Handheld' by WG7S is a guide on how to extend the range of your handheld VHF UHF transceiver by using an external antenna. It provides information on comparing popular models, selecting the right antenna, and resources for amateur radio antennas.

Notes on multi band HF antennas by G8JNJ

Here is a well documented plan of a 20m-10m compact magnetic loop antenna. Article includes lots of pictures and technical details published by KP4MD

The antenna was built to be used for shortwave listening with a Tecsun PL-660 radio receiver. Later it was used with Yaesu VX-6 handheld transceiver and with Yaesu FT-817ND for shortwave listening.

Fellowship of Christian Amateurs meeting M-F on 40 meters

This transmitter has been designed for use on 20 30 40 and 80 m with 5W output

A simple portable VHF ground plane antenna project used for ARES activities

A three band short Vee antenna is feasible with two legs per side on a dipole. 10-15-20 meters by W8HDU

The X80 is a commercial version of a so-called Rybakov vertical antenna.

A New Way to build a 1/4 Wave Ground Plane Antenna

Ground Plane - 1/4 wave vertical, J-Pole, 3 Element Yagi Beam and simple antenna supports

Iphone apps to monitor HF Beacons by N0HOT

A system to lay the antenna cable through a closed window by OE1VFW

Two-meter and aircraft band receiver specifically designed for RDF on foot, sold by Bryan Ackerly VK3YNG

A simple antenna analyser for the HF spectrum with a built-in signal generator with 3-digit LED frequency display.

Article by VU2GT about VHF antennas, how to evaluate performances and models.

Recepteur decametrique 3 - 30 MHz Detection classique et SDR

GM4JJJ, David with EME on 144 MHz and Astronomy.

The antenna described here is a direct-connect dual-rectangle beam for use on 70 cm between 440 and 450 MHz

Manufacture HF-serie power amplifiers for global radio amateurs. Provide two models: manual HF2000DX and automatic HF2011DX-A

V-U-SHF site

500kHz to 12 meters beacons by SK6RUD/B

Frequency, location and coverage of repeaters in Ecuador.

Bandplans, Beacons and many useful info on VHF operations

A PowerPoint presentation by Bruce Draper, AA5B on how to get started in contesting, no matter if you are a big gun or a little pistol

A home made VHF 2.5kw RF power amplifier made with a GS35B Triode and designed by Frank F1CXX built in 2003

Building a Moxon antenna for 144 Mhz by K2ZS

Radiowave propagation in the medium and high frequency spectrum in DOC format

"Shows who is ""active"" on VHF in EI, Solar Auroral and Tropo information, Vhf logs and maps."

The purpose of this remote antenna switch was to be able to select between four different antenna combinations The unit was designed to work at RF power levels of around 100 watts by G8JNJ

low-noise amplifier for HF reception, amplifies signals 80 to 100 times between 0.15 MHz and 30 MHz. It will let you hear more signals with your RTL-SDR plus Ham-It-Up setup

Receive-only loop antennas have some nice response characteristics that make them ideal when used for reception of skywave signals.

Article about assembling of a Dick Smith Electronics (DSE) 100 Watt VHF Linear Amplifier kit.

This QST article describes the electrical and mechanical design process for two LPs that cover the HF bands from 10-30 MHz

A dual band coax trap antenna designed to work on 20 and 30 meters or on 20 and 40 meters band by Phil W0XI

A PIC Programmer for Windows, support for dsPIC, PIC10F, new PIC12F6xx family, PIC16F9xx, PIC18F

2 transistor transceiver for 28MHz CW

HF DX Web Cluster from JAPAN show spots by JA stations

VHF UHF SHF Toplist including DXCC and EME-Initials

Our group is the North East Weak Signal Group. We are an ARRL affiliated regional club dedicated to the interests of "weak signal" work on the bands 50 MHz -

TS-570 series specifications at universalradio

A project that describes a build a multiband wire beam antenna. A 3 band single feed moxon antenna for 20,15,10 meters.

So, you finally upgraded and are ready to jump into HF. Here are some HF transceivers you might look at.

Yagi with 5 Elements on 2 m, 8 Elements on 70cm and one Feedpoint by DK7ZB

The DK5YA Vhfdx Site is dedicated to the serious VHFDXer, serving the Web for more than 5 years for all of those working Aurora, Meteorscatter, FAI, EME, Tropo, TEP etc. on 50 MHZ and up.