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Setting up and testing a sound card packet radio interface by KD5ZUG

This design was adapted from an article in the ARRL Handbook and built with simplicity and duplicity in mind. This antenna is a vast improvement over a standard dipole with a forward gain of around 8db with a front to back ratio of 10db.

A full size delta loop antenna for top band by PA3FUN

A marriage of the windom and slinky antennasm, article by NC4TC

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.

CW paddle made with a steak knife some simple hardware and a stainless steel fork

The 60 Watt linear amplifier is simple all solid state circuit using power mosfet IRF840.

Radio reef your QTH in the Caribbean St. Croix, US Virgin Islands

A folded wire antenna for 160 meters as appeared on 73 amateur radio magazine june 1997

Google map beacon map on 10 meter

QRZCQ.com provides a centralized online platform for amateur radio operators, integrating a global callsign database with DX Cluster functionality. The service features real-time DX spotting, filtering capabilities for specific bands (e.g., 160m, 80m, 40m, 20m, 15m, 10m), and specialized filters for awards like IOTA, SOTA, WWFF, and QRP activity. It also includes a logbook, QSL manager lookup, contest calendar, and various ham radio articles and news feeds, supporting a wide range of operating activities and information retrieval. The platform aggregates data from multiple sources, offering a dynamic view of on-air activity and callsign information. Users can register for free to access additional services, including a personal logbook, buddy lists, and chat features, fostering community interaction among over 198,600 registered users. The DX Cluster displays recent spots with frequency, DX call, spotter, and remarks, covering bands from VLF to VHF. Beyond DX spotting, the site provides resources such as repeater directories, propagation information, and a swapmeet, making it a multi-faceted tool for both casual browsing and serious DXing or contesting. The service also highlights active users, latest news, articles, and videos, keeping the content fresh and relevant.

MorseGen is a simple program the purpose of which is to generate Morse Code at whatever speed you feel comfortable reading, for practice purposes. It wasn't designed to be a tutor for those who know no Morse at all, although you might find it useful for that purpose. It doesn't have a feature for sending small character groups over and over, although this can easily be achieved by creating text files containing the character groups you want to practice.

Project plan for a 4 element yagi beam for 50 Mhz

An interesting arduino project to work as an antenna tuner

Table representing loss of Coax Cables in db per 100ft.

A compact multiband wire antenna suitable for portable operations.

A copper pipe Hentenna for 144 MHz. The Hentenna, a compact, high-gain loop antenna developed in Japan in the 1970s, offers approximately 5.1 dBd gain, comparable to a three-element Yagi. Adapted for 2 meters, it is crafted from copper pipe for simplicity, affordability, and broadband performance. Requiring no feed-point tuning, its construction involves soldering standard copper fittings. Installation demands non-conductive materials to minimize signal disruption. Versatile for vertical or horizontal polarization, it is ideal for FM, repeater, SSB, or CW applications. This design emphasizes practicality and performance for amateur radio enthusiasts

Monitors the space weather parameters essential for HF radio, including SSN/SFI, Ap/Kp, X-ray/Proton flux, and Auroral activity. IonoProbe downloads near-real time satellite and ground station data, stores information for future use and displays it in a user-friendly way.

That just about sums up many peoples attitude towards test equipment. Multimeter, SWR/Power Meter, Dip Oscillator, RF Signal Generator, Cathode Ray Oscilloscope

One popular rumor or thought is that antenna gain doubles every time we double the number of elements

K6DQ GAP titan dx antenna repair

CB Radio, and 10 meters antennas manufacturer

A wip antenna for 6 meters band by JA1HWO

Spread Spectrum Scene. Radio Propagation notes, with downloadable files.

A magnetic loop antenna calculator made with an excel sheet that run also with open office, let you design mag loop antenna dimensions by AA5TB

An invisible magnetic loop antenna mounted under a table by PY1AHD

Build your own multi-band mobile ham antenna with a Hamstick

A QRP 900 grams hydraulic tuned small magnetic loop antenna by PY1AHD Alex.

A morse code tutor for the Macintosh.

In this article the schematic is of AA5TB QRP power meter and dummy (50 Ohm) load combination

Collection of mods for the Kenwood TS-850

Building a Dummy Load and Measuring Power Accurately

How to calculate "phasing line" lengths that actually work.

Low Cost Frequency Counter, Digital Display and DDS-VFO kits

Angle Linear has been producing GaAs FET preamplifiers since 1980

Lookup callsigns in locator, or locator of a specified callsign and display in google map

German Web site

Recordings of shortwave numbers stations

LNA Technology High Performance Low Noise Preamplifiers for Amateur Radio, VHF-UHF weak signal, DX, EME, and commercial applications.

About dummy loads, what are they and how to build one

If you want to interface the IC-746 Pro or any other Icom rig with a computer for rig control, an outboard CI-V CAT device is required.

Produce QSL & post cards, stickers, ID cards, calendars, certificates, awards, membership applications, log and call-books, rubber stamps,T-shirts, brochures, advertising materials.

An efficient 2 meter antenna disguised as a TV Satellite dish. This vertically polarized horizontal slot antenna, cut into the reflector of a TV dish, might be the ultimate stealth antenna.

CB and ham radio dealer in spain

W1YW QRZ page dedicated to fractal antennas

Dutch scanner web contains information about dtmf pagers gsm tetra umts scanners decoders.

A monoband antenna with large bandwidth in French

Gamma match antenna is an antenna 1/2 additional lambda with the impedance matching more flexible arrangements (var capacitor) by sliding through the gamma match/road.

German page about packet radio, english version available

If you are interested in the environment, the weather and other natural phenomena then there is something magical about being able to see pictures of the earth from space just as it is right this minute. One way you can do this is by receiving images from weather satellites.