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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

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

Project plan for a 4 element yagi beam for 50 Mhz

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

Collection of mods for the Kenwood TS-850

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

A morse code tutor for the Macintosh.

A full size delta loop antenna for top band by PA3FUN

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

Angle Linear has been producing GaAs FET preamplifiers since 1980

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.

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

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

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

CB and ham radio dealer in spain

A wip antenna for 6 meters band by JA1HWO

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

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

German Web site

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

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

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.

All bands HF mobile antennas manufacturer

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

Recordings of shortwave numbers stations

Military antenna masts

W1YW QRZ page dedicated to fractal antennas

German page about packet radio, english version available

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.

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.

A monoband antenna with large bandwidth in French

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.

Article on PC to radio interfacing by Paul Umbdenstock, WA1VOA

Excellent poster representing the electromagnetic spectrum from 31.2 mHz to 6.52 EHz, PDF file poster designed by Anthony Tekatch

706 MKIIG picture and specifications by rigpix db

Freeware windows program by VE3NEA that allow to view and edit the Master Callsign Database file used in many contesting programs, import and export callsigns, auto-download announced DX operations.

Power supplies, electrical testers, battery analyzers, cable tester, rf generators, spectrum analyzers, Digital/Analog Oscilloscopes, Multimeters , attenuators, frequency counter

You can use almost any Icom handheld to contact your 2720H back in your vehicle for crossband repeating.

ARRL comparison of HF transceivers, including Elekraft, TenTec,Icom, Yaesu and Kenwood recent transceivers based on QST product reviews

Essential tower tool invented through necessity.

This free software is an application solely for the use of controlling the Kenwood TS-480. Can be used to edit, save, and export to the TS-480 information such as Memory, Menu, and Auto Mode frequencies.

Antenna accessories and related products

Building a Dummy Load and Measuring Power Accurately

Schematic for Data, power, CAT, Key and Mic connection interface cable

Developed by Japanese 6 Meter Hams in the 1970's can be designed and built for almost any band

Ham radio dealer in Valencia Spain

This program displays solar-terrestrial data for radio waves propagation that is provided by the N0NBH web-service.

Calculate design for a quadrifilar helicoidal antenna