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PA3ANG online receiver Ten-Tec RX320 from holland

The "EZ-Tuner" is a homebrew automatic legal-limit antenna tuner that covers all amateur HF bands from 160-10 meters. Using a T-network design and controlled by a BASIC Stamp BS2sx microcontroller, the EZ-Tuner will match at least a 16:1 VSWR for either unbalanced or balanced transmission lines.

X-Beam antenna by K0EMT for 50 Mhz and VHF UHF bands

Esr meter to measure the equivalent serie resistance of capacitors

Sharing beverage antennas with this switch boxes is possible. This article describes a 6-position remote antenna switch for Beverage antennas on 3 bands (160m, 80m, 40m). It allows selecting one of 6 antennas for each band without affecting other receivers. The system uses a control box with a rotary switch and a separate splitting box with bandpass filters for each band.

The Cedevita-20 is a hybrid monoband antenna, the result of merging the radiator of a shortened vertical with one element of a dipole. It fits on most balconies and must be hung from the ceiling. By ik1zyw Paolo Cravero

US ham radio band plan in pdf available for download and print

A full featured Receiver Controller for TenTec Rx320 with Audio Processor, digital modes decoder, ILG DataBase Manager and much more. Support for Drake R8A/B,ICOM PCR-1000, ICOM R756Pro and ICOM R756 Pro I ICOM IC-R75, JRC NRD-535, Kenwood R5000, TenTec RX320(D) and TenTec RX350D receivers

Dedicated to Yaesu FT847 with mods infos and links... by F1MDT

Control an ICOM PCR-100 and listen to the audio stream. This web controlled receiver si based in the Netherlands by PA3ANG and offer 10kHz - 1300MHz in AM, FM, FMW

Servicing radios made in the 1930's, 40's and 50's. Speaker reconing for vintage and modern speakers.

Pictures of the 160 meters dipole antenna at W5JGV

These web receiver based in Kiew Ukraine show PSK31 activity on 20m band 14.070-14.074 MHz remotely by using a web browser. Requires java by the MixW team

Lets you automatically record your favorite radio programs from Web Radio broadcasts, and then listen to them later on your PC, MP3 player or Pocket PC.

USB LSB AM Modem (Modulator/Demodulator) for SdR and DSB (direct conversion) transceivers by F6CTE

Forum thread about possibility to extend VX-6R to freeband and 6 meters

Web site updated several times per month. It covers all aspects of ham radio.

A High Efficiency Extended Length Mobile Antenna The antenna itself is 3.42 meters or 11 feet 2 inches long from the top of the mounting spring to the tip.

Fatpigdog's Real Time FFT Audio Spectrum Analyzer. User interface has the look and Feel of an HP Spectrum Analyzer. But, in addition to the regular Spectrum Plot, it also produces detailed Waterfall plots. The user can optimize the color map, chosing from a wide assortment of color themes. This analyzer supports multiple traces, trace arithmetic and normalization.

Search for call sign and display maps and dxcc info

End-Fed Half-Wave Antennas (EFHWAs) are analyzed for their utility in portable QRP operations, emphasizing their simplicity, efficiency, and predictable radiation patterns compared to other portable antenna types. The discussion contrasts EFHWAs with vertical antennas, random length wires, and center-fed dipoles, highlighting the common pitfalls of each, such as ground system dependency for verticals and feedline issues for dipoles. The article details the electrical half-wavelength calculation using the formula L (Ft) = 468/F(MHz) and explains how EFHWAs can be resonant on harmonic frequencies, enabling multiband operation. Various deployment configurations are presented, including the inverted L, inverted Vee, sloping wire, and vertical setups, each with specific advantages for radiation angle and polarization. For instance, a vertical EFHWA offers a low angle of radiation suitable for DX contacts without requiring an extensive ground system. The resource also addresses the counterpoise requirements, suggesting a quarter-wavelength wire or connection to a metallic structure for decoupling. A schematic diagram for a simple parallel-tuned circuit tuner, based on the _Rainbow Bridge/Tuner_ design, is provided, detailing component values for 30 and 40 meters, including a 6 microhenry toroidal inductor and a 20-100 picofarad mica compression capacitor. The tuner's adjustment process for SWR matching is also outlined.

Homebrew Sector Antenna for Wifi ISM band (2,4GHz)

KGKSDR is my attempt at some SDR decoding software. I'm putting this software together purely as a learning exercise, to better understand the mathematics behind SDR in general.

IC 706 modifications collected by mods.dk

Cancelling out unwanted noise sources by DL3FP

Modifications for Icom IC-2100H by mods.dk

An easy to build moxon antenna for portable use. A Moxon Rectangle is a two element beam, where both elements are folded towards eachother.

Official IARU Region 1 band plan

Index of logs hosted on DX.QSL.NET

Illustrates the global distribution of **DX-Cluster** nodes through an interactive map interface, enabling radio amateurs to visualize and access real-time DX spots. The resource provides direct TELNET and HYPER links for each node, facilitating immediate connection to various clusters for up-to-the-minute propagation information and station activity. This visual approach simplifies the process of locating and connecting to a suitable DX-Cluster, whether for local or international DXing. Amateurs can use this tool to quickly identify active clusters in different geographic regions, which is particularly useful for **DXpedition** planning or contest operations. The direct links streamline access, bypassing manual configuration for many cluster types. It serves as a practical aid for operators seeking to monitor band conditions, find rare DX, or participate in competitive operating events by leveraging aggregated spotting data.

This article documents an unobtrusive antenna for operation on 7MHz, primarily for contacts with stations at up to 1000Km range.

Radio-TNC wiring diagrams index

K0EMT 160 meters sloper antenna

Yupiteru indistries web site, japanese only.

The alternative multi-band solution, covers more bands than a G5RV, light weight, won't damage your trees.

Clips of DX audio, some dating back to the late 70's to early 80's and up to March 2001

The PIC-MORSE is an electronic iambic keyer, integrating a generator of Morse code and a sidetone. It is built with a microcontroller PIC16C711. In French

Software for radiomonitoring, radio spectrum analysis. MDS is designed for the real time radio spectrum analysis. It performs real time activity analysis, signal search and collects spectrum data for post time analysis.

13.8 V / 15 A from a PC Power Supply in German

CocoaModem is an opensource MacOSX application which implements modems (modulator-demodulators) for RTTY PSK MFSK Hellschreiber CW SITOR HF-FAX provided by W7AY

This page is a short description of the four phased verticals system i've build and used. It is primarily intendend to be used on the lower bands 160m, 80m, 40m.

It consists of a group of JavaScript driven web pages that are intended for use as a quick reference for Ham Radio operators or just anyone interested in electronics. Offer calculators for Resistors, capacitors, inductors, power supplies, filters, attenuators and antennas

The starting idea was to build a battery charger for Pb battery used in car and moto...

Satellite Finder is a way to accurately point satellite dishes at communications satellites in geostationary orbit.

The Double Bazooka Dipole is a half wave dipole with an attempt at compensation of the reactance change that occurs around resonance for a half wave dipole.

List of italian airport frequencies

some maps for the UI-View program that SM7DKF is using for APRS

Modifications collected by mods.dk

Informations about Scannings, with frequencies, information about scanning, hardware and software reviews

ARRL index of document about trapped antennas and notes on traps usage