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The current ARRL DXCC country list by Bill Brelsford, K2DI

Search for your call in many of the logs hosted online, also contains links to other logs on the internet.

Proppy: Online HF propagation predictions using the ITU Recommendation P.533-13 Propagation Prediction Application.

Amateur Radio Maps online mixer of different selectable layers, including DXCC references, IOTA references, ITU and WAZ Zones. Works with most web browsers make heavy javascript usage.

Portable magnetic loop antennas - G4TPH Mag-loop antennas Reviewed in PW and RadCOM, Both QRP and QRO, Portable. The only Magloop on the market that is fully portable

Swedish made, lightweigt towers

GitHub reposotory of QradioPredict, a radio propagation prediction tool for VHF-UHF, based on the Irregular Terrain Model, also known as Longley-Rice. Can be used as a repeater site planing tool. Has an internal APRS client which can be used to display stations as a landmark.

Multiband and monoband HF Vertical antennas and rotatable dipoles manufacturer based in Texas USA

Features and specifications for Yaesu FT 857D

United States Scanner Frequencies, Phone Numbers, and IP Addresses

Demonstrates the construction of two distinct wideband RF preamplifiers, detailing their component requirements and performance characteristics. The first design leverages monolithic microwave integrated circuits (MMICs) such as the MAR-6, MAR-8, or PGA103, offering a broad frequency response from DC to 2 GHz with a gain of 22.5 dB at 100 MHz and a noise figure typically below 3 dB. This MMIC-based amplifier incorporates protection against power supply transients and features a 50 Ohm input/output impedance, operating from an 8-20 volt supply with low current drain. The second preamplifier design utilizes a BSX-20 transistor, providing amplification across the 14 MHz to 550 MHz range. This simpler, more economical build achieves an average gain of 12 dB at 145 MHz and a noise figure of approximately 1.1 dB. It operates from a 7-15 volt battery supply with a current draw of 6 mA. Both projects emphasize critical construction techniques, such as maintaining short RF connections, ensuring 50 Ohm impedance paths, and mounting the circuit within a shielded enclosure to optimize performance and minimize noise. The resource also discusses phantom power options for antenna-mounted preamplifiers and precautions for use with transceivers, including output protection diodes and static bleeders.

An interesting article on building a 4 elements yagi antenna with gamma match for the 2 meter band. This article include two videos demonstrating assembling procedure by KG0ZZ

A telescopic pole that you adjust to suit the band you're working on , tested on 40 20 and 15 meters band by M0PZT

S9DX log Online

A monoband end-fed half wave for 10m, 20m or any other HF band, includes a PDF with detailed information to build your own monoband or multiband antenna

CB Radio and 10 through 12 meter band radio dealer. Ranger Communications factory authorized dealer. Service 10 and 12 meter and CB radios.

A new SDR-receiver from the italian SDR developers community. Low-cost, DDS-less Software Defined Radio full coverage receiver for all HF bands, used with powerful software on the PC for multi-mode operation

Motorola dealer , garmin GPS , cb, HAM radio , radio rental ,portofoon verhuur , walkie talkie located in Amsterdam , Holland

A small company that specializes in antennas and accessories for radio hobbyists who enjoy DXing the AM broadcast and LW bands

A page dedicated to the doble bazooka antenna with dimensions for all HF bands

True Ladder line and Wire antennas

Online map creation using AZ_PROJ

John talk about Yaesu VX-3 as an interesting upgrade from VX-2, other reviews cover Kenwood TH-D7 TH-6A Icom-91A Kenwood TM-D700A Yaesu FT-817 and Icom IC-7000

Based in San Diego CA, collectible radios, test equipment, tubes, antique radio parts, speakers and kits

Circuit diagrams to homebrew different baluns by vk2awx

An attempt to modify and try out the unusual antenna first described by Bill Petlowany, K6NO, in World Radio Magazine

SATBUSTER for Windows is especially designed for satellite visual observers and trackers. Its users, mainly amateur astronomers and radio amateurs, appreciate both the accuracy and the simple to use graphical interface.The software is aimed to hobbysts. However a growing number of plain folks are starting to use this tool to recognize and look at the International Space Station and the Space Shuttle during its missions too

HFCC manages and co-ordinates global databases of international shortwave broadcasting in keeping with International Radio Regulations of the ITU. Operational Schedule, available for free download and iteractive schedule

An 87ft inverted L portable antenna working on 80 40 30 20 15 meters band

Interactive CW Keyer the best for DXers

The Swedish EH Antenna Group

Terrasat Communications specializes in advanced RF technology for satellite communication, focusing on _Intelligent Block Up Converters_ (IBUCs) and Solid State Power Amplifiers (SSPAs). These products are engineered to enhance satellite link performance, offering features like extended frequency ranges and high power efficiency. The IBUC series, for instance, integrates a BUC with an SSPA, enabling operators to install, configure, and monitor units for both commercial and military satellite applications, ensuring reliable, high-performance connectivity worldwide. The company's offerings support various satellite bands, including C, X, Ku, and Ka, providing solutions for diverse operational requirements. Their technology is designed for robust field performance, with products like the _IBUC2_ and _IBUCG_ models demonstrating the integration of advanced diagnostics and control capabilities, which are crucial for maintaining optimal signal integrity in demanding environments. Terrasat's focus on _SSPA_ technology underscores a commitment to power efficiency and compact design.

What Amateur Radio (ham radio) is. How to get started in ham radio. License requirements. Where to find instructions.

Automatic Picture Transmission (APT) is used by Satellites to enable a fully automated unattended reception of the transmitted pictures.

Electronic Kits and parts

Coax is a very important part of a satellite station. It is almost as important as the antennas you choose. This article discusses choosing coaxial cables for satellite communication, emphasizing factors like line loss. It compares types such as RG-8, RG-58, Belden 9913/9913F, LMR-400, and hardline, highlighting their impact on signal preservation.

Your world-wide source for Heathkit, Drake, Collins and Dentron amplifier parts & upgrade kits

Ham Radio Android Apps to displays your current QTH locator on Google Maps using the GPS or WiFi / network location.

This is from a posting on the BARK PBBS Keith, WB2VUO

MorseMaker is an up-to-date replacement for the Morse Machine shown further down this page. It has been re-written using a different programming language and is now entirely 'stand-alone' requiring no run-time support files. This version also works with Windows XP and can use the soundcard but please note that, unlike its predecessor, it does not split the alphabet into smaller 'learning' blocks and does not incorporate the Morse reader.

A 400 W 144 MHz GI7b Linear amplifier

Ham Radio Club in the Philippines

Icom IC-706 Extended receing mod From OH6LGM

Article on using loop antenna in very low frequencies

TS-850S typical faults and solutions

A beam fractal antenna for 20 meters band

HFUnderground.com is dedicated to documenting longwave, mediumwave, and shortwave stations, including broadcasters, utility/military stations, pirate radio and spy numbers stations.

Constructing a functional spectrum analyzer for the 0-100 MHz range presents a significant challenge for radio amateurs, often requiring specialized components and careful calibration. This project details a homebrew spectrum analyzer design utilizing common integrated circuits like the _SA605D_ FM receiver IC and _MAR-6_ MMIC amplifiers, aiming for a cost-effective solution. The design incorporates a low-pass filter, RF amplification, a voltage-controlled oscillator (VCO) for downconversion, and multiple IF stages at 150 MHz and 10.7 MHz, with a resolution bandwidth (RBW) of 15 kHz. Critical components such as the _SBL-1_ mixer and varicap diodes are specified, alongside instructions for winding inductors and tuning filters. The analyzer's performance is discussed in terms of input level limitations, specifically the 1dB-compression point and third-order intercept point, to ensure accurate measurements and prevent component damage. The _SA605D_'s logarithmic Received Signal Strength Indicator (RSSI) output serves as the detector, driving the Y-input of an oscilloscope, while a _TL084_ op-amp generates the sweep signal for the X-input. Potential enhancements include adding a step attenuator, improving front-end filtering, and implementing switchable IF filters for variable RBW, allowing for greater versatility in analyzing RF signals.

Unique and Hard-to-Find accessories for Amateur Radio. Featuring Plasti Dip products, DK9SQ Masts, Wire Antennas, AEA Antenna Analyzers and RF Connectors too!

Amateur radio products and support for rig experts brand in the USA. The new USA RigExpert SD, RigExpert Plus, MixW Software