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Mini-Operating Guide includes useful hints on Using the HM-133 Microphone, Basic Operation, Operating through a Repeater, Programming a Memory Channel and Assigning a Memory Channel to a Memory Bank

Presentation of the QO-100 the first geostationary OSCAR from Qatar by AMSAT-DL

Check out these vintage QSL cards from the 20th Century in this gallery of old QSL cards.

manufacturer of passive electronic components, emerged from Philips Electronics Components, ceramic capacitors, resistors, fuses, varistors

You can upload your adif-file It then checks the qso for specified band and if a maidenhead locator is specified. It then builds an array and plot a graph.

A Simple Serial and Sound-Card Interface for the Yaesu FT-857D using an FT232R USB-to-serial bridge chip.

Broadcast listenening radio magazine in spanish

The DIY 137 MHz WX SAT V-dipole antenna project details the construction of a specialized antenna for receiving weather satellite transmissions. It provides specific dimensions for the dipole elements, designed for optimal reception around the 137 MHz band, which is commonly used by NOAA and Meteor weather satellites. The resource outlines the materials required, such as aluminum tubing for elements and PVC for the support structure, along with the necessary coaxial cable and connectors. The article presents a clear, step-by-step assembly process, including how to form the V-shape and connect the feedline. It emphasizes practical considerations for mounting and weatherproofing the antenna for outdoor deployment. The design focuses on simplicity and effectiveness for amateur radio operators interested in satellite imagery. Key aspects include the precise angle of the V-dipole and the lengths of the radiating elements, which are critical for achieving the desired circular polarization response for satellite signals. The resource includes photographic documentation of the construction phases and the final mounted antenna.

The Primary N6OCS Repeater is located at 5700 feet on Santiago Peak in the Santa Ana mountains.

How test transistors and diodes with a simple digital multimeter.

The WhereAVR is a small, lightweight, low-power, and low-cost APRS tracker with a full compliment of analog and digital I/O, as well as the ability to decode ax.25 packets. This allows for the reception of remote commands without the need for a real TNC.

YOTA Youngsters On the Air Facebook public group

Replacement high voltage metering resistors procedure

Wireless Society of Southern Maine Projects, instructions and photos for many ham radio projects and experiments, including antenna construction and modelling, kit building, station setup, restoration and more

Hytera, a leading designer and manufacturer of professional mobile radio communication equipment, offers complete and customized communication solutions to government, public security, utility, transportation, enterprise & business for higher organizational efficiency.

This article is about a homebrew 6 meter lightweight Moxon antenna. Article includes a full part list, instruction to assemble the parts and pictures.

Master Callsign Database Editor allows to create and modify Super Check Partial database files used by many contesting programs in DTA and SCP formats. The files produced by Master Editor in DTA format can be used with CT, WriteLog, TRlog, SD, and others. The SCP versions of the produced files are for use with Win-Test, N1MM+, and others. Master Editor allows to create a callsign database from a separate log or from a set of logs in the Batch Import mode.

The vOICe Learning Edition can be used in combination with a regular oscilloscope, allowing blind users to hear any oscilloscope trace.

This free app encode pictures in Slow Scan TV SSTV signals. Support the most popular modes Martin 1, Martin 2, Scottie Modes, Robot and Wraase modes. Image editing is even possible with som text overlaying features

The Bazooka antenna, a coaxial dipole, functions as an omnidirectional antenna with vertical or horizontal polarization. Patented in 1939 and refined in 2006, it features a quarter-wavelength coaxial cable with separated conductors. The outer conductor connects to a sleeve, while the inner conductor extends vertically. Initially complex, it has been simplified for versatile use, including military applications. Adding elements can modify its behavior for NVIS or Yagi-Uda configurations. Experiments in 2007 at the Campus de Pesquisas Geofísicas in Paula Freitas-PR demonstrated consistent VHF and UHF performance, showing reliable return loss measurements despite variable weather.

The Advanced ATV Repeater is probably the most versatile ATV repeater controller in The World. It can run entirely under the operating system or all repeater functions can be controlled from any other computer

Weblog from Florence Italy, with personal infos and updates on his ham radio activity

Stand Alone Software Defined Radio, direct sampling receiver from 30 kHz to 1700.00MHz continuous frequency range, LAN interface for remote access

This article demonstrate how to build and mount a 40 meter loaded dipole using basic materials. This antenna reduce the overall length of an HF dipole through the use of loading coils.

Introduction to operating on microwave bands at VKFAQ

Product information, resources, enhancements and links of the popular ICOM IC-756PRO III

What are the Differences between UV5R and UV82 Series

A balun is a MUST for dipoles or similar antennas when they are feed with coaxial cable. From the RF point of view, the shield can be modeled as two conductors, the internal shield (the real shield, this is, ground) and the external shield, who is really far to be ground. In this way, your dipole has 3 arms, the two from the dipole and the coaxial cable shield (external face)

A homemade morse code decoder project, providing a detailed schematic and pictures

EDI is a common electronic data file format required to submit contact logs. Very popular among contest logs formats.

Listen to HF communications via the KiwiSDR online receiver located in Badgad IRAQ locator LM23fh. This web receiver is running a MLA 30+ antenna and can be tuned easily on all HF bands from 10 to 80 meters.

Personal web site by Joe PS8ET an active amateur radio operator from Brazil very active both on HF bands and on Ham Radio Satellites.

DK7IH QRP transceiver for 14 MHz. This small and compact home made transceiver with a max power output of 5W, the VFO module is based on the clock oscillator chip Si5351A by Silicon Labs ATmega168 and OLED 1306

Technical Comments about Transmitter Intermodulation, Distortion, and ESSB (or Hi Fi Wide Fi SSB) audio or over equalization by W8JI

Ultimax antennas manufacturer of amateur radio End-Fed and bazooka antennas made in USA

Amateur radio club in Bowling Green, Kentucky, dedicated to the pursuit of excellence in working other amateurs all over the world.

Amplitude Modulation (AM) is essentially a mixing process where the audio modulating signal is mixed with the radio frequency carrier

Portuguese Amateur Radio Station with personal info and logs.

A W8JK/Moxon antenna variant with 400cm long monopoles is detailed, demonstrating a **1dbd** gain improvement over the traditional Open-Folded W8JK. This design, relying on the _Moxon principle_, achieves higher radiation impedance, leading to increased antenna efficiency and reduced losses. The article includes VNA output data for various HF bands, showing impedance characteristics from 10.1 MHz to 50.1 MHz, and provides NEC model wire definitions for the antenna structure. Field tests performed by F6IIV, Marc, compared his W8JK Moxon style antenna against a Cobweb antenna at the same height. Results indicated the W8JK Moxon variant provided a **6dB** (1 S-meter point) advantage on most bands from 20m to 10m, and a significant 10dB (1.5 S-meter points) advantage on 15m. The antenna features a 2.70m boom and a turning radius of less than 3 meters, making it suitable for limited space installations while maintaining bi-directional performance on most bands.

927.1250 MHz Santiago Peak, CA USA

Radioamadorismo ,amador, ciência, comunicação, rádio, hooby, experiências from Brazil by PY3AB

Highlights the VE2CWQ amateur radio club, a key player in Quebec's emergency communication network and a member of the _RAQI_ federation. The club actively supports the _CANWARN_ program, providing crucial communication links during outages or natural disasters when traditional telecommunication infrastructure fails. Members are encouraged to monitor specific frequencies for vital updates and instructions during emergencies. The club maintains a repeater, VE2RAW, operating on **449.325 MHz** from Mont-Rougemont, ensuring reliable local coverage for its operations. VE2CWQ emphasizes the significant public service role of amateur radio beyond hobby, contributing to community safety and resilience.

An experimental slim jim antenna for 70MHz band made with a wireman slotted line.

An explanation of the different procedures and definitions that are commonly used for blocking dynamic range (BDR) measurements. Dynamic range in general is the ratio between the weakest signal a system can handle and the strongest signal the same system can handle simultaneously without an operator switching attenuators or turning volume potentiometers

This site is established by a group of ham members who wish to see the interests of amateur radio in Malaysia protected.

W1REI / DU1LWQ amateur radio station blog from California

The Pickens County Communications Group are volunteers for the Pickens County Emergency Management Agency in Pickens, S.C. and members of R.A.C.E.S.-Radio Amateur Civil Emergency Service, with the South Carolina State Guard. We are not a club. We are a group of amateurs radio enthusiasts with similar interests, dedicated in providing emergency communications for public service, public safety, and commercial communications for local agencies. We also provide Skywarn communications for Pickens County and the National Weather Service in Greer, S.C.

Fractional Wave Loops antennas are a sort of magnetic loop antennas that differs in several aspects from the standard ones. Author is now SK however in his page he posted several examples and interesting links

Simon Saunders' Blog, from UK

An FCP is not magic. It has no gain. An FCP improves an antenna system by replacing more loss with less loss. Some have been able to erect better wires in the air because the small size of the FCP allowed better placement of the antenna.