Search results

A further study of the spurious emissions from an FT847 on 70 MHz by G7CNF

Solomon Islands H44G/ Temotu Islands H40T - March 2013 by DL7DF

Sri Lanka 4S7 March 2014

About usage of DTMF Dual Tone Multi Frequency in ham radio applications

This quick-start guide is an attempt to provide some help when coming to terms with the R20 and the manual

Hummelmasten is a German tower manufacturer, provides consultation, engineering, but also assembly and full tower installation

Liberia 2011 5M2TT DX Pedition Official web site

Allocation of 4 meter band worldwide

Ein satellit entsteht und andere amateurfunkaktivitäten...

GM4YEQ Galashiels and District Amateur Radio Society (GDARS)

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

RadioReference page on Radio Shack Pro-97

Notes on using a modified R7100 with discrimator tap

This article provides details on building a 6 Meter J-Pole antenna using PVC pipe for an enclosure. This antenna uses flat 450 ohm Window Line for the tuning stub.

Afghanistan 2011 DX Pedition

March 2015 9Q0HQ Congo DX pedition

Before the advent of satellite communication, maritime communication adhered to an international protocol requiring ships and coastal stations to observe silent periods twice an hour, reserved specifically for emergencies. These silent periods were marked by red sectors on the 500 kHz frequency and green sectors on the 2182 kHz frequency. The 4-second red bars facilitated the manual transmission of the SOLAS distress signal.

Republic of Niger 2017 5U5R DXpedition web site 2017 Mar 9 - 2017 Mar 2 Will operate 160 to 10m, also 5.360 MHz; SSB CW RTTY; QSL via EA5RM

The map display allows you to select by locator, or clicking on the map, where you want to calculate the probability of Sporadic-E by building a combination EPI, Es Probability Index, based on factors using many of the known parameters which can effect Es. T

Experimental Methods in DSP design. The author explains how a software defined radio works to help other amateurs with their learning. This set of tutorials takes you from how to write a single component to a fully working SDR.

Time Mapper UHD is a versatile mapping and time visualization program offering multi-satellite viewing with frequency display and unique country-pairs for PskReporter data. It features live feeds from logging programs and can plot ADIF files. Ideal for schools, offices, or amateur radio stations, it provides customizable 4K or HD world clock displays with over 60 map layers, including ham radio zones and natural features. The program supports various time functions and can import logs for detailed analysis. It runs on Windows 10 or 11 and offers a 30-day free trial.

The Davis County Amateur Radio Club (DCARC) serves as a focal point for licensed amateur radio operators in Davis County, Utah, fostering community and promoting radio communication interests. Members engage in various aspects of the hobby, including local nets, public service events, and technical discussions. The club's activities often involve supporting emergency communications preparedness and providing opportunities for skill development among its members. DCARC maintains a presence in the local ham radio scene, facilitating contacts and knowledge exchange. They frequently participate in events like _Field Day_ and offer resources for those interested in obtaining or upgrading their amateur radio licenses. The club also supports local repeaters, ensuring reliable VHF/UHF communication infrastructure for the region. Their website, dcarc.net, provides information on club meetings, upcoming events, and contact details for prospective members.

Tennessee SERA District

For my SOTA activities, i recently bought a QRP transceiver QRP SW-3B, which is a three-band QRP CW only for 40/30/20 m. So, i needed an antenna that would allow to use these 3 bands in SOTA portable activity. Already having some experience with the EFHW antenna, i decided to build one for 40/30/20m.

Ray-trace radio signals through a realistic three-dimensional ionosphere using Proplab-Pro. This software has been used by the military, researchers, universities and amateur radio operators around the world to assist in determining radio propagation conditions and radio signal behavior. It is one of the most respected and well established software packages for radio engineers and enthusiasts, being actively updated for over 28 years.

Identity of wwff/svff while having a qso with a svff expedition you are welcome to transmit also and two figures

A document that includes a list of all countries implementing CEPT licence, with detailed information on licence types like standard CEPT, CEPT Novice and HAREC. A full list of frequencies, and call signs schemas to be used by foreign operators, compiled by Hans Schwarz, DK5JI

West Virginia SERA

Time-Sync is a freeware software to synchronize the time of your system. Time-Sync is installed as a service, the configuration is very easy for each user and can be done in a few steps. Up to five redundant time servers can be configured.

I happened to stumble across some antenna projects showing common mode chokes 1:1 baluns made of some turns of coax wound on T200-2 iron powder toroids.

Amateur radio station in Parsons TN USA

A simple 6dBi Collinear Antenna for LoRa compared to the Lorank8 gateway default antenna.

This article provides details on building a 6 Meter J-Pole antenna using PVC pipe for an enclosure.

South Carolina District for the SERA

Spy Numbers Stations are shortwave radio stations that are speculated to have been broadcasting since World War I. The true origin and purpose of them are unknown. A popular theory is that these stations are intended for spies in the field using a One Time Pad. Another theory is that they are used in drug smuggling operations.

North Carolina District of the SERA

The program serves to assist in a ham-radio activities secretarial with his hobby , such as Printing QSL cards or print labels directly from the program , printing envelopes and mailing envelopes for the feedback you send direct QSL cards, download address for sending cards direct from QRZ.COM or for any station. Checking whether for the QSO and his country is present QSL bureau.

Georgia District of SERA

SERA Mississippi

SERA Kentucky

A unique, easy-to-use Amateur Radio program for creating County, State, Section and Grid Locator outline maps of North America that can be filled by Hand, from a Contest Logger UDP Feed, or from Imported ADIF or Cabrillo Logs.

The weather station described here uses a TTGO v3 1.6.2 module and various sensors. It displays the data on an OLED screen and transmits them among a choice of protocols to the APRS, APRS-IS, Wunderground servers or via an MQTT broker. APRS data is transmitted on 433.775 MHz (can be changed) using the LoRa protocol. APRS beacons picked up by iGate gateways are then transmitted to APRS servers.

KlaTrack is a Windows-based software application designed to assist amateur radio operators with satellite communication by predicting spacecraft visibility. It provides a simple interface to determine when specific satellites will be above the local horizon, a critical factor for successful two-way contacts via amateur radio satellites. The program processes _Two-Line Element_ (TLE) data to calculate orbital mechanics, offering a practical tool for satellite operators to plan their operating windows. It supports real-time tracking and displays essential pass information. This utility simplifies the complex task of satellite tracking, allowing operators to focus on making contacts rather than manual orbital calculations. While specific gain figures or distances are not quantified, the software's core function directly supports achieving successful satellite QSOs by providing precise pass predictions. It is particularly useful for operators engaging in activities like working the International Space Station (ISS) or other low-Earth orbit (LEO) satellites, where short pass times and precise timing are crucial for maximizing contact opportunities.

Data Decoder Utility is designed to enhance the operating experience for Flex Radio users by providing advanced connectivity to Peripheral equipment and radio control programs (RCPs) otherwise not available.

A CW contest running every Monday, from 1630 UTC to 1729 UTC on 40 and 80 meters band

TN5R will be active from March 9th to March 19th, from 10 to 160 meter on CW, SSB and RTTY

The article describes the construction of a 1:49 impedance transformer designed to match the high impedance (around 2500Ω) of an end-fed half-wave (EFHW) dipole antenna to the 50Ω impedance of a typical transceiver. The EFHW is a popular portable antenna due to its simple construction, but feeding it can be challenging compared to a center-fed dipole. The transformer was built using an FT240-43 ferrite toroid core, with 2 primary and 14 secondary windings for a 1:49 impedance ratio. A capacitor was added in series with the primary winding to improve performance at higher frequencies. The author compared versions with one and two cores, and found that 100pF worked best for the single core design while 200pF was optimal for the dual core transformer.

A QSL Cards collection divided into North American Shortwave Pirate Radio QSLs abd European Shortwave Pirate Radio QSLs

An easy to build 6 watts SSB transceiver for 14MHz. BITX is an easily assembled transceiver for the beginner with very clean performance. Using ordinary electronic components and improvising where specific components like toroids are not available, It has a minimum number of coils to be wound.