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VHF/UHF DX site showing latest propagation, software, radio dealers, awards, maps etc.

RemAud is a Voice over IP (VoIP) application primarily designed for two-way amateur radio remote control over the Internet. RemAud uses streaming-audio technology in a client-server architecture. It features high radio sound quality, low latency, low bandwidth and very low CPU usage by DF3CB

Free windows basic and simple CAT program specifically for the Yaesu FT-857 radio. It provides an unlimited memory storage area which resides on the client side.

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

Ham Radio Club in the Philippines

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.

Over **10 million** antennas and flags have been sold worldwide by Firestik Antenna Company, a veteran-owned manufacturer specializing in both CB and amateur radio communication products. Their offerings include a range of antennas, mounting accessories, and coaxial cables, designed for various mobile and fixed applications. The company provides technical support and maintains a network of dealers for product availability. Firestik products are known for their fiberglass construction, which is evident in their _Firestik_ and _Firefly_ antenna lines. The company also produces unique items like the "342 mile per hour Firestik flag," highlighting their diverse manufacturing capabilities beyond just radio antennas. They emphasize their commitment to quality and customer service, including direct technical assistance. The company is located in Tempe, Arizona, and operates under the registered trademark of _Pal International Corporation_. They actively protect their brand, including variations like Firestick and Firestix, ensuring proper representation of their products in the market.

Accessing current contact information for amateur radio operators is crucial for QSLing, award tracking, and general communication within the Ham Radio community. This online tool provides a specialized callbook service, focusing exclusively on Croatian (9A) amateur radio operators who maintain active membership with the Hrvatski Radioamaterski Savez (HRS). It functions as a centralized database, allowing users to look up specific 9A call signs and retrieve associated information, primarily for verification purposes within the Croatian amateur radio scene. The utility of such a focused callbook lies in its direct relevance to local and regional operating activities, including contests, nets, and emergency communications within Croatia. While not a global callbook like QRZ.com or HamQTH, it serves a vital role for Croatian hams and those seeking to confirm contacts with 9A stations, ensuring data accuracy by linking entries directly to HRS membership status. This targeted approach streamlines the process of verifying Croatian amateur radio licenses and membership details.

Simple program for ham radio Uses AX25 support built in Linux kernel, works in X11 graphics environment.

An Active antenna designed for VLF and shortwave radio reception. A small antenna capable of excellent performances on low bands, made on a copper plate and introductio to active antennas.

Live feed from Warren county fire dep. radio

A page about fascinating Very Low Frequency and natural radio, with lots of streaming audio links from remote receivers. Some experimental stereo pairs around the world.

Managing extensive QSO data efficiently requires robust logging software capable of handling diverse operational needs, from casual ragchewing to competitive contesting. HAM OFFICE provides a comprehensive solution for amateur radio operators, integrating essential logging functionalities with advanced features for analysis and award tracking. It supports detailed QSO entry, offers various display and evaluation options, and includes helpful functions to guide users through its interface, ensuring a smooth workflow for both new and experienced hams. The software's design emphasizes user-friendliness while incorporating a wide array of functions, making it suitable for different screen sizes and operating preferences. It features innovative databases for enhanced data protection, improved handling despite increased functionality, and significant speed gains from new background calculations. The program runs stably on Windows XP through 11 (32 and 64 bit) and offers a mobile app for QSO entry and analysis on _tablet PCs_ and smartphones. HAM OFFICE is widely adopted, with an estimated **80%** of German contests logged using the software, and it is utilized by amateurs in **58** DXCC entities. The program supports various aspects of amateur radio, including contest logging, detailed evaluations, and integration with internet resources and shack equipment. It also provides specific support for new license classes like DN9 and actively supports initiatives such as the recognition of _Morse Telegraphy_ as a cultural heritage.

This circuit provides an interface between the Yaesu 920 transceiver and IBM computer sound card which allows data transfer and control of PSK31, RTTY, KEYBOARD CW, and SSTV modes for Amateur Radio

This page displays a 404 error, indicating the original content describing a simple _RS232 interface_ circuit is unavailable. The circuit was reportedly designed for older Kenwood transceivers and featured in chapter 22 of the _ARRL Handbook_. It likely involved basic electronic components for level shifting and signal conditioning between a computer's serial port and the radio's control interface. The intended project would have detailed the construction of a hardware interface, enabling CAT control for specific Kenwood models. Such interfaces typically convert TTL or CMOS logic levels from the radio to the +/-12V levels required by RS232, often utilizing ICs like the MAX232 or discrete transistor circuits. While the specific schematics and bill of materials are absent due to the page error, the context suggests a DIY electronics project for enhancing legacy amateur radio station functionality through computer control.

Applying for an FCC vanity call sign requires navigating the _Universal Licensing System_ (ULS) database to identify available call sign blocks and specific desired combinations. The process involves submitting an online application via the FCC website, ensuring all instructions are meticulously followed to avoid rejection. Typical processing time for a vanity call sign application is approximately **18 days**, after which the ULS database reflects the updated license grant. Operators often seek vanity call signs for various reasons, including aligning with a new license class, desiring a shorter call sign for CW efficiency, or simply preferring a more memorable phonetics. The resource emphasizes self-application to avoid third-party service fees, directing users to verify availability through tools like Vanity HQ. Key steps include selecting a primary call sign and several alternates, ensuring the chosen call sign conforms to FCC rules for the operator's license class. Payment can be made online or via check, with prompt submission critical to prevent application dismissal.

FAR Circuits is exclusively a manufacturer of Printed Circuit Boards for electronic projects that are used by the Amateur Radio and electronic hobby enthusiast.

A site exclusively meant for the novice. Find all the information necessary to become an amateur radio operator! More India specific information.

Web Site of CB Radio station from Vernadsky Research Station on Galindez island 140URL9909

Add-in module to Microsoft Excel, contains a set of radio amateur relevant special functions: DistSphericLocator(Loc1; Loc2) Calculates the spheric earth model distance between two locators [km] DirSphericLocator(Loc1; Loc2) Calculates the spheric earth model direction from Loc1 to Loc2

Large collection of audio clips of foreign radio stations, with identification announcements in various languages, signature tunes and jingles, and of course interval signals.

RCI web site

UJYSAT is a new software for satellite tracking written by IT9UJY, This software is totally free for Amteur Radio only.

A delta loop antenna for 6 meters band with SWR diagram , construction plan and some pictures by IZ8EWD in Italian

Operating Slow Scan Television (SSTV) on Apple macOS systems requires specialized software to encode and decode images for transmission over amateur radio frequencies. MultiScan 3B was an application designed for this purpose, enabling Mac users to engage in SSTV communications. It supported various popular SSTV modes, including Robot Black & Color, Scottie, Martin, PD modes (P3, P5, P7), and AVT, catering to a wide range of operational preferences and compatibility requirements within the SSTV community. The software's capabilities extended to both transmitting and receiving pictures, offering flexibility in how images were processed. Users could select regular, narrow, QRM, and narrow+QRM modes, allowing for adaptation to different band conditions and signal environments. This feature was particularly useful for mitigating interference and optimizing image quality during transmissions on HF bands. MultiScan 3B was built to run on Mac OS X 10.6 and later versions, providing a dedicated solution for Mac users interested in this classic digital mode. Its support for multiple modes and operational settings made it a versatile tool for SSTV enthusiasts.

QSL and Label printing addon to Ham Radio Deluxe by IW1QLH

This purpose of this page is to give a brief description of a 70 MHz transverter that has been published in the Danish amateur radio magazine "OZ"

This resource details the conversion of an 80m elevated vertical antenna to include 160m operation, focusing on a relay-switched design over a trap-based approach. It presents specific feedpoint impedance values, such as **32 ohms** for 80m and **14 ohms** for 160m, and discusses the challenges of SWR drift encountered with the prior trap system during RTTY contesting. The article thoroughly explains the design choices for elevated radials, referencing _N6LF QEX data_ to debunk common myths regarding radial length and height, demonstrating that non-resonant radials can offer superior current uniformity. The construction section provides practical insights into building the vertical, including guying strategies, material selection from scrap pipe, and weatherproofing the relay assembly. It highlights the use of a common mode choke for the relay switching line, measuring approximately 5K ohms on both 160m and 80m, and details the L/C matching network's role in achieving a 50-ohm match at the end of a 300-foot RG-11 run. The author describes a precise VNA-based radial trimming procedure, achieving resonant values within a 3 KHz range. The content emphasizes the practical application of theoretical antenna principles, particularly concerning the interaction between the vertical element, cap hats, and the matching network. It offers a candid assessment of component selection, such as using junkbox parts and acknowledging the need for future upgrades to static drain resistors. The article serves as a comprehensive case study for advanced antenna builders tackling multi-band vertical designs.

Supplier of custom designed, high performance quartz crystal filters for communications receivers and transceivers, for Yaesu Icom Kenwood and Collins radios

Deciphering weak or noisy **CW** (Continuous Wave) signals often presents a challenge for amateur radio operators, particularly in contest environments or during DXpeditions. CWLab04X addresses this by providing a software solution that leverages **DSP** (Digital Signal Processing) capabilities of a soundcard to decode Morse code. It functions as both a receiver and a sender, supporting traditional CW and a unique "CCW" mode designed to enhance copyability of signals struggling against high noise floors. The program offers two installation methods: a Windows-specific installer for straightforward setup or a zipped package compatible with Windows and Linux systems running Wine. Users must first download and review the accompanying PDF documentation, CWLab04.pdf and CWLab04_Hardware.pdf, which detail the software's operation and the necessary soundcard interface circuit. The hardware PDF outlines a direct connection from the receiver audio output to the soundcard input, with optional conversion of the soundcard output for hard-keying or microphone input. CWLab04X is intended as an operational aid rather than a replacement for skilled human copy, particularly highlighting the effectiveness of its CCW mode in adverse signal conditions. The software was last revised in April 2009, with installation requiring the LV Runtime 602.

Very compact and high efficiency antenna ,very low radiation angle even at low height.

Plans and drawings of common amateur radio antennas, like jpoles, copper cactus, super jpole, omnidirectionals and quads

Planning and modelling Delta Loop antennas for all the ham radio HF bands include calculated wire lengths at each mid-band

Who's who in ham radio

Australia's largest online database of VK email & URL's. Home of the AAR Netring and VK Classifieds. Repeater lists, maps and more...

Amplifier keying buffer for ICOM radios & others. Suitable for IC-746 IC-756 PRO and PROII. ACC1 key interface by KK5DR

JaRec is a multi-platform Java application which can be used to control your own CAT enabled transceiver (with support for audio) using a Serial/USB Serial/Bluetooth or network connection. jAReC can act as both a server and as a client. The PocketRxTx Android application can be used as a client securely to connect over the network and control (CAT) your radio transceiver remotely via jAReC server over the Internet or local LAN, with bi-directional audio support.

Linpac is an extensible Linux packet terminal that supports easy access to concurrent connections (streams), PBBS/FBB forwarding, and support for adding external commands

Sigmira is a free Software Defined Radio (SDR) application program that runs on Windows and Linux. It operates with with an external conventional receiver, RFSpace SDR-IQ, RPSpace SDR-14, or SDR-RADIO.com networked receiver

A moxon antenna for 11 meter band, suitable for 27 Mhz and 28 Mhz

Club information, photos, utilities, links and repeater list. In Spanish

Northern NJ's number one club. Weekly swap n shop/net, VE sessions 2nd Monday, Meetings, Second Tuesdays. E-mail us to learn more.

TR4W is a contest logging software package supporting over **180** amateur radio contests. The program operates on Windows 7 to windows 11 operating systems. It supports CW keying via serial port, LPT port, or Winkey, with CW speeds ranging from 1 to **99** WPM. Paddle input via LPT port enables the program to function as a keyer, with paddle input aborting computer-generated CW. PTT support includes programmable delay. The software incorporates automatic super check partial and call checking, along with an expanded .DTA database format for names, QTH, grid, and SS check information. A band map displays color-coded aging data. The software features a built-in telnet DXCluster interface, automatically inserting spots into the band map. It supports RTTY operation via the MMTTY engine and includes WAE QTC support for both European and non-European stations. TR4W provides radio interfacing for Elecraft, Icom, Japan Radio, Kenwood, Ten-Tec, and Yaesu transceivers, utilizing serial or USB-to-serial adapters. Networked multiple-rig operation is supported through a client-server model using TCP/IP protocol. Integrated two-radio support (SO2R) is present. The program includes on-the-fly MP3 recording and log backup to USB drives or selected HDD folders. It uses the standard CTY.DAT file for country and beam heading data.

Professional electronic repairs on old & new CB's, Ham & Marine Radios and more. Low rates, thousands repaired for other shops.

Information on licensing abroad for radio amatuers by OH2MCN, Veikko Komppa

Free software to operate your own Internet remote base ham radio station. Client module allow remote control to your ham radio station and to other radios available on the net, Host module instead allow to publish your radio in the internet.

High gain, good pattern and acceptable bandwidth. These aims can be realized with a radiation-resistance of 25-35Ohms, because the 28-Ohm-feedpoint is very simple to match.

Presents the amateur radio activities and interests of Kote, operating as 4L4KW. The page features a collection of external links relevant to the ham radio community, including references to other callsigns such as 4L1BR, 4L1W, 4L4MM, and 4L/ZL1RS, indicating potential connections or shared interests within the Georgian amateur radio scene. It also lists several well-known ham radio resources like QRZ.com, DXzone.com, and Contesting.com, suggesting an active engagement with DXing and contesting. The resource includes links to major amateur radio equipment manufacturers such as Icom, Yaesu, and Kenwood, which implies an interest in modern transceivers and station setup. The mention of DX-Summit and "fixed activity on Ham bands" further reinforces a focus on making contacts and participating in on-air operations. The page serves as a digital hub for 4L4KW's ham radio presence.

Collection of Yaesu FT-100 comments