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PCB for the DJ9BV Power Meter taken from DUBUS 3/87

conversion of low band VHF Philips FM-828 E band down to 6 metres

Association with free membership for telegraphy lovers across the world.

Battery problem with TS-570

The GM4JMU Shortened 7Mhz Dipole

Calculate power loss depending on coax cable you use

This little project will make a portable 28 Volt DC power supply using two 12 Volt, 4.5 Ah rechargeable lead-acid batteries

This page describes a DC to DC voltage converter, pretty simple, for currents up to 500 mA by sv1bsx

Demonstrates the construction of a _3MA triband mobile antenna_ designed by IZ7DJR, emphasizing a full-size quarter-wave whip for 10 meters. The design incorporates a rapid tilt-down mechanism to facilitate quick changes of loading coils for operation on 15 and 20 meters. This approach aims to minimize losses and enhance efficiency compared to conventional base-loaded mobile antennas. The resource provides specific coil winding data: 22 turns for 15 meters and **37 turns** for 20 meters, both using 1mm wire over an 80mm coil length. The 10-meter band operates without a loading coil, leveraging its full-size design. The author's design prioritizes ease of band switching and improved performance for mobile HF operations, offering a practical alternative to more lossy commercial options.

VectorFox is a software born to incorporate a PC into the fox hunting environment. VectorFox is able to take inputs from up to 5 sources, such as a 2m beam, a 2m signal meter, a TDOA, etc, and display the results on the screen. VectorFox also accepts Agrelo inputs. From these results the operator can choose which indication is best and have a line drawn on the map in the direction of the signal.

DIY voice keyer for your next ham radio contest. An interesting homebew voice keyer project by ON7EQ

Collection of telegraph keys homebrew antenna projects links to radio software

Mailing list post about Yaesu ft-100 knobs

TNC virtual phone modem driver for windows 95, known also as TFSlip95

Balun case construction, tipically to host toroid cores. Size of case depends on power to handle. By DL5DBM

The society representing the interests of Amateur Radio in Northern Peninsular Malaysia

This ia a home built Magnetic loop antenna which was used by G3BGR, indoors on 7,10 and 14Mhz. The basic idea was in Radcom 1986

Where to look on the Bands for SSTV

Description of my mobile HF/VHF station

A 915 MHz four bay j-pole antenna plan

Club Information, Membership roster, officers, meetings, field day and more.

VK2KFJ amatuer radio information pages, including packet radio, six metres, radio modifications, local repeater lists.

by Steve Hicks N5AC and Jim Boehner N2ZZ

Have you problem with your RG cables ? This page describes a smart antenna box using an RG-cathode for 3 antennas. The remote control needs just a simple wire and the GND for remote-control

The _Egyptian Amateurs Radio Association (E-ARA)_ provides a directory of its members, detailing callsigns such as SU1AL and SU1ER, along with their full names and QSL routing instructions. Each entry typically includes a postal box or street address in cities like Giza, Cairo, and Port Said, facilitating direct QSL card exchange. Specific entries indicate QSL via home call for operators like SU1BH (A71BH) and SU1DZ (9K2DZ), while others, such as SU1MR and SU1SR, route QSLs through SU1ER. The list also contains details for operators with international home calls, including SU2RS, who QSLs via OE6EEG. This resource serves as a basic callbook for the Egyptian amateur radio community, offering essential contact information for local and international hams seeking to confirm contacts or establish communication.

W5PC is an ARRL Special Services Club, ARES/RACES/SKYWARN in Weatherford, Parker County, TX

ARRL Laboratory Expanded Test-Result Report Kenwood TS-570D

Radio Club ON4GDV, home page of Gang De Verviers, located in Belgium

One another useful Table for the HAM's practice.

Promoting interest in DX to the state of Arkansas and the world.

ON7YD slow CW and DFCW TX program for Windows, works with Argo. By Rik Strobbe

40 meters band 5 watts transmitter, uses a 6L6 with a 6X5 rectifier and a 0D3 voltage regulator tube on the screen.

WI ham club partecipate in Field Day, sponsers an annual Swapfest held in August, and provides various repeaters.

The South Brevard Amateur Radio Club is based in the Melbourne, Florida area and provides volunteer communications services to the public and provides a common organization for amateur radio operators in the south Brevard County area to operate under.

Here are some lengths and spacings for various direct connect beams.

In this article, the author discusses the importance of good transformers for Beverages, especially for common-mode isolation. The author recommends #43 ferrite for the transformer, and provides the turns required for different core types. The author also recommends using lower permeability ferrites for better performance at lower frequencies.

An interesting project of the popular IW3HEV antenna analyzer in and embedded solution by PA3CKR.

This map is done by Mike, KB8SSH

KC9L PSK is a free PSK31 program based on AE4JY’s PSKCore DLL. It supports 5 RX channels, full duplex operation, and more. Even if it's development has been dismissed, is a good tool for windows 95/98 pc.

SSTV pictures received from MIR via Slow Scan TV, by WB8ERJ Mike.

Modification to connect a frequency counter to a MFJ-9406 50 MHz transceiver by ON6MU

Schematic anc PCB for a fox hunting receiver for 80 meters band

Accessing local public service communications often requires specific frequency data, and this resource provides extensive scanner frequency lists for the Greater Cleveland area. Originally compiled by Russell Imburgia, _N8RI_, these compilations were previously hosted on the now-defunct Greater Cleveland Hamnet BBS. The data is presented in two distinct formats: one sorted alphabetically by city and another organized numerically by frequency, allowing users to quickly locate specific channels based on their preferred lookup method. These lists are noted for their thoroughness in covering local public safety, business, and utility communications within the region. While the primary lists are copyrighted by N8RI, permission is granted for non-commercial reproduction, provided the copyright notice remains intact. The page also directs users to an external frequency database maintained by Jon Anhold, _N8USK_, offering an additional avenue for frequency information.

SV2AEL QSLs and flags gallery, from almosto every country, include country falg

Hidden transmitter hunting, often called fox hunting or Amateur Radio Direction Finding (_ARDF_), presents a unique challenge for radio amateurs. This resource details the _PicCon_ controller, a specialized device designed to automate the transmission of signals for such events. It integrates with a standard radio transceiver, functioning similarly to a packet radio TNC, by controlling the Push-To-Talk (PTT) line and injecting audio tones or modulated CW Morse code into the microphone input. The _PicCon_ unit is field-programmable using DTMF tones received via the radio, storing all settings in EEPROM for power-off retention. Its compact design and low power consumption (a few milliamps from a 7-35VDC source) make it suitable for remote deployment. An onboard LED indicates operational status, and a push-button allows manual start/stop of transmissions without DTMF. Typically supplied as a kit, _PicCon_ includes a PCB, components, and a comprehensive manual (available in HTML, RTF, and PDF formats). The kit provides a six-conductor interface cable, but users must supply radio and power plugs due to varied configurations. Byon, _N6BG_, developed this controller, which is available from the Byonics website.

A 4 AMP / 18V regulated power supply schematic, designed by _ON6MU_, provides a detailed circuit diagram for constructing a robust power source. The design focuses on delivering a stable 18-volt output at up to 4 amperes, crucial for powering various amateur radio equipment. This resource presents a clear visual representation of component interconnections, including rectifiers, filter capacitors, and voltage regulation stages, essential for DIY enthusiasts building their shack infrastructure. The schematic's clarity facilitates understanding the power flow and component roles within the circuit. This circuit design offers a practical solution for hams needing a reliable 18V supply, potentially useful for driving specific transceivers, amplifiers, or accessory circuits. While specific performance measurements or comparisons to other designs are not detailed, the schematic itself serves as a foundational blueprint. Builders can adapt or modify the _power supply_ to suit their particular needs, such as integrating overcurrent protection or fine-tuning the output voltage with adjustable regulators. The straightforward presentation makes it accessible for those with basic electronics knowledge to assemble and troubleshoot.

Tips to homebrew your own HF traps using aluminium wire and doorknob capacitor

The resource presents a detailed schematic for constructing a dual-band vertical antenna, specifically designed for operation on the 2-meter and 70-centimeter amateur radio bands. It illustrates the physical layout, critical dimensions, and component placement necessary for successful replication. Key elements such as the radiating elements, phasing sections, and feed point are clearly depicted, providing a visual guide for radio amateurs undertaking a homebrew antenna project. The diagram specifies the lengths for the VHF and UHF sections, indicating how these elements are integrated to achieve dual-band functionality from a single coaxial feedline. It also implies the use of common materials readily available to most experimenters, focusing on simplicity and effectiveness in its design. The visual format of a GIF image ensures direct access to the construction details without requiring extensive textual interpretation. This schematic serves as a practical reference for hams interested in building a compact, efficient vertical antenna for local and regional FM communications, offering a proven design for immediate implementation.

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General ham radio related items