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G3WZT design for a single stage bi-polar 100-150W Linear Power Amplifier for the 6M band. -
3 Band vertical Marconi-antenna for the bands 40, 80, 160 meters with a ground net of wires as radials. -
Antennas and homebrew ancilliary equipment -
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A micro processor interface that converts PC keyboard code into Morse code -
The Thracian Rose Club has been created in the Roses' City Kazanlak (Bulgaria) in 1993. Its main goal is to promote contacts within the radio community members (HAM, CB and SWL). -
Amateur radio club serving NEW YORK area. Club has fully equipped station,holds two hamfests a year,ve exam ,field day and contesting. -
Contest adjudication software scores Cabrillo logs. Auto evaluates up to 2000 logs with duping, claimed score, actual score, cross checking, N-QSO rule, 5-min delta QSO rule. Support including code changes, non-scoring logs troubleshoot and summary output requests. -
A schematic design of the W3DZZ antenna in portugues with description of trap building -
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Ham radio software downloads including sstv, logging and morse code -
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QSL extra offers QSL informations for every ardent dxer, with over 30.000 entries. -
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A multi band version of the EH antenna by Emilio S. Campus IS0IEK -
Two 50 Mhz amplifiers and antenna switch -
1.2-30V 1.5A variable regulated power supply -
The simple dipole is perhaps the best antenna for consistent performance. Basic page on dipoles by G3PTO -
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How to setup a Remote control ham radio station with Yaesu FT-8x7 radios via LAN or via internet. -
How to use packet radio using the WindowsCE operating system -
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Presents the detailed construction of the _FLA25HV_ antenna, a specialized array optimized for Earth-Moon-Earth (EME) communications on the 2-meter band. This resource provides schematics and practical insights into building a high-gain antenna system capable of reflecting signals off the lunar surface, a challenging but rewarding aspect of amateur radio. It covers the mechanical and electrical considerations essential for achieving the precise pointing and signal strength required for successful moonbounce contacts, often yielding **20 dB** or more gain. Amateur radio operators pursuing EME operations require robust antenna systems and precise tracking capabilities. The FLA25HV design addresses these needs by focusing on element spacing, impedance matching, and structural integrity to withstand environmental factors while maintaining critical alignment for lunar reflections. Such systems are crucial for making contacts over distances exceeding **768,000 km**. This personal page serves as a practical guide for hams interested in constructing their own EME arrays, offering a glimpse into the technical dedication involved in pushing the boundaries of VHF/UHF propagation. -
VHF/UHF DX site showing latest propagation, software, radio dealers, awards, maps etc. -
Information on how to access the IRC #CQDX chat room for DXers. Also contains a live feed of DX spots directly from DX Summit. -
Based on DL6UW Yagi antenna's design-formula The forward gain is 13.6 dBi (about 11.5 dBd) and it's pretty small, about 1,5 m in length -
Design that can be mounted on a mast underneath an existing beam. -
A small portable antenna tuner for HF and VHF bands by ON6MU -
Search for your call in many of the logs hosted online, also contains links to other logs on the internet. -
Satellite Tracking/Orbital Prediction Program an open-source, multi-user satellite tracking and orbital prediction program written under the Linux operating system by John A. Magliacane, KD2BD. PREDICT is free software -
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. -
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Icom IC-706 Extended receing mod From OH6LGM -
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. -
Here is an antenna for the nineties. It's strong, computer designed, and has lots of gain. It is a full size, four element beam on 10, and three elements on 15 meters -
Pictures and dimensions of and HB9MTN DDRR antenna for 6 meters band -
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How to easy connect two Pc together with a Ethernet Lan -
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The "Tiny 2" is a great little 2 meter beam. It has some really interesting properties and it is a fantastic first time antenna project for the beginner. -
Lots of projects and introductions to RDF and T Hunting -
