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Amateur Radio, SkyWarn, RACES, ARES, and more -
FreeDV plus Video adds simultaneous digital voice (FreeDV) to ZL2AFP's OFDM TV (see OFDM TV page listed under Software/SSTV and FreeDV page listed under Software/Digital Voice). An older version of OFDM TV is used, modified for compatibility with FreeDV. The video is 1 frame/sec, 36-lines, with full color. Total bandwidth is 3.5 kHz. -
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Kenwood TS-690S Preventive Maintenance -
Sound card based multimeter -
The W1HP Philips Amateur Radio Club, originally the Hewlett-Packard ARC, has a history rooted in Andover, Massachusetts, as an employer-sponsored club. It evolved from a "full-service" club to primarily a Field Day club, maintaining its focus on this major annual effort. The club has participated in Field Day under various configurations, including W1HP/1B in Arizona, and has partnered with K1KKM and utilized GOTA stations like K1KKM and KD1NA. Recent Field Day operations reflect adaptations to changing circumstances, with members operating individually due to COVID-19 and later under "new" ARRL rules, sometimes as a "distributed" club. The club's constitution is also referenced, providing insight into its foundational structure. This page is maintained by W1DYJ, with a last update noted as 9 December 2025. -
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What sort of batteries when operating mobile, choosing proper battery technology -
Cary Amateur Radio Club -
Beacon list for 10 meters band maintained by DL7JV -
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Active on HF all bands, VHF - SSB - MS. Hope to work you on one of the bands. -
The Icom IC-7600 compared to other Icom HF radios , like IC-756Pro III, IC-7700 and IC-7800 by VA7OJ/AB4OJ -
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CT1BWW portugeses Faros Awards -
An ARRL affiliated club -
Amateur radio station from Capri island, Italy -
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A great and efficient monoband VHF portable antenna. The article consist of two version of a 12.5 Ohm 3 elements yagi beam antenna plans for the two meter band, a full sized and a shortened version expecially designed for the SSB and CW on 144 MHz. -
The correct procedure for measuring SSB PEP (Peak Envelope Power), using an oscilloscope with a vertical bandwidth of at least 20 MHz, or a monitor scope. -
Observing how fractal antennas might exhibit characteristics that are correlated to their form by kb7qhc -
The Waterville Area Wireless Association was founded in 1957 -
The Delmarva Amateur Radio Club is located in Salisbury, Maryland -
9M6MU Alfons details his family's efforts to establish an independent, self-sufficient home at Eagle Plateau in Borneo, a 50-acre highland property. The resource highlights their integration of **solar photovoltaic panels** for power generation, alongside managing water supplies, organic gardens, and fruit trees. It covers the practical challenges and rewards of living off-grid, including maintaining power generators and addressing infrastructure needs, all while pursuing the hobby of amateur radio. The narrative emphasizes a holistic approach to healthy living and nature conservation, reflecting the family's aspirations for an ideal ham world. Alfons and his XYL Doris share their experiences in building shelter and antenna farms, showcasing their dedication to independence and sustainable practices away from the conventional grid. The site also references the Hillview Gardens Amateur Radio Club, suggesting community involvement. -
XQ3SA personal website and Chilean Internet Callbook. -
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Baccalieu amateur radio klub inc. is located in carbonear, newfoundland -
Amateur Radio Station K7GSE, Telegraph & keys Collection -
Personal web site WebAPRS and more, in spanish. -
Tiny Trak is a simple choice for tracking, simply by using a usual VHF and TinyTrak as APRS modem. -
Issued by the Irish Radio Transmitters Society -
An exaustive document on frequency multipliers with a particular attention on ways to generate high frequency signals for microwave -
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SARA, the Schuylkill Amateur Repeater Association located in central-eastern PA in Schuylkill County. -
Dedicated to:jnos tcp-ip packet radio -
News from Pueblo West Amateur Radio Club, Pueblo West, Colorado -
Lockheed martin recreation association amateur radio club -
Official web site of the Alaska QRP Club The AK/QRP Club is dedicated to the enjoyment of low power Amateur Radio operations. -
Six meters dxing pages and shack review -
Peace country amateur radio club, as well as links to other sites -
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Constructing a high-performance RF spectrum analyzer up to 1000 MHz requires careful attention to component selection, shielding, and circuit isolation. This resource details a project that improves upon the _Spectrum Analyzer for the Radio Amateur_ design by Wes Hayward (W7ZOI) and Terry White (K7TAU), incorporating ideas from Scotty Sprowls' project, particularly his 1013.3 MHz IF bandpass cavity filter. The analyzer utilizes a Mini-Circuits SRA-11 mixer with a sweeping local oscillator from 1013 to 2013 MHz, feeding into a 4-pole copper pipe cavity filter. The design employs a second SRA-11 mixer with a fixed 1024 MHz LO to produce a 10.7 MHz final IF. This signal then passes through narrowband resolution filters and is processed by Analog Devices AD603 and AD8307 ICs for IF amplification and logarithmic detection, driving an oscilloscope in X/Y mode. The project emphasizes modular construction, using salvaged components and double-sided FR4 material for PCBs, with critical notes on minimizing spurious images through effective shielding and proper voltage regulation for each module. Key components include a Z-Communications V585ME48 VCO for the first LO and a Z-Comm V583ME01 VCO controlled by a Motorola MC145151 PLL for the second LO. An optional Hittite HMC307 step attenuator and K&L 5L121-1000/T5000-O/O low-pass filter manage RF input. Tuning procedures for the 10.7 MHz IF resolution filter are also detailed, showing before-and-after spectrum views.
