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• Mini Whip - Active HF Antenna  ^new - The author investigated electric field antennas and achieved promising results with a shortened active whip antenna (30 cm). The findings suggest that at LF, active whips function primarily through electric field capacitance coupling.
  [ Hits: 63 | Votes: 1 | Rating: 10 ]

• The Reversible BOGs - The author struggled with receiving antennas on his property. After a standard Beverage on Ground (BOG) antenna failed, he built a Reverse Beverage on Ground (RBOG) using telephone cable. He details construction and testing, finding the RBOG outperformed other antennas in noise level, signal strength, and reception pattern. Software modeling helped optimize the antenna length. Unfortunately, the project ended when telephone cable from the second RBOG was stolen.
  [ Hits: 22 | Votes: 0 | Rating: 0 ]

• Mid Sussex Amateur Radio Society - Mid Sussex ARS is an RSGB-affiliated club and meets at its headquarters in Burgess Hill on the 2nd and 4th Friday of each month. They organize various activities ranging from talks by members or guest speakers, evenings on the air using their shack's latest SDR equipment, training evenings and used equipment sales. As well as scheduled club nights, they run many outdoor activities throughout the year, including direction-finding contests, town days, social evenings and Special Event Stations. They even have their own free online training academy!
  [ Hits: 12 | Votes: 0 | Rating: 0 ]

• Schoharie County Amateur Radio Association - The Schoharie County Amateur Radio Association (SCARA) was established by a group of Schoharie County amateurs, along with a few from just over the County line in 1946. That date is based on the best we can find from old club records and recall of conversations with some of the original group, now all SK.
  [ Hits: 9 | Votes: 0 | Rating: 0 ]

• Short introduction to D-STAR - On this page, you will find some basic information about D-Star, and some handy information for those in and around Essex UK
  [ Hits: 54 | Votes: 0 | Rating: 0 ]

• HF Radio Propagation Forecast  ^updated - This page offers radio amateurs (experienced and beginners) a useful overview and tutorials on HF propagation conditions. Here you will find basic and advanced explanations, as well as practical methods, charts, maps, models, real-time measurements, assessments, comparisons, references, and an index.
  [ Hits: 359 | Votes: 19 | Rating: 8.79 ]

• Yaesu FT-817 Audio Enhancement: Heathkit-inspired Homebrew Project - Inspired by Heathkit, author aimed to enhance his Yaesu FT-817 with audio and RF processing. Design goals included a compact enclosure, PCB simplicity, matching jacks, a visual meter, and a built-in signal generator. Despite challenges in finding a suitable compressor IC for a 5V DC mic jack, he chose the Analog Devices SSM2165/2166 series. Prototyping with a solderless breadboard, author planned a PCB layout for its versatile performance in communication use.
  [ Hits: 80 | Votes: 1 | Rating: 2 ]

• Resistor combination finder - If you need a non-standard resistor value you could probably realize a close match using two resistor. If you use two resistor in series it is quite easy to figure out which values give the best match; on the other hand, using a parallel connection it is not so easy (at least for me) to find a good combination. This resistor calculation tool shows which combinations of two resistors (series or parallel) gives a match better than the closest standard value, for the E12 (10%), E24 (5%) and E96 (1%) series.
  [ Hits: 56 | Votes: 1 | Rating: 10 ]

• Stingray Marine Transceiver - Recently, at the Ballarat Hamfest, the author acquired an old Marine transceiver for just $10, charmed by its sturdy construction and waterproofing. Made by Findlay Communications in Sydney, this crystal-controlled transceiver had been dormant but was reinvigorated with minor fixes. A manual was sourced, and further repairs were made, including an ingenious crystal oscillator replacement using an Si5351a controlled by an Arduino. The refurbished radio, complete with a fresh coat of paint and added customizations, is now operational for 160m AM and 30m SSB. A successful and cost-effective restoration.
  [ Hits: 61 | Votes: 0 | Rating: 0 ]

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