circuit

circuit

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• Squarooka Antenna - squared bazooka for 2 meters band - Sort of similar to the one of the 6m omni. Instead of using twin-lead, this design makes use of a more or less regular double bazooka antenna (coaxial dipole). Your attention shall be drawn to the available standart literature, such as Rothammel. In order to "compute" the dimension, Karl Rothammel mentioned that the total length of the dipole shall be 95% of the free-space wavelength. The short-circuit bridges (closing the folded dipole) are to be placed at a distance-fraction being equal to the velocity factor of the coax cable used, which will be 66% using RG-58 or RG174.
  [ Hits: 356 | Votes: 0 | Rating: 0 ]

• A very efficient half size 40 meter Vertical Antenna - A vertical antenna project for the 7MHz made with some spare parts. Based on a broken 20 foot fishing pole, it is based on a good ground system made with radials and a capacitive hat done to increase the global radiation resistance of the antenna. A custom loading coil is also included in this project to perfectly tune the antenna to the CW portion of the 40 meters band.
  [ Hits: 736 | Votes: 4 | Rating: 8.5 ]

• Trapped vertical Antenna - This antenna is an omnidirectional and multiband and it is well suited for DX enthusiasts with limited space. Each of the parallel circuits (trap) behaves like an isolator on its resonant frequency.
  [ Hits: 356 | Votes: 7 | Rating: 2.71 ]

• Notable Patents on Antenna Design - Patents of most popular antenna models including Zeppelin Antenna, Beverage Antenna , Franklin Antenna , Yagi-Uda Antenna , Sterba Antenna , Rhombic Antenna , Turnstile Antenna , Folded Dipole Antenna , Coaxial Antenna , Slot Antenna , Discone Antenna , Quad Antenna Element , Log Periodic Antenna , Swiss Quad Antenna
  [ Hits: 287 | Votes: 0 | Rating: 0 ]

• Proppy HF Circuit Prediction: Space Weather - Current space weather condition gauges, with solar indices taken from the latest WWV report
  [ Hits: 137 | Votes: 2 | Rating: 9.5 ]

• Yaesu FT-1000-D RS 232 CAT interface - Schematic diagram circuit to build a RS232 serial interface for the Yaesu FT 1000D, works also as CW Keyer control with Log-EQF software. May be used with other Yaesu HF Transceivers.
  [ Hits: 220 | Votes: 1 | Rating: 1 ]

• Baofeng UV-5 Programming Cable - Baofeng UV-5R uses RS232 to communicate or programming with the PC software and you can make your own programming cable with a few components.
  [ Hits: 439 | Votes: 2 | Rating: 7.5 ]

• mini Ring-Core-Calculator - Calculate windings on ferrite cores - The program can be used to calculate inductors (coils) and their number of turns on ferrite cores, ferrite shells and air coils. These can be used for baluns, Ununs, bandpass filters, low pass filters, resonant circuits, and more. The technical specifications of the cores are already integrated in the program. Application is free and runs on Windows 32 bit versions only. To make it run on Windows 10 64 bit need to be unzipped in a single folder.
  [ Hits: 398 | Votes: 1 | Rating: 1 ]
• ZenitPCB - An excellent tool to create, design printed circuit boards in a simple and easy to learn way. ZenitPCB is free for personal and amateur use, limited to 1000 pins, that is more than enought for any amateur radio electronic project
  [ Hits: 142 | Votes: 1 | Rating: 8 ]
• TinyCAD - TinyCAD is a an open source program for drawing circuit diagrams which runs under Windows. TinyCAD is a program for drawing electrical circuit diagrams commonly known as schematic drawings. It supports standard and custom symbol libraries. It supports PCB layout programs with several netlist formats and can also produce SPICE simulation netlists.
  [ Hits: 134 | Votes: 1 | Rating: 10 ]
• LogiSim - Logic Circuit Simulator - Logisim is an educational tool for designing and simulating digital logic circuits. With its simple toolbar interface and simulation of circuits as you build them, it is simple enough to facilitate learning the most basic concepts related to logic circuits.
  [ Hits: 128 | Votes: 0 | Rating: 0 ]
• Fritzing - Fritzing is for amateur circuit designers, enthusiasts and hobbyists to build their own design and develop their own projects. Fritzing offers a rich user interface. The source code of Fritzing is available on our Github. Fritzing is available in several languages and runs on windows, mac and linux.
  [ Hits: 128 | Votes: 1 | Rating: 9 ]
• PCB gEDA - PCB is an interactive printed circuit board editor for Unix, Linux, Windows, and Mac systems. This Software runs across multiple platforms such as Unix, Linux, Windows as well as Mac systems. This Tool is widely used for electronics as well as electrical circuit designing that comes with schematic capture. PCB offers high end features such as an autorouter and trace optimizer which can tremendously reduce layout time.
  [ Hits: 104 | Votes: 0 | Rating: 0 ]

• 70cm Beacon - PLL synthesized 70cm CW beacon exciter. The exciter is built arround a slightly more advanced ADF-4351 single chip PLL synthesizer rather then (among amateurs) more popular Si-570 or Si-5351 integrated circuits. The exciter is capable of providing up to 250 mW of RF output power,
  [ Hits: 130 | Votes: 1 | Rating: 10 ]

• Frequency counter project - This project includes quite a number of useful testing features which were very useful when building other projects. Almost all the components used to construct this frequency counter were scrounged from old circuit boards and junk equipment.
  [ Hits: 128 | Votes: 0 | Rating: 0 ]

• PT40 7 MHz Transceiver by AA3SJ - Home made 40 meter transceiver project. The receiver is a Progressive Receiver with a few modifications. The Transmitter is a modified MFJ Cub circuit. Includes schematic and circuit diagrams for Receive Input Filter, 3-Pole 500 Hz Cohn Filter and 7 MHz Double Tuned Bandpass Filter
  [ Hits: 163 | Votes: 0 | Rating: 0 ]

• DL4YHF PIC-Keyer - This page describes a printed circuit board that you may use to build a QRP keyer.
  [ Hits: 127 | Votes: 1 | Rating: 7 ]
• Juma Keyer1 - Miniature PIC microcontroller based keyer kit with convenient modes. The kit includes PCB, componets, knob and ready programmed PIC microcontroller. Author make available from his web site Circuit diagram, Component layout,List of components and downloadable Software
  [ Hits: 101 | Votes: 0 | Rating: 0 ]

• VK5TM Noise Canceller - Noise Canceller kit originally developed about 1989 by G4WMX and GW3DIX and improved by DK9NL and DG0KW.The VK5TM Noise Canceller is another version of the design, with the HF Vox circuit removed and a couple of other minor changes, including the use of SMD JFETs and a double-sided pcb.
  [ Hits: 476 | Votes: 1 | Rating: 10 ]

• Behringer HA400 Headphone Amplifier and RFI - Removing disturbing RFI from the Behringer HA400 Headphone Amplifier, using ferrites and capacitors soldered in the main circuit board of the small amplifier.
  [ Hits: 121 | Votes: 2 | Rating: 5.5 ]

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