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Antennas : 12M
  • Trapped Dipole for 12 and 17 Meters - A small sized and very cheap antenna project that allow you to work on WARC bands with a total gain very close to the dipole in both bands. On 12 meters is a normal dipole, while on 17 is a trapped dipole. Article in Italia
    [ Hits: 882 | Votes: 1 | Rating: 1 ]
Antennas : Collinear
  • 7dB VHF Collinear Antenna - This project is about a cheap way of building a colinear antenna for VHF 145MHz, and having about 10dB more gain than that little 1/4-wave magmount
    [ Hits: 4739 | Votes: 15 | Rating: 6.41 ]
Antennas : Masts and mounts
  • A Cheap Portable Mast Support - A homemade simple and inexpensive portable antenna support, handy for quick trips to the field and other portable operations
    [ Hits: 231 | Votes: 0 | Rating: 0 ]
Antennas : Multiband
  • 5 Band Telescopic Vertical Antenna - 5 Band 1/4 wave Telescopic Antenna. The 20m to 10m, antenna is simple and cheap to make, and has a performance that matches commercial antennas but at cost considerably lower. The design was purposely based on a telescoping fibre glass fishing rod as this allows it to be easily stowed away in the car.
    [ Hits: 3601 | Votes: 3 | Rating: 9.33 ]
Antennas : NVIS
  • DIY NVIS Antenna Using a Mag Mount - NVIS antennas, also known as Near Incident Vertical Skywave antennas have a high angle of radiation. Something on the order of 60 degrees, to straight up to 90 degrees. A portable, easy to setup and cheap nvis antenna project.
    [ Hits: 643 | Votes: 4 | Rating: 5 ]
Antennas : Satellite Antennas : Tuners
  • An Automatic Antenna Tuner - An homemade antenna tuner project that should be small, easy to build and cheap. This automatic antenna tuner can work as locale or as remote. The tuner has EEPROM memory for store settings for faster tunning and four interfaces
    [ Hits: 492 | Votes: 3 | Rating: 9 ]
Antennas : VHF UHF
  • Cheap HDTV Antenna - A cheap and easy HDTV Yagi Antenna that also work well with the UHF low-power analog and translator stations
    [ Hits: 1020 | Votes: 3 | Rating: 5.67 ]
Antennas : Vertical
  • Multiband wire vertical - An easy to make, cheap, no trap, multiband wire vertical antenna by PA1M
    [ Hits: 1464 | Votes: 1 | Rating: 4 ]
  • Hustler 6BTV mod - 6BTV (or 5BTV or 4BTV) mod for 12 and 17 meter bands, how to make a 7BTV or 8BTV or 9BTV, easy and cheap
    [ Hits: 754 | Votes: 0 | Rating: 0 ]
  • 5 Band Pipe Vertical Antenna - A simple, cheap and easy to build 26 feet long vertical antenna that works DX on 20 - 10 meters including WARC Bands, it is designed for portability for field days, camping, or permanent installation, cost, and to achieve at least 1/2 wavelength on the WARC bands.
    [ Hits: 549 | Votes: 5 | Rating: 6.2 ]
Operating Modes : JT65
  • Receiving JT65 with RTL-SDR - How to receive JT-65 signals using a cheap RTL-SDR dongle with the 820T2 tuner chip
    [ Hits: 832 | Votes: 1 | Rating: 7 ]
Operating Modes : Remote Operations
  • Remote CW Key Project - A simple DIY project for a remote cw key connected to your Flex Rig (actually it can be any other rig). On the remote side it uses and Arduino Uno board and a cheap HanRun Enc28J60 ethernet shield. On the local side it uses a key (better a keyer) connected to a serial port of your pc
    [ Hits: 121 | Votes: 0 | Rating: 0 ]
Technical Reference : Amplifiers : HF Amplifiers
  • A simple 50W RF Power Amplifier - A simple RF power amplifier initially designed for 40 meter band can work on 10 15 20 40 80 meters
    [ Hits: 1630 | Votes: 1 | Rating: 8 ]
Technical Reference : Arduino : Morse Code
  • A Remote Morse Key - A simple DIY project to have a remote cw key connected to your Rig. On the remote side it uses and Arduino Uno board and a cheap HanRun Enc28J60 ethernet shield. On the local side it uses a Morse Key connected to a serial port.
    [ Hits: 438 | Votes: 1 | Rating: 1 ]
Technical Reference : Preamplifiers
  • 432MHz Low Noise Preamp - An easy to build with a cheap HEMT FET Transistor Low noise preamplifier with FHX35LG based on JH0WJF design
    [ Hits: 763 | Votes: 1 | Rating: 10 ]
Technical Reference : Raspberry Pi
  • Sending and receiving Laser CW signals with a Raspberry Pi - Sending and receiving text with Morse code light pulses across the room is a fun and cheap project you can do on a Raspberry Pi or Arduino or any other microcontroller. This post explains how I did it, and how you can do it too.
    [ Hits: 290 | Votes: 0 | Rating: 0 ]
  • WSPR monitoring with RTL-SDR and Raspberry Pi - The goal of this interesting project is to monitor a particular set of frequencies for a set period of time. In this article your will find instructions to build and operate an all-band WSPR node using cheap hardware and free software. At the end of this you'll have a Raspberry Pi, connected to an RTL-SDR dongle that monitors all of the WSPR frequencies rotating randomly every 15 minutes.
    [ Hits: 201 | Votes: 0 | Rating: 0 ]
Technical Reference : Repeater : Repeater Maintenance
  • Repeater Temperature Monitor with Raspberry Pi - A simple and cheap solution to monitor temperature of your repeater implementing a Raspberry Pi device with a set of popular tools made in python a database and RRD tool
    [ Hits: 173 | Votes: 0 | Rating: 0 ]

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