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Antennas : 20M- Directional Helical Antenna
- This antenna is intended for the 20-meter Band.
There are two Voltage Fed Helical Dipoles, made with 2 slinky that fed with phase shift in 90 degree
[ Hits: 1083 | Votes: 1 | Rating: 8 ]
- UHF Dual Rectangle Antenna
- The antenna described here is a direct-connect dual-rectangle beam for use on 70 cm between 440 and 450 MHz
[ Hits: 953 | Votes: 3 | Rating: 6 ]
- How to make a HB9CV
- The HB9CV is a well known two element antenna of a directional beam type with a forward gain of 4 to 5 dBd. This one is for two metres but it can be scaled, from the dimensions in the diagram, for other bands I have also made them for four and six metres
[ Hits: 1467 | Votes: 9 | Rating: 4.45 ]
- 2m Halo Antenna
- Construction and analysis of a low cost omnidirectional horizontally polarized antenna for 144 MHz, including notes on halo antenna stacking
[ Hits: 1011 | Votes: 9 | Rating: 5.34 ]
- Build your own Hexagonal Beam
- A web site dedicated to hex beam homebrewing. The hexagonal beam has become a wildly popular antenna. It is a directional antenna that provides great performance and does not require a full scale, expensive tower.
[ Hits: 1173 | Votes: 2 | Rating: 6.5 ]
- Curtain Antenna
- An antenna for shortwave radio broadcasting consisting of rows and columns of dipoles, is a high gain directional antenna, designed for medium and long range communications.
[ Hits: 854 | Votes: 0 | Rating: 0 ]
- Antenna Basics : Directional Antennas
- An article describing basic concepts of antenna radiation, and in particular directional antennas like Yagi antennas or Quad antennas and how they determine the direction or signals.
[ Hits: 346 | Votes: 1 | Rating: 2 ]
- The Turnstile antenna
- An omnidirectional and horizontally polarized VHF antenna by EA4EOZ
[ Hits: 914 | Votes: 4 | Rating: 3.25 ]
- Manpack Communications
- A complete bi-directional APRS messaging station, made up of a Byonics TT4 with the companion display, Byonics GPS5 receiver, compact keyboard, Baofeng UV-3R+ with a telescopic whip antenna by VE6AB
[ Hits: 620 | Votes: 2 | Rating: 5.5 ]
- Peilsport.de
- ARDF Peilgruppe Neanderal Germany - Radio Direction Finding Event
[ Hits: 152 | Votes: 0 | Rating: 0 ]
- Fast Charge your MFJ-259B Internal Batteries
- Modify MFJ-259B to connect an external fast charger to the batteries directly
[ Hits: 581 | Votes: 2 | Rating: 10 ]
- Shortwave.am - Shortwave Schedules
- Shortwave Radio Schedules from Eibi/AOKI combined lists. Includes Google maps showing beam directions and long paths.
[ Hits: 1653 | Votes: 2 | Rating: 3 ]
- Terminator for Android
- Android app by VE3VN that show view of night, day and terminator around the globe. This gives a strong hint of which bands and compass directions to focus on for best results.
[ Hits: 752 | Votes: 1 | Rating: 10 ]
- RepeaterBook
- Enables every Ham to easily find repeaters across the the World, USA, Canada, Mexico and over 35 other countries, for free and without a network connection using the RepeaterBook Directory.
[ Hits: 468 | Votes: 2 | Rating: 9 ]
- DX Alert
- You can set up DX Cluster alerts and let the DX Alert server monitor the cluster for you. So your device is not directly connected to the DX Cluster. When a spot that matches an alarm is seen a notification appears on your android device.
[ Hits: 472 | Votes: 2 | Rating: 9 ]
- JMSK
- JMSK is a software modem that implements a good coherent MSK demodulator that has performance comparable to BPSK. Signals are demodulated from the soundcard. Modulated signals can be routed through the soundcard or to an external device such as a DDS module for direct RF modulation. The advantage of MSK compared to PSK is that non linear amplifiers can be used and has a faster roll off. It is an open source cross-platform program written in C++ Qt.
[ Hits: 369 | Votes: 2 | Rating: 5.5 ]
- DirectDirt
- The Information Source For Makers, Experimenters, DIY, Home Brewers, Restorers, and Amateur Radio Operators
[ Hits: 499 | Votes: 4 | Rating: 10 ]
- U310 FET preamplifier
- Extremely reliable FET preamplifier can handle several watts directly into either the input or the output without failure
[ Hits: 1049 | Votes: 2 | Rating: 9 ]
- SDR Receiver using a Tube
- The build was an experiment to see if a tube receiver could be stable enough to receive digital shortwave radio broadcasts.
The tube acts as both an oscillator and mixer, so the receiver is a type of direct conversion receiver.
[ Hits: 230 | Votes: 1 | Rating: 10 ]
- High Performance Communication Receiver
- The original article of the progressive system, composed by a direct conversion receiver and multiband superetherodyne by W7ZOI and K5IRK
[ Hits: 1145 | Votes: 6 | Rating: 9.17 ]
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