double d

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Double Quad Antenna for 24cm - An easy to build double quad antenna that can be used as an antenna for beginners, it features a wide angle providing a generous alignment.
[ Hits: 136 | Votes: 1 | Rating: 10 ]

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 ]

Double BiQuad Antenna Calculator - Online antenna calculator for homemade double biquad antenna for UMTS 3G 4G WiMAX WiFi frequencies. Article includes also a simple biquad antenna for 4g
[ Hits: 159 | Votes: 2 | Rating: 5.5 ]

Double Bazooka Antenna - Double Bazooka Antenna, a simple coax based and broad band antenna you can easily build
[ Hits: 1611 | Votes: 10 | Rating: 8.1 ]
KC0KJF Doble Bazooka - The Double Bazooka Dipole is a very efficient single band antenna which is very quite,and does not require the use of a balun. This antenna consists of coax (RG58) with the shield split at the center and the feedline attached to the open ends.
[ Hits: 988 | Votes: 2 | Rating: 3 ]
Antenne double-bazooka - A page in french dedicated to the double bazooka antenna, with a short history of this antenna model and main characteristics including a comparison versus the dipole antenna and formulas to determine elements size.
[ Hits: 1080 | Votes: 12 | Rating: 5.58 ]
Double Bazooka - Build a double bazooka antenna. This website offers pictures and diagrams of bazooka antennas for all Bands, from 6m to 160m
[ Hits: 440 | Votes: 7 | Rating: 4.86 ]

Speaker Wire Doublet Antenna - A portable wire antenna for the HF bands, made with a common speaker wire. In its natural form, the speaker wire acts as parallel feed line coming up to the bottom of the PVC feed point. From there, it's split into two wires, one heading out each side of the PVC tee.
[ Hits: 395 | Votes: 4 | Rating: 9 ]

The BikeLoop Antenna for VLF - BIKELOOP is a VLF home made antenna. This antenna is a double magnetic loop composed by two orthogonal loops. This document describe how the prototype was built, the purpose is to give some construction hints to people who wants to try this kind of antenna. Mathematical and electrical details are described as well
[ Hits: 232 | Votes: 0 | Rating: 0 ]

Horizontal Loop Antenna Experiments - The HF horizontal loop has been around for many years now. This article includes a YouTube video and discusses the reasons for looking at this antenna, its design, and its installation. There are some on-air comparisons against three regular double bazooka (coax) dipoles and the Par SWL End-Fed antenna.
[ Hits: 926 | Votes: 5 | Rating: 8 ]

Double BiQuad Antenna for 2.6 GHz - This is basic instructions for homemade 4G Antenna working on 2600 MHz UMTS featuring 13 14 dBi gain. This antenna is desigend to resonate on microwave frequencies in two segments from 2500 to 2570 MHz for Uplink, and from 2620 to 2690 MHz for Downlink.
[ Hits: 85 | Votes: 0 | Rating: 0 ]

Multi Band Slinky Doublet Antenna - An home made doblet antenna made with two Slinkys that are aproximately five meters in length connected with a twin-feed connected to a balanced ATU
[ Hits: 462 | Votes: 1 | Rating: 10 ]

The Infamous Attic Dipole - An attic wire antenna with several modifications during the time. Began as a simple coax fed doublet antenna, and upgraded to a multi-band hf fan dipole, till the G5RV all deployed in an attic.
[ Hits: 102 | Votes: 0 | Rating: 0 ]

Double Quad Antenna for VHF UHF - The structure of this dual band VHF UHF antenna is very simple. It consists of two identical square loops, whose sides measure a quarter wave, connected together at the ends. A project by I5NZR
[ Hits: 247 | Votes: 6 | Rating: 6.33 ]

A Double Windom Antenna for Eight or Nine Bands - A project for a multiband HF windom antenna by VE2CV and VE3KLO
[ Hits: 2372 | Votes: 11 | Rating: 8.09 ]

Doublet antenna as vertical T - A transmitting antenna 2x15m, about 100 foot doublet antenna fed by a ladder line of about 600 Ohm. Article in Polish and English,
[ Hits: 118 | 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 ]

Morse Code Practice Oscillator - In this project, we blend old school and new school tech to create a Morse code oscillator that you can use to practice keying Morse code. We start by milling out a double-sided board on the Bantam Tools Desktop PCB Milling Machine, then we solder on a series of components, and finally test our skills of yesteryear communication
[ Hits: 61 | 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 ]

Specan Spectrum analyzer - The Specan is actually a very simple but robustly built receiver. it is, in essence, a double conversion superhet receiver with 112 Mhz and 12 Mhz Intermediate frequencies. The first mixer uses an Si570 as the local oscillator. The Ardiuno that controls the Specan is a very flexible microcontroller board that you can program in simple C language
[ Hits: 86 | Votes: 1 | Rating: 9 ]