double z
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Antennas : Antenna Calculators- Extended Double Zepp NVIS Antenna Calculator
- Extended Double Zepp measurements for all ham bands, and online calculator. The antenna is constructed much like an ordinary Dipole antenna but with 5/8 Wavelength Elements matched with an added Impedance Matching Section of balanced feed line
[ Hits: 124 | Votes: 3 | Rating: 7 ]
- 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 ]
- Open-Folded W8JK Antenna for HF
- Originally designed by John Kraus, W8JK in about 1940, this antenna has some interesting properties.
The W8JK antenna is 2 (Two) centre-fed double-dipole fed by a pair of anti-phase signals. Small size, simple antenna, offer nice performance but need a tuner. Tested in this project from 30m to 6m bands
[ Hits: 141 | Votes: 1 | Rating: 3 ]
- 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 ]
- FunCube Dongle HF Upconverter: Expanding Reception Range
- This article describes an HF upconverter for the FunCube Dongle Pro. Designed for radio amateurs, the converter extends reception capabilities to lower frequencies (0 Hz to 30 MHz) by mixing them with a higher oscillator frequency (100 MHz). This translates the desired signal into a range detectable by the FunCube Dongle (64 to 1,700 MHz). Key components include a double-balanced mixer and a low-pass filter to suppress unwanted signals. The project provides schematics, filter specifications, and design considerations for construction.
[ Hits: 34 | Votes: 1 | Rating: 8 ]
- 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 ]
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