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Antennas : Indoor- 20m Indoor Loop Antenna
- This antenna can gets you on the air on 14MHz, and it has a useable frequency range. The VSWR is almost perfect at the centre-frequency abd the design uses no expensive components.
[ Hits: 664 | Votes: 4 | Rating: 6.75 ]
- Log Periodic Dipole Array Calculator
- Description and online calculator for Log Periodic Dipole Arrays LPDA are directional antennas featuring a relatively constant characteristics across a wide frequency range.
[ Hits: 222 | Votes: 2 | Rating: 6 ]
- A Simple 2 Element Quad Antenna for 10 meters
- Quads beams consist of 2 1 wavelength (approximately) loops, ordinarily arranged so that one is the driven element and the other is the reflector. In this project author explains how to build a two element Quad Antenna for the 28 MHz.
[ Hits: 271 | Votes: 1 | Rating: 7 ]
- T2FD Antenna - Terminated and twisted folded dipole
- T2FD is a 600-900 ohms folded dipole, terminated with resistor. Feed impedance is coupled with 50/600 ohms voltage balun. It is a wide band antenna with rather low SWR over the full designed frequency range: antenna tuner is seldom needed.
[ Hits: 482 | Votes: 0 | Rating: 0 ]
- Which part of a dipole radiates most?
- The title may seem a strange question. Still, it is often said that the part where the current is largest, radiates most. And from that a rule of thumb follows, saying that if you don't have enough space to hang a complete half-wave wire dipole then try to make the central part hang as freely as possible.
[ Hits: 157 | Votes: 1 | Rating: 9 ]
- Z-Match 100 and mini Z-Match
- This is a antenna tuner with wide range tuning for antennas with a Z of + 50 Ohms on all the HF bands.
[ Hits: 297 | Votes: 0 | Rating: 0 ]
- The SPC Tuner
- SPC, series parallel capacitance, tuner project. Built properly, it will match a very wide range of impedance. It also maintains good harmonic attenuation.
[ Hits: 154 | Votes: 0 | Rating: 0 ]
- 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: 353 | Votes: 7 | Rating: 2.71 ]
- The DX Shop
- The DX Shop Limited are suppliers of high end equipment and manufacturers of the Linear Amp Gemini range of HF to UHF solid state linear amplifiers for the serious Radio Amateur.
[ Hits: 148 | Votes: 0 | Rating: 0 ]
- Aircraft Scatter
- Aircraft can also be used to increase communications range, by using Aircraft Scatter
[ Hits: 134 | Votes: 1 | Rating: 9 ]
- HF communication prediction tools
- Online HF Communication prediction system provided by the Australian Governament Buerau of Metereology allow to predict usable frequency rage for radiocommunications between two stations allowing to specify frequency and date range. This tool allow calculation with different methods and algorithms
[ Hits: 168 | Votes: 0 | Rating: 0 ]
- Tropospheric Ducting Forecast Europe
- The areas noted in the forecast have the necessary atmospheric conditions to produce tropospheric bending of VHF, UHF and/or microwave radio waves. Tropospheric bending extends the range of radio & TV stations well beyond their normal limit and thus increases interference amongst stations as well.
[ Hits: 152 | Votes: 1 | Rating: 10 ]
- LAN-IQ SDR
- Stand Alone Software Defined Radio, direct sampling receiver from 30 kHz to 1700.00MHz continuous frequency range, LAN interface for remote access
[ Hits: 258 | Votes: 1 | Rating: 8 ]
- Ham Goodies
- Amateur Radio goodies for not only the Shack, but also a range of outdoor/portable kit. Ferrite toroids, RTL SDR, Un-uns and Baluns for antennas and RF Filters. Based in the UK.
[ Hits: 144 | Votes: 0 | Rating: 0 ]
- Strictly Ham
- Strictly Ham has a large retail presence in Australia and welcomes inquiries from New Zealand, the Pacific and Asia. Strictly Ham offers a comprehensive range of high quality Amateur, CB and Marine products, based in Victoria Australia
[ Hits: 185 | Votes: 10 | Rating: 4.1 ]
- SDRangel
- SDRangel is an Open Source Qt5 / OpenGL 3.0+ SDR and signal analyzer frontend to various hardware TX & RX Software Defined Radio. SDRangel uses sample source plugins to collect I/Q samples from a hardware device.
[ Hits: 155 | Votes: 1 | Rating: 6 ]
- Universal HF Tracker
- The PCB can produce a High Frequency RF signal in the range of 1MHz to 12.5MHz using an AD9833 Direct Digital Sequence (DDS) frequency synthesizer. The signal can be modulated with different Weak Signal modes such as WSPR, JT9 and JT65 using our Arduino 5V/16MHz Pro Micro software.
[ Hits: 141 | Votes: 0 | Rating: 0 ]
- ICOM IC-775 FIlter Installation
- Inrad Roofing Filter installation instruction, The IC-775 Roofing Filter Mod consists of a 6 pole, 5 kHz wide filter followed by a high dynamic range, feedback amplifier.
[ Hits: 60 | Votes: 0 | Rating: 0 ]
- Simple 2.4 GHz SWR Meter
- This is a simple 2.4 GHz SWR meter which is based around surplus microwave hardware which can be easily found. The main component is a MECA -20/-20 dB Directional Coupler which has a frequency range of approximately 700 MHz to 2.5 GHz.
[ Hits: 141 | Votes: 2 | Rating: 6 ]
- SDR Receiver with RTL-SDR and Gnu Radio
- This project is a Software Defined Radio Receiver. It has a frequency range of 24MHz 1.2GHz. It can demodulate AM, FM, USB, LSB with selectable bandwidths of 600, 2400, 2800, 3200 and 6400Hz. Using a simple RTL-SDR Dongle and Raspberry Pi 3 computer using GNU RADIO
[ Hits: 479 | Votes: 1 | Rating: 1 ]
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