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Antennas : 40M
- NVI 40 Meter Antenna Modeling
- The idea of using a low mount dipole, enhanced with reflector wires directly beneath the dipole, on the ground, appears to be a very good approach to creating an NVI specific antenna for local HF operation.
[ Hits: 2807 | Votes: 0 | Rating: 0.00 ]
- A Cost Effective Current-mode 1:1 Balun
- A cost effective current-mode 1:1 balun can be constructed from a length of coax and a rod typically used for a broadcast antenna loop-stick, some electrical tape, cable ties, a length of PVC water-pipe and some connectors.
[ Hits: 8014 | Votes: 1 | Rating: 10.00 ]
- The Guanella 1:4 balun
- A cost effective current-mode 1:4 balun can be constructed from two lengths of coax, two ferrite rods, some electrical tape, cable ties, a length of PVC water-pipe and some connectors. This form of 1:4 current-mode balun is named after G. Guanella.
[ Hits: 3422 | Votes: 1 | Rating: 10.00 ]
- Axial-Mode Helical Antennas
- Turn Helical Antennas Over Perfect Ground and Modeling Helices in NEC-2
[ Hits: 1823 | Votes: 4 | Rating: 1.75 ]
- Coaxial-feed axiam mode helical antenna
- Coaxial-feed axial mode hemispherical antenna is studied experimentally and theoretically
[ Hits: 1231 | Votes: 0 | Rating: 0.00 ]
- Axial-Mode Helical Antennas
- Notes on Axial-Mode Helical Antennas in Amateur Service. Helix Basics, Modeling Issues, and Short Helical Antennas Over Perfect Ground
[ Hits: 1512 | Votes: 0 | Rating: 0.00 ]
- The normal-mode helix antenna
- A helix will work in the normal mode when the diameter and pitch of the helix is less than 0.1 Lambda
[ Hits: 2855 | Votes: 6 | Rating: 5.67 ]
- A Portable Antenna for Satellites
- A portable antenna for mode B and J satellites
[ Hits: 10523 | Votes: 5 | Rating: 4.20 ]
- Coax Traps from a Modeling Perspective
- About Coax Traps, NC4FB examine the operation of coax traps through modeling.
[ Hits: 446 | Votes: 0 | Rating: 0.00 ]
- Windom Antenna with 4:1 balun
- The Windom is an Off-center wire multiband Antenna. The old version was fed just by a single-wire connected on 1/3 of antenna's overall length or with an open-line feeder (later versions). Here is another model with coaxial feeder, which is compatible with Solid States - 50 Ohm output transceivers .
[ Hits: 7408 | Votes: 5 | Rating: 6.80 ]
- Lincoln Amateur Radio Club
- Everything you need to know about how to being a ham. Classes, testing, operating various modes and equipment
[ Hits: 509 | Votes: 5 | Rating: 9.80 ]
- Digital QSO Club
- The Digital QSO Amateur Radio Club DQSO is an informal club of amateur radio operators active use digital modes on all bands. Membership is free for any licensed radio amateurs.
[ Hits: 1559 | Votes: 4 | Rating: 1.00 ]
- HB9FX Internet Remote Base JN37XH Hochwacht Zofingen Switzerland
- Tune and / or listen between 10kHz - 10GHz to professional Online-Receivers as Rhode & Schwarz EK070 or AEG E1900/3, Amateur-Radio-Transceivers, Web-SDR, Digital-Modes, Repeaters, EchoLink, APRS or control Antenna-Switch-Matrix, Antenna-Tuner, SWR & PWR- Control or Web-Cams.
[ Hits: 12029 | Votes: 101 | Rating: 4.70 ]
- Micro908 Kit
- A re-usable control & computing platform for
antenna measurement, PSK31 digital modems, audio filtering, signal source & VFO, memory keyer by AMQRP
[ Hits: 1401 | Votes: 1 | Rating: 10.00 ]
- Have you ever wondered where different modes should be operated, what frequencies to avoid as a courtesy like SSTV etc? This site offer a database for known net frequencies,known segments for different modes, known beacons
[ Hits: 11243 | Votes: 10 | Rating: 7.49 ]
- Choking on RF
- The intrepid newcomer encounters common mode problems in a mobile environment. Implementing some common mode chokes will be possible to reduce interferences
[ Hits: 975 | Votes: 0 | Rating: 0.00 ]
- Manufacturer's representative of wireless communication radio equipment, 2-way radio sales, land mobile radio sales, repeaters, duplexers, antennas, pl tone, hf, vhf and uhf data modems and LAN ethernet radio modems for commercial and amateur radio users.
[ Hits: 354 | Votes: 0 | Rating: 0.00 ]
- Yagi-logper is a linux GPL program to model a Yagi or Log-periodic antennas with horizontal cylindrical dipoles.
[ Hits: 1397 | Votes: 3 | Rating: 7.00 ]
- Fldigi Freeware Digital multi mode program for Linux, Free-BSD, MacOS X and MS Windows . Support CW and several digital modes like PSK31, MFSK, RTTY, Olivia, WeFax, Hell and others and is a fully multi platform application
[ Hits: 12155 | Votes: 13 | Rating: 8.24 ]
- Lightning Safety & Power Quality Issues
- LightningProtection: Lightning Safety & Power Quality Issues. A moderated professional forum by recognized experts, for accurate technical information on lightning, surge and grounding information.
[ Hits: 708 | Votes: 2 | Rating: 10.00 ]
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