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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: 3008 | Votes: 0 | Rating: 0 ]
- 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: 9193 | Votes: 4 | Rating: 7.25 ]
- 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: 3636 | Votes: 1 | Rating: 10 ]
- Folding the Dipole
- The half wave dipole antenna is a simple and practical antenna model that consists of a half wavelength long centre fed conductor.
[ Hits: 2377 | Votes: 4 | Rating: 7.5 ]
- Axial-Mode Helical Antennas
- Turn Helical Antennas Over Perfect Ground and Modeling Helices in NEC-2
[ Hits: 1987 | Votes: 4 | Rating: 1.75 ]
- 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: 1651 | Votes: 0 | Rating: 0 ]
- 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: 3054 | Votes: 7 | Rating: 5 ]
- A Portable Antenna for Satellites
- A portable antenna for mode B and J satellites
[ Hits: 11398 | Votes: 6 | Rating: 3.67 ]
- Coax Traps from a Modeling Perspective
- About Coax Traps, NC4FB examine the operation of coax traps through modeling.
[ Hits: 677 | Votes: 1 | Rating: 5 ]
- 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: 8027 | Votes: 9 | Rating: 6.89 ]
- The Ham Band
- A music video describing the building of a modern contest station - it teaches you morse code at the same time! Musical styles change from French Musette to Viennese Walz to German Oompah and the musical key changes 25 times!
[ Hits: 435 | Votes: 0 | Rating: 0 ]
- Micro908 Kit
- A re-usable control & computing platform for
antenna measurement, PSK31 digital modems, audio filtering, signal source & VFO, memory keyer by AMQRP
[ Hits: 1570 | Votes: 1 | Rating: 10 ]
- 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: 1129 | Votes: 1 | Rating: 1 ]
- G4ILO Stealth Amateur Radio
- If you are a ham and live in a modern urban or suburban development, putting up a highly visible antenna may make it difficult to stay friends with your neighbours.
[ Hits: 1563 | Votes: 2 | Rating: 10 ]
- YAESU FL-2100Z Amplifier Repairs
- The FL-2100Z amplifier referenced in the following images is the 6-Band model covering 10m thru 160m (no WARC bands) and not the 9-Band version that included the WARC bands. Modifications, schematics and manual
[ Hits: 3479 | Votes: 8 | Rating: 7.25 ]
- Kenwood TS-2000 Review
- The Kenwood TS-2000 All-Mode Multiband Transceiver review
[ Hits: 1373 | Votes: 3 | Rating: 10 ]
- ZLP Electronics
- Yaesu Icom Kenwood CAT Interfaces. Isolated audio-DATA interfaces for ALL afsk DATA modes inc psk31 rtty sstv etc.
[ Hits: 1736 | Votes: 5 | Rating: 10 ]
- Yagi-logper
- Yagi-logper is a linux GPL program to model a Yagi or Log-periodic antennas with horizontal cylindrical dipoles.
[ Hits: 1686 | Votes: 3 | Rating: 7 ]
- Fldigi
- 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: 17900 | Votes: 24 | Rating: 7.49 ]
- FT-726 AUDIO Modifications
- Throughput improvement for the FT726R - Tapr PSK modem
[ Hits: 815 | Votes: 0 | Rating: 0 ]
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