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Antennas : Antenna Calculators
- Axial-Mode Helical Antenna Calculator
- Simple implementation of the ARRL Antenna Book design equations for the axial-mode helical antenna.
[ Hits: 2534 | Votes: 15 | Rating: 5.40 ]
- 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: 3433 | Votes: 1 | Rating: 10.00 ]
- A Portable Antenna for Satellites
- A portable antenna for mode B and J satellites
[ Hits: 10546 | Votes: 5 | Rating: 4.20 ]
- Antenna Theory
- Introduction to Electromagnetics, Maxwell's Equations, Transmission Line, Models, scale modeling, constants
[ Hits: 972 | Votes: 3 | Rating: 7.33 ]
- Coax Traps from a Modeling Perspective
- About Coax Traps, NC4FB examine the operation of coax traps through modeling.
[ Hits: 453 | 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: 7425 | Votes: 5 | Rating: 6.80 ]
- Antique Radio Repair and Restoration
- Classic Radio Restorations specialize in professional repair and restoration on all makes and models of antique radios and vintage phonographs. Since 1978.
[ Hits: 948 | Votes: 0 | Rating: 0.00 ]
- 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: 292 | Votes: 0 | Rating: 0.00 ]
- 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: 12068 | Votes: 101 | Rating: 4.70 ]
- DX marathon Award
- Simply work as many countries and CQ Zones as you can in each calendar year, regardless of the band or mode
[ Hits: 400 | Votes: 0 | Rating: 0.00 ]
- Frequencies for using digital modes
- These frequencies are to be used as a guide to find the related signals. They have come from several sources, and are, in no way, guaranteed to be complete, accurate, or inclusive.
[ Hits: 1048 | Votes: 1 | Rating: 1.00 ]
- Sights and Sounds of Digital Signals
- Preview the waterfall signature of various digital signals and listen to the sound of the digital modes. Learn about the bandwidth requirements and why a linear transmitter path is critical to successful and correct use of many modes on the amateur bands by W1HKJ
[ Hits: 713 | Votes: 2 | Rating: 9.50 ]
- 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 ]
- 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: 1171 | Votes: 2 | Rating: 10.00 ]
- 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: 3076 | Votes: 8 | Rating: 7.25 ]
- Kenwood TS-2000 Review
- The Kenwood TS-2000 All-Mode Multiband Transceiver review
[ Hits: 1143 | Votes: 0 | Rating: 0.00 ]
- ZLP Electronics
- Yaesu Icom Kenwood CAT Interfaces. Isolated audio-DATA interfaces for ALL afsk DATA modes inc psk31 rtty sstv etc.
[ Hits: 1515 | Votes: 5 | Rating: 10.00 ]
- JQAM (QAM modem)
- Transmit audio/video, UDP packets, http, rs232, with QAM using the soundcard rates up to 100kb/s.
[ Hits: 1623 | Votes: 7 | Rating: 4.71 ]
- How to make an APRS IGATE
- How to make an APRS IGATE using Linux, soundmodem and aprx by HA2NON
[ Hits: 883 | Votes: 1 | Rating: 1.00 ]
- FT-726 AUDIO Modifications
- Throughput improvement for the FT726R - Tapr PSK modem
[ Hits: 595 | Votes: 0 | Rating: 0.00 ]
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