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32 links

Antennas : Helical
  • Helical Antennas - The Helical antenna description, a simple way of obtaining high-gain and a broad band of frequency characteristics
    [ Hits: 1341 | Votes: 1 | Rating: 10 ]
Antennas : Traps
  • Tuning HF Coaxial Antenna Traps - The problem with making your own trapped HF antennas is usually getting the coaxial traps tuned to frequency.
    [ Hits: 1960 | Votes: 2 | Rating: 4 ]
Antennas : WiFi
  • Dish 802.11 Wireless Networking Antenna - This antenna modification is for the IEEE 802.11b networking protocol that operates at 2.4 GHz. It can be scaled easily to the 5 GHz frequency used by IEEE 802.11a by simply scaling the dimensions on the feed can and the excitation antenna to 2.4/5 = 48% of the dimensions shown above.
    [ Hits: 9443 | Votes: 8 | Rating: 6 ]
Ham Radio : Resources Internet and Radio : Live streaming
  • WD8KAF Live Repeater Stream - This repeater is broadcast from Coldwater, MI on a frequency of 147.300 MHz. Owned and maintained by the Branch County Amateur Radio Clu
    [ Hits: 2328 | Votes: 4 | Rating: 4.25 ]
Internet and Radio : Video
  • How To Make A VO-52 SAT QSO Video - Using a home made 10 element 435 & IO Loop for 145MHz, with a Yaesu FT-847. Simon - 2E0HTS, adjusts his (uplink) transmitted signal to correct the doppler of the Received (downlink) frequency.
    [ Hits: 1025 | Votes: 0 | Rating: 0 ]
Manufacturers : Test Equipment : Signal generator
  • Keysight (Agilent) Signal Generator - Keysight offers numerous baseband, RF, and microwave signal generator (signal source) products. From basic to advanced, baseband to 67 GHz, Keysight signal generators are capable of frequency extensions to 500 GHz with millimeter-wave source modules.
    [ Hits: 237 | Votes: 0 | Rating: 0 ]
Operating Aids : Radio Spectrum
  • Hellschreiber frequencies - Suggested frequencies for HELLSCHREIBER operation by the feldhell club
    [ Hits: 2016 | Votes: 6 | Rating: 7 ]
Operating Modes : GPS
  • USCG Navigation Center DGPS - Differential Global Positioning Service (DGPS) is a land-based augmentation system that receives and processes signals from orbiting GPS satellites, calculates corrections from known positions and broadcasts these corrections via a Medium Frequency (MF) Transmitter to DGPS users in the Broadcast Site's coverage area.
    [ Hits: 2006 | Votes: 2 | Rating: 4.5 ]
Radio Equipment : VHF-UHF Handhelds : Yaesu VX-5R
  • Modifications for the Yaesu VX-5R - VX-5R Loose antenna cure, Vx-5r Free Band, VX 5 R modification for German, VX-5R expanded frequency mod, VX-5R MARS/CAP & freeband mod
    [ Hits: 3434 | Votes: 2 | Rating: 4 ]
Radio Scanning : Maritime
  • U.S. VHF Channells - US coast guard frequency list
    [ Hits: 882 | Votes: 3 | Rating: 7 ]
  • Marine VHF Frequencies - The following table is adapted from the International Telecommunications Union Radio Regulations Appendix 18, including changes adopted by the 2012 World Radio Conference.
    [ Hits: 819 | Votes: 1 | Rating: 6 ]
Radio Scanning : Police Scanning Radio Scanning : Regional : Europe Technical Reference : Beacon keyers
  • 70MHz Beacon - Description of the beacon hardware and DDS frequency source used for G4JNT personal beacon
    [ Hits: 364 | Votes: 1 | Rating: 10 ]
Technical Reference : Coax Cables and Connectors
  • Coaxial Cable & Power Handling - This calculator can be used to estimate the attenuation (dB loss), power handling capability, and transmission efficiency for some of the more popular Wireless Communications and MIL Spec cables at the frequency of interest
    [ Hits: 1181 | Votes: 8 | Rating: 8.17 ]
Technical Reference : DTMF
  • DTMF in amateur radio - About usage of DTMF Dual Tone Multi Frequency in ham radio applications
    [ Hits: 270 | Votes: 0 | Rating: 0 ]
Technical Reference : Filters
  • Homebrew a CW Filter - An home-brewed morse code CW filter with a central frequency of 800hz and a variable bandwidth from 230hz to 26hz by F5RDH in french.
    [ Hits: 1767 | Votes: 2 | Rating: 2.5 ]
  • About Cavity Filters - Cavity filters are tipically circuitry behind a duplexer that allow only certain frequencies to pass
    [ Hits: 470 | Votes: 3 | Rating: 5.33 ]
Technical Reference : Transverters
  • Microwave Transverters Projects - A collection of some electronics hobby projects by KC6QHP that includes microwave transverters for several radio frequencies such as 79 GHz, 47 GHz 24 GHz and 10 GHz. All projects includes detailed pictures of components, like voltage regulator boards, RF Decks, sequencer and protector board and receiver details.
    [ Hits: 158 | Votes: 0 | Rating: 0 ]

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