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361 links - and 3 categories

Antennas : 20M
  • W5GI Mystery Antenna  pop - W5GI Mystery Antenna is a multi-band wire antenna that performs exceptionally well even though it confounds antenna modeling software. This antenna covers 80 to 6 meters with low feed point impedance and will work with most radios, with or without an antenna tuner. It is approximately 100 feet long, can handle the legal limit, and is easy and inexpensive to build. It is similar to a G5RV but a much better performer especially on 20 meters.
    [ Hits: 139316 | Votes: 123 | Rating: 7.55 ]
Antennas : 20M : 20 meter Yagi antennas
  • 2-Element-Yagis for HF  pop - 2-Element parasitic Yagis for the Shortwave-Bands 10-12-15-17-20-30m. The antennas are feeded with the DK7ZB-match. A quarter-wave choke of coax is grounded at the socket.
    [ Hits: 50021 | Votes: 146 | Rating: 7.08 ]
Antennas : 2M
  • The 2-Element-HB9CV-Beam  updated - The HB9CV-Beam is a 2-Element-Yagi with two driven elements and was introduced by Rudolf Baumgartner, HB9CV in the 1950ies. This beam antenna is a coax-feeded version of the ZL-Special construction by DK7ZB for 2m, 6m and 10m
    [ Hits: 19702 | Votes: 407 | Rating: 7.56 ]
Antennas : Array Antennas : Feed Lines Antennas : Feed Lines : Choke
  • Choke balun - Essentially, a choke balun is designed to 'divorce' your antenna from the feed line. if your feed line is coaxial cable then you don't want it to be part of your antenna. you want to be able to deliver all your power to the radiator itself, i.e. 'the antenna'. a choke balun does this admirably
    [ Hits: 573 | Votes: 11 | Rating: 7.27 ]
Antennas : Multiband
  • HF multiband vertical Antenna - YF1AR multiband vertical antenna, based on orginal concept by VE7BS. Consist of 6 vertical elements and 6 base radials with a single 50 Ohm feed line.
    [ Hits: 1539 | Votes: 4 | Rating: 3.25 ]
  • LU9DPD Windom dipole - A multiband windom dipole antenna for 80 40 20 10 meters, feeded with a home made 4:1 balun, in spanish.
    [ Hits: 5341 | Votes: 5 | Rating: 6 ]
Antennas : Satellite
  • K5OE, 70 cm Quagi Antenna - An AO-10 antenna by K5OE, this design is optimized for 436.8 mHz with a 50 Ohm feed
    [ Hits: 5343 | Votes: 5 | Rating: 7.4 ]
Antennas : VHF UHF
  • DK7ZB 144 mhz Yagis - High gain, good pattern and acceptable bandwidth. These aims can be realized with a radiation-resistance of 25-35Ohms, because the 28-Ohm-feedpoint is very simple to match.
    [ Hits: 1908 | Votes: 7 | Rating: 6.86 ]
  • Copper Cactus Single Coax Feed - Single Coax Feed to Multi-Band Copper Cactus Antenna.
    [ Hits: 1324 | Votes: 1 | Rating: 10 ]
Antennas : WiFi
  • A Tincan feed for 2.45Ghz - Construction details for a simple but effective antenna for 2.45Ghz wireless lan use.
    [ Hits: 6861 | Votes: 9 | Rating: 5.56 ]
  • 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 ]
  • WK8L's ATV Page - Includes links and documentation on wifi antennas, 2.4 GHz Coffee Can Feed Antennas
    [ Hits: 3544 | Votes: 4 | Rating: 5 ]
Internet and Radio : Police Scanners
  • Orlando Florida live scanner  pop - Public safety scanner feed from Orlando Fl
    [ Hits: 28296 | Votes: 216 | Rating: 6.34 ]
  • Louisville Metro Police - Louisville Metro Police Department live scanner feeds, includes 8 live feeds and commonly used 10 codes.
    [ Hits: 13577 | Votes: 130 | Rating: 6.57 ]
  • Dallas police live scanner  pop - Listen to the Dallas Ambulance, Fire & Police live scanner radio feed
    [ Hits: 29246 | Votes: 187 | Rating: 6.32 ]
  • Las Vegas Metro Police Department 24/7 Scanner  updated  pop - Las Vegas, NV Police scanner. It is 24/7 and live. LVMPD has changedradio systems to a fully encrypted system. Live streaming is offline
    [ Hits: 84241 | Votes: 491 | Rating: 9.36 ]
Operating Modes : APRS
  • Citizen Weather Observer Program - A private-public partnership with three main goals to collect weather data contributed by citizens; to make these data available for weather services and homeland security; and to provide feedback to the data contributors so that they have the tools to check and improve their data quality
    [ Hits: 448 | Votes: 2 | Rating: 7.5 ]
Technical Reference : Amplifiers : RF Amplifiers Theory
  • Negative feedback output circuit - Negative feedback is often referred to as shunt feedback in conjunction with emitter degeneration.
    [ Hits: 1105 | Votes: 1 | Rating: 10 ]

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