84 links - and 2 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: 133351 | Votes: 115 | Rating: 7.76 ]
Antennas : Baluns
  • High impedance baluns - Introduction with some background on balun types
    [ Hits: 851 | Votes: 0 | Rating: 0 ]
Antennas : End-Fed
  • Feeding an End-Fed Antenna - End-Fed antennas are NOT balanced systems; but neither are verticals, ground planes, discones, windoms, zepps, Marconis, half-slopers, et al. Additionally, the low-impedance antenna port of your transmitter/receiver is not balanced.
    [ Hits: 20838 | Votes: 20 | Rating: 7.76 ]
Antennas : Feed Lines
  • SWR: Maximum allowable VSWR - VSWR (voltage-standing-wave-ratio) represents the degree with which an antenna is "matched" to the system impedance. Most modern antennas do not require any tuning for optimum performance. VSWR is one of the easiest parameters to measure and VSWR meters are becoming very popular antenna installation tools
    [ Hits: 1182 | Votes: 3 | Rating: 3.33 ]
  • Transmission Lines - About feed lines, parallel lines and coaxial lines, notes on impedance, SWR, Baluns, velocity factor and more by NZART
    [ Hits: 562 | Votes: 1 | Rating: 8 ]
  • Where Does the Power Go - An Energy Analysis at an Impedance Discontinuity in an RF Transmission Line
    [ Hits: 650 | Votes: 3 | Rating: 10 ]
Antennas : Homebrewing Techniques
  • Antenna Impedance measurement - When experimenting on an antenna it's often important to determine its feedpoint impedance at various frequencies across the operating band. It's easy enough to measure SWR, but sometimes we need to know more detail than this
    [ Hits: 1342 | Votes: 6 | Rating: 2.67 ]
Antennas : Traps
  • Multi Band Antenna Traps - These devices are called Traps, but they are actually more like frequency sensitive switches. They are parallel resonant, high Q, tuned circuits which provide a very high impedance at their frequency of resonance.
    [ Hits: 4782 | Votes: 3 | Rating: 6 ]
Operating Modes : Mobile
  • K0BG's ham radio mobile operator web site - This site is dedicated to mobile amateur radio operators, old and new alike. Whether you are into HF, or VHF operation, I trust the information presented will increase your enjoyment of our great hobby. With safety as a byword, there are articles on amplifiers, antennas, bonding, impedance matching, installing hardware, mobile equipment, noise and RFI abatement, wiring, and much more. I do my best to keep these articles up to date, and easy to follow.
    [ Hits: 4697 | Votes: 10 | Rating: 8.7 ]
Software : Antenna analysis
  • Smith chart - Match & display imped of antennas, can graphically visualize and compare two sets of measured impedances simultaneously.
    [ Hits: 3491 | Votes: 9 | Rating: 4.12 ]
  • AEA - Wireless software - AEA Wireless Director Software Series turns PC's (running Windows 95/98/2000/ME or NT) into powerful tools that expand the use and power of SWR, Return Loss and Complex Impedance Analyzers.
    [ Hits: 2636 | Votes: 6 | Rating: 5 ]
  • TLDetails - Transmission Line Details. This utility program shows the impedance and SWR at both ends of a transmission line and the details of power loss in the line. It includes characteristics for over 40 built-in line types. You can modify these values to see how small changes affect the results or to specify custom lines. All program inputs may be changed directly or you can use spin buttons to make the changes. If you are using a moderately fast computer you can hold down a spinner and "watch the movie" on the charts as the results are recomputed. By AC6LA
    [ Hits: 1047 | Votes: 4 | Rating: 9.25 ]
Software : Circuit Design Software : Collections
  • W9DMK Software - Various radio related software, including some antenna analysis, and impedance calculators.
    [ Hits: 2774 | Votes: 5 | Rating: 6 ]
Software : Linux
  • Smith chart calculator - linSmith is a Smith Charting program, mainly designed for educational use. It allows defining multiple load impedances (different frequencies), and adding components (discrete components and line sections) in series and parallel. It plots the impedances on the screen, shows the values in table format, and is able to generate publication quality Postscript output.
    [ Hits: 4010 | Votes: 28 | Rating: 3.92 ]
Software : Oscilloscope
  • Cobracom - Oscilloscope, Realtime spectrum analyzer, Impedance meter, RLC bridge and signal generator for Windows. Is a Windows application that converts your PC into a powerful dual-trace signal analyzer (oscilloscope, FFT etc...) . Uses your PC sound card as an Analog-to-Digital a Converter to digitize any input waveform and as Digital-to-analog Converter for the signal generator. True 24 bit adc/dac 48K/96k/192k sampes/sec.
    [ Hits: 20903 | Votes: 13 | Rating: 6.23 ]
Software : Utilities
  • RevLoad - This graphics-intensive program reveals the load on the output of a matching-network, based on measurements of the components in that network. Adjust the network (tuner) for a flat input, measure or look up the network component values and you will immmediately see the R and jX values of the load on the network, presented as both a schematic with the component values and as a Smith Chart normalized to the specified system impedance.
    [ Hits: 640 | Votes: 1 | Rating: 10 ]
Technical Reference : Audio
  • Bass EQ Pre Amp - A Bass Eq Pre amplifier for high impedance PU by ON6MU
    [ Hits: 392 | Votes: 0 | Rating: 0 ]
Technical Reference : Duplexers
  • AA5TB Antenna Coupler / SWR Bridge - Wire antennas requires a special coupling network to properly couple my 50 ohm coax to the antenna's high impedance (5000 ohms)
    [ Hits: 4626 | Votes: 2 | Rating: 9.5 ]
Technical Reference : Homebrew
  • Impedance Bridge - by Harry Lythall SM0VPO
    [ Hits: 4281 | Votes: 11 | Rating: 7.38 ]

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