JavaScript®
Electronic
Notebooks
Introduction

This is a map of the part of my web site that has to do with my Javascript Electronic Notebook. Each page, under each catagory is a clickable links. Next to each page name is a brief description. All of these web pages contain Javascript calculators of one kind or another. In some cases it's as simple as adding a couple of resistor values together, but in others, rather complicated equations are processed.

  • Resistors
  • Capacitors
    • Basic Capacitors
      • Calculators for capacitors in series and parallel.
    • Plate Capacitors
      • Calculators for determining the capacitance of 2 or more metal plates separated by an insulating material.
    • Cylindrical/Coaxial Capacitors
      • Calculator for creating cylindrical capacitors and. information on the capacitance of coaxial cable.
    • Reactance, L/C
      • An introduction to Inductive/Capacitive Reactance. Contains a L/C/X Slide calculator and L/C/X Chart.
  • Power Supplies
    • Unregulate Power Supply
      • A transformer, some diodes and a couple of capacitors are all you need to make a simple Un-Regulated power supply. This supply can then be filtered using the LM317 Voltage Regulator.
    • Zener Regulation
    • LM317 Voltage Regulator
      • This regulator is intended to follow the Un-Regulated power supply. This regulator provides the necessary ripple and load regulation required by more sensitive transistor circuits.
    • System Voltage Drop
      • Calculator to help estimate cable voltage drop in a power transmission system.
  • Filters
    • LC Low/High Pass Filters
      • Contains two LC filter calculators. One for a Butterworth response and one for a Chebyshev response. Each calculator provides the ability to enter Cutoff Frequency and Characteristic Impedance. The you can select Low Pass or High Pass, L-Input or C-Input, and the number of components (1 to 9).
    • 2/3-Way Speaker Cross-Over
      • Contains two calculator for 2-Way and 3-Way speaker cross-over networks. After you enter the speaker impedances and cross over frequency, you can select from a variety of speaker responses. At the bottom of the page is a brief explanation of each type of response.
    • 2nd Order Active Filters Low/High-Pass
      • Contains two calculators for 2nd Order Low-Pass and High-Pass Active (Op-Amp) Filters. While both calculators perform the same function, one calculator uses a series of equations and the other uses design tables and scale factors. Power recomendations are provided at the bottom of the page.
  • Filters
    • 2nd Order Active Filters Band-Pass
      • Contains two calculator for 2nd Order Band-Pass filters and one for 2nd Order Bi-Quad Band-Pass Filters. The 2nd Order Band-Pass Filter calculators allow for the selection of Gain, Configuration (MFB/VCVS), Center Frequency, Bandwidth, and initial component specification. One uses equations to calculate the component values and the other uses design tables and scale factors. The 2nd Order Bi-Quad Filter provides Low-Pass, High-Pass, and Band-Pass operation in a single filter. The calculator lets you specify the center frequency, bandwidth, filter Q, and initial components.
    • 2nd Order Active Filters Band-Reject
      • Contains a calculator for a 2nd Order Active Band-Reject Filter. This type of filter is also known as a notch filter and is useful for eliminating unwanted QRM and QRN. The calculator allows for the selection of Gain, Configuration (MFB/VCVS), Center Frequency, Bandwidth, and initial component specification.
    • 3rd Order Active Filter LP
      • In work. Currently incomplete.
  • Antennas - HF Wire
    • End Fed Antenna
      • A look into the construction and use of a Single Wire/End Fed Antenna. It contains recommended lengths, tuner usage, and general observations.
    • Half Wave Dipole
      • The Center-Fed Dipole is probably the simplest of the single band wire antennas. Easy to construct and setup. A wire length calculator is included that should minimize any pruning.
    • Shorty 40 and Shorty Other
      • The first section describes the Shorty 40, 40 Meter dipole, originally described by Jact Sobel, W5VM, that fits into the space of a 20 Meter dipole. The second section is a calculator for designing a similar short antenna (base loaded) for any other band.
    • ES2B Dipole
      • The Electrically Short 2-Band Center-Fed Dipole is a method for expanding a single band dipole to another lower frequency band, that still fits in your available space. Contains a calculator to aid in your design.
    • Short Dipole
      • If you don't have the space for a full size dipole, you might want to consider a Electrically Shortened Center-Fed Dipole. The calculator on this page helps you design a single band dipole that uses a loading coil to shorten the overall length. It may not be as efficient as a full size dipole, but it should still work fine and give you plenty of contacts.
  • Antennas - HF Wire
    • Short Multi-Band Dipole
      • This provides an possible solution if you want a dipole for multiple bands, but don't have the room for a full size dipole on all the bands you want. The calculator on this page helps you work out the details.
    • Fat (Broadbanded) Dipole
      • You have the space for a full size dipole on 160 or 80 Meters, but wish it had a little more bandwidth. This page provides the details to expand the dipoles capabilities.
    • Coax Trap Antenna
      • This page discusses the expansion of a low frequency single band dipole, for use on other higher frequency bands using traps using coaxial cable. In many cases the coaxial cable traps help shorten the require space. This page also provides an alternate configuration that might help increase the efficiency and bandwidth by using a Fan layout.
    • Folded Dipole
      • Similar in appearance to the Half-Wave dipole, this configuration can give you wider band coverage and higher feed impedances. You can feed it directly with open wire line or 50 Ω coax with a 4:1 balun at the feed point.
    • Inverted-V
      • When you don't have the room for a full size dipole or need to minimize supports, this may be the antenna for you. This page takes care of the geometry involved in setting up your antenna.
  • Antennas - HF Other
    • Yagi Antenna (2-6 Element)
      • This page contains several relatively simple calculators that allow you to work out the design of 2, 3, 4, or 6 element Yagi antennas, for the HF band (20 to 6 Meters). The bottom of the page describes matching the driven element using a Gamma Match.
    • 2-Element HF Yagi Design
      • Adding a single driven element to a simple dipole antenna provides you with 4-5 dB of forward gain and 12 db of F/B Ratio. And, it can be easily tuned on the ground. The dimensions might be a little much on 40 Meters, but not so bad on 20 Meters and above. Thanks to Bill Orr, W6SAI, for much of this information.
    • 3-Element HF Yagi Design
      • Similar to the page on 2-Element HF Yagis, this page adds a Reflector element for even more forward gain (7.5 to 8.5 dB) and a better F/B Ratio (20-25 dB). Again, thanks to Bill Orr, W6SAI, for much of this information.
    • 2 & 3-Element HF Yagi Matching
      • The matching system that you use depends on many things. This page describes several types of matching and where they might be applicable. Delta and T-Match for Balanced feeds and T-Match, Gamma/Omega, and Hair Pin (aka Inducto or Beta) matching for coaxial cable feeds. There are a couple of drawing that still need some work.
  • Antennas - VHF
    • Aircraft Band Antenna
      • This sound like this page simply describes a antenna for the 108 to 137 MHz Aircraft band (aka Air Band). But what it really does is describe the effects of dipole element diameter on the SWR and Gain. There is a nice graph that show you the SWR and Gain for a variety of element diameters.
    • J-Pole (144 MHz, 220 MHz, 440 MHz, ...)
      • Provides a calculator that give you the design dimensions for the classic J-Pole design using 1/2" copper tubing.
    • VHF/UHF Antennas (Basic)
      • This page really discusses the coaxial cables used to feed VHF/UHF Antennas. Coaxial cables may not have big losses in the HF region, their losses go up with frequency. This page shows, graphically, why one coax might be better to use than another. Contains a calculator for determining actual loss due to cable type, length, and system SWR.
    • VHF/UHF Yagi Antenna (2-6 El.)
      • Currently this page links to the HF page on Yagi antennas. It will be replaced in the near future.
    • VHF/UHF Yagi (11.8 to 21.6 dBd)
      • High Gain (11.8 to 21.6 dBd)/Long Boom Yagi (2.2 to 39 wavelengths) antennas.
    • VHF/UHF Yagi (Quick)
      • The same design program as the VHF/UHF Yagi Antenna Design, but without all the rhetoric. One page has everything.
    • VHF/UHF Yagi Feed
      • A description of the Folded Dipole feed intended for the Yagi Design program above.
    • VHF/UHF Yagi Help
  • General Information
    • Antenna Element Lengths
      • Contains a calculator as an aid for determining antenna element lengths, based on Frequency, Type (Wire or Tubing), and Diameter (AWG#, inches, mm) of the element. Also contains a "Table of Horizontal Antenna Lengths from 1 to 7 Half-Wavelengths", a "Table of Vertical Antenna Lengths from 1 to 7 Quarter-Wavelengths", and "Calculation of K, the Antenna Shortening Factor". All of which is based on a user's frequency input.
    • Antenna Freq./Dia./Length Scaling
      • Contains a calculator for scaling an existing antenna design for another band/frequency. Plus a calculator for adjusting a existing antenna element that is cut for one frequency to another frequency, in diameter as well as length.
    • US Amateur Radio Privilages
      • Contains details for each band (160 to 6 Meters) where radio amateurs have operating privilages. Each band is detailed separately and contains a brief description of the band and details on it's use. As you move your mouse over each band use detail, the frequency chart for that band is highlighted.
    • US Amateur Radio Privilages (Tech)
      • This is similar to the page on US Amateur Radio Privilages but only contains priviliges specific to the Technician class operator. This helps filter out some of the clutter on the other page.
    • Ham Q-Signals
      • List of Q-Signals commonly used on the ham bands. Q-Signals are short, three letter, abbreviations to help convey information with the shortest message possible.
    • Frequency and Wavelength
    • Wire Size Information
    • Wire Diameter/Area
    • Metric to/from Feet/Inch
    • Fraction/Decimal Conversion Tables