MARTINDALE'S
CALCULATORS ONLINE CENTER PART I: FH HAM RADIO ACOUSTICS, NOISE EXPOSURE, SOUND, MICROPHONE & SPEAKER DESIGN (Calculators, Applets, Spreadsheets, and where Applicable includes: Courses, Manuals, Handbooks, Simulations, Animations, Videos, etc.) 
FOR MORSE CODE CALCULATORS SEE CALCULATOR CENTER PART I AE: MORSE CODE AMATEUR RADIO PRACTICE EXAM
Amateur Radio Licensing
HAM RADIO ONLINE PRACTICE EXAMS  HamTestOnline VERY VERY EXTENSIVE. Ham Radio Practice Exams include:
General Class Practice Exam; Extra Class Practice Exam; Customize a Practice Exam..." HAM RADIO PRACTICE EXAMS  eHam.Net VERY EXTENSIVE. Ham Radio Practice Exams
General Ham Radio Practice Exam; Extra Ham Radio Practice Exam..." COMMERCIAL OPERATOR LICENSE EXAM
Commercial Operator License Program
Amateur Radio Design
AMATEUR RADIO AND DX REFERENCE GUIDE  Rod Dinkins  AC6V VERY VERY VERY...EXTENSIVE. For more information see Amateur Radio and DX Reference Guide HAMRADIO, SHORTWAVE & CBRADIO GUIDE  The DXZone.com Ham radio guide VERY VERY VERY...EXTENSIVE. AMATEUR RADIO DESIGN CALCULATORS  Gábor HG9IEG VERY VERY VERY...EXTENSIVE. In English & Hungarian.
Asymmetric T attenuator Calculator Capacitance and Resistance  from Inductance and Time Constant Calculator Capacitance  from Frequency, Current and Voltage Calculator Charge and Voltage  from Capacitance and Energy Calculator Conductance, Current, Power, Resistance, Voltage Calculator Current  from Capacitance, Frequency and Voltage Calculator Energy and Inductor Flux  from Current and Inductance Calculator Frequency  from Capacitance, Current and Voltage Calculator Inductance and Time Constant  from Capacitance and Resistance Calculator Length of Side of Square  from Inductance and Number of Turns Calculator Parallel Conductance Calculator Partial Resistance  from Serial Resistance Calculator Resistance: Delta  from Star (Y) Calculator Serial Power Amplifiers Calculator Voltage  from Capacitance, Resistance, Time and Voltage Calculator
Antenna EiRP Estimator Calculator INPUT Values include:
Coax Type
Quad Loop; 3, 3 & 4 Element Quad; Other..." SingleLayer Coil Designer SingleLayer Coil Designer Calculator INPUT Values include:
Required Inductance; Dust Core (Yes or No)..." OpAmp Circuit Design OpAmp Circuit Design Calculator INPUT Values include:
Zener Diode Selector Zener Diode Selector Calculator INPUT Values include:
Required Output Voltage; Maximum Load Current..." COIL CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
SINGLELAYER COIL DESIGNER CALCULATOR  J. Owen, Wirral Peninsula, County of Merseyside, U.K. SingleLayer Coil Designer Calculator INPUT Values include:
SINGLE LAYER AIR COIL INDUCTANCE CALCULATOR  Darryl Boyd Single Layer Air Coil Inductance Calculator INPUT Values include:
Coil Diameter; Number of turns; Coil Length; etc..." CONVERT & CORRECT DIAL READINGS CALCULATORS & APPLETS
Convert GR821A readings to admittance/impedance Applet
VSWR CALCULATORS & APPLETS
VSWR Calculator INPUT Values include:

ANTENNA SYSTEMS COURSES, LESSONS, PROJECTS & DATABASES INTRODUCTION TO WAVE PROPAGATION, RADIO WAVE PROPOGATION, PRINCIPLE OF TRANSMISSION LINES, AND ANTENNAS  Naval Electrical Engineering Training Series & Hosted by Integrated Publishing Multimedia Wave Propagation, Radio Wave Propagation, Principles Of Transmission Lines, & Antennas Course, Glossary, etc. (Text, Images, Animations & Simulations). VERY VERY VERY...EXTENSIVE. Introduction to Wave Propagation, Transmission Lines, and Antennas
Current And Voltage Distribution On An Antenna; Radiation Of Electromagnetic Energy; Antenna Characteristics; Polarization; Radiation Resistance; Isotropic Radiation; Anisotropic Radiation; Antenna Loading; Basic Antennas; Folded Dipole; Array Antennas; etc..." AMATEUR RADIO, DX REFERENCE GUIDE, ANTENNA CALCULATORS, PLANS, ETC.  Rod Dinkins  AC6V VERY VERY VERY...EXTENSIVE. For more information see Amateur Radio and DX Reference Guide HAMRADIO, SHORTWAVE & CBRADIO GUIDE, ANTENNA CALCULATORS, PLANS, ETC.  The DXZone.com Ham radio guide VERY VERY VERY...EXTENSIVE. TNETWORK TUNER CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
TNetwork Tuner Simulator
YAGI ANTENNA CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
Yagi Modeler
Call Sign
CALLSIGN DATABASE SERVER  Amateur Radio Club, University of Arkansas, Little Rock, Arkansas U.S. Amateur Radio Callsign
Distance & Location
Grid Location
SOME EXAMPLES OF GRID LOCATION CALCULATORS & APPLETSINCLUDE FIND OUT WHERE YOU ARE!  Alun Jones, Institute of Biological Sciences, University of Wales, U.K. VERY EXTENSIVE. Find out where you are!

APPLIED ACOUSTICS  Elsevier B.V. Multimedia Applied Acoustics Journal (Text & Images). BUILDING ACOUSTICS  MultiScience Publishing, U.K. Multimedia Building Acoustics Journal (Text & Images). THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA  Acoustical Society of America, Published by: Harcourt International Multimedia Journal (Text & Images). For more information see the Acoustical Society of America JOURNAL OF COMPUTATIONAL ACOUSTICS  World Scientific Pulishing Co. Multimedia Computaional Acoustics Journal (Text & Images). INFRASOUND
Infrasound
Infrasound Arrays; Volcano Infrasound; Bolide Infrasound; Surf Infrasound; etc..." INDOOR AND OUTDOOR AUDIO & VIDEO ACOUSTICS & AUDIO SYSTEMS CALCULATORS & APPLETS
ACOUSTICAL ENGINEERING CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS ACOUSTIC CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS AUDIO CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS FOR RELATED ACOUSTICS COURSES, LESSONS, TECHNICAL REPORTS, CALCULATORS, ETC. SEE
OR LIVE PERFORMANCE, STATE & THEATER CALCULATORS & APPLETS ACOUSTICS CALCULATORS FOR THE INTEGRATION OF SOUND AND VIDEO SYSTEMS  M^{c} Squared System Design Group, North Vancouver, BC, Canada VERY VERY VERY...EXTENSIVE. M^{c} Squared System Design Group is
Decibels and Distance Calculator
Quickie 2kHz Reverb Time Calculator Quickie 2kHz Reverb Time Calculator will
Room Mode Calculator Room Mode Calculator
The Speech Intelligibility Calculator Speech Intelligibility Calculators include
Speaker Details Calculator; Listener Details Calculator; Reverb Time Calculator; Critical Distance Calculator; Percentage Articulation Loss of Consonants (%ALCONS) Calculator..." Wavelength of Sound Calculator Wavelength of Sound Calculator
Some examples from over "60" Audio Calculators include
Sound Pressure and Intensity Levels Calculator; Ohm's Law as Acoustic Equivalent for Plane Progressive Waves Calculator; Decibel Calculator; Reactance Calculator of C and L; Damping of bridging and damping factor Calculator; Reverberation Time <> Sound Decay Rate Calculator; etc. MUSIC ACOUSTICS & VIBRATIONS WITH ANIMATIONS, VIDEOS/MOVIES & AUDIO/SOUND
FOR RELATED MUSIC ACOUSTICS & VIBRATIONS CALCULATORS SEE MUSIC CALCULATORS ACOUSTICS & VIBRATIONS (QUICKTIME)  D.A. Russell, Graduate Program in Acoustics, The Graduate School at Penn State & the College of Engineering, Pennsylvania State University Multimedia Acoustics and Vibration Lessons, Technical Reports, etc. (Text, Images, Animations, Videos/Movies & Audio/Sound). VERY VERY VERY...EXTENSIVE. Examples of "Acoustics & Vibration" Subject Categories include
Sound Waves and Radiation from Sources; Complicated Wave Phenomena; Room Acoustics; Vibration of 1DOF Simple Oscillators; Vibration of MultiDOF Systems; etc..."
Modal Analysis of an Electric Guitar
to study the vibration of an electric guitar in order to determine its natural frequencies and mode shapes..." Refraction of Sound Waves Refraction of Sound Waves
Sound Fields Radiated by Simple Sources Sound Fields Radiated by Simple Sources include
Radiation from a dipole source; Radiation from a lateral quadrupole source..." Acoustics of Baseball Bats Acoustics of Baseball Bats
Examples of "Music Acoustics" Subject Categories include
Flute Acoustics; Clarinet Acoustics; Saxophone Acoustics; Brass Acoustics; Didjeridu Acoustics; Violin Acoustics; Guitar Acoustics; Voice Acoustics; etc..."
Test your Hearing
"...Results using this test cannot be regarded as clinical data. Although the sound files have been carefully prepared, the actual sound level and spectral purity depend on the frequency response of your sound card and headphones. They may, however, be helpful for comparison, such as left vs right ear, or for changes in hearing over time, assuming that you use the same hardware..." What is a Sound Spectrum? Sound Spectrum
Saxophone Acoustics Saxophone Acoustics
Flute Acoustics Flute Acoustics
ROOM ACOUSTICS CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
REVERBERATION TIME CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS Room Acoustics Calculators ROOM ACOUSTICS CALCULATOR (JAVA APPLET)  Hunecke Consult, Germany VERY VERY VERY...EXTENSIVE. Available in English, Dutch/Nederlands, French/Français, German/Deutsch & Polish. Room Acoustics Calculator
Rehearsal Room, Film Theater, Office, Airport, Museum, etc..."
Bare Floor; Floor Coverings; Walls; Windows; Furniture for:
ACOUSTICS CALCULATOR  MBI Products Company, Inc., Elyria, Ohio Multimedia Acoustics Calculator: A basic estimator for your reverbation goals (Text & Images). VERY EXTENSIVE. For more information see MBI Products Company Room Eigenmodes Calculators ROOM EIGENMODES CALCULATOR (JAVA APPLET)  Hunecke Consult, Germany VERY VERY EXTENSIVE. Available in English, Dutch/Nederlands, French/Français, German/Deutsch & Polish. Room Eigenmodes
Reverberation Calculators REVERBERATION CALCULATOR  Armstrong World Industries Multimedia Reverberation Calculator (Text, Images & Audio/Sound). VERY VERY VERY...EXTENSIVE. Reverberation Time
Describe your Space.
Enter number of objects in Space. REVERBERATION TIME CALCULATOR   M^{c} Squared System Design Group, North Vancouver, BC, Canada Multimedia Reverberation Calculator (Text & Images). VERY VERY EXTENSIVE. Reverberation Calculator

INDUSTRIAL NOISE NOISE CALCULATORS & APPLETS ROAD TRAFFIC NOISE CALCULATORS & APPLETS NOISE CALCULATOR FOR WILDLIFE SOUND RECORDING  Megalithia Noise Calculator for Wildlife Sound Recording
Recorder (Minimum signal for 0dBFS; Maximum signal before clipping; Self Noise)..." NOISE EXPOSURE CALCULATORS (SPREADSHEETS OPEN ONLINE WITH EXCEL, iWORKNUMBERS, IBM LOTUS SYMPHONY, NEOOFFICE, OPENOFFICE CALC, ETC.)  Health and Safety Executive, U.K. Government VERY VERY EXTENSIVE. Noise Exposure Calculators include:
Weekly Noise Exposure Calculator; Hearing Protection Calculator..." DAILY NOISE CALCULATOR  Tony Woolf Acoustics, U.K. Daily Noise Calculator
NOISE EXPOSURE CALCULATORS  Rigolett, The Netherlands VERY VERY VERY...EXTENSIVE. For more information see Noise & Traffic
Road Traffic Noise Calculator
Average Number of Noiseinduced Awakenings Calculator Average Number of Noiseinduced Awakenings Calculator
Calculations with Sound Power Level for Industrial Areas Calculations with Sound Power Level for Industrial Areas
Sound
CALCULATION OF SPEED OF SOUND IN HUMID AIR  CALCULATOR  National Physical Laboratory (NPL), U.K. VERY EXTENSIVE. Speed of Sound in Humid Air Calculator
Absorption of Sound by the Atmosphere CALCULATION OF ABSORPTION OF SOUND BY THE ATMOSPHERE  CALCULATOR  National Physical Laboratory (NPL), U.K. VERY EXTENSIVE. Absorption of Sound by the Atmosphere Calculator
Absorption of Sound in Seawater CALCULATION OF ABSORPTION OF SOUND IN SEAWATER  CALCULATOR  National Physical Laboratory (NPL), U.K. VERY EXTENSIVE. Absorption of Sound in Seawater Calculator
SPEED OF SOUND IN PURE WATER CALCULATORS & APPLETS
Speed of Sound in Pure Water Calculators include:
(2) Marczak Equation for Speed of Sound as a Function of Temperature only Calculator; (3) Lubbers and Graaff's Simplified Equations for Speed of Sound as a Function of Temperature only Calculator; (4) Belogol'skii, Sekoyan et al Equations for Speed of Sound as a Function of Temperature and Pressure Calculator SPEED OF SOUND IN SEAWATER CALCULATORS & APPLETS
Speed of Sound in SeaWater Calculators include:
2 Interactive Versions for Pressure or Depth..."
Speed of Sound in SeaWater Calculator: Del Grosso's equation: Wong and Zhu (An alternative equation to the UNESCO algorithm) Speed of Sound in SeaWater Calculator: Mackenzie Speed of Sound in SeaWater Calculator: Coppens Presure to Depth in SeaWater Calculator: Leroy and Parthiot SPL CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
SOUND PRESSURE LEVEL CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS SPL CALCULATOR (SOUND PRESSURE LEVEL CALCULATOR)  C.M. Collins VERY EXTENSIVE. SPL Calculator  Sound Pressure Level Calculator
Amplifier Power; Distance; Number of Speakers; Speaker Placement (Away from walls, Near a wall or In a corner)..." SOUNDSCAPES  SEEING WITH YOUR EARS CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
The vOICe Interactive Sound Applet  Draw your own Sound

MICROPHONE CALCULATORS  Eberhard Sengpiel, Germany Available in English & German/Deutsch. VERY EXTENSIVE. Microphones
Speaker Design
HOW A SPEAKER WORKS (JAVA APPLET)  Java programming: K.I. Tchourioukanov; Author: M.W. Davidson, Molecular Expressions: Exploring the World of Optics & Mircroscopy, Florida State University How a Speaker Works
"...The current, alternating at the same frequency as the sound waves that generated it, induces an alternating magnetic field in the coil. As the polarity of the magnetic field of the coil alternates, it is alternatively attracted to and repelled by the permanent magnet. This causes the coil to vibrate. The vibrating coil causes..." CIRCUIT, BOX & SPEAKER DESIGN LESSONS, CALCULATORS, ETC.
Speaker Design
Speaker Wiring; Home Theater Speakers; etc..."
2way Crossover Designer Calculator; 3way APC Crossover Designer Calculator; Series Notch Filter Calculator; Parallel Notch Filter Calculator; Driver Attenuation Circuit Design Calculator; Inductor Designer Calculator; etc...."
Speaker Box Designer Calculator INPUT Values include
Series Notch Filter Designer Series Notch Fliter Designer Calculator INPUT Values include
Impedance Equalization (Zobel) Circuit Designer Impedance Equalization (Zobel) Circuit Designer Calculator INPUT Values include
CROSSOVER CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
Examples of Crossover Calculators include
Narrow Band Pass Crossover Calculator; Zobe Passive Crossover Calculator; etc..." LOUDSPEAKER DESIGN CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
Loudspeaker Calculator
Rehearsal Room, Film Theater, Office, Airport, Museum, etc..."
Bare Floor; Floor Coverings; Walls; Windows; Furniture for

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