RF Cafe Homepage

Search AAR WebsiteSearch Airplanes and Rockets Website

 Copyright 2007-2030

Articles & Plans

Airplanes | Rockets | Kits

Boats | Cars | Trains

Helicopters | Electronics

Website

Host: Kirt Blattenberger

AMA 92498 | KB3UON

Sitemap | About AAR

Homepage Archive

Building & Flying 

Hints & Tips

Balsa | Airfoils

Silkspan & Dope

Engines & Motors

Air Modeling

C/L Capers | Ads

Model Rocketeer

Jetex | Cox | CO2

Personal Stuff

My Models | Radios

Woodworking

Astronomy | Peanuts

Suzy Homemaker

Parole Plaza | Photos

Just for Fun 

Comics & Humor

Crosswords | Stories

Vintage Magazine Articles 

American Modeler | Air Trails

American Aircraft Modeler

RC Modeler | Flying Aces

Boy's Life | Young Men

Saturday Evening Post

Pop Science | Pop Mechanics

Pop Electronics | Aero-Modeller

A Few Items for Sale

R/C Servo Timing Waveform Video

R/C Servo Pulse Timing Waveform - Airplanes and RocketsFinding written information about almost any subject on the Internet is usually not too hard to do, but finding a good video that demonstrates the concept can be a challenge. Such is - or was - the case for learning how the timing waveform for an R/C servo works. Here is a short video that shows how the pulse that control servo position varies in width between 1.0 and 2.0 milliseconds (ms) over the full travel range of the servo. That 1.0 millisecond width includes the full range of the transmitter stick and the trim tab. I have seen comments on forums from people who were only measuring around 1.2 to 1.8 ms, so my guess is that they were not including trim tab range.

The pulse repetition rate is approximately once every 20 milliseconds. The diagram shown below illustrates what you see in the video where the Channel 1 pulse varies between 1.0 and 2.0 ms over the full transmitter stick + trim range. You will also see in the video how each successive channel's pulse begins where the previous one ends. For example, Channel 2's pulse begins at the end of Channel 1's pulse, regardless of whether it is 1.0 ms, 1.5 ms, 1.75 ms or 2.0 ms, and it remains at its original width unless Channel 2 is varied at the same time as Channel 1. This control scheme is known as pulse width modulation (PWM).

Radio Control System Servo Waveform

 

 

Posted April 26, 2010

About Airplanes & Rockets 

Kirt Blattenberger, Webmaster - Airplanes and RocketsKirt Blattenberger

Carpe Diem! (Seize the Day!)

Even during the busiest times of my
life I have endeavored to maintain
some form of model building activity.
This site has been created to help me chronicle my journey through a lifelong involvement in model aviation, which all began in Mayo, MD ...

Copyright 1996 - 2030

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the Airplanes and Rockets website are hereby acknowledged.

Webmaster:                         Family Websites:

Kirt Blattenberger                 RF Cafe

BS Electrical Engineering       Equine Kingdom

Amateur Radio KB3UON

Model Aircraft Museum, AMA - Airplanes and Rockets