We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What Is a Transmission?

By Eric Tallberg
Updated May 23, 2024
Our promise to you
WikiMotors is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At WikiMotors, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject-matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

Simply put, a transmission allows power to be sent from a power source, most often an engine or motor, to a drive mechanism. It uses gears and a clutch to convert the speed of the power source into torque. A simpler one is often referred to as a gearbox since it is basically a box containing a configuration of gears.

The most common example is found in an automobile. There are two types of automobile transmissions: manual and automatic. Both accomplish the same function in turning engine speed or revolutions per minute (rpm) into torque (measured in pounds/feet). They also allow the drive mechanism to shift from forward into reverse without the need to shut off one engine and reverse the direction of the crankcase with a second engine running in the opposite direction.


In the case of a manual transmission, the flywheel, which is connected to the crankcase of the engine, runs at a constant speed. Through the use of a manually operated clutch and a shifter, engine power is reduced and increased significantly through the engagement or disengagement of a series of larger and smaller gears. This shifting of gears will avoid a correspondingly significant, inefficient, and potentially damaging increase of engine speed. These gears are running at different speeds because they are of differing sizes. Larger gears convert higher engine rpm into higher torque or energy at lower drive wheel speed by spinning more slowly than the crankcase; smaller gears, conversely, convert lower engine rpm into higher speed and efficiency by spinning faster than the crankcase.

Automatic transmissions, called transaxles in front wheel drive vehicles, accomplish exactly the same function through speed-torque conversion. A torque converter automatically engages and disengages the correct gears in the proper ratio using a system of bands engaging and disengaging the hydraulically operated clutch pack. This replaces the manually operated clutch. While manual gearing is in line, the gears in an automatic car are in a "planetary" arrangement, meaning they revolve around a stationary "sun" gear.


All of this is enabled through the use of gear reduction where larger gears that rotate more slowly are exchanged via the clutch or the torque converter for smaller, more rapidly rotating gears to increase the speed of the drive wheels. The reverse of the gearing exchange occurs with a need to decrease speed. Therefore, the speed of the power source, the engine or motor, is dampened or enhanced by the manual clutch or the torque converter and clutch pack to increase the efficiency of, as well as decrease the wear and tear on, the engine while providing the needed torque to the drive shaft.

Even such simple power sources as windmill vanes or the pedals on a three speed bicycle utilize a primitive transmission to transfer and partition the energy of the power source rpm into driving torque.

WikiMotors is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Link to Sources
Discussion Comments
By anon134311 — On Dec 14, 2010

Thinking back to my days at college, I remember the tuner output was converted to an intermediate frequency (IF) and the processing was done at this stage, a sound trap was fitted to separate video and audio signals.

A separate oscillator was used at 4.43 something or other mhz, this was the reference oscillator and separate oscillators where used for the field and line stages.

Long time since I thought about this. I'll probably keep thinking of more details now.

By anon37013 — On Jul 16, 2009

Ideally a tuner should not transmit anything as it is part of a TV Receiever. In reality it does have a oscillator (a very low powered transmitter) which mixes with the in coming TV signal from the broadcast transmitter tower to produce another frequency which the the TV receiver uses to process and give you a TV picture. If the TV tuner had perfect shielding no signal from this oscillator would escape and therefore it would not put out any signal to the outside world, i.e. it would not transmit anything. But as nothing is quite perfect a little bit of signal does escape the shielding and get to the outside world. So if you have a very sensitive Receiever and antenna you can pick up the TV tuners local oscillators signal but to do so you would you to be physically close to the TV tuner. Therefore its not very effective transmitter. So being a bad transmitter is something which the TV circuit designers strive to achieve.

By anon27336 — On Feb 26, 2009

which signal is transmitted by a television tuner?

WikiMotors, in your inbox

Our latest articles, guides, and more, delivered daily.

WikiMotors, in your inbox

Our latest articles, guides, and more, delivered daily.