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The Truth about Digital Modulation

Certain Hidden Fence companies advertise their products as offering DM, or “Digital Modulation”. They describe this as the most modern and up-to-date radio transmission technology for Hidden Fence systems. The “next generation” that is newer & better than even FM radio.

The educated customer needs to be informed that this is nothing more than marketing hype on the part of these organizations. Please, don’t be misled…

Digital Modulation (DM) is a radio signal processing technology used to send and receive information over FM (Frequency Modulation), or AM (Amplitude Modulation) radio waves. It's commonly used today in almost any device that performs some type of communication. Everything from cell phones to Hidden Fences function by sending "digitally modulated" signals over an FM or AM radio band. Although DM is based on AM/FM radio technology, it is NOT a next generation replacement for it. Rather...

Digital Modulation is the "digital" form of AM/FM radio.

Everyone is familiar with the differences between AM and FM radio. It’s widely known that FM signals are far more clear and secure than AM signals. This is why FM music plays over the radio with no static (at all...) and fire/police departments, air traffic controllers, etc. all communicate exclusively over FM channels. Bottom line; digital FM is superior to digital AM.

When applied to a Hidden Fence system, digital AM based systems are constantly subjected to interference inherent to that technology. The end result is a digital AM system that's prone to "misfire", shocking your pet indiscriminately. This can lead to a confused and frightened animal.

A digital FM Hidden Fence system doesn’t respond to radio wave interference and therefore is safest for your pet.

Digital Modulation (DM) is the radio signal processing technology used by ALL Hidden Fence products available on the market today. No matter if the product is based on AM or FM radio, DM is the technology used to process the transmissions. There is nothing special or unique about the use of DM within the Hidden Fence industry. All products available today use this technology.

The reason certain Hidden Fence companies make a big deal about offering Digital Modulation is because their products are actually AM radio based.

Since digital AM radio is inferior to digital FM, these companies are forced to use marketing hype in an attempt to compete against the ONLY Hidden Fence company in the entire industry that offers an FM radio based product; DogWatch®. By drawing attention to a commonly applied technology (DM) and making it “sound” like an advancement that differentiates their product, these companies are attempting to divert attention away from their greatest weakness; an AM radio based product.

Fortunately, an educated customer will see right through this. DM is NOT a next generation, "advanced" radio technology being offered by specific Hidden Fence companies. Rather…

ALL Hidden Fence companies use Digital Modulation throughout their entire product line(s).

Your car radio is a good illustration of this. Installed in each (late model) automobile is a “digital” AM/FM radio. Regardless if the channel you tune to is AM or FM a “digital” (DM) radio is processing the incoming signal, providing you with something to listen to.

Also, no matter who manufactured your car (Ford, BMW, Toyota, etc), the radio is using a form of Digital Modulation to interpret the AM or FM radio signals. What makes one car radio sound better than another often comes down to simply tuning it to an FM station rather than an AM station. Similarly…

What makes one Hidden Fence product better than another is simply the type of radio modulation it uses; FM vs. AM…


Note: Anyone interested in getting closer to the technical details of this subject can visit a number of different sites that provide more information:

- Digital Modulation
- Transmission and Reception of Radio Waves
- Digital Radio - The Sound of the Future
- DogWatch FM Patent

©2012 Dogwatch of Susquehanna Valley Inc.
DogWatch Hidden Fences should not be confused with Dog Guard, Pet Stop, Invisible Fence® or
Invisible Fencing® which are products and registered trademarks of Invisible Fence, Inc.

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