Frequency Detector

Why do we measure in a detector the beat frequency and not the frequency of the carrier wave?

For example the police guns that use the Doppler effect, they meausure the beat frequency and not the carrier wave frequency, and my question is in the direction if, for example, the beat frequency overpowers the other frequency or any other phenomenon that ocurrs.

In case of police radar, it measures the difference between the transmitted frequency and the received frequency. This is a kind of frequency modulation.

In the case of AM radio, the receiver is tuned to the difference between the radio station and the internally generated intermediate frequency. It doesn’t detect the station frequency because it isn’t tuned to the station frequency.

Yaege FC-2 Handheld Frequency Counter 50MHz – 2.6GHz Portable radio Detector $48.99

GOOIT GY560 50Mhz to 2.4Ghz portable frequency counter detector handheld detect $24.90

GY-560 Frequency Counter Detector for radio 50 MHz ~ 2.4 GHz TH-UVF1 FD-450A $26.59

YAEGE FC-2 Portable Frequency Counter 50 MHz – 2.6 GHz Detector FC2 for KG-UVD1P $48.50

FC-1 Frequency Detector 10Hz-2.6GHz for ham radio FC1 $51.80

Radio Portable Frequency Detector + Power Meter GY-561 $41.25

NEW – STARTEK ATH-60 FREQUENCY COUNTER – RF DETECTOR $220.00

OPTOELECTRONICS CUB Frequency Counter Bug Detector NEW! $189.00

There are many hidden cameras and audio recording devices at all in our society. There are many people who like have the ability to detect a hidden camera or microphone, to ensure your privacy. So, now you can tell if someone is watching, and / or listening discussions with an error detector or frequency detector.

Bug or frequency detectors are usually handheld, battery-sized devices from a deck of playing cards. They have a small antenna, and you can walk around a room or an area of "sweep" for any item put a little radio frequency energy. Most hidden cameras and microphones operate by using a very small radio transmitter to send sound or image back to a recording unit, so the hidden camera or microphone emits a signal via radio frequency and this can be detected with an error detector.

Most error detection using the newest micro processor circuitry for more accurate detection of wireless transmission, and which will have an LCD screen to display the actual frequency being detected. Or an error detector may have a power meter to show the strength of the radio signal received. A decent hand held bug detector may be exactly what you need, and you can expect to spend three hundred dollars or more for this amazing and much needed technology.

Failure detectors and hidden cameras and other monitoring elements not usually found in large stores, due to its cost and the fact that are a specialty, however, can be found from a line retailer offering quality merchandise of this type. My name is Father Time, writer and owner of a fabulous Online Superstore. I have an error fantastic detector in my room web, and a detector impressive frequency for your convenience. I also have several fabulous Complete Home Surveillance! So please visit and take a look!

Many blessings!

About the Author:

Father Time has been a published writer for over thirty years and particularly focuses on motivational and self-help writing and speaking! He also has many years of sales experience and writes sales & marketing training and materials.

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Article Source: ArticlesBase.com – James Bond Would Love These Modern Day Bug And Frequency Detectors