Anonymous asked in Science & MathematicsPhysics · 1 decade ago

Receiver overload what does this mean?

Quote Receiver overload is common type of interference .It happens most often to consumer electronic equipment near transmitter.When the RF signal ( at the fundamental freqency ) enters the receiver it overloads one or more circuits.The receiver front end ( first the RF amplifier stage after the antenna ) is most commonly affected .For this reason we call this front end overload or RF overload .

A strong enough front end overload field may produce spurious signals in the receiver which may cause interference . Quote

What does this mean and what is spurious signals interference ? Can other people radio get this interference ?

Because we are getting channels bleeding in on are taxi fleet of radios by other users using frequency very close to the one we use. When some one press the mike to talk some times channels bleed in for short time no more than 5 to 10 seconds and in 10 hour shift this may happen 2 or 3 times.It seems to happen more when some one try to talk to dispatch or dispatch try to talk to the fleet.It is a channels bleed in from the other frequency very close to the frequency we use.Even some times are channels bleed in two !! The dispatcher is talking on channel 1A and we can hear it on channel 1B .Note this channels bleed over is very short no more than 5 to 10 seconds and in 10 hour shift this may happen 2 or 3 times.

Is it are radios the problem ? a transmitter or receiver overload ?

1 Answer

  • 1 decade ago
    Favorite Answer

    You are getting too much energy at the receiver, i.e. at the antenna. Normally the receiver has a filter which will remove unwanted frequencies from the received energy, but if you have too much input the filter is "saturated" and the filter won't work properly.

    "Spurious signals" means some of that energy which wasn't actually supposed to be in your channel makes it through the filters as if it were in the channel.

    I'm not an RF engineer so I don't know what's the easy way to reduce this, unless it's to put an attenuator between the antenna and the receiver (obviously this is something an engineer would need to do).

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