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Q: What is the effect of the RF signal if it reaches the superheterodyne receiver?
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How are electrical signals turned into data in microwave transmission?

This is usually done by modulating a much lower frequency carrier with the signal, then superheterodyning this carrier upconverting it into the desired microwave band. A corresponding superheterodyne receiver downconverts the microwave signal to a lower intermediate frequency which is then demodulated to recover the original signal.


What is near far effect in CDMA?

in cdma The near-far problem is a condition in which a receiver captures a strong signal and thereby makes it impossible for the receiver to detect a weaker signal


The ability of an FM receiver to lock onto the strongest signal is called?

capture effect


What effect will increasing the required transmission distance have on transmitting the signal clearly?

Increasing the required transmission distance of a signal will have a negative effect on the clearness of the signal. As the source is moved farther away from the receiver, a weaker signal will be present.


What is the difference between a Superheterodyne and a Neutrodyne radio receiver?

The superheterodyne converts the desired incoming signal frequency to an (usually lower) intermediate frequency before demodulating it and extracting the audio signal (or video/data, etc).The neutrodyne is a tuned radio frequency design where all amplifying stages operate at the incoming signal frequency. This was the commonest design up to the 1930s. The triode amplifiers used suffered from signal feedback, where a signal from the amplifier's output was coupled back to its input. This could cause the amplifier to act like a transmitter and to oscillate. Neutralization (with capacitors) was invented to prevent this problem and the circuit was named the "neutrodyne".


What are oscillators used for?

Signal generators: reference (tuning equipment) source - such as electronic keyboards beat frequencies - as in a superheterodyne radio


What is utrasonic intruder alarm?

A signal usually 30khz to 40khz is send out and a receiver will detect this frequency. An intruder by merely disrupting this signal [phase shift as in Doppler effect] and cause the receiver to detect a phase shift and sound an alarm of sort.


What is a super heterodyne receiver?

A superheterodyne receiver is a Radio Frequency receiver method that multiplies the received signal frequency with a local oscillator frequency to get frequencies that are the sum and difference of the 2 frequencies. For example, if the received signal is 5MHz and the local oscillator frequency is 4MHz, they are multiplied together. 1MHz and 9MHz frequencies would be gotten. Usually the 1MHz is the Intermediate Frequency (IF). It will be admitted (through a band pass filter) later passed through the required electronic circuits for proper processing. There is also the method of the Variable Tuned Filter.


What is the effect of carrier frequency variation on AM signal?

If the modulation is to large your bandwidth will be to wide in other words the frequency shift will be larger than normal that will result in a distorted audio signal at the receiver


How does the near and far effect influence TDMA systems?

The near-far problem is a condition in which a receiver captures a strong signal and thereby makes it impossible for the receiver to detect a weaker signal. There is a long-standing issue that the dynamic range of one or more stages of a receiver can limit that receiver's ability to detect a weak signal in the presence of strong signal. The near-far problem usually refers to a specific case of this in which ADC resolution limits the range of signals a receiver can detect in a direct sequence spread spectrum (DSSS) system such as CDMA. The receiver's AGCmust reduce its gain to prevent ADC saturation, which causes the weaker signal to fall into the noise of the ADC. This is different from a condition of one signal interfering with another because if the ADC had sufficient resolution, it would be possible to recover both signals. By contrast,TDMA systems are less vulnerable.


Difference between strobe and handshake signal?

A strobe signal is sent by the signal sender without any regard to the signal receiver. This assumes that the design provides sufficient setup and hold time, along with transmission time, to ensure reliable receipt of the signal. A handshake signal is a bi-directional protocol between the signal sender and the signal receiver, which the receiver uses to tell the sender that the signal has been received. In this system, it often does not matter what the transmission time is, but bandwidth can be reduced since the sender must wait for the handshake to come back from the receiver, effectively doubling the time it takes to send a signal.


Why do LNB's have to be mounted close to the satellite dish?

The LNB takes the signal reflected off the dish, sends that signal through the coax cable to the receiver, where the receiver decodes the signal unlocking the channels you subscribe to.