What are the advantages and disadvantages of TRF receiver?
i) It is the most simplest type of receiver because it does not require mixing and IF operation. ii) This type of receivers have good sensitivity. iii) It is very much applicable to recieve single frequency. i) The bandwidth of this receiver changes with center frequency.
What is the disadvantages of superheterodyne receiver?
One major disadvantage to the superheterodyne receiver is the problem of image frequency. In heterodyne receivers, an image frequency is an undesired input frequency equal to the station frequency plus (or minus) twice the intermediate frequency.
Why the selectivity of the TRF receiver is poor?
Selectivity of Tuned radio frequency (TRF) receiver is poor due to the following regions: The bandwidth of tuned circuits in the RF amplifier is variable, therefore the Q-factor of the RF amplifier is not fixed.
Which receiver is better TRF or superheterodyne?
Because the detector and amplifiers of a superheterodyne receiver can be designed to amplify only intermediate frequency (IF), this type of receiver is more selective and offer high fidelity (exact reproduction quality of the transmitted signal). In TRF receiver, amplification is not constant over the tuning range.
What are the advantages of TRF?
Its advantages are its simplicity and high sensitivity. Two or perhaps three RF amplifiers, all tuning together, were employed to select and amplify the incoming frequency and simultaneously to reject all others.
What are the drawbacks of a tuned radio frequency TRF receiver?
Drawbacks of Tuned Radio Receiver are The TRF receivers give unstable output as they have the tendency to oscillate at higher frequencies. The selectivity of the TRF receivers is poor to distinguish the desired signal from the undesired signal. With tuning range, there is variation in bandwidth with incoming frequency.
What is the cause of instability of RF amplifier in TRF receiver?
The interelectrode capacitance allows energy in the output circuit to feedback into the input. That feedback can cause instability and oscillation that frustrate reception and produce squealing or howling noises in the speaker.
Why many RF amplifiers are used in TRF receiver?
The detector requires a strong signal to work properly, so a high gain is required before it. In a TRF receiver all amplification is done at the incoming signal frequency, so it needs multiple RF amplifiers.
What is the major advantage of FM over AM?
The main advantages of FM over AM are: Improved signal to noise ratio (about 25dB) w.r.t. to man made interference. Smaller geographical interference between neighboring stations. Less radiated power.
What do you mean about TRF receivers?
tuned radio frequency receiver
A tuned radio frequency receiver (or TRF receiver) is a type of radio receiver that is composed of one or more tuned radio frequency (RF) amplifier stages followed by a detector (demodulator) circuit to extract the audio signal and usually an audio frequency amplifier.
What is the disadvantage of tuned RF receiver?
What are the advantages and disadvantages of the FM?
Advantages and Disadvantages of Frequency Modulation
|Power Consumption is less as compared to AM.||More complicated receiver and transmitter|
|Adjacent FM channels are separated by guard bands.||The antennas for FM systems should be kept close for better communication.|
What are the problems with a TRF receiver?
An additional problem for the TRF receiver is tuning different frequencies. All the tuned circuits need to track to keep the narrow bandwidth tuning. Keeping several tuned circuits aligned is difficult.
What are the disadvantages of TRF tubes?
Terman (1943, p. 658) characterizes the TRF’s disadvantages as “poor selectivity and low sensitivity in proportion to the number of tubes employed. They are accordingly practically obsolete.” Selectivity requires narrow bandwidth, and narrow bandwidth at a high radio frequency implies high Q or many filter sections.
What is the difference between TRF receiver and superheterodyne receiver?
In contrast a superheterodyne receiver can translate the incoming high radio frequency to a lower intermediate frequency where selectivity is easier to achieve. An additional problem for the TRF receiver is tuning different frequencies. All the tuned circuits need to track to keep the narrow bandwidth tuning.
What is the sensitivity of a receiver?
The receiver selects adjacent undesired frequencies with the desired frequencies due to variable bandwidth. Sensitivity of a receiver is defined as the ability of the receiver to amplify weak signals received by the receiver.