Why intermediate frequency is 455 khz
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In most of the receivers, this unit produces good results and in some of the receivers, it becomes useless due to differences in intermediate frequency. With proper tuning of trimmer capacitor, this unit may be able to produce exact 455.000 kHz output and its waveform is closer to a 2V pp square wave (on 5V DC power source).
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If a receiver mixes a 13.800 MHz VFO with a 14.255 MHz received signal to produce a 455 kHz intermediate frequency (IF) signal, what type of interference will a 13.345 MHz signal produce in the receiver? A. Quadrature noise B. Image response C. Mixer interference D. Intermediate interference
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The 10.7 and 455 kHz IF frequencies are more "historic" choices for superheterodyne receivers. The choices for these frequencies might have to do with availability of components (filters etc.) and/or frequency of the LO signal. To receive for example a 100 MHz FM station, when IF = 10.7 MHz the LO can be either 89.3 MHz or 110.7 MHz.
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LO frequency selection: we always have 2 choices. image rejection and oscillator implementation affect the choice 1. FLO1 = FRF-FIF 530 - 455 = 75 KHz 1700 - 455 = 1245 KHz 2. FLO1 = FRF + FIF 530 + 455 = 985 KHz 1700 + 455 = 2155 KHz LO choice #1 requires a 16.6 to 1 tuning range for the LO; #2 only requires 2.2 to 1.
As the audio frequencies range from 20 Hz to 20 kHz, therefore, if they are transmitted directly into space, the length of the transmitting antenna required would be extremely large. Let us illustrate sideband frequencies with an example. Suppose the carrier frequency is 400.The local oscillator is tuned to 580 + 455 = 1035 kHz. But a signal at 580 + 455 + 455 = 1490 kHz is also 455 kHz away from the local oscillator; so both the desired signal and the image, when mixed with the local oscillator, will appear at the intermediate frequency. This image frequency is within the AM broadcast band.
needs to be converted to a 455-kHz intermediate frequency (IF) for selective amplification. The incoming signal at 27.125 MHz is mixed with the local oscillator's signal at 26.670 MHz. This results in a "sum" frequency at 53.795 Mhz (this is rejected by the IF filters) and a "difference" frequency at 455 kHz. The 455-kHz signal is amplified, Jan 26, 2008 · 455 kilohertz is the intermediate frequency used in virtually all r/c receivers as well as many other types of radio receivers. The crystal in a typical single conversion receiver oscillates on a frequency 455 kilohertz (which is the same as .455 megahertz) away from the frequency being received. Intermediate Frequency: 10,7 MHz and 455 kHz Tone decoder/PLL SE567: No: Pass band of the 2-st.IF filter: 30 kHz/ - 3 dB (or alternately 15 kHz form 144 - 146MHz) Power: DC 9 V (max.12 V) Current output:
needs to be converted to a 455-kHz intermediate frequency (IF) for selective amplification. The incoming signal at 27.125 MHz is mixed with the local oscillator's signal at 26.670 MHz. This results in a "sum" frequency at 53.795 Mhz (this is rejected by the IF filters) and a "difference" frequency at 455 kHz. The 455-kHz signal is amplified, Jan 01, 2008 · High frequency radio signals are changed to the lower intermediate frequency by a FREQUENCY CHANGER circuit. The i.f in A.M. radios is about 455 KHz. In F.M. radios it is 10.7 MHz. RADIO FREQUENCY amplifiers amplify a selected band of frequencies. Radio frequencies extend from about 30 KHz up to several thousand MHz. Apr 16, 2013 · b) In a broadcast superheterodyne receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz, calculate image frequency and its rejection ratio. 4 at 1000 kHz. 11) at 25 MHz. 4
IF = intermediate frequency f LO 0 f in 0 0 f LO-f in f LO +f in f LO. Page 12 IF FILTER Input ... center frequency 7.5 kHz 60 dB. Page 31 Residual FM "Smears" the ... Intermediate frequencies: 144 MHz: 1st: 41.8 MHz; 2nd: 455 kHz 430(440) MHz: 1st: 42.25 MHz; 2nd: 455 kHz 1200 MHz: 1st: 72.2 MHz; 2nd: 455 kHz ; Spurious response rejection: More than 60 dB (except 1/2 intermediate frequency) Audio output power: More than 2.4 W at 10% distortion with the internal speaker.
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