A superheterodyne receiver is to tune the range 88.1MHz to 107.1MHz. The RF circuit inductance is 1μH. Low-side injection is used. a. Calculate the minimum capacitance of the variable capacitor in the RF circuit b. Calculate the RF circuit capacitance tuning ratio c. If the receiver has a single converter stage and IF of 800kHz, calculate the capacitance tuning ratio of the local oscillator
A superheterodyne receiver is to tune the range 88.1MHz to 107.1MHz. The RF circuit inductance is 1μH. Low-side injection is used.
a. Calculate the minimum capacitance of the variable capacitor in the RF circuit
b. Calculate the RF circuit capacitance tuning ratio
c. If the receiver has a single converter stage and IF of 800kHz, calculate the capacitance tuning ratio of the local oscillator
d. If the maximum capacitance of the variable capacitor of the local oscillator is 0.2pF, calculate the minimum capacitance
e. If the receiver has a single converter stage and IF of 800kHz, calculate the image frequency of 103.7MHz
f. Calculate the IFRR (in dB) of (e) if Q of the preselector is 50
g. To increase the IFRR of (e) to 40dB, double conversion is used. What must be the frequency of the 1st IF?
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