Hi.
When a radio receiver is tuned to say, 100 MHz; its local oscillator is at say 110.7MHz, the mixer stage produces a 10.7MHz intermediate frequency for later demodulation.
If the broadcast ceases to emit, goes off the air;
Or, shifting tuning to a blank unoccupied frequency;
Or, shorting to ground the antenna input;
is 10.7MHz still present at the mixer output ?
And, do you know of an IC that can be used to detect the presence of 10.7 MHz ?
When a radio receiver is tuned to say, 100 MHz; its local oscillator is at say 110.7MHz, the mixer stage produces a 10.7MHz intermediate frequency for later demodulation.
If the broadcast ceases to emit, goes off the air;
Or, shifting tuning to a blank unoccupied frequency;
Or, shorting to ground the antenna input;
is 10.7MHz still present at the mixer output ?
And, do you know of an IC that can be used to detect the presence of 10.7 MHz ?