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When the SPST switch (S1) is open, Q4 is on and is grounding the LEDs at the input of the 3.547 MHz crystal filter. 12 Volts goes through a 250uH choke, an LED (& 1K current limiting resistor), an IRED, (& 470 ohm current limiting resistor) and through Q4 to ground. Also, when Q4 is on, the gate of Q5 is grounded, turning Q5 off. When the SPST switch (S1) is closed, the gate of Q4 is grounded, turning off Q4. 12 Volts flows through the LEDs and brings the gate of Q5 to 12 volts, turning Q5 on. Since the gate resistance is so high, on the order of megohms, no current flows and the 3.547 MHz LEDs cannot turn on. Q5 is turned on, passing 12 Volts through a 100 ohm resistor and 250uH choke, turning on the LEDs at the 4.000 MHz crystal filter. Control Center of ReceiverThe IREDs at the crystal filter are the main control center of the receiver. Operation of 40 and 20 MetersThe 3.547 IRED pointed to the phototransistor at the VFO amplifiers turns on the 10.545 VFO relay. If the bandpass filter is switched to the 40/30 position, then 40 meters can be tuned in with the bandpass tuning pot and the VFO starts tuning at 10.545MHz. The crystal oscillator is running at 4.000 MHz, its default frequency. If the 20/17 position on the bandpass filter switch is chosen, an IRED at the bottom of the 20 meter bandpass filter turns on a photodiode that activates the 10.455 VFO relay. The bandpass pot can now tune in 20 meters. Both LEDs at the VFO will be turned on, indicating that the VFO is running at 10.455 MHz.
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