Welcome! I would like you to discuss about construction of aircraft band receiver. I thought about something like this: tunable band-pass filter, then HF amplifier on low noise Mosfet (as it has high input inpendance), mixer circuit the same as in TRX Alan 18, then 2 or 3 stages of IF amplifiers on BF194 or MCA1352. AGC equipped in function giving ability of selecting sensitivity LOC/DX, Of course if should has a digital scale for example on AT8902051 + prescaler on 2x74LS93. All tuned with triple-section variable capacitor as it has not own noises. What do you think about this?