Hi again
Well , no problem , sorry if my last notes weren't clear . As you probably know , first stage is an oscillator , it will oscillate at your carrier frequency , and as you know the ASK , is similar to an AM modulation with this difference that the message signal isn't analog . it is a coded signal or a pulse chain . so , if you selected FC+FM at your transmitter , this oscillator will do this :
Your received signal*oscillator frequency and it will take difference of them , that will consequence Fm ( your message signal , which is an square wave ( approx) , and this signal will go through c2 (c2 is coupling capacitor ) and Q2 which biased at automatic bias , will amplify it ( at CE arrangement ) and at the another pin of c5 you'll have a pulse train , and c10 is just a filter to eliminate the eventual noises ( HF noises ) and at las you have a digital to analog converter that will give you an analog signal instead of your digital signal .
I hope you got it .
Best Wishes
Goldsmith