Jun JH8SST made this nice video about his version of Pete Juliano's Simpleceiver. I like the approach of putting the stages on separate boards, but perhaps Jun could have made things easier by using Manhattan-style construction on those boards. And of course I like the breadboard-style aluminum sheet. FB Jun.
I've built a simpleceiver, which is a modified version. My first main board didn't work because of several problems, and that's why I decided to divide the board into several separated PCB's with some circuit modifications.
RF and Mixer stages are original, but I employed an 8pole 9MHz ladder Xtal filter. The J310 X 2 is used in IF amplifiers, but load resonant circuit is modified to use a type 10K coil form and a ceramic capacitor.
J310 product detector is original and built on a tiny PCB, as shown in attached photo and YouTube Video.
This modified Simpleceiver has high sensitivity and more than enough gain. I needed to reduce RF/IF gain to eliminate product detector distortion caused by stronger signals.
This simpleceiver works really nicely.
I'm going to re-modify it to make it as original as possible.
The block diagram is: J310X2 RF－DBM－9MHz 8 pole X'tal Filter－J310X2 IF－J310X2 IF－J310 product detector－AF μA741－AF LM380 with NFB.
I'm going to re-modify it as: J310X2 RF－DBM－J310X2 IF－12MHz 4 pole X'tal Filter－J310X2 IF－J310 product detector－AF μA741－AF LM380 with NFB.
I'm also going to add an AGC system using a modified W1FB AGC circuit.