Space Varmint
New Member
If you get feedback in that way, then it's because your design is completely useless - it's absolutely impossible in anything like a correct design.
Oh you loved saying that. Actually this design is patent worthy I do believe. The whole receiver has 12 transistors and the LM386 chip. Really it is only 8 transistor stages in the radio section. Two of the transistors are for the pair in a differential amplifier and a Darlington pair. The two other transistor are for the AGC which works. No Op Amp. I know it works because I have a pot in it and if adjusted wrong you can hear the signal shut off. It is driven from the output of the IF and is IF AGC meaning it shuts it's IF off. So it is single conversion and uses a 455KHz ceramic filter for selectivity. Performance. Performance is great. Very clean for being all in one small box. This is why I have to keep the IF level down so that I don't get high frequency parasitic oscillations. What is unique is that I can make a small adjustment and pick up SSB & CW with no beat frequency oscillator. I could also do it by adding a switch to drop out the IF section and run the output of the post mixer amp straight into the audio. So think about it. Really it is only 8 transistor stages and 2 transistors for the AGC. 8 transistors into an LM386 chip for short-wave reception. I can pick up ham operators meaning allot transmit only 50 watts or so. Also it is not susceptible to 50 ohms input and a long wire antenna gives a good match. The only thing it needs is a little more audio. It will drive a speaker but really need headphones for true operation. Still it is all in one box with no shielded sections. That is why it was necessary to DELIBERATELY suppress the IF level. So when it encounters any sort of odd oscillations, it will automatically turn the gain down for normal reception.