This is a direct conversion receiver using a Polyakov detector (the two anti-parallel diodes)... The third harmonic of the 8.362 MHz crystal is exactly half of the frequency of interest and mixes with the incoming rf to give a baseband output to the crystal earpiece... Google "polyakov direct conversion receiver" to learn more... 8.362
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what is the function of the two diodes back to back?
This is a direct conversion receiver using a Polyakov detector (the two anti-parallel diodes)... The third harmonic of the 8.362 MHz crystal is exactly half of the frequency of interest and mixes with the incoming rf to give a baseband output to the crystal earpiece... Google "polyakov direct conversion receiver" to learn more...
8.362
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