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A project log for Yet Another MW Radio - The Audion

Another super simple medium wave radio. This time a Franklin Audion (synchronous detector).

agp.cooperagp.cooper 01/07/2017 at 14:450 Comments

Test Fire

Using a 4 foot wire aerial the radio worked but not very loud. Regeneration was smooth and sound quality was good. The circuit Q is pretty poor and regeneration only improves the Q to a limited extent. I was not that impressed! Here it is:

Hooked up a 14 m aerial (no earth) and the volume was quite loud. Clearly, the "detector" is not that sensitive (need a strong signal to perform). There is a design which has AGC, now I know why:

I was thinking it may be better to take the audio off the emitters rather than from the coil tap. I found an example at http://www.vk2zay.net/article/128:

Worth a try.


AlanX

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