Re: What's difficult in DIY audio?

"Peter Wieck" <pfjw@xxxxxxx> wrote in message
news:1180491734.775980.124750@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
On May 29, 4:28 pm, robert casey <wa2...@xxxxxxxxxxxxx>
wrote:
For some real fun, build a high performance FM tube
tuner from scratch. Getting 100MHz circuits to behave
is another ballgame.

There is a crystal FM tuner out there. I wonder if it is
powerful enough to drive a multiplex adaptor...

http://solomonsmusic.net/FM_CrystalRadio.html

I have to try that some time.

It needs a really strong signal to work at all.

It produces audio based on slope detection, which fails to exploit FM's
resistance to interference. Linearity is often poor.

To recover audio efficiently, the slope has to be high, requiring a high-Q
tuned circuit, but putting any kind of load on the detector drops the Q.


.

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