# [CM] fm again

**edgar-rft@web.de
**
edgar-rft at web.de

*Wed, 21 Nov 2007 06:34:34 +0100*

Hi all,
>* For an FM transmitter what it is the minimum length of the antenna for
*>* broadcasting at a frequency around 100MHz. ?
*
There is no minimum length for electromagnetical radiation. AFAIK it's
1/lightspeed but that's atomic size so the 'minimum length' is probably
1 atom or just simply the smallest piece of metal you can imagine.
The 'minimum reasonable length' is considered 'lambda/4' where:
lambda = velocity / frequency
lambda = electromagnetical wave length (not LISP)
velocity = light speed
frequency = 100MHz
More broadcast information see:
http://www.epanorama.net/links/radio.html
regards,
- edgar
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