On 6 Apr 2007 17:10:39 -0700, "Telstar Electronics"
wrote:

+++ 100Hz?????
+++ That is a subaudible frequency.
+++ How could anyone detect it without a scope?
+++
+++ james
+++
+++If you can't hear 100Hz... you need to get your ears checked Jim.
+++
+++www.telstar-electronics.com
+++
**********
Obvisously you lack the knowledge of what is the subtle difference
between audible and audio frequency. Also I did forget that CB radios
are not necessarily well designed radios. In a well designed radio,
any audio frequency below 300Hz is considered subaudible.

Why? Because the power density in the human voice below 300Hz is
negligible. Most well designed receivers for communications purposes
do not have audio response below 300 Hz. Also human hearing threshold
increases as the frequency decreases below 300Hz. That is the source
of the audio freq uency needs to have a larger PSL in order for it to
be heard. Sensitivity to audio frequency in Humans is not flat like
that of speakers and some sound systems. Instead SPL, Sound Pressure
Level, needs to increase as frequency decreases below 300Hz to gain
the recognition. For most Humans the power of a 20Hz signal needs to
be about 30dB higher than that of 100Hz.


james