[Elecraft] K3S ELF 10KHz

[Walter Underwood]

But “audio” could be shorthand for “audio frequencies” instead of “radio frequencies”. 10 kHz is a reasonable frequency for AF. I’m quite sure that my audio amplifiers do not amplify with compression waves.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Mar 23, 2017, at 3:56 PM, Jim Brown <jim at audiosystemsgroup.com> wrote:
> 
> Right. What is being transmitted is an electromagnetic field, NOT a sound field. Sound is AIR (or water) vibrating. Sound waves travel a bit faster than a foot per msec. Sonar uses sound. The system Mike is talking about is radio.
> 
> Radio is an electromagnetic field, which the simultaneous existence of an electric field and a magnetic field at right angles to each other, and they move through space at the speed of light. We can't hear radio waves, but we could hear high frequency sound waves if the radio waves were somehow detected (the trusty non-linear junction) and caused something to vibrate (or even to arc).
> 
> 73, Jim K9YC
> 
> On Thu,3/23/2017 3:03 PM, Mike Morrow wrote:
>> I didn't understand the reference to audio either.
>> 
>> When I on the crew of a US ballistic missile submarine more than 40 years ago, our main communications receivers were AN/BRR-3 units whose full frequency range was only 14 to 30 kHz.  These received signals from coastal stations operating at megawatt output levels, but there was no one near such a station with his ear drums damaged by or even sensitive to the station's continuous output.:-)
>> 
>> Anyone can listen to such signals as they exist today.
> 
> 
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