Post subject: ELF Development Kit Posted: Mon Feb 26,
2007 10:18 pm
Joined: Mon Feb 12, 2007
I am trying to learn the design and functionality
of extremely low frequency EM communication system. Is there any
development kit I can use to test the functionally of extremely
low frequency radio devices, where I can make both the devices talk
to each other. The reason I need to develop a device at extremely
low frequency (1 to 30 Hz) is because the medium of propagation
has an extremely high dielectric constant.
Post subject: ELFPosted: Tue Feb 27, 2007 12:16 am
Joined: Wed Feb 22, 2006 3:51 pm
The US Navy uses ELF to communicate with submarines.
The antenna takes up hundreds of square miles in either Michigan
or Wisconsin (I don't remember which right now), and is still appallingly
inefficient by HF standards. That means it runs high power.
So I don't think you'll find a "development kit" with an antenna
- a very critical piece! And the electric bill alone on high power...
(Water has a dielectric constant of about 80 - but dissolved
salt makes it very lossy indeed...)
Post subject: Posted: Tue Feb 27, 2007 12:41 am
Joined: Mon Feb 12, 2007 11:38 am
What EM system do you recommend I use to communicate through
1 meter of salt water. A system for which I can procure a development
Post subject: ELFPosted:
Wed Feb 28, 2007 3:35 am
Feb 22, 2006 3:51 pm
In a previous part
of my career, I worked as an applications engineer for a semiconductor
company. One thing I learned is that it costs a significant amount
of money to design, fab, assemble, and document a "Development Kit".
That means that companies only create development kits when
they see the possibility of the necessary minimum volume of sales
for the profit to more than cover the cost of a development kit.
Almost no one uses ELF frequencies that you mention.
That's why companies hire design engineers - people who can go from
ideas to implementations, because they know how to do it. They don't
have to have a canned kit.
Universities charge lots of money
for tuition for an engineering/science degree, and any degree take
lots of time - and people sign up anyway!
no one pays you very well just to solve already-solved problems.
If you want to "do it yourself", MIT offers their "Open CourseWare"