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ELF Development Kit- RF Cafe Forums
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em101
Post subject: ELF Development Kit Posted: Mon Feb 26, 2007
10:18 pm
Lieutenant
Joined: Mon Feb 12, 2007 11:38 am
Posts: 2
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.
Top
fred47
Post subject: ELFPosted: Tue Feb 27,
2007 12:16 am
General
Joined: Wed Feb 22, 2006 3:51
pm
Posts: 104
Hi!
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...)
-Fred
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em101
Post subject: Posted: Tue Feb 27, 2007 12:41 am
Lieutenant
Joined: Mon Feb 12, 2007 11:38 am
Posts: 2
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 kit!
Thanks
Top
fred47
Post subject: ELFPosted: Wed Feb 28,
2007 3:35 am
General
Joined: Wed Feb 22, 2006 3:51
pm
Posts: 104
Hi!
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!
That's because no one pays you very well just to solve already-solved
problems.
If you want to "do it yourself", MIT offers their "Open
CourseWare" free online.
Good Luck!
Fred
Posted 11/12/2012 |
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