On Wed, 29 Jun 2016 07:59:51 -0700, Jeff Liebermann
wrote:

I have been looking into design of receivers in the LF to ELF frequency
ranges. Is this part of "amateur" radio?

Mostly yet. However, some bands do not require a license and operate
under FCC Part 15:

I forgot to mumble something about which bands require an amateur
license and which do not under Part 15. The lowest frequency band
that requires a ham license is 160 meters (1.8 to 2.0 MHz).
http://www.arrl.org/frequency-allocations
The various bands below that fall under Part 15.xxx as intentional
radiator rules and do NOT require a license. However, 135.7 to
137.8Khz (2200 meters) is designated as an amateur radio band by the
ITU. However, since it more easily falls under unlicensed Part 15
rules, the FCC does not require an amateur license to operate there.
These bands are not world wide and vary by national jurisdiction:
https://en.wikipedia.org/wiki/LowFER
https://en.wikipedia.org/wiki/2200-meter_band

Most LOWFER experimenters have ham radio call signs and use them on
the LOWFER frequencies. There is no requirement to identify with an
amateur call sign, but it is convenient.


--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558