Posted by
Bill Frantz on
Jul 13, 2012; 3:21am
URL: http://elecraft.85.s1.nabble.com/KX3-Receive-Performance-Below-1500-kHz-tp7558831p7559046.html
As one who has been exploring caves for the last 40+ years, my
principle interest in the 630M band is its ability to
communicate thru solid rock. There is a long history of cave
radios operating on medium frequencies under part 15, most of
which use antennas consisting of a coil of wire. (One of the
rules of thumb for cave radios is that the antenna and the
battery should weigh about the same.)
Cave radios used for communication are quite different from
those used to locate the surface point directly over an
under-ground point, and estimate its depth.
If you are interested in cave radios, most of the work in the US
has been documented in Speleonics, published by the
Communication and Electronics Section of the National
Speleological Society. All issues are available for free
download from
<
http://www.caves.org/section/commelect/drupal/speleonics>. The
most recent issue has an index of all issues and is available
from <
http://www.caves.org/section/commelect/splncs/splncs28.pdf>.
There is also an active British group, the Cave Radio and
Electronics Group <
http://bcra.org.uk/creg/>. They accept Paypal
for their publications.
Cheers - Bill, AE6JV
On 7/10/12 at 1:13,
[hidden email] (Edward R. Cole) wrote:
>I think the KX3 still has promise of being a good 630m radio
>(with a little help from its friends). 630m will likely be
>slow to start (just like the 60m band), but in time there will
>be a decent population there. Right now it is still an
>experimental band.
-----------------------------------------------------------------------
Bill Frantz | gets() remains as a monument | Periwinkle
(408)356-8506 | to C's continuing support of | 16345
Englewood Ave
www.pwpconsult.com | buffer overruns. | Los Gatos,
CA 95032
______________________________________________________________
Elecraft mailing list
Home:
http://mailman.qth.net/mailman/listinfo/elecraftHelp:
http://mailman.qth.net/mmfaq.htmPost: mailto:
[hidden email]
This list hosted by:
http://www.qsl.netPlease help support this email list:
http://www.qsl.net/donate.html