On Wed, 05 Nov 2014 13:11:31 -0500, rickman wrote:
On 11/5/2014 12:11 AM, Jeff Liebermann wrote:
On Tue, 04 Nov 2014 22:41:56 -0500, rickman wrote:
I guess this group is just done for.
Not so fast. The two postings on your 60KHz loop question by Wim
(PA3DJS) were well worth reading and certainly informative. I had no
idea how to calculate the H field until he provided an example. Don't
throw out the few good answers just because you dislike having to wade
through a mountain of garbage.
"At the bottom of every dumpster is a gem. It's only a question of
how much garbage you're willing to sift through trying to find it".
(Me about 1995).
You come up with some gems now and then, like this one, lol.
Thanks. I pickup such things on the well beaten path to
enlightenment. I threw the following together last night to deal with
a case of over-planning:
"Those that only live in the past are never disappointed by
the future because they make no plans. Those that live only
for the promises of the future tend to forget the lessons of
the past, and soon repeat them. Those that live only in the
present have both problems."
It looks like wisdom but it's really just a philosophy formula. take
two diametrically opposed observations and follow them with a self
contradictory conclusion. Once you know the trick, it's easy.
Now, if I could only fix my crappy arithmetic.
No, I'm
not willing to wade through a mountain of crap to find one or two good
posts.
Well, that's fine. I tolerate considerable abuse before giving up.
Many years ago, I was working as a 2way radio tech. My boss was a
compulsive liar and somewhat of a crook. Most of what he told me had
to be double checked before acting on it. However, I tolerated it
because the few gems at the bottom of this dumpster were well worth my
paying attention. It was low efficiency operation, but I was willing
to pay the price.
But maybe I am a bit shell shocked. I post on the s.e.d group
and there are a fair number of true a-holes who would rather insult you
than to answer one legitimate question.
Again, don't pass judgment on the person if the information is
worthwhile. Phil Allison in s.e.d is a good example. With few
exceptions, his opinions and info are quite good and accurate. He can
often see what others have missed or have ignored. I value that, even
when it arrives mixed with personal abuse, denunciations, profanity,
and character assassinations.
In response to your comment on the 60 kHz thread, I have done some spice
simulation, mostly to estimate the Q of the antenna. I would be happy
to post some info if you ask about it there.
A new WWVB shielded magnetic loop is certainly on my agenda and I do
plan to ask questions. However, I'll probably do it on the Time-Nuts
mailing list, which has more RF people.
Incidentally, I don't believe using a high impedance loop and amp are
good ideas. While there are benefits, my experiences from the marine
radio biz convinced me that high voltage is an invitation to problems
from condensation, salt fog, and PCB leakage. In other words, it
works on the bench, but craps out in the field. I'll probably end up
with a large high Q loop, and a separate low-Z coupling loop (i.e. a
step down xformer).
ok, back to work...
--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060
http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558