On Mon, 10 Aug 2020 06:15:40 -0700 (PDT), Jeff Urban
<
jurb...@gmail.com> wrote:
>I guess I forgot the extra "N", sorry. i can't rememebr everything.
Cut-n-paste and you won't need to remember.
>You might want to get out of California,
I've thought about that, but not for the reasons you mention. My
latest problem is that the local water district wants to build a
125,000 gallon water tank in the middle of my neighborhood. They plan
to take a year building it, blocking access to the neighborhood during
working hours for most of this time. So, I take off my engineer hat,
put on my politician hat, and do battle with the real estate
speculators who want to make their unbuildable properties buildable by
providing municipal water.
Incidentally, there are many reasons that I'm retiring. The big one
is that the area around my office has become somewhat of a homeless
encampment. When I discovered that customers and friends were
reluctant to visit my office to pickup and drop off their machines, I
decided it was time to bail out. That was about years ago. A kidney
stone operation and Covid-19 delayed my departure until now.
>Just how big is your house ?
1200 sq-ft. After deducting walk ways, bathroom kitchen, pantry, wood
burner, closets, and other areas that can't be used for storage, I'm
left with about 500 sq-ft that can be used for storage. The office
was 800 sq-ft, most of which was "inventory". As you might suspect,
there's not enough room at the house (no garage), so about 1/4th of
the junk is in boxes piled up outside on various decks. The plan is
to move out first to save money on the rent, and then do triage on the
remaining junk, reducing it to a manageable pile before it starts
raining.
>I have seen pictures of your shop. With
>all that, give them notice now that you'll be out by April or so.
I've already given notice and should be out by the end of the month.
I'm about 90% done with the move, leaving only some furniture, piles
of papers, some parts, cables, cleaning supplies, etc.
<
http://www.11junk.com/jeffl/pics/For%20Sale%20or%20Free%202/>
>So you are largely an autodidact. [So am I, but it appears you got
>greater challenges to meet in life and thus went farther.
Yeah, something like that. Some people learn best from lectures.
Others do best by reading about from a book. I learn best when I get
my hands dirty. The best part of that is nobody will pay me to listen
to lectures or read books, but will pay nicely to get my hands dirty.
>"Instant" is the bane of the human race.
It's part of progress. Things are happening today faster and faster
than they did when I was in skool. 50 years ago, I was allowed only 2
weeks to work out a suitable initial design, followed by 3 months
before the first articles were scheduled to be shipped. At the time,
I thought this was a horribly fast pace. More recently, I've been
helping clean up projects that were designed over a weekend, modeled
in LTSpice in a week, PCB designed with KiCad in another week, package
designed in SolidWorks in parallel with the PCB, and ready for
shipping in 3 weeks, during which time the first boards were tested.
End to end, that was about 6 weeks, without ever building a prototype.
Going from 14 weeks to 6 weeks is very much "instant" to someone used
to a slower pace (like me). That bad news is that makes me obsolete
by today's standards.
>I have become quite the student of politics. Never was before but
>we are in very interesting times and November is a crossroads. I do
>not watch the news, I have sources that are better than their
>sources sources. Some info I get before AP. Some.
So, what does knowing what happens in the news do for you? Will it
make money for you, perhaps in investments? Do you use it to predict
spending trends? When I look at politics on any level from global
politics to office politics, I always ask a simple question. What
problem are they trying to solve? If you can answer that simple
question, the rest of the picture becomes much clearer.
>I doubt I could ANSWER much. I understand the theory of operation,
>you take and retune certain antenna elements to produce a directional
>pattern due to the phase shift. From what I have read they can get
>within ten feet of you without GPS. The system is designed to
>conserve power, both theirs and yours. I can only imagine the
>software that runs that shit.
Mostly wrong.
1. You do not understand the theory of operation. When you are able
to discuss tradeoffs between occupied bandwidth, BER, SNR, OFDM, MIMO,
LTE, various modulation schemes, channel loading, interference,
fading, propagation, compression, MOS, error correction, etc, I'll
believe you understand the theory of operation. Knowing how a phased
antenna array works is like saying you understand how a stereo
receiver works because you understand how a capacitor functions.
There's much more to the puzzle than knowing about one small piece.
2. 10ft (3m) accuracy is possible, but not by direction finding.
Direction finding by any method is subject to difficulties due to
interference, multipath reflections, and reference accuracy. The way
most of these and other problems are minimized is to produce a large
number of lines of position on a map while moving. Some of the lines
point to false reflections. Others are from interference. Eventually,
you get enough lines that they start to intersect at one point on the
map. The transmitter is located somewhere within the blob of lines,
which will probably be much wider than 3m.
3. Huge amounts of effort have gone into power reduction at both the
handset and the tower. Read about APC (adaptive power control) and ET
(envelope tracking) on cell phones and base station transmitters.
>No, in that field I have no reputation to ruin for one. And I have
>"Stand corrected" and retracted when proven wrong. I don't mind
>people tearing me up, I learn more that way.
I mind very much being told that I'm wrong. I used to sulk for days
after getting caught making a stupid mistake. Like falling off a
horse, I get back on and try to ride again. It took me literally
years to get used to the idea that it was acceptable to screw up.
Gotta run now or I'll be late...