Digest for sci.electronics.repair@googlegroups.com - 14 updates in 5 topics

Foxs Mercantile <jdangus@att.net>: Nov 18 11:26AM -0600

On 11/18/2017 6:47 AM, John-Del wrote:
> and replace the 4 wall switches that control the 10
> outdoor fixtures to an automated type and have a
> single light sensor control them at one shot.
 
Use one of these to control a 120 VAC relay with
contacts heavy enough to handle your entire lighting
load.
 
<https://www.1000bulbs.com/product/3334/ELEC-K4121C.html?gclid=Cj0KCQiA0b_QBRCeARIsAFntQ9qPrGVVT9TidkNMuzr-ZQQBmzU7KFt1eIdLSzl8XnwHg3Fsa6Am2m8aAnk_EALw_wcB>
 
 
 
--
Jeff-1.0
wa6fwi
http://www.foxsmercantile.com
tabbypurr@gmail.com: Nov 18 09:44AM -0800

> On Saturday, November 18, 2017 at 8:56:43 AM UTC-5, tabby wrote:
 
> > And outdoor lighting enables burglars to be seen.
 
> Do you have light(s) in your back yard?
 
yes
 
> Burglars seldom go in the front door.
 
they've tried all the doors & some windows here. None seem keen to return though.
 
 
> Yep. Those few burglars that still operate at night around here tend to wear bright uniforms with reflective stripes and drive panel vans with magnetic signs of one sort of emergency response group or another.
 
> The best deterrent of all is a nosy neighbor - and our neighborhood is full of those. Next best is a loud dog. Similarly, including two of our own.
 
there are various deterrents.
 
 
NT
"(PeteCresswell)" <x@y.Invalid>: Nov 18 04:32PM -0500

Per John-Del:
>Does anyone know of a reliable system or pieces
 
I used to have 250w floods arranged to illuminate the entire perimeter
of the house and controlled by x10 - with as "Panic Switch" x10 remote
in the bedroom that turned them all on at once.
 
But the x10's did not age well, my paranoia subsided, and now we have
nothing security-wise.
 
For my backyard critter cams, I have been using 500w
motion-triggered halogen lights like this:
http://tinyurl.com/y92fxcfz
 
They *really* light things up - giving daylight color and motion
conditions to the cams.
 
If I were doing my home, I would put one of those (or maybe one of the
next grade up (http://tinyurl.com/y92fxcfz) at each potential entry
point.
 
I have no expert knowledge, but intuitively it seems to me like
motion-detected with *lots* of light would be superior because:
 
- They let you know something is up by the intense amount of
light suddenly shed outside
 
- It has to be unsettling to a prowler to be spotlighted while
the inside of the house is dark (giving advantage to the person
inside).
 
The weak point I have found in motion sensing is the sensors: sometimes
they get weird in cold weather and trigger spontaneously.
--
Pete Cresswell
"pfjw@aol.com" <pfjw@aol.com>: Nov 18 02:45PM -0800

Our neighbor has motion sensors. Start with the premise that we are in the immediate ring-suburb to Philadelphia - I sometimes walk the dogs and cross over the border.
 
We have: Deer, wild turkeys, great-blue heron in the summer, raccoons, foxes, and more. Each and every one of which will trip a motion sensor, as the animals are fearless and they are more-or-less guided right by them.
 
And, as stated, cold weather does weird them out such that windy nights have them on as often as off.
 
Anything large enough to be of concern will get the dogs going even before any lights go on. People, other dogs, and deer - that is it. Timers if you must light up the world. Please.
 
Peter Wieck
Melrose Park, PA
tabbypurr@gmail.com: Nov 18 04:21PM -0800


> Anything large enough to be of concern will get the dogs going even before any lights go on. People, other dogs, and deer - that is it. Timers if you must light up the world. Please.
 
> Peter Wieck
> Melrose Park, PA
 
PIRs certainly aren't perfect, and many just aren't set right in practice, but they're a lot better than leaving the light on all night long.
 
 
NT
bruce2bowser@gmail.com: Nov 18 10:29PM -0800


> We have: Deer, wild turkeys, great-blue heron in the summer, raccoons, foxes, and more. Each and every one of which will trip a motion sensor, as the animals are fearless and they are more-or-less guided right by them.
 
> And, as stated, cold weather does weird them out such that windy nights have them on as often as off.
 
> Anything large enough to be of concern will get the dogs going even before any lights go on. People, other dogs, and deer - that is it.
 
I remember seeing stats saying that night-time prowlers usually know the victims already. Explain that!
"pfjw@aol.com" <pfjw@aol.com>: Nov 19 04:29AM -0800

A successful burglar is not stupid. Most house robberies are committed during daylight hours when the residents are at work or school. Most are well-scoped. Have you had poll-takers, surveyors, solicitors for charity and various causes come to your door? Our township requires a license and picture-tag on a lanyard for such activities for that reason. Not that many comply.
 
Night-time burglaries tend to be equally well scoped. Such as porch-light on 24/7, or inside lights that stay on all night. Whatever is not what you do routinely will be spotted by a pro - and that is a signal for them. And, even timed lights that do not vary are a signal.
 
At the same time, a pro *will not* take on a challenge. They will move on to the next victim. It is similar to running from a bear. I do not have to outrun the bear, just the person with me. I do not have to have an impregnable house with super locks. Just be a bit more difficult than the guy next door.
 
Peter Wieck
Melrose Park, PA
tabbypurr@gmail.com: Nov 19 08:22AM -0800


> A successful burglar is not stupid.
 
then what are they doing burgling?
 
 
> At the same time, a pro *will not* take on a challenge. They will move on to the next victim. It is similar to running from a bear. I do not have to outrun the bear, just the person with me. I do not have to have an impregnable house with super locks. Just be a bit more difficult than the guy next door.
 
> Peter Wieck
> Melrose Park, PA
 
Burglars come in all types. Any attempt to defend against just one type has a habit of defending against just one type.
 
 
NT
Jeff Liebermann <jeffl@cruzio.com>: Nov 18 09:26PM -0800

On Fri, 17 Nov 2017 09:58:09 +0000 (UTC), harry newton
 
>PS: The rains are coming.
 
Yeah right. A few days ago, it was suppose to rain Sunday and Monday.
Yesterday, the prediction was Monday only. Today, it's no rain.
See the "NOAA Weather Prediction Center"
<http://www.wpc.ncep.noaa.gov>
Mouse over the "Day 1, Day 2, Day 3" just above the weather map.
Notice how the southern boundary of the predicted rainfall stops just
south of San Francisco Bay.
 
Must be a conspiracy. I want my rain.
 
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
nmassello@yahoo.com (Neill Massello): Nov 18 10:56PM -0700


> Must be a conspiracy. I want my rain.
 
Blame La Niña. She will make for a warm dry winter this year across the
southern half of the lower 48.
Jeff Liebermann <jeffl@cruzio.com>: Nov 19 08:17AM -0800

On Sat, 18 Nov 2017 22:56:12 -0700, nmassello@yahoo.com (Neill
Massello) wrote:
 
 
>> Must be a conspiracy. I want my rain.
 
>Blame La Niña. She will make for a warm dry winter this year across the
>southern half of the lower 48.
 
"La Niña Conditions Have Arrived and Are Likely to Remain Through
Early 2018, NOAA Says"
<https://weather.com/news/climate/news/2017-11-09-la-nina-noaa-updates>
<http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso_advisory/ensodisc.shtml>
Of course, the government (NOAA) is always right.
Grumble...
 
 
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
M Philbrook <jamie_ka1lpa@charter.net>: Nov 19 11:00AM -0500

as it states, It would be nice to get a schematic for this PID
board or at least the OEM manual..
 
We have a machine that is full of these boards driving DC drives etc.
 
They are old tech but I would like to get a better understanding of the
controls on it.
 
It has Tach following adjust, Integrator, Int Rate, again, offset
etc...

But it also has some dip switches and other pots that currently seem to
be set to their zero place..
 
I can do a reverse engineer of one of them using a CAD app if I have to
but a ready made manual would be nice.
 
Fincor 105456401 or could be 10545640-1 and 1900-77 etc.
Jeff Liebermann <jeffl@cruzio.com>: Nov 18 10:26AM -0800

On Sat, 18 Nov 2017 06:21:17 -0800 (PST), bruce2bowser@gmail.com
wrote:
 
>>beamwidth.
 
>That is a good question: can ground-penetrating-emitted waves be
>bent or corrupted easier than waves within a laser beam?
 
How easier RF is refracted (bent) or reflected varies with frequency,
material, density, magnetic field, etc. In other words, just about
everything you can put between the transmitter and receiver. For GPR,
the frequency is important as different frequencies penetrate
different materials in varying degrees. This chart sorta helps:
<http://www.geophysical.com/antennas.htm>
If you wanted to go through concrete, I would guess(tm) that 400 Mhz
would be about right. I don't have any experience with GPR, so I
don't know if this is correct.
 
However, we're not going through anything. The laser is being
reflected off of the surface, probably through a Low-E reduced heat
loss coating, and back to a receiver. The ideal surface would be a
mirror. The worst surface would be an RF transparent glass or plastic
window.
 
The exact opposite is true for the microphone RF cavity and antenna
contrivance. The RF has to penetrate the building or window, reflect
off the side of the cavity, go back through the building or window,
and somehow end up at the receiver. In this case, the ideal building
material would be totally transparent to RF. That's not going to
happen, so the best they could do was use lower frequencies, such as
300 Mhz, which sorta goes through building materials. However, the
frequency was probably selected because the cavity inside the seal had
to be big to pickup voice, and the optimum physical size that would
fit worked out to about 300 MHz.
 
>Anywho, with a hard-wire connection (on the other hand) like with
>high-speed internet, isn't interference more easily detected (and
>less possible to apply)?
 
Why would I want to detect interference?
 
>Here, electrodes would have to be applied to the window or some
>other part of both the transmitting and receiving locations.
 
I suspect the embassy staff might have noticed the electrodes and
wires. Stealth means a listening device cannot be easily detected.
 
>skull to determine brain signals, like if they wanted to merely
>create the sensation of smoking, drinking, doing drugs, etc..)
>without it actually being done.
 
You just walked off the deep end. I have no idea what you're
suggesting or asking. Please bug someone else.
 
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
Foxs Mercantile <jdangus@att.net>: Nov 18 11:32AM -0600

On 11/18/2017 1:47 AM, Hank wrote:
>>> need to be told how to restore a run-of-the mill AA5?
>> I dont recall saying that. Maybe you need a reading comprehension
>> course.
 
I tried early on helping this individual.
It soon became obvious he doesn't want help.
He just wants to bitch.
 
--
Jeff-1.0
wa6fwi
http://www.foxsmercantile.com
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