Digest for sci.electronics.repair@googlegroups.com - 25 updates in 6 topics

got2lovecheesecake@gmail.com: Nov 14 06:29PM -0800

> Solution Manual and Test bank Absolute Java (6th Ed., Walter Savitch)
> Solution Manual The Art and Science of Java (Eric Roberts)
> Solution Manual Buildi...
 
please send me electronic principle malvino 7th edition please
harry newton <harry@is.invalid>: Nov 14 08:19PM

If we wanted to automatically reboot our radios once a week, should we do
it with a GitHub script on the radio or do you know of a better way?
<https://github.com/stevejenkins/unifi-linux-utils>
 
We're on a classic small WISP outfit (2-man operation, maybe 100 homes) in
the Santa Cruz mountains, where, whenever we call for technical support,
they *always* tell us to reboot the radio - where - shockingly - often -
the performance goes up (don't ask me why or how - it just does).
 
So let's not argue the fact that our WISP Internet speeds are better (for
whatever reason) after we reboot our rooftop radios (which most of you
would call a "modem" but we call them transceivers, or just radios, for
short).
 
Let's just ask the question.
 
If we wanted to automatically reboot our radios once a week, can we do it
with a GitHub script on the radio or do you know of a better way?
 
For example, how does this GitHub script look to you Linux coders like
Marek Novotny and William Unruh?
<https://github.com/stevejenkins/unifi-linux-utils>
"pfjw@aol.com" <pfjw@aol.com>: Nov 14 01:12PM -0800

I am of the simple-minded, low-tech approach school. Does "rebooting" consist of some sort of power-down-power-up?
 
If so, get a timer that shuts off power at some specific time each week for some specified period of time.
 
https://images.homedepot-static.com/productImages/5b276b93-95b8-47ad-8ea2-348cec54411c/svn/gray-intermatic-timers-et8015c-64_1000.jpg
 
This one will do nicely. 30A should be able to handle the load in any case. Set it for 3:00 am of a Tuesday night and see how it goes. Unless some of your customers are running SETI, they should never know.
 
Peter Wieck
Melrose Park, PA
danny burstein <dannyb@panix.com>: Nov 14 09:31PM


>If we wanted to automatically reboot our radios once a week, should we do
>it with a GitHub script on the radio or do you know of a better way?
><https://github.com/stevejenkins/unifi-linux-utils>
 
If you're just looking for a periodic reboot then the
simplest way would be a 7 day timer with a poewr-down
at (say) 03:45 Thursday morning. Alternaitvely, you
could shut thing down Mon, Wed, and Sat.
 
If you're looking for "on demand", then there are
numerous options available using cell phones.
 
--
_____________________________________________________
Knowledge may be power, but communications is the key
dannyb@panix.com
[to foil spammers, my address has been double rot-13 encoded]
Jasen Betts <jasen@xnet.co.nz>: Nov 15 01:38AM

> If we wanted to automatically reboot our radios once a week, should we do
> it with a GitHub script on the radio or do you know of a better way?
><https://github.com/stevejenkins/unifi-linux-utils>
 
looks like it could work, if you've changed the admin passwords on your
radios you'll need to update the script. if not you probably should.
 
one reason why rebooting may help is if you skipped the firmware
release early this year, your radios may be being subverted by IOT
malware. (there was a more recent patch for wifi insecurity - that
should be applied too.
 
 
 
 
 
 
--
This email has not been checked by half-arsed antivirus software
bitrex <bitrex@de.lete.earthlink.net>: Nov 14 05:00PM -0500

On 11/14/2017 08:37 AM, Foxs Mercantile wrote:
 
> As effective as barking at the moon.
> Use a real product designed for that.
> Kroil
 
It worked just fine with a little patience.
bitrex <bitrex@de.lete.earthlink.net>: Nov 14 05:02PM -0500

On 11/14/2017 08:39 AM, Foxs Mercantile wrote:
>> would get stuck in plastic from rusting.
 
> Another thing you apparently can't understand.
 
> If the screws rust, the rust embeds itself in the plastic.
 
This guy is grumpy/sassy. I'm going to call him "Grumpy McSassypants"
John-Del <ohger1s@gmail.com>: Nov 14 03:12PM -0800

On Tuesday, November 14, 2017 at 8:39:01 AM UTC-5, Foxs Mercantile wrote:
> Jeff-1.0
> wa6fwi
> http://www.foxsmercantile.com
 
 
 
 
Rusty metal also expands somewhat. As The Beav might say, it's "swell"...
Clifford Heath <no.spam@please.net>: Nov 15 12:43PM +1100

On 15/11/17 10:12, John-Del wrote:
>> wa6fwi
>> http://www.foxsmercantile.com
 
> Rusty metal also expands somewhat. As The Beav might say, it's "swell"...
 
Rust takes *seven times* the volume of the steel it came from.
That's why concrete cancer cracks the concrete and gets worse
so quickly.
"Ian Field" <gangprobing.alien1@virginmedia.com>: Nov 14 07:22PM

Just curious about the failure mode - the cells really weren't worked that
hard.
 
Thanks.
mike <ham789@netzero.net>: Nov 14 01:32PM -0800

On 11/14/2017 11:22 AM, Ian Field wrote:
> Just curious about the failure mode - the cells really weren't worked
> that hard.
 
> Thanks.
You're gonna have to be a LOT more descriptive about the 'pack'.
passive/active/protected?
What did it power?
"Ian Field" <gangprobing.alien1@virginmedia.com>: Nov 14 09:44PM

"mike" <ham789@netzero.net> wrote in message
news:oufnf8$oh8$1@dont-email.me...
> You're gonna have to be a LOT more descriptive about the 'pack'.
> passive/active/protected?
> What did it power?
 
Just a bare 2P 18650 pack powering an e-cig with a 1 Ohm coil.
 
The only electronics is a power MOSFET where there used to be a microswitch
for the fire button.
 
Charging is controlled by a shunt regulator, there is a feed SB diode so the
shunt failing short can't harm the battery.
mike <ham789@netzero.net>: Nov 14 05:39PM -0800

On 11/14/2017 1:44 PM, Ian Field wrote:
> microswitch for the fire button.
 
> Charging is controlled by a shunt regulator, there is a feed SB diode so
> the shunt failing short can't harm the battery.
 
That seems to contradict the statement the the only electronics is the
MOSFET. I don't know what to make of that... And something has to
control the MOSFET
 
You're saying that the shunt regulator failing open can't harm the battery?
You're saying that the SB diode, guessing that it's a series diode
from regulator to cells, can't fail short and harm the battery?
 
The 18650 cells they put in cordless drills can do 30 amps each.
The cells you get on ebay for cheap may not like 4 amps at all.
 
 
Assuming this is a commercial battery pack and not
something you cobbled together.
Assuming that the cells are bare unprotected cells.
Assuming that you're measuring the cells directly at the cells and they
are open.
 
There's not much that can go wrong.
There's typically a pressure switch inside the cell that opens
if the pressure gets too high or the positive terminal gets too hot.
 
Some people believe that you can take random cells, solder wires
on 'em and you're good to go. That dramatically increases the
failure rate, assuming you don't set them on fire while soldering.
 
I'm not a smoker, but it's hard to imagine a successful e-cig
that's as big as a pair of 18650's.
Is there more to the story?
Jeff Liebermann <jeffl@cruzio.com>: Nov 14 09:05AM -0800

On Tue, 14 Nov 2017 04:07:54 -0800 (PST), "pfjw@aol.com"
 
>Ladies and Gentlemen and Children of all ages:
 
Do I need to repeat myself? There are few ladies, no gentlemen of
leisure, and no children in the audience. Please address the audience
in a proper manner.
 
>The call of the ringmaster at the beginning of any Ringling
>Brothers, Barnum and Bailey Circus. Now gone from the American scene.
 
May 21 was their last show. Yeah, I miss the animal cruelty acts.
 
>if nothing else, there are aspects of the circus displayed herein.
 
Such as? A circus is expected to be entertaining, which this
discussion seems to lack.
 
>You don't get out much, do you?
 
Quite the contrary. My customers are complaining that I'm never in my
office. If anything, I'm out most of the time.
 
Now, back to something resembling electronics... what makes you claim
that connecting 2 resistors in parallel somehow produces negative
resistance?
 
--
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
"pfjw@aol.com" <pfjw@aol.com>: Nov 14 09:51AM -0800

Jeff:
 
You need a humor transplant. Either that, or your sense of humor is more seared than arid.
 
Two resistors in parallel deliver resistance less than either. Last I looked, resistors 'produce' little - other than perhaps a bit of inductance if a wire-wound device. Given the level of education with the OP, that is as close to negative resistance as he will be likely to achieve or understand.
 
Animal Cruelty Acts. Yes, certainly. The circus, along with dwarf-throwing, bear baiting, dove-shoots, buffalo hunts and much, much more represent cruel times in American History. However, today that cruelty has been largely been confined to human-on-human, and most of us are dead quiet about all that. Cute, fuzzy little animals, noble lions, tigers, elephants and whales are very safe causes with few objecting to them - but for certain "japs" and other "slopes", or little brown "gooks" somewhere or other. But not our neighbors, friends and allies. Gotta look at them with half-closed eyes (Duterte, Putin, Li, Salman), but that's all right. As long as the goods, oil, cheap wood and other 'stuff' keeps coming.
 
But we all sit back and cry crocodile tears about very real and very preventable human tragedies and do nothing or much worse. All for the sake of comfort. As a country and a culture, we are going through troubled times. We are about to lose, if it is not lost already, our primacy as a moral compass for the world, and we are about to cede that position to China of all possibilities. Does that not scare the living shit out of you?
 
Peter Wieck
Melrose Park, PA
oldschool@tubes.com: Nov 14 12:59PM -0600

On Sun, 12 Nov 2017 05:56:47 -0500, Michael A Terrell
 
> Kill file the pathetic troll. He posts his bullshit messages on many
>newsgroups.
 
While negative resistance does not exist, you have proven that it is
possible to have a negative sense of humor. That's negative ten on the
humor scale, or ten points below ZERO sense of humor!
tschw10117@gmail.com: Nov 14 11:13AM -0800

Negative resistance does exist.
 
Negative resistors do not exist.
 
 
John-Del <ohger1s@gmail.com>: Nov 14 12:16PM -0800

>> The circus, along with dwarf-throwing.....
 
Peter, we're living in a more enlightened society these days, and while dwarf might be technically accurate, I believe the correct description is "vertically retarded".
 
Thank you...
 
 
 
>>>Does that not scare the living shit out of you?
 
> Peter Wieck
> Melrose Park, PA
 
 
Well, I've lived long enough for you to say "shit" on an NG. Bravo my friend, bravo...
 
Giving this more thought, do you think our friend Jeffrey A is having a negative influence on us?
"pfjw@aol.com" <pfjw@aol.com>: Nov 14 12:50PM -0800

I have met Jeff on his turf (Ranger, TX). Best described as a curmudgeon that does not suffer fools gladly - and one who has lived enough of life to have earned the privilege of writing what he means - and meaning what he writes. I was in Texas on business, I had a free evening. It was only 94 miles from where I was to Ranger. In Texas, that is errand distance.
 
Me using the S word was chosen for shock-value, true. We are well-and-truly in dire straits - and without intervention from more enlightened minds, the United States will be seriously degraded, more so than now, certainly. We are averaging over two serious incidents per month, now. And the perpetrators somehow feel entitled to commit them. Worse, their behavior is defended all-to-often. When the swamp overflows in the Nation's Capitol, all the slime in the hinterlands feels entitled to come out and play.
 
Peter Wieck
Melrose Park, PA
"pfjw@aol.com" <pfjw@aol.com>: Nov 14 12:56PM -0800

On Tuesday, November 14, 2017 at 3:16:55 PM UTC-5, John-Del wrote:
> On Tuesday, November 14, 2017 at 12:51:58 PM UTC-5, pf...@aol.com wrote:
> >> The circus, along with dwarf-throwing.....
 
> Peter, we're living in a more enlightened society these days, and while dwarf might be technically accurate, I believe the correct description is "vertically retarded".
 
Then there is the story of Atwater Kent putting a help-wanted ad in in the local papers in Philadelphia:
 
Wanted: Midgets as Coil Winders. Male and Female. Apply in person at Atwater Kent, 6240 Wissahickon Avenue, Philadelphia 44. No Dwarves need apply.
 
Peter Wieck
Melrose Park, PA
John-Del <ohger1s@gmail.com>: Nov 14 01:16PM -0800


> Wanted: Midgets as Coil Winders. Male and Female. Apply in person at Atwater Kent, 6240 Wissahickon Avenue, Philadelphia 44. No Dwarves need apply.
 
> Peter Wieck
> Melrose Park, PA
 
 
Touche
Foxs Mercantile <jdangus@att.net>: Nov 14 04:55PM -0600

On 11/14/2017 2:16 PM, John-Del wrote:
> Giving this more thought, do you think our friend
> Jeffrey A is having a negative influence on us?
 
Not hardly, in the words of George C Scott as the
Flim Flam Man, "You can't cheat an honest man, I'm
here to preach that gospel."
 
 
--
Jeff-1.0
wa6fwi
http://www.foxsmercantile.com
Foxs Mercantile <jdangus@att.net>: Nov 14 04:57PM -0600

> I have met Jeff on his turf (Ranger, TX). Best
> described as a curmudgeon that does not suffer
> fools gladly -
 
I am surrounded by them.
 
> and one who has lived enough of life to have
> earned the privilege of writing what he means
> - and meaning what he writes.
 
Thank you Peter.
 
 
 
--
Jeff-1.0
wa6fwi
http://www.foxsmercantile.com
Black Iccy <Daedelus@whereamIinvalid.com>: Nov 15 11:19AM +1100


>While negative resistance does not exist, you have proven that it is
>possible to have a negative sense of humor. That's negative ten on the
>humor scale, or ten points below ZERO sense of humor!
 
 
Oh sure.
Here is a reference to your own sparkling, incandescent wit.
Strangely, you never popped up to claim any ID impersonation.
None that I've ever seen. So strange, on Usenet, that people
judge you by the verbal clothing you wear isn't it?
 
https://preview.tinyurl.com/ydckgog2
http://scielectronics.blogspot.com.au/2017/09/digest-for-scielectronicsrepairgooglegr_11.html
tschw10117@gmail.com: Nov 14 08:51AM -0800


> Schadenfreude.
 
> Peter Wieck
> Melrose Park, PA
 
Well we have tried to educate.... that having failed, we may as well enjoy.
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