Digest for sci.electronics.repair@googlegroups.com - 12 updates in 6 topics

Jeff Liebermann <jeffl@cruzio.com>: Aug 26 07:08AM -0700

On Tue, 25 Aug 2015 22:06:49 +0000 (UTC), ceg
>> It got misdirected from a disco gobo.
 
>BTW, why do so many people use HOME as the prefix to their
>SSID's?
 
They don't. The HOME-XXXX format, where XXXX might be the last 4
digits of the MAC address, is the default SSID for Comcast "gateway"
style wireless routers. I'm not sure when this started, but my
guess(tm) is about 2 years ago.
 
Anything is better than linksys, dlink, default, hpsetup, and default.
<https://wigle.net/stats#mainstats>
3.74% of about 210 million wireless networks use the default SSID. I
guess this is proof that most computer users have no imagination.
 
 
 
--
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
Mark Lloyd <not@mail.invalid>: Aug 26 10:25AM -0500

On 08/25/2015 05:06 PM, ceg wrote:
>> It got misdirected from a disco gobo.
 
> BTW, why do so many people use HOME as the prefix to their
> SSID's?
 
I have been in a nearby city, where there are a lot of college students.
I don't see "home" but I do often see ISP names or router brand names.
It looks like an attempt by sellers to provide unique SSIDs, and users
who don't change the defaults.
 
Where I live, I don't see prefixes like that, but I do see some
interesting names like "FBI Surveillance" and
"ThisIsNoyTheWiFiYou'reLookingFor".
 
 
--
Mark Lloyd
http://notstupid.us/
 
"HUMANISM: an exaltation of freedom, but one limited by our need to
exercise it as an integral part of nature and society." [John Ralston
Saul]
Mark Lloyd <not@mail.invalid>: Aug 26 10:29AM -0500

On 08/26/2015 09:08 AM, Jeff Liebermann wrote:
 
[snip]
 
> <https://wigle.net/stats#mainstats>
> 3.74% of about 210 million wireless networks use the default SSID. I
> guess this is proof that most computer users have no imagination.
 
I used to see a lot of "Linksys" SSIDs without wireless security. Once I
considered connecting and changing it to something like "I'm so
insecure!" or "I need my WPA!",
 
--
Mark Lloyd
http://notstupid.us/
 
"HUMANISM: an exaltation of freedom, but one limited by our need to
exercise it as an integral part of nature and society." [John Ralston
Saul]
N_Cook <diverse@tcp.co.uk>: Aug 26 03:39PM +0100

Ignore the studding, it did not look right.
1x1 inch L section blacked aluminium, ends cut down to lodge into the
cab edges, 1 CSK woodscrew each end
G. Morgan <sealteam6@osama-is-dead.net>: Aug 26 06:07AM -0500

ceg wrote:
 
>but "ACCIDENTS"), please post them since the accidents don't seem to exist
>but, if cellphone distracted driving is hazardous (which I would think it
>is), then they must be there, somewhere, hidden in the data.
 
 
There is probably no check box on the form for cops to check "distracted
cell phone user" on the report. As if the cop would know the cause
anyway...
 
As long as you're agreeing that phones & text don't mix, that's one less
driver I have to worry about :-)
 
 
--
 
They who can give up essential liberty to obtain a little temporary safety,
deserve neither liberty nor safety. - Ben Franklin
G. Morgan <sealteam6@osama-is-dead.net>: Aug 26 06:16AM -0500

ceg wrote:
 
 
>So, we really have two extremely reliable components of the paradox.
>a. Cellphone ownership has been going explosively up in the USA,
>b. All the while *accidents* have been going down.
 
 
There are dozens of other factors contributing to the decrease in
"accidents" (I call them collisions because 'accident' implies nothing
could have prevented the collision).
 
Better roads, smarter cars that brake automatically, awareness of the
danger lead to conditioning people beinf boy "as" st - plus the high
fines associaed with talking in an active school zone,
--
 
They who can give up essential liberty to obtain a little temporary safety,
deserve neither liberty nor safety. - Ben Franklin
jurb6006@gmail.com: Aug 25 11:58PM -0700

>"attempts to start, surges repeatedly, but cannot successfully run..."
 
Plus they can do that all by themselves. Many have a low current mode, basically a "wait to start" that allows a 50K resistor or whatever to bleed up a cap big enough to run the main chopper enough to start and then a rectifier coming off a, well tertiary primary ? Works. the it feeds the driver chip. When that filter gets ESR or low capacitance, then this happens even at rated line voltage.
 
However this does not always cause a catastrophic failure. Some units can sit there for weeks and still only need that one cap. And others could be alive one day and dead the same day. It all depends on what is critical and what is not.
jurb6006@gmail.com: Aug 26 12:21AM -0700

>"** The parallel 0.47ohm resistors are there for the VI limiter circuit ( not >drawn) saving the V-FETs from destruction if driven into a low impedance or >short. "
 
I saw the real schematic, I have it. Yes it is a doosey (sp) Runs you all over the place but oh well, I still got the jist of it. The VI limiter circuit as you call it, which I would simply call a current limiter (with an enhancement to allow said current at higher output voltages)should be able to handle this. Usually it is basically called a dual slope detector, but what Sony likes to do apparently is to get ten nerd who actually did solve not only that rsistor cube, but that other thing going around on the net.
 
Why do you want to get every last iota of power or whatever of whatever you use ? Well basically because you got shareholders. Every old thing we own is their mistake.
 
I used to be almost Mr Sony but did not want their speakers and most of their amps I could afford. I worked for a Sony Signature dealer and ASC, I also worked for another Sony ASC a bit later. Well actually at the same time which they didn't want me to do but so what.
 
but I was always with it for their video equipment, but I did not like the Access systems, I thought they were junk. And then it seems they got skitzoid, like almost being two companies. Alot of them got like that, they got the cheap line and they got the good line. Let's run that credit card and see what you want. I shit you not.
 
Where were we. (damn that was easy to type)
 
Anyway, thusfar we have been dealing with a certain paradigm. Now here is something, and it is not even solid state. Tube/valve circuits that use those regulator tubes. the gas fired ones like 0A2 or some shit, I don't remember. It is lucky there are not alot of these around I think, with all the variacs and DBTs out there, I really think that some of those circuits might be damaged bringing up the voltage slowly.
 
This would happen if say the main rectifier tube took a certain time to warm up and did not give the 0A2 enough voltage fast enough to catch the regulator tube and blew an electrolytic somewhere. Or possibly cause an arc in a totally innocent ECC83 somewhere.
jurb6006@gmail.com: Aug 26 01:24AM -0700

>"
>Using a variac, it is sometimes possible to find a setting where the PSU >attempts to start, surges repeatedly, but cannot successfully run - likely >because the secondary voltage does not rise enough for the control loop to >stabilise."
 
Not to forget the days of the earlier bipolar ones that needed real drive current of the FET ones that needed real drive voltage. (like that bastard Sony)But actually I mean regular MOSFETs. I they didn't get a certain voltage drive they would run away, literally.
 
>"Reckon it is wise to avoid lingering at such a setting. "
 
For what reason would one linger at a setting ? I can understand under certain conditions doing advanced Tshooting, but just firing up old stuff is different and they have NO reason to linger at any setting. If the current goes up too much you shut the motherfucker down now. If it is worth using a variac on it is worth using it right. Godammit.
 
But really you meant what I said, or some shit. That current climbs abnormally you shut down and try to figure it out. If nothing else start disconnecting shit.
 
And actually the DBT is a pretty good current meter.
 
What I want is some incandescent light bulbs from the UK or whatever, and of course sockets to match, because they are 240 volts. sometimes I needed to discharge a cap that I KNEW was at like 300 volts, and I do not mean on tubes, I mean on like a plasma TV. Using a 120 volt bulb is not all that cool, it could fail leaving you with an insidious problem.
 
I have considered two in series but if I ever want to change the wattage that makes a mess, and I do not want any switches.
 
I will do it in digital. Almost. Banks of bulbs, all controllable by unscrewing the lead bulb in any series. And there are a few series' which make an array.
 
Are you with me here ? This is going to look better than a Gene Wilder movie.
N_Cook <diverse@tcp.co.uk>: Aug 26 08:53AM +0100

> The smaller is a 1/4-27 thread. Not 1/4 pipe but .250" O.D. and is not
> very common.
> Eric the machinist
 
I happen to have a few bags of F cons laying around. These dustcaps look
the bees knees, blue sleeving and blue dome over the caps. I could have
used some fine ball chain , as some of that laying around, but in an
audio-vibrational environment it could rattle, methought.
micky <NONONOmisc07@bigfoot.com>: Aug 26 02:50AM -0400

In sci.electronics.repair, on Tue, 25 Aug 2015 17:06:24 -0700, Jeff
>the receiver(s) and the antenna(s), perhaps it might be better if you
>disclosed what problem you are trying to solve. That would narrow
>down the possible devices to only a few.
 
Yes, of course. To use one splitter as a combiner, for two antennas,
and the other splitter as a splitter, to feet the signal to a DVDR and
to a digital-to-analog set-top box that feeds a VCR.
 
Currently, they use separate antennas. The DVDR uses an outdoor style
antenna in the attic** (pointed towards Washington DC) and a antenna amp
The amp makes some of the DC stations come in fine all of the time, and
the rest some**** of the time, but seems to have overloaded some of the
Baltimore stations some of the time^^. The tech support guy at
SolidSignal.com said that weak signal and overload can look alike on the
screen. So I got a coaxial attenuator (before I talked to him but he
suggested it too) and it works to bring back the local stations but at
the same time costs me some of the DC stations. I had hoped there would
be a sweet spot where all of the stations worked all the time.
 
And the VCR set-top-box is connected at different times either to a
simple 8-foot wire that doesn't leave the bedroom, or an inexpensive
flat 1-foot square no-metal-parts-showing-except-the-coax-connector,
amplified antenna. The Zenith set-top box actually has a better tuner
than does the Philips^^^ DigitalVDR and before I got the much bigger
antenna in the attic the set-top-box got more channels than the DVDR
did***. By giving it part of the large antenna's signal, who knows
what channels I might get? and at the same time it will weaken the
signal a little and maybe stop some of the overload at the DVDR.
 
I think both amplified antennas have power injected in their respective
co-ax, but I can do that above the splitters, so the splitters shouldn't
have to carry any power, but it's a good thing I asked here, because it
occurs to me for the first time that if the splitter/combiner does carry
power to both ports, some of that power will go downstream from one
power injector to the splitter/combiner, and back up to the other signal
injector where it willl fight with the power there.
 
If the polarity is the same and the voltage is the same, will this be a
problem? Just because two different injectors both say negative is in
the ring and postiive the center of the plug, does that really mean the
center wire gets the positive in each case, and even if it does, does it
really mean the voltages match? The two signal injectors could output
two DC voltages that are the opposite of each other, I think. ??? So
should I just make sure I have either a non- or one-port- power-passing
splitter?
 
 
 
Footnotes are progresssively more tangential or off-topic.
 
^^the overloaded stations would not be a problem except when I'm not
home and I record them, then come home and find that the recording is
blank or checkerboarded with no sound.
 
**Outside antenna is not possible and imo not needed. The SolidSignal
guy kept pushing an outside antenna even when I said I wouldn't do it.
(I bought the antenna and the amplifier from them.)
 
****Even in the best weather, I can't get every DC station, but I can
get all the major and some of the minor ones.
 
***But I don't have the right remote for the VCR so I can't change the
recording speed to a practical one. So I don't record with it. When
all this other stuff is settled, I have another VCR someone gave me that
might be useful for recordign (The Zenith set-top box actually has timed
recording ability, including turning on and tuning at a certain time to
a pre-chosen channel. It was $40 above the government coupon price, that
is, it would have cost $80.)
 
^^^The Philips is not sold new anymore but is pretty much the same as a
Magnavoxx DVDR still sold afaik. It has lots of design flaws (the
biggest that the clock doesn't keep good time and even setting it on
automatic doesn't mean it will ever have the right time. Putting it on
OFFmeans it will lose (or is it gain?) several seconds every day. (A
friend has a Magnavox and it's no better!) I have to start recording a
minute before the hour and finish a minute after, but this doesn't work
if I want to record two shows in a row on different channels.) But
reading the manual again just now, I realize I forgot the 3rd choice,
manual, where I tell it what the PBS channel is if it doesn't pick it
correctly itself. So maybe it will work better once I do that. I
tink I bought this 7 years ago before digital conversion was mandatory
and used it on analog for a couple years.
 
It also won't display program information when it's recording, and it
doesn't save any program information except channel, time, and recording
length, not program name and certainly not program description. I often
have to start playing it to figure out what it is. But there are only
2 or 3 over-the-air DVDRs sold, and it does the other basic stuff well.
(Plus it has editing and dubbing powers I will never use. )
micky <NONONOmisc07@bigfoot.com>: Aug 26 02:55AM -0400

In sci.electronics.repair, on Tue, 25 Aug 2015 16:49:42 -0700,
> at DC. Many rooftop TV antennas are of this sort, either due to
> the antenna itself (folded-dipole driven element) or due to the use
> of a 75-/300-ohm balun transformer.
 
Ah, of course. I'm surprised I lasted this long without coming across
this before, or noticing it on my own. Now I have to review the last
30 years and decide if not knowing this has caused me any problems.
Off-hand, I don't think so, but I've learned it takes days or longer to
retrieve things out of the corners of my mind.
You received this digest because you're subscribed to updates for this group. You can change your settings on the group membership page.
To unsubscribe from this group and stop receiving emails from it send an email to sci.electronics.repair+unsubscribe@googlegroups.com.

No Response to "Digest for sci.electronics.repair@googlegroups.com - 12 updates in 6 topics"

Post a Comment