Digest for sci.electronics.repair@googlegroups.com - 25 updates in 7 topics

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"Mike Marlow" <mmarlowREMOVE@windstream.net>: Oct 30 05:17PM -0400

Danny D. wrote:
 
> She's brand new to teaching, but, it turns out that classroom
> management is a standard problem in these multi-ethnic San Jose
> schools.
 
Well - that's a big part of your problem. Rather than teaching kids things,
parents and teachers rally around excuses for what the things exist. I wish
you the best - deal with the problems you are creating.
 
 
> One teacher uses a bathroom plunger, as his bathroom pass.
 
Brilliant! Shear stupidity - so why shouldn't everyone else follow suit?
 
>> mention, an exercise in futility. What does this really accomplish?
 
> What it (attempts to) accomplish is the reduce undue interruptions of
> the classroom environment.
 
Brain dead thinking. But that's fine - do that kind of thinking where you
live. What in the hell do you really think you are solving with this kind
of approach?
 
 
> jail, if
> even for only 10 minutes (which they can synchronize with other
> friends, if they're clever).
 
You just keep on letting those kids outsmart you. I'm sure you'll win that
way...
 
 
 
> What the pass does, first and foremost, is it discourages such
> intents.
 
Bullshit! Are you and the teachers at that school that stupid as to really
believe this? If so - muck in your own mire.
 
> Also, it allows the teacher to continue teaching,
> uninterrupted, as
> the students just get up, grab the pass, and return, unannounced.
 
Really? Do you even think about the things like this that you post?
 
 
> something they can leave hidden in the hallway while they
> surreptitiously run a'muck about the hallways or outdoors to catch a
> smoke or whatever.
 
Dear Parent...
 
 
 
> Likewise, it prevents multiple kids (from the same classroom anyway)
> leaving the room at any one time.
 
Really? The high paid teacher is this dumb as to not be aware of this
syndrome? Really?
 
 
> or not. It's like the red sign on an airplane bathroom door showing
> it's in use, rather than what we have to do at a McDonalds, which is
> to jiggle the doorknob repeatedly to find out if someone is in there.
 
Yeah - when I was a kid I had a really hard time understanding a locked
door - are you really this stupid? How about facilities that accomodate 4
kids at once - where does that fit into your foolish thinking?
 
 
> And, being so large (on purpose), the kids, who almost certainly don't
> like it, can't lose it easily.
 
Oh man - that just can't be anymore stupid.
 
 
> At the very least, it's objectionable to carry (as you noted), which
> would further discourage the unnecessary potty breaks.
 
Really? What in the hell is the problem you are looking to solve? I think
you have a California mindset which just does not think at all.
 
 
 
> Rest assured, this teacher has at least one kid a day out of her 200,
> walk out on the class without excuse.
 
Really? Then fire the teacher. That is her or his responsibility to make
sure that kind of thing does not happen. Screw the 200 number - that's a
classic over-exageration - how many students in any one class session? The
total number is completely meaningless.
 
 
> all of which are common through all the classes, as she told me most
> of these kids are being weeded out of the system through their
> behavior in *all* their classes.
 
Guess you guys need to improve your school disciplines and forget looking at
magic tokens like stupid wood fobs for a key to the boys room. Do you
really belive that is going to fix the problems you guys have created in
your schools? Really? Are you really that dumb?
 
> comments on their report cards of "very polite", "always helpful",
> "pitches in to volunteer every time I ask", and even once "raises
> hand to answer questions too often!".
 
Good for you! That's what is necessary - not stupid fobs.
 
 
> California, they go through 3 semesters of graduate training, to
> obtain a preliminary teaching certificate, two semesters of which
> have on-the-job training of sorts.
 
Kudos to you for trying to help a new teacher but don't you see that the
problem is so much bigger than that?
 
> their preliminary teaching certificate cleared. At that point, they
> also get tenure (which is kind'a soon, if you ask me), and then
> they're bona-fide teachers.
 
Well - you might want to take the problem up with your school district. You
guys created the problem and stupid ideas like wooden fobs is not going to
fix that problem.
 
 
> training on "classroom management", which I found odd when I saw that
> it's the *first* thing they re-train the preliminary-credentialed
> teachers on.
 
Oh well...
 
> small percentage of the kids (maybe 1/3?) actually care to learn it.
> It's a required class for the rest, which they hope to never see
> again during the rest of their lives.
 
We have to remember? Really? Are you that stupid? They are in school.
They are there to learn what they are told to be taught. We have to
remember? I see the very root of this problem...
 
 
> When is the last time you or I graphed a quadratic equation, for
> example? Could each of us solve a binomial equation to save our lives?
> (Building suspension bridges in the redwoods notwithstanding... :)
 
Competely irrelevent! We did do it when we were in school. What does it
matter at all when the last time was that we did it. I'll tell you that I
have used that knowledge throughout my life - though it may not have been on
a daily basis - but when I needed it, I could call on it. You are making
excuses for dumbing down our already stupid kids even more?
 
--
 
-Mike-
mmarlowREMOVE@windstream.net
Stormin Mormon <cayoung61@hotmail.com>: Oct 30 06:39PM -0400

On 10/30/2014 12:20 PM, Danny D. wrote:
 
> are common through all the classes, as she told me most of these kids are
> being weeded out of the system through their behavior in *all* their
> classes.
 
I've suspected since the beginning that the
bathroom pass is just a bandaid on a larger
problem. This supports my guess.
 
--
.
Christopher A. Young
Learn about Jesus
www.lds.org
.
"Michael A. Terrell" <mike.terrell@earthlink.net>: Oct 30 10:23PM -0400

"Danny D." wrote:
> but, all kids will take advantage of a "free pass" out of jail, if
> even for only 10 minutes (which they can synchronize with other friends,
> if they're clever).
 
 
The local high school has a single person restroom in each classroom.
Problem, solved.
 
 
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
"Michael A. Terrell" <mike.terrell@earthlink.net>: Oct 30 10:25PM -0400

Stormin Mormon wrote:
 
> I've suspected since the beginning that the
> bathroom pass is just a bandaid on a larger
> problem. This supports my guess.
 
 
Parents dumping defective kids on the school system.
 
 
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
krw@attt.bizz: Oct 30 10:49PM -0400

On Thu, 30 Oct 2014 22:23:56 -0400, "Michael A. Terrell"
>> if they're clever).
 
> The local high school has a single person restroom in each classroom.
>Problem, solved.
 
When I was a kid, the only classrooms with bathrooms were kindergarten
classrooms. I guess it does make sense that they all would now.
"Michael A. Terrell" <mike.terrell@earthlink.net>: Oct 31 01:25AM -0400

> >Problem, solved.
 
> When I was a kid, the only classrooms with bathrooms were kindergarten
> classrooms. I guess it does make sense that they all would now.
 
 
It's a lot less disruption to the class. I saw them during the last
hurricane, when the building was used as a shelter for the disabled and
senior citizens.
 
 
 
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
"Mike Marlow" <mmarlowREMOVE@windstream.net>: Oct 31 06:14AM -0400

Michael A. Terrell wrote:
 
 
> The local high school has a single person restroom in each classroom.
> Problem, solved.
 
How are ya supposed to grab a quick cigarette without getting caught that
way?
 
--
 
-Mike-
mmarlowREMOVE@windstream.net
Stormin Mormon <cayoung61@hotmail.com>: Oct 31 08:52AM -0400

On 10/30/2014 10:25 PM, Michael A. Terrell wrote:
>> bathroom pass is just a bandaid on a larger
>> problem. This supports my guess.
 
> Parents dumping defective kids on the school system.
 
CA is noted for the liberal left leaning culture.
Very possible the entire school system is run on
self esteem, and fragile feelings, instead of old
fashioned tried and true.
 
-
.
Christopher A. Young
Learn about Jesus
www.lds.org
.
N_Cook <diverse@tcp.co.uk>: Oct 31 11:57AM

Did they ever exist?
Why would some company make IC eqivalents for ICs that were used in 30
year old domestic equipment? I could understand, for keeping ancient
industrial equipment going. Or is it just another Google-ad income
generator?
eg NEC uPC1167 FM radio IC of circa 1980, apparently equivalent to
NTE1488, complete with apparent datadsheet with OCR/translation errors
from Japanese original data sheet
junebug1701 <junebug1701@gmail.com>: Oct 30 10:33PM -0700

On Thursday, October 30, 2014 8:20:06 AM UTC-5, Robert Macy wrote:
> incoming calls: the ring sounded anemic, like a single tinkle, not to be
> repeated. Pick up phone, and someone was there?! albeit the connection
> sounded like old fashioned long distance.
 
This reminds me of a strange service call I had when I worked as a Bell System repair technician. It was a rural area and the customer complained that none of her phones would ring, but that she knew somebody was calling whenever her dog howled. Sounded crazy to me, but it turns out that she was on a party line which requires a good earth ground on the third (yellow) wire for the ringers. Well, the unlucky dog was chained to a poorly grounded water pipe which also held the ground clamp and wire for the telephone protector. Whenever she got a call the poor dog got a 90VAC jolt! That's one of the reasons the telcos quit grounding to water pipes in favor of the electrical power neutral.
"Michael A. Terrell" <mike.terrell@earthlink.net>: Oct 31 01:46AM -0400

junebug1701 wrote:
> > repeated. Pick up phone, and someone was there?! albeit the connection
> > sounded like old fashioned long distance.
 
> This reminds me of a strange service call I had when I worked as a Bell System repair technician. It was a rural area and the customer complained that none of her phones would ring, but that she knew somebody was calling whenever her dog howled. Sounded crazy to me, but it turns out that she was on a party line which requires a good earth ground on the third (yellow) wire for the ringers. Well, the unlucky dog was chained to a poorly grounded water pipe which also held the ground clamp and wire for the telephone protector. Whenever she got a call the poor dog got a 90VAC jolt! That's one of the reasons the telcos quit grounding to water pipes in favor of the electrical power neutral.
 
 
The reason that they switched was that the NEC required them to. Some
fools couldn't tell the difference between a water and a gas pipe.
 
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
jurb6006@gmail.com: Oct 30 11:27PM -0700

>"The reason that they switched was that the NEC required them to. Some
>fools couldn't tell the difference between a water and a gas pipe. "
 
Um, dude, that is like a really old joke. I mean, it's not like back when you sold your daughters and shit, the telephone was invented at least, but it wasn't yesterday.
 
Actually all kinds of grounding requirements changed over the last few decades. I know of a few because of the house wiring I've done. And then in the audio/video business. I ran across this guy who had a barter deal with the shop. We sold him a projector for some other work or whatever, and he was having a problem after he had the cable put in.
 
Whenever he had the cable hooked up the picture had a hum bar, no matter the source. Like on the DVD he played it, had a hum bar unless he disconnected the cable.
 
Turns out he had two ground rods driven in and for whatever reason there was a ground gradient. A slight ground gradient at power line is not necessarily proof of a fault, depends where they are. And really, we are only talking about interfereing with video which is what, a volt P-P ?
 
It was enough. Well now in my position I of course advised him but really could not say he was in grave danger or anything so I had him made an antenna isolator.
 
So basically, the projector we gave him had the third prong and got ground there. All the shit from there as well as the stereo system was on that ground but the cable box (coax ground) was on another, IIRC he said they were like forty feet away.
 
Another alternative would be to just tell him to cut the fucking ground prong off of all his stuff, but that wouldn't quite be right now would it.
 
Plus get this, I shit you not, this guy is an electrician ! So if he ever did that in his own house, and something happened, damn.
 
But the simple antenna isolator was perfectly legal since the box was still grounded by everything else now.
 
What else would anyone do about that shit ? (and who the hell else gets things this wierd and has to figure the out remotely ?)
 
Yup, I am happier doing vintage audio. Need a side job though.
"Michael A. Terrell" <mike.terrell@earthlink.net>: Oct 31 05:10AM -0400


> >"The reason that they switched was that the NEC required them to. Some
> >fools couldn't tell the difference between a water and a gas pipe. "
 
> Um, dude, that is like a really old joke. I mean, it's not like back when you sold your daughters and shit, the telephone was invented at least, but it wasn't yesterday.
 
 
It isn't a joke, people actually did it. You wouldn't believe the
dangerous crap that the service techs would find on customer sites. Of
course, a fool like you would think that a worker being killed by a
spark around a gas leak is funny. Just like the former cable TV
customer who spliced a plug on his dead cable drop and plugged it into
the wall to try to kill someone. Or another who hack sawed into a .750"
hardline and connected lamp cord for an illegal cable drop, then wanted
to sue the cable company for damaging his TV when the 60 VAC modified
sinewave destroyed the tuner.
 
 
Just because you turn your offspring into whores, doesn't mean anyone
else does it.
 
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
N_Cook <diverse@tcp.co.uk>: Oct 31 08:14AM

On 30/10/2014 15:48, David Farber wrote:
>> normal.
 
> Thanks for that explanation. Everything seems to be working fine. I'll
> reassemble it and stop worrying about it. :-)
 
I never expected to see a blinking LED inside (nothing seen of them on
the outside) an audio amp. Suspecting it may sometimes be possible to
end up with a clicking sound coming over the audio, via shared ground
routes or whatever - but there are such blinking LEDs in normal operation
dplatt@coop.radagast.org (David Platt): Oct 30 12:01PM -0700

>Hip Hop vs O'Reilly back then. It went on that way for years until the
>station changed from Hip Hop to some other format, then the interference
>went away.
 
The station engineer might have been telling the strict truth... it
would have taken a spectrum analyzer or modulation meter to be sure.
 
Commercial FM is generally allowed a +/- 75 kHz carrier deviation.
Due to the way FM works, and due to the fact that the station is
transmitting a stereo subcarrier (centered on 38 kHz, with its own
sidebands going out as much as 15 kHz on either side), the FM
station's actual RF "footprint" can easily have significant energy 120
kHz on either side of its nominal carrier frequency. That's more than
half-way out to the "alternate" channel center, 200 kHz away. If the
station tends to run "loud" (highly compressed audio, cranked all the
way up) then the "wide footprint" is likely to be present much or most
of the time.
 
Things can be even worse these days, since many stations are also
transmitting in-band/on-channel digital subcarriers which go out even
further.
 
A lot of FM radios/receivers have fairly "broad" intermediate-
frequency filters... e.g. one or two crystal filters with 220 kHz or
even 250 kHz bandwidth. Such broad receptivity lets almost all of the
"desired" station's signal in... and that's good for low-distortion
stereo reception since you get the whole stereo subcarrier.
Unfortunately, if there's a strong signal on the "alternate" channel
(200 kHz away), that signal's outer sidebands will end up getting
through the filter, and will probably affect the stereo subcarrier and
increase distortion or "break through" into audibility. If you're
trying to tune in a weak, distant signal that's on an "adjacent"
channel to a strong local (100 kHz away) the problem is even worse.
 
There are ways to work around this:
 
- Use an FM tuner which has a narrower IF bandwidth. Better tuners
often have a wide/narrow switch setting, with the narrow setting
using different (or more) crystal filters with reduced bandwidth -
200, 180, 150, or even 110 kHz.
 
The narrower filters can eliminate a lot of adjacent- and
alternate-channel bleedover. The price is higher distortion
(especially in stereo) since the outer FM sidebands of the desired
station are also eliminated by the narrower filters.
 
- Use a directional FM antenna, and aim it in the direction which
gives the best results. This may be "aimed towards the desired
station" (increasing its relative strength), or "aimed at an angle
away from the undesired station" (to put the interfering station in
a "null" in the antenna's reception pattern).
Phil Allison <pallison49@gmail.com>: Oct 30 04:36PM -0700

Michael Terrell wrote:
 
> Adjacent channel interference like that is caused by the IF bandwidth
> and the skirt. The IF transformers aren't brick wall, the amplitude
> drops away slowly outside the desired bandwidth.
 
 
** FM receivers have multiple stages of IF band limiting making the falloff very sharp outside the needed 200kHz.
 
 
That allows a local
> station to be strong enough to cause problems.
 
 
** Nope - the FM detector ( ratio or quadrature) is also tuned to the centre of the IF strip and will not demodulate an out of band signal.
 
 
.... Phil
Phil Allison <pallison49@gmail.com>: Oct 30 04:41PM -0700

William Sommerwerck wrote:
 
> > Long as a particular band has less width than double the IF frequency,
> > no in-band images will occur.
 
> Did you actually read what I wrote? The second sentence says that.
 

** It says NOTHING the sort - Wanker boy.
 
 
> In the third sentence, I said "If the LO were //below// the incoming
> signal..."
 
> Do the math: 88.1 minus 10.7 plus 21.4 equals... what? 98.8?
 
** Garbage.

With the LO at 77.4, the image is at 66.7
 
The FM broadcast band does not suffer from in-band images long as the IF is 10.7MHz of higher.
 
 
... Phil
Phil Allison <pallison49@gmail.com>: Oct 30 04:48PM -0700

O Ian Jackson wrote:
 
> >They were invariably used as low side oscillators.
 
> The fact that some what might now be considered 'highly desirable
> collectibles' had low-side LOs doesn't mean it became a standard.
 
 
** Never said it was "standard" - just quite common.
 
Proves you are wrong - sonny boy.
 
 
 
 
 
> Not the present FM band. However, in the USA FM started life between 42
> to 50MHz* but this was essentially experimental. After the war, it was
> allocated the present band (87.8-107.9 MHz).
 
 
** Huh? What is the relevance of that crap ?
 
 
 
ATC (AM, of course) breaking
> through on 97.3MHz (at least on my kitchen radio)!
> --
 
** So that is your only case?
 
Piss off fool.
 
 
.... Phil
 
 
"William Sommerwerck" <grizzledgeezer@comcast.net>: Oct 30 05:04PM -0700

"Phil Allison" wrote in message
news:ba56876f-a7d1-4673-996f-6d468e77e692@googlegroups.com...
William Sommerwerck wrote:
 
> > Long as a particular band has less width than double the IF frequency,
> > no in-band images will occur.
 
> Did you actually read what I wrote? The second sentence says that.
 
 
** It says NOTHING the sort - Wanker boy.
 
It says exactly that. It's amazing that someone as intelligent as you can't
understand plain language.
 
 
> In the third sentence, I said "If the LO were //below// the incoming
> signal..."
> Do the math: 88.1 minus 10.7 plus 21.4 equals... what? 98.8?
 
** Garbage.
With the LO at 77.4, the image is at 66.7.
 
Uh... that's right.
Phil Allison <pallison49@gmail.com>: Oct 30 05:20PM -0700

William Sommerwerck wrote:
 
 
> > Did you actually read what I wrote? The second sentence says that.
 
> ** It says NOTHING the sort - Wanker boy.
 
> It says exactly that.
 
 
** FFS learn to read you autistic idiot.
 
MY post say there are NO in-band images at all - neither from high nor low side injection of the LO.
 
 
 
 
> ** Garbage.
> With the LO at 77.4, the image is at 66.7.
 
> Uh... that's right.
 
 
** Wot a thick head.
 
 
.... Phil
"Michael A. Terrell" <mike.terrell@earthlink.net>: Oct 30 10:21PM -0400

Phil Allison wrote:
 
> That allows a local
> > station to be strong enough to cause problems.
 
> ** Nope - the FM detector ( ratio or quadrature) is also tuned to the centre of the IF strip and will not demodulate an out of band signal.
 
 
More Philshit, as always. It's a damned good thing you didn't design
and build deep space telemetry equipment. Even business radios used
expensive crystal filters to reduce adjacent channel interference,
instead of 50 cent IF transformers. Digitally tuned FM receivers can
still receive an adjacent channel, but more than a channel away it
becomes quite distorted. Go back to hacking old stereos.
 
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
Phil Allison <pallison49@gmail.com>: Oct 30 08:24PM -0700

Michael Terrell wrote:
 
> > ** Nope - the FM detector ( ratio or quadrature) is also tuned to the centre of the IF strip and will not demodulate an out of band signal.
 
> More Philshit, as always. It's a damned good thing you didn't design
> and build deep space telemetry equipment.
 
 
** Desperate liars resort to abuse when they have no case.
 
 
> Even business radios used
> expensive crystal filters to reduce adjacent channel interference,
 
** Not one bit relevant to *wide band* FM broadcast receivers.
 
 
> instead of 50 cent IF transformers.
 
 
** Which, when used in multiples, produce sharp roll ofsf at the skirts of the pass band.
 
 
> Digitally tuned FM receivers can still receive an adjacent channel,
 
** More irrelevance, it matters not how the LO is tuned.
 
 
> but more than a channel away it
> becomes quite distorted.
 
 
** Tuned FM detectors are like that.
 
 
>Go back to hacking old stereos.
 
 
** Go back to washing dunny floors, you pathetic ass.
 
 
 
.... Phil
"Michael A. Terrell" <mike.terrell@earthlink.net>: Oct 31 01:44AM -0400

Phil Allison wrote:
 
> > More Philshit, as always. It's a damned good thing you didn't design
> > and build deep space telemetry equipment.
 
> ** Desperate liars resort to abuse when they have no case.
 
 
DING! DING! DING! Whenever you have no clue you start your 'Angry
Dumbass Dance', and call people a liar. All you do is prove what a fool
you are.
 
 
> > Even business radios used
> > expensive crystal filters to reduce adjacent channel interference,
 
> ** Not one bit relevant to *wide band* FM broadcast receivers.
 
 
Only if you have the I.Q. of a rusty doorknob.
 

> > instead of 50 cent IF transformers.
 
> ** Which, when used in multiples, produce sharp roll ofsf at the skirts of the pass band.
 
 
Define sharp. If it is too sharp, it causes distortion in the
recovered signal. Each transformer has an insertion loss in the IF
stages. FM radios use just enough tuned circuits to get barely
acceptable performance. Even the cheap Murata ceramic filters have a
sloppy skirt. The only advantage is that they don't need aligned during
manufacturing.
 
 
Cram your bullshit and look at it on a network analyzer. Oh, that's
right. You have no real test equipment, just junk from a '70s TV shop.
You want to talk wideband? One of the Telemetry products we
manufactured had an IF range from 1 KHz to 20 MHz bandwidth at the -3 dB
points. They had to be aligned on a network analyzer, or with a
calibrated sweep generator to achieve the proper skirt.
 

> > Digitally tuned FM receivers can still receive an adjacent channel,
 
> ** More irrelevance, it matters not how the LO is tuned.
 
Sigh. More of your stupidity. Digital has no AFC, so it can't be
pulled off of center.
 

 
> ** Tuned FM detectors are like that.
 
> >Go back to hacking old stereos.
 
> ** Go back to washing dunny floors, you pathetic ass.
 
 
Whatever the hell that crap means, but I guess that you've heard it
all your life from people around you. Read a damned book on receiver
design. Analog IF bandwidth is specified at the -3 dB points. That
wouldn't be possible without a skirt. Brick wall requires a FIR filter
or another digital filter that processes a digitized input. The design
I worked on digitized to 50 to 890 MHz range for a 70 MHz IF. That was
followed by a pair of FIR filters for the IF and another pair for the
output bandwidth.
 
 
--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
micky <NONONOmisc07@bigfoot.com>: Oct 31 12:46AM -0400

>> will
>> be appreciated.
 
>Carefully desolder the parts
 
Are they soldered to begin with? They're fused, but I've never seen
solder. My coffee makers may have been older than this one. .
 
 
"hrhofmann@sbcglobal.net" <hrhofmann@sbcglobal.net>: Oct 30 08:59PM -0700

You really need to test the HV before proceeding to replace the magnetron. Do you have a tv repair place anywhere nearby? They would probably be willing to loan you a probe since they do not use them very often any more with solid state displays.
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