Bravo November

I’ve been meaning to post this list somewhere for quite some time now.

Ever noticed what brand your local elevators are? I have, but then again, that’s because I’m a geek. I should really make up an identification guide for linking some characteristic hardware features to certain brands on those installations where the original branding is stripped…

Here is the great master list, in order of subjective, or is it objective, quality, by brand:

Otis - these like to last FOREVER - banks of the original ‘Autotronic’ series are still serving happily to this day in a couple of Miami locations! The newer Otis stuff is damned good too… even hydraulic, which is usually the cheap and nasty product line for other brands.
Old-school Montgomery - Unusual nowadays, but still going strong. Of particular note, these have all relay controls, and are immune to even the most severe power surges!

Dover - These often go unlabelled. If you get in an elevator and the buttons are white squares with rounded off corners, and the floor indicator’s a fake LED dot matrix arrangement (it’s really a set of square light/transparent mask assemblies), you’ve got a Dover. The build quality’s good on their stuff, and installation quality tends to be a cut above the rest for some reason.

Thyssen-Krupp: Same as Dover. They bought Dover.. why not? The only reason I’m putting them a cut below is that a few cost-cutting measures seem to have made themselves visible.

Now we start to get to the ones I’m a little iffy about …

Kone / Montgomery Kone: The hardware’s starting to get a bit flimsy as we go down the list here. Traction elevators in this line seem to be prone to freaking out and getting stuck more than usual. Interior panels don’t fit right. I think the best feature Kone’s got going for them is their optical door edge sensor, which can reliably tell if a very small object (like someone’s finger) is in the way. I’ve seen the Kone sensors installed on older Otis stuff a lot. Installation quality, at least in the Miami area, is usually terrible!

A rotten old wood packing crate hanging from a moldy frayed sisal rope over a squeaky pulley dangling down the open center of a staircase - This is vastly preferable to what comes next… trust me.

Schindler - Total, unadulterated crap. Schindler elevators can be expected to break down quite regularly, in very interesting ways.  Even on brand new installations, Schindler elevators will make scraping and grinding noises, randomly fail to level at floors and sit there with the doors closed for long periods of time, or even slap into the springs at the bottom of the shaft at full speed for no particular reason. When I used to go to MDC Kendall campus, one building’s classrooms were only accessible via a pair of Schindler hydraulics, and I got very used to prying the doors open after the elevator slammed into the bottom after failing to level. Newer Schindler door hardware features a frighteningly oversized hatch restrictor mechanism which makes rescue of trapped passengers extremely difficult if access can’t be gained to the top of the cab… and the failure of a single weak plastic part causes the door to jam as soon as it closes, requiring the same rescue procedure. I declare these completely unacceptable.

Yep. There’s the list.

If you’re in a public area right now with some sort of portable wireless device, take a quick look at the list of open wireless networks. Notice those ad-hoc (peer to peer) networks all over the place?

Connect to any of those, and you’ll find nothing other than someone else’s laptop. Perhaps some services will appear via Bonjour, Rendevous, or SMB announce thanks to ‘zero-configuration’ networking, but that’s all you’re going to find. Most likely, you will find one titled “Free Public WiFi”.
What is all this rubbish, and why is it there? The answer is pretty simple, really. The Windows operating system (which I do not use, for good reasons) remembers which wireless networks you were connected to permanently. This is probably a good thing, when you are connecting to ‘infrastructure’ networks with access points; it saves you from having to manually having to reselect the network each time you move from home to school, etc.

This behavior is at the very least stupid, and at the worst, disastrous, when applied to ad-hoc networks.

On an infrastructure network, the network is announced to and detected by the clients by the periodic transmission of a beacon frame. This beacon frame transmits some basic data, such as the network name. (If you’re curious as to exactly what’s in the beacon frame, there’s a nice article on that.)

On an ad-hoc network, every client transmits a beacon frame. Windows remembers to ‘connect’ to an unused ad-hoc network by beaconing… which essentially spams the airwaves with announcements of a network that goes nowhere.

This is, at the best, an inconvenient waste of power and source of interference to existing networks, and at the worst, a gaping security flaw.

Let me elaborate on the security concerns of this for a moment:

Remember the MS Blaster worm? The Blaster worm exploited a bug in the Windows networking stack to inject and execute its code, and to spread. An infected system with one of these wireless networks left on would immediately spread it to any other system that connected to it, probably because it too had been left on there.

Fortunately, the solution to this problem seems to be simple. Don’t connect to these junk networks, like ‘Free Public WiFi’, ‘hpsetup’, etc. Any business or home installation that offers free wireless Internet access will, almost without exception, have an access point. If you do connect to one of these, be sure to disconnect from it before moving to another location.

Mac users don’t have to worry about this; OS X won’t beacon an ad-hoc network unless you’ve chosen the “Create Network…” option. It’ll only connect to one it already sees beaconing.

You too can do your part to fight wireless LAN pollution! By making sure you’re not beaconing rubbish networks, you too can protect the world from the forces of evil!

Ever wondered how to encode or decode text just like your favorite spy station? Read on.

Read the rest of this entry »

Well, let’s see here… I upgraded Wordpress and enabled Akismet, so hopefully I won’t be getting all those terrible little “Please moderate: OMGLOLDISCOUNTPHARMACY1387872348522!!!” emails. By the hundred. Scroll to the bottom of the page, and you’ll see the Akismet Spam Counter indicating how many pots of meat product have been eaten!

… Anyway.

I also got a MORE tag out of the upgrade! I shall use it here.

Based on a class I’m taking now. Identity of professor protected to ensure I don’t get him pissed off… you state-tenured prick.
Anyway. If you just happen to be a professor, and you have a class with around 200 students in it, wherein the entire class score is from 3 exams… here’s how to give an exam… like an evil bastard. Bwahaha. More tag coming right up: Read the rest of this entry »

From: Train Man!0xDEADBEEF

As a proud cattle member of the commuting public here in South Florida, I ride Tri-Rail sometimes. And, like any other trains, Tri-Rail passenger cars have various features onboard designed to ensure safe evacuation of passengers and crew in the event of an accident. Now, some of these features make perfect sense.

You have the typical fire extinguishers, emergency exit windows, exit doors between cars, and door release mechanisms… only, Tri-Rail’s taken things a little bit further in potentially nonsensical ways.

Here’s the first bit of utter nonsense one will find aboard the trains…

This isn’t uncommon at all aboard trains; I think the emergency brake is probably required by some ancient and outdated federal regulation somewhere. My only concern is… why the heck did they put it there? I bet more than once, someone’s lost their balance on that little set of steps and snagged the brake handle on the way down. On some of the older UTDC-made coaches, I also remember there being brake handles like that simply dangling from the ceiling at the ends. Nice.

The only reason I can see for having those handles, anyway, is to allow someone to stop the train if the motorman somehow manages to fall asleep or otherwise become incapacitated at the controls, AND manages to fall on the safety pedal that keeps the brakes from being automatically set anyway. Modern signalling systems would also stop the train automatically if needed. So yeah… if anyone can tell me otherwise, go ahead, but for now, I’m going to declare them obsolete.

But that’s not the least of the weirdness. Here’s the little gem that stood out in particular:

This is a little strip of plastic above a window, seperate from the mechanism on the same window that allows it to be removed from the side of the train as an emergency exit. What it does, nobody knows. It’s right in a place where it’s sure to be accidentally used as a handle by someone who’s lost their balance while getting out of the seats below, though. My guess is it’s nothing more severe than a trigger for an alarm bell, but the warning on it seems a little too harsh for that. “Penalty for misuse: Fine or imprisonment”.

Nevermind the fact that it does not state which sort of emergency it’s to be used in… I think it really makes about this much sense:

Hello! I have a new pet, George, the dust hamster! He likes dark places, ’80s synth-pop music, and the power supplies of Pacific Recorders & Engineering BMX-II (circa 1984) broadcast studio consoles!

In other news, I think I shall apply for a Restricted Radiotelephone Operator Permit. (What is all this nuttiness?). That way, I can officially be chief engineer/operator here… or anywhere else. I’d like to do the GROL testing some time as well… but that can wait for now.

And now, a silly portrait of the engineer at home.

The button at the waist of one of my pairs of pants broke in the dryer. It was roughly a 5/8″ plastic button, kind of thick. Measuring it and the buttonhole with calipers showed 5/8″ to be about the right size.

Searching fabric stores for WEEKS never revealed that size of button to even remotely come close to being correct. The next size up would not fit through the provided buttonhole; 5/8″ would slip out, and anything smaller would do as before, but even worse. Yes, I could have modified the buttonhole, but I’m somewhat slightly lazy and ALWAYS in search of a crazier solution.

I was tempted to try machining a replacement from some scrap plastic before I came across these snap-on “bachelor buttons” in the sewing cabinet. They look a lot like a metal and plastic version of the metal buttons usually found on the waistbands of jeans. The back is a stud with an arrow-shaped end, which is driven into a hole in the plastic stem of the button (which has a metal decorative front on it).

The instructions on the package said to press the stud through the fabric first. Well then… let’s see. About 3/16″ of overlapped cotton twill just refused to be penetrated by any of the large upholstery needles I could find, and certainly not by the arrow tip of the backing stud!

I finally found the answer at my workbench, in the probes on the test leads hooked up to my Fluke 8520A benchtop digital multimeter of DOOM. I had previously cursed these things for being excessively sharp after some accidental pokes. Needless to say, they went right through the fabric.

However, the moment I pulled the multimeter probe tip out, the holes in the layers of fabric conveniently no longer lined up.

I managed to get the stud to follow the probe out of the hole after poking it from the other side, and went to stick it into the back of the button. Oops. The hole there was about half the area of the widest dimension of the arrow shaped bit of the stud. I realize the whole thing stays in place by means of physically jamming into the plastic, but isn’t that a bit excessive? There was no way in heck I was going to get this into place without some implements of destruction. The package, upon referring to it, said to use a mallet. Conveniently nearby was a 16 oz. California Framer hammer.

… With one rather LIGHT tap, the stud went into the hole in the button, bottomed out, shattered the plastic of the button, pierced through the decorative metal front, and ended up in the wood below. Yes, I had just NAILED MY PANTS TO THE WORKBENCH.

After prying all that loose, I tried again with another button from the package, pressing it into place with pliers, and it worked.

So here’s my overall procedure:

Measure once with calipers. Attempt replacement three times. Substitute strange replacement part. Stab twice. Completely, utterly, yet recoverably bollix everything once. Complete quite sucessful repair with inappropriate tools.

I think I have a GREAT new insight into my life based on this…

… So said the cover on the box in the wiring closet. I, of course, HAD to open it to see what was inside. It just contained a couple of monoblock solid-state relays to activate the 120V “On Air” lights when applicable.

How boooooring.

Anyway… I’m now, once again, a student engineer at a college radio station. It feels so good to be back, doing production work, slinging cables, and hanging out with all the nifty people.

Expect to see a lot of related content in the near future. I intend to document my wonderful adventures here, as opposed to posting such things to my personal blog elsewhere and making people interested in that have to read through endless commentary about flying cheese and my dysfunctional family and such.

Oh yes, furthermore… you can find some of my previous silly “hello I am bored in the studio” work at the Soundtrack for Defenestration page. Expect more in the near future. YES. LOTS MORE. Bwahahahahahaha. At some point, I may also add a seperate production portfolio page that I can show off to people who may potentially want to hire me for voiceover work or such other things. (Hey, it could happen.)

As the geek I am, I have far too many devices to use and maintain that use various types of batteries.

My understanding of the chemistries of such batteries is pretty minimal - basically, it’s a little magic box out of which power comes. After a while, you recharge it, or recycle it and get a new one. Simple as that, right?

… Nope.

For sometimes, batteries decide they’re tired of working correctly, and do some very annoying things. One of the most annoying things they do is leaking their internal magic substances, which are totally magical and wonderful when sealed within, but toxic and corrosive and nasty to the outside world. (I’m going to pretend there is no risk of actual explosion or ‘venting with flame’ here, la la la la…)

But.. yeah. Leakage is a pain. I’ve had to clean up everything from slight crystally junk to all-out battery bukkake* in various battery powered devices before.

I thought I’d seen everything, though, until today…. well… what does one make of this?!

My only plausible theory here is that these went into thermal runaway, softening the plastic casings, and inflated like balloons from internal gas pressure.

* This ought to get me some REALLY interesting search hits. XD