An open letter to the New York Times about its coverage of Advanced Driver Assistance systems

I don’t know what the New York Times is trying to accomplish in its coverage on driver-assist systems, but informing the public is not it.

Driver-Assist Systems Linked to Hundreds of Crashes was your headline, carrying the context-free ambiguous term “linked.” Would you use a headline like “Door bells linked to hundreds of house fires” just because a house that caught fire had a door bell? Perhaps the careless reader will confuse “linked” with “contributing factor” and that would be a gross error.

I’m an avid watcher of Tesla dash cam crash videos on YouTube. The most common scenario is a car without driver assistance crashing into the rear of a Tesla stopped at a traffic light or a traffic backup. Usually the driver at fault was on their phone and not paying attention. It happens over and over. If the roles were reversed and the Tesla with FSD was behind, there would have been no accident because Tesla’s FSD doesn’t drive distracted. So in what way is my crash scenario a “link” between a crash and driver-assistance technology — when the Tesla isn’t even moving?

Where did you mention that there are SIX MILLION traffic accidents in the US every year and and 1.3 million traffic deaths worldwide?

I’ve been testing the Tesla FSD beta for a year now, and used the generally released product for 3 years before that. I know it’s not perfect and left unsupervised it could cause an accident, but Tesla now requires eyes on the road enforced by a cabin camera, and hands on the wheel. Most other cars don’t have that safety feature. What I do know from my own experience is that a human driver plus FSD is far safer than either alone.

So your article said:

Scores of manufacturers have rolled out such systems in recent years, including features that let you take your hands off the steering wheel under certain conditions and that help you parallel park.

Scores? Really? A score is 20, so the plural would be 40. Are there really 40 driver assistance systems? And since the article is mainly about Tesla, you should have mentioned that Tesla doesn’t allow hands off the wheel. Later on in the article you say “[a]n advanced driver-assistance system can steer, brake and accelerate vehicles on its own.” There aren’t 40 such manufacturers with these systems.

Another inexcusable omission is the fact that Tesla has published accident data involving its cars since 2018!

The reader has to go pretty far into the article for the first hint of context:

But he cautioned against drawing conclusions from the data collected so far, noting that it does not take into account factors like the number of cars from each manufacturer that are on the road and equipped with these types of technologies.

Your data lacks context, confuses apples and oranges, and doesn’t define exactly what cases you’re counting. I give you points for noting the Waymo accident data, but what you failed to note was that the Waymo car was at fault in a few of those accidents — the only example you gave was when the Waymo car was not at fault.

Has the Times fired all its editors?

Posted in Autonomous Vehicles, Technology, Tesla, Tesla | Tagged , | 2 Comments

The impact of electric vehicles on the power grid

I saw something online saying that electric vehicles consume so much energy that more than a few in a neighborhood would crash its power grid. They had a few numbers that sounded mostly right, but they lacked context. Here’s something easier to grasp.

EPA estimates for electric vehicles are based on miles driven, assuming 15,000 miles per year (that’s about double what I drive). They say my 2018 Tesla Model 3 LR RWD consumes about 26 kWh per 100 miles, or 3,900 kWh for the hypothetical 15,000 miles. The Tesla Model 3 is the most popular electric car, and most of those are more energy efficient than my earlier model, so I think the choice is reasonable. According to one industry site, an electric hot water heater uses 4,860 kWh per year, more than 15,000 miles in my car.

Context is also important. Refrigerators and hot water heaters use more electricity when we’re awake and using hot water and opening our refrigerators. That’s also where the major demand from heating and cooling of the house happens. The power company refers to these times as peak hours. My power company says peak hours are 11 a.m. to 10 p.m. in the warmer parts of the year and 7 am to 11 am and 5 pm to 9 pm in the colder parts. People who charge their cars at home typically do so at night. My two EVs are programmed to start charging at midnight and 2am.

If every car and truck in the United States were electric, then perhaps the capacity of the power grid would need expansion, but it’s not a short term issue.

Posted in Electric vehicles, Technology | Tagged , | Leave a comment

Baijiali AM/FM/SW radio with MP3 player

The parable tells of a man who found a treasure in a field and sold all he had to buy the field. My new Baijiali BJL-166 FM/MW/SW1-18 radio MP3 player arrived from China today. Save your money; this is no treasure.

Baijiali BJL-166 FM/MW/SW1-18 radio MP3 player

Let’s start with what I don’t like. The MW tuning step is permanently set at 9 kHz. In the daytime the radio got exactly zero MW stations. I live in a weak signal area, but even the cheapest radios usually get something. At night I could pick up MW stations but they were very noisy.

The radio displays a maximum of 4 frequency digits, rounding to 10 kHz on shortwave. I don’t know what the actual tuning step is, but it hardly matters on a radio with such poor selectivity. Even with 10 kHz display, strong stations are heard on several displayed frequencies. It’s not selective on FM either, with a strong station audible on several frequencies. The radio has no automatic band scanning or memory.

There is a raspy tone audible across the MW band up through HF, perhaps less pronounced above 15 mHz. I assume it’s poorly shielded display electronics. It’s not audible with a strong signal. It’s possible that the internal noise was covering up the weak MW stations.

It’s also an MP3 player (no WMA files). It has no earphone jack and no clock, but it does have a sleep timer.

On the good side of the ledger, it does receive lots of FM stations on the whip antenna, crisply, and its tiny speaker does a credible job on some content, but is annoying on other.

Tuning is peculiar. Although the display is digital, the radio tunes like an analog receiver with a slide rule dial. The tuning thumbwheel has resistance, like it’s geared to a pointer. The wheel rotates multiple times in a band, but has a definite physical start and stop point. While your typical DSP radio tuning dial goes around with no stops, this one has limits. If you switch bands, it matters where the knob was on the previous band. Thanks to the gearing (and the lack of selectivity), tuning is not at all ticklish. The second thumbwheel on the side acts as a shortwave bandswitch (there are 18 SW bands) and next/prior track for MP3. The radio has tuning mute, the only reason I would think it’s DSP because it otherwise tunes a lot like the Tecsun DR-920 (an analog radio with a frequency counter).

I spent a little time on shortwave (it was daytime) and picked up some stations on the whip. Shortwave works best with an external wire antenna. CHU is a particularly strong station here on 7850 and with the whip antenna I heard it on 7840, 7850 and 7860.

I thought the case was solid, and seemed to have decent quality. I think it looks good. The lettering was large and crisp, and the display large and easy to read in good light. Perhaps a parent who just wants to listen to FM would be full of praise.

The radio uses an 18650 rechargeable battery, charged with a mini USB cable (supplied). The antenna is 26.5 cm (10.5″). The radio measures 10.5 x 6.5 x 3.3 cm (extra thickness to accommodate the battery). Mine came with no box, just a one-page instruction sheet, battery, wrist strap and USB cable from AliExpress for about $17 including shipping.

Here are the instructions:

Radio Usuer Manual
Posted in Product Reviews, Radio, Technology | Tagged , | 5 Comments

Solar! – EVCHE EC-2110BTS radio

One reason I’m writing this is that a Google search for EVCHE EC-2110BTS returned no hits. We can’t have that!

EVCHE EC-2110BTS AM/FM/SW radio, Bluetooth Speaker, MP3 player

I bought this AM / FM / SW / Bluetooth / MP3 player flashlight from AliExpress in hopes that the solar panel would be powerful enough to operate the radio directly, not just slowly charge the battery — and it does. In full sun the solar panel powers the radio at full volume.

Here are some of my observations:

  1. The manual is 4 pages, most of which don’t tell you anything useful. For example, the radio has an AUX jack that’s never mentioned, nor is the solar panel. But it states twice: “Plase stop using the machine before switch on or off to the power.”
  2. The radio is powered 5 ways: direct from solar panel, 18650 battery, 2 D cells (UM1), 110/220V AC power cord, 5V USB micro cable. A 220V power cable with a Schuko plug was included.
  3. No unboxing video because there is no box. It’s in a shipping bag surrounded with ample bubble wrap.
  4. It has just one SW band, 5.9-18 MHz.
  5. The radio is big! It’s about 6 3/4″ wide, 5 1/2″ tall and 3″ thick including the folded down solar panel.
  6. The radio arrived in good condition except that the solar panel mount was loose. I found out that the radio case underneath the mounting bracket had broken. The solar panel will have to be propped up to use.
  7. The radio mutes while tuning on SW. I’m assuming that shortwave tuning is done in 5 kHz increments. This means that a tiny turn of the tuning dial mutes the radio, advances the frequency 5 kHz and then unmutes the radio. The result is a “chuff, chuff, chuff” sound while tuning the radio.
  8. No earphone jack.
  9. This sucker is loud. Most of the weight is in the 3W speaker.
  10. The manual says not to take the radio apart, and the case is stamped with the same message. I took the radio apart (see photo following) to remove the rattling broken pieces of the solar panel mount.
  11. The internal flashlight reflector had a big fingerprint on it. The flashlight is mediocre, and far less bright that the current breed of lights in emergency radios.
  12. The AUX jack accepted both line and earphone level input OK.
  13. The TF card can be at least 64G. Max not specified in the manual. MP3/WMA/WAV formats accepted.
  14. Manual says it will operate > 300 minutes as a music player or > 500 minutes as a radio on one charge.
  15. Bluetooth paired easily with Windows.
  16. The tuning dial has a “scale” opening, but it it has no marking or numbers for the scale. I don’t think the designers knew what a scale is for.
  17. It does not appear that the charging light goes off after charging is complete (at least not so far after 15 hours).

I think radio this might make sense as a kitchen radio since it can be AC plugged and the audio is quite good for music, plus you can get local radio stations during a power outage in the sunshine.

OK, Google, it’s up to you now.

Posted in Radio, Technology | Tagged , , , , , , | 4 Comments

Fixing things

My father, uncle and my grandfather made their livelihood in large part by fixing things. My grandfather had a sign in his store:

We fix anything but a broken heart

My father was a watchmaker and when I was ready to go out into the world, he advised me not to become a watchmaker because in the future, watches would be electric and the movements in them would be replaced and not repaired. He was of course right.

My uncle repaired televisions, a dying business. I have a very nice but 10 year old Sony flat screen TV that failed. An internet search suggested one particular circuit board was the likely problem, but one on eBay would cost $250 and there’s a chance it wouldn’t work. New TVs of that size don’t cost all that much more, and newer ones have far more features — apps and things, plus a warranty. It’s not worth repairing (and not easy to dispose of either).

I have a cordless vacuum that died. I took it apart and determined that the problem lay in its circuit board. I’m sure I could get a new vacuum for less than replacing the circuit board.

Given my history and upbringing, it really galls me to throw stuff out rather than fixing it.

So, I’m going to try. I have a Ryobi P515 Reciprocating Saw and the blade has started falling out. Over time it fell out more frequently. I disassembled the saw and didn’t find anything immediately wrong, and concluded that it most be wear on the clamp that holds the blade. I tried new blades and that made no difference.

Ryobi P515 One+ Reciprocating Saw

This is far on the low end of reciprocating saws that usually run $100 and up (not including batteries). By the time I add batteries and a charger, a replacement might be $150 – $200. I already have a Ryobi One+ battery set, so I’m biased to try to keep with that ecosystem.

There’s no way anybody is going to repair my saw for $69, but I thought I had a chance to do it myself and I think I found the part that would have to be replaced, an ASSY SLIDING ROD AND BLADE CLA that costs $15.26 (plus $9 shipping).

Ryobi TTI-300309044 Assy Sliding Rod and Blade Cla

I was encouraged by the fact that Ryobi says this is a superseding part, so maybe the new part will last longer than the old one.

Update

I received the new sliding rod/blade clamp assembly, and was presented with a new problem, installing it. The process required removing two retaining rings:

Ryobi P515 Retaining Rings

I actually have a retaining ring tool, but it’s too large for these rather small and very stiff ones. I ended up grinding and filing down my tool until it fit and I actually got the rings off. Perhaps an hour later, the installation was complete and I was able to saw through a piece of rebar with the same blade that fell out after a few seconds before. SUCCESS.

Photo showing P515 opened, motor center, power switch and safety guard upper left

What still bothers me is that I put a blade in the old part and I couldn’t pull it out. Oh well.

Posted in General, Personal | Tagged | 2 Comments

Habitat redo

I have two phrases I learned at Habitat for Humanity that give me comfort; one is:

  • Nobody will notice that except you

That didn’t quite work this time.

Here’s a photo of one of the Greater Charlottesville Habitat for Humanity job sites where I’ve been working the past few weeks. One of my jobs was to frame the access entrances to spaces under the stairs for 4 units. The job consists of cutting molding to size and installing it. The finished job looks like picture frames, so all the angles have to be close, and not all the entrances were perfectly square.

Habitat for Humanity houses.

I screwed up with the angle on one of the cuts and the end result was that I didn’t have enough material to finish the job. I felt bad about it. To try to correct the situation (with the approval a staff member), I took two scraps and carefully glued them together to make a piece long enough, sanded them down, and installed them. It was in a back corner of the utility room, behind a hot water heater, and I thought that with a little paint, no one would ever see the splice.

A building inspector, however, saw the entrance door and said: that space has no AC and as a result mold could grow in there; you can’t have a door. So this week when I arrived on site, all the doors and frames were gone and a drywall patch was in their place; my new job was to mud the patches, covering up any trace of what I did before.

That brings me to my second comfort phrase:

  • That’ll get covered up
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A red radio — the Prunus J-429SW

Can you say “Big black rubber buttons” three times really fast?

The big picture

The Prunus J-429SW is an AM/FM/Shortwave radio with the ability to play MP3 files from a TF/MicroSD card or a USB flash drive. It can also act is a speaker when wired to another device with an AUX or earphone output. It’s powered by a BL-5C battery. The Prunus is available on Amazon for $19.99.

Prunus J-429SW (Amazon photo)

This model radio seems to be marketed to seniors, touting simplicity of operation and a highly readable display with large buttons.

Specifications

BrandPrunus
ModelJ-429SW
AM522-1710 kHz (See Note 1)
FM87-108 MHz (according to the box)
The radio actually tunes 70-108.
SW2.3 – 21.9 MHz
MP3 PlayingTF Card / USB flash
Input PowerDC 5V 500 – 1000mA
Battery 1200 mAh BL-5C (battery included)
Charging time3-5h
Playing Time5-6h (3-% Volume)
Speaker50mm 4Ω 3W
Earphone3.5mm
Dimensions31 * 126 * 73mm
Weight28g (radio) + 25g (battery)
IncludedRadio, battery, user manual, USB charging cable
Prunus J-429SW Specifications

Generally, an AM frequency range starting with 522 kHz indicates a radio intended for the European/Asian market where the frequencies are in 9 kHz multiples. Radios for the North American market start at some multiple of 10, like 520. For radios with digital tuning this is a big deal unless the radio can be switched from one configuration to the other. This radio, however, tunes in 1 kHz steps, so it doesn’t matter. Testing confirmed that AM actually works, but it is the weakest of any radio I own.

Casual use as an FM radio

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Posted in Product Reviews, Radio, Technology | Tagged , , | 4 Comments