Tag Archives: electronics

I Like Radio

I like radio.

In fact, I’m fascinated by the entire electromagnetic spectrum. Some consider it overreach to include direct current, like the electricity produced by a battery, but the AC electricity that powers most homes and offices definitely belongs. AC power oscillates, changing direction and then back again in some approximation of a sine wave.

sine

For most AC power in America, this occurs 60 times per second. For years, this was to as 60 cycles per second until the late 1960s when it was changed to “Hertz” (Hz). This name change was to honor Heinrich Hertz, the German physicist who proved the existence of electromagnetic waves. Unfortunately, since Hertz had been dead since 1894, we was totally unaware of the honor. Perhaps the living physicists put their sliderules and partied to songs like John Mellencamp’s Hertz so Good. [I know the song was recorded at least ten years later, but physicists are not big partiers, so it may have taken them a while to pull things together.]

spectrum

There are radio waves as low as 3 – 30 Hz, referred to as “Extremely Low Frequency,” but most of us don’t notice them until somewhere around the AM Broadcast band. The spectrum continues through shortwave, or high frequency (HF), very high frequency (VHF), which includes television*, FM radio, and aircraft communication. Ultra high frequency (UHF) include a number of other radio services, including cell phones. Microwaves, which are useful for radar and reheating leftovers start around 1 gigahertz (GHz) up to about 40 GHz, are next.

Going up. Next stop includes infrared through ultraviolet; smack dab in the middle is visible light. I think it’s safe to say that visible light was the first segment of the electromagnetic spectrum to which humans were aware. In fact, to many people, “spectrum” is what you see with a prism or in a rainbow.

Once you get above ultraviolet, there are X-rays and Gamma Rays, which have the ability to pass through matter and create an image that can be recorded. However, they also have an additional characteristic—they become ionizing, which means that they can change the electrical charges in matter. Ionizing radiation can cause cells to mutate. While comic book storylines propose that mutations result in superpowers, that’s just a STORYline. In actuality most mutations are bad; however, bad mutations can be useful, if applied to a confined area, such as a cancerous tumor. When the cancerous cells mutate, they often die.

To the best of my knowledge, the only thing above gamma rays are cosmic rays, but who knows what remains to be discovered.

Don’t touch that dial. I’ll be back soon with even more.

* I find it disappointing that many people do not know that with a simple indoor antenna your HD flatscreen smart television will receive the local television stations without cable. Picture quality is almost always better, because the signal doesn’t have to be compressed the way it is for cable. In addition, when television switched from analog to digital, they each ended up with three channels that fit in the same bandwidth as the old analog system. Since it’s “use it or lose it,” the other two channels tend to rely on shows that are far less expensive—so you may find Soupy Sales or Mr. Ed. Finally, since a smart TV connects to the internet through your wireless router, you can still access Netflix, Amazon, etc., all without the television being connected to the cable.

The CES and Other Illusions

Every year I read about the great new products at the Consume Electronic Show, this year held 8 – 12 January in Las Vegas. The products are marvelous. They’re amazing. They’re introduced amid a glamor of models, cosplayers, and celebrities. They represent the cutting edge of technology.

Unfortunately, most of us will see, much less be able to use most of them. Like, where are the flying cars?

Driverless cars, domestic robots, virtual 3-D that’s adult—NOT porn (I’m not kidding, that’s what they say), and (wait for it) the ability to see INSIDE YOUR HAIR! Now, given that I have much less hair than I did in my younger days, that just might be important to me. Can I stop by WalMart, BestBuy, or even Brookstone and pick one up? Not so much.

There are the latest video games (yawn)—but—wait! Here’s something special— a smart kitty litter box! Something practical—but it’s for the show, not the store.

Oh well.

I’d write more, but I need to go sweep up around the plain, old-fashioned, low-tech kitty litter box.

Goodbye to an Old Friend

Long before my time, Theodore and Milton Deutschmann started a business to cater to the new field of wireless—specifically, amateur radio. They called their business Radio Shack.

rs

Why? Ships were among the first to adopt wireless communications, and since early transmitters created a signal by generating a huge spark, there was the risk of starting a fire. To minimize risk, the radio equipment was placed on the main deck, in a separate small building, which came to be called the radio shack.

Ham radio operators (no one knows for sure why they’re called “hams”) tended to call the place where their radio station was located as the radio shack, or ham shack. Amateur radio was shut down during both world wars, but hams returned to the air as soon as it was legal to do so. The end of the Second World War provided an added advantage with huge selection of inexpensively priced military surplus radio equipment.

When I was a youngster, there were a few radio stores around town where you could buy components or tools. However, periodically the mailman would deliver a catalog from Lafayette, Allied, or Olsen Electronics. The Sears Christmas toy catalog couldn’t compete with these for the pure lust they generated. I remember building a set of Knight Kit walkie talkies, purchased from Allied.

In the late 1960s, Allied began opening stores in malls, outcompeting most the other companies, which gradually faded away. Allied purchased Radio Shack, but the combined Allied-Radio Shack was determined to be too monopolistic, and the two companies were split up. Allied became the industrial supplier while Radio Shack stayed as the retailer in the malls. Radio Shack sold things that you couldn’t find elsewhere. The TRS-80 computer was one of the first personal computers. They introduced a pocket-sized computer and one of the first laptops. Radio Shack had a niche market—the nerds—but nerds were paying $2,500 for a radio shack computer before the general population knew personal computers existed.

You could find all the parts to build a stereo from tuner to speaker wire. How about a multimeter and a soldering iron? They sold CB radios, of course, but also some ham radio transceivers. Most everything was manufactured by someone else, but carried one of Radio Shack’s brand names.

If you were working on a project and need a 47 ohm resistor (usual price, 10 cents—Radio Shack price, two dollars) you could drive to the mall on a Sunday and finish your project before dinner, even on a Sunday afternoon. Yeah, their components were overpriced, but the convenience made it worth it.

Then, one fateful day, the brainless
pencilnecks management of Radio Shack decided to sell the same products (e.g., cell phones) that you could buy for less money at Best Buy, WalMart, RiteAid, etc.

I’ve been told by Radio Shack managers that the really profitable part of the store was the parts section with those overpriced resistors, capacitors, and semiconductors. You know, the ones you could buy whenever you needed them? The parts selection went from a large section of wall to a metal cabinet with multiple drawers. I think the cabinet got smaller, but in any case, there were fewer and fewer parts available. Cell phones—no problem. Parts? Sorry.

I hear that Radio Shack is still sort of, kind of, in business, but you couldn’t prove it by me. The last local store is now empty. Like Bigfoot or the Loch Ness Monster, you only hear about someone who knows someone whose brother-in-law saw one. It’s too bad—they could have coasted a few more years just on what I spent there.