Skip to main content

Things I Learned: 73 Magazine Archives; Video Game Switch/Superglue Reliability; Amateur Radio on Internet Archives

Digging into radio's past, reliability of video game switches as Morse code keys; reliability of Superglue???; Sound in 1948 with amateur radio


I'm finding more and more entertaining ham radio resources. The net is spreading out thanks to my starting point a few weeks ago, Ham Radio Workbench.Podcast.


Today, I wound up at the 73 Magazine archives on the Internet Archives. 73 Magazine was an amateur radio print magazine that ran from 1960 to 2003. (I was kinda stunned about the 2003 end of that range... wow... magazines). Some of the covers are regrettable. Some of the articles are interesting though. At the moment, I'm spelunking through 1967 looking for an article about permeability tuned oscillators mentioned by Bill Meara in the Solder Smoke podcast episode from December 3rd, 2022.

Found the article: https://archive.org/details/73-magazine-1967-10/page/n21/mode/2up

And again, so sorry for the... every gendered thing. 

I'm into week two of the Rockmite handset. Here's what I've learned. The Bao-Lian video game switches have held up. They do however, occasionally just drop out all togethere. I push close the switch and nothing happens. This started on the da switch, and has now started happening on the di switch. It's not a deal-breaker yet, but It's something I'm seeing on the switch:


And yes, the fog collecting on the switch can't help. However, it didn't seem to hurt either!

The superglue has held, and I know superglue, but I hadn't expected it. The switches are intact!


I'm getting closer to finding the info I'm looking for regarding kids and amateur radio from the wayback, as illustrated in this vidoe on sound from the Internet Archives I found in the Digital Library of Amateur Radio & Communications.









Comments

Popular posts from this blog

Cool Math Tricks: Deriving the Divergence, (Del or Nabla) into New (Cylindrical) Coordinate Systems

Now available as a Kindle ebook for 99 cents ! Get a spiffy ebook, and fund more physics The following is a pretty lengthy procedure, but converting the divergence, (nabla, del) operator between coordinate systems comes up pretty often. While there are tables for converting between common coordinate systems , there seem to be fewer explanations of the procedure for deriving the conversion, so here goes! What do we actually want? To convert the Cartesian nabla to the nabla for another coordinate system, say… cylindrical coordinates. What we’ll need: 1. The Cartesian Nabla: 2. A set of equations relating the Cartesian coordinates to cylindrical coordinates: 3. A set of equations relating the Cartesian basis vectors to the basis vectors of the new coordinate system: How to do it: Use the chain rule for differentiation to convert the derivatives with respect to the Cartesian variables to derivatives with respect to the cylindrical variables. The chain ...

The Alcubierre Warp Drive Tophat Function and Open Science with Sage

I transferred yesterday's Mathematica file with the Alcubierre warp drive[2] line element and space curvature calculations to the  +Sage Mathematical Software System  today, (the files been  added to the public repository [3]).  If you haven't used Sage before, it's a Python based software package that's similar in functionality to Mathematica.  Oh, and it' free.  I also worked a little more on understanding the theory, but frankly, I made far more progress with the software than the theory.  What follows will be a little more of the Alcubierre theory, plus, a cool Sage interactive demo of one of the Alcubierre functions[1], as well as a bit about my first experience with using Sage. Theory The theory is fun, but it's moving slowly.  Here's the chalk board from this morning's discussion Alcubierre setup the derivation using something called the 3+1 formalism which means we consider space to be flat, (in this case), slices that are labelled ...

The Valentine's Day Magnetic Monopole

There's an assymetry to the form of the two Maxwell's equations shown in picture 1.  While the divergence of the electric field is proportional to the electric charge density at a given point, the divergence of the magnetic field is equal to zero.  This is typically explained in the following way.  While we know that electrons, the fundamental electric charge carriers exist, evidence seems to indicate that magnetic monopoles, the particles that would carry magnetic 'charge', either don't exist, or, the energies required to create them are so high that they are exceedingly rare.  That doesn't stop us from looking for them though! Keeping with the theme of Fairbank[1] and his academic progeny over the semester break, today's post is about the discovery of a magnetic monopole candidate event by one of the Fairbank's graduate students, Blas Cabrera[2].  Cabrera was utilizing a loop type of magnetic monopole detector.  Its operation is in...