Skip to main content

Synchronicity and RJ-45

Mark Twain wrote about examples of synchronicity: thinking of a friend in the morning and then receiving a letter from them in the afternoon and whatnot. A similar thing happened here yesterday. I received my RJ-45 breakout boards for the flying Rockmite at lunch. Last night, I listened to Episode 167 of Ham Radio Workbench where Mark N6MTS discussed his newly proposed open headset standard. And there it was, a system (a standard no less! that advocated for using RJ-45 connectors as well as CAT-5 cable between a radio and it's control/output equipement. That use of RJ-45 connectors has strengthened my conviction while inspiring a more complete idea for the whole Flying Rockmite system!

Prior to listneing to the podcast, I was very proud of myself for deicding to put in the energy to add a single RJ-45 connector to the Flying Rockmite so that it woul be easy to maintain. I still intended for the other end of the cable, the end hanging to the ground to look like this


After all, with the recent breaks in the keyer buttons I'd been using, I was back down to a three wire keyer anyway: (also note the San Francisco red yam antenna standoff back there)


But! But! The system proposed in the standard used two connectors:



and that got me thinking—the probably obvious thoughts—what if I used two connectors as well? What if the second connector (and RJ-45 breakout board) was on a tin that held the 12 AA batteries, had three mounted lever micro-switches, and a headphone jack? Everything would be so clean, so simple! We'll see where it ends up. For the moment, I'm looking for a clip, (kind of like an old time broom stick holder) to mount the battery holder into the box:

aforementioned broom stick holders "Crawford Silver Steel Grip Clip"

Any ideas? The battery pack needs to come in and out of the box easily as a unit.

Finally, this will also be a great thing (having a deicated keyer/headphones/battery box with RJ-45 connector) for the desktop version of the Rockmite!

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 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...

More Cowbell! Record Production using Google Forms and Charts

First, the what : This article shows how to embed a new Google Form into any web page. To demonstrate ths, a chart and form that allow blog readers to control the recording levels of each instrument in Blue Oyster Cult's "(Don't Fear) The Reaper" is used. HTML code from the Google version of the form included on this page is shown and the parts that need to be modified are highlighted. Next, the why : Google recently released an e-mail form feature that allows users of Google Documents to create an e-mail a form that automatically places each user's input into an associated spreadsheet. As it turns out, with a little bit of work, the forms that are created by Google Docs can be embedded into any web page. Now, The Goods: Click on the instrument you want turned up, click the submit button and then refresh the page. Through the magic of Google Forms as soon as you click on submit and refresh this web page, the data chart will update immediately. Turn up the:...