Things I Learned: Cutting Raspberry Pi Pico-W Helecopter Noise

Project TouCans has an issue with Pico-W power supply noise acting as RFI over the rig's Bluetooth audio system. I found an interesting "fix" yesterday that I do not suggest you replicate.

What I believe I did was to capacitatively couple the VBUS pin to ground. VBUS is where power comes into the Pico-W in TouCans. When I accidently placed the ground wire for the Pico-W near the VBUS pin, the helecoptering noise went away. You can se that teh ferrule is support just above pin 40, the VBUS pipn. Meanwhile, the socket for the wire is resting on top of the USB connector for the Pico-W board. I used the keyer a bit more. That's how I know I didn't just short the VBUS and ground lines; a thing that would have disabled the keyer altogether. I'll experiment with this more today, but the incident hints at a simple and more polite, less dastardly dangerous fix that could remove the noise.

Here's a video QSO with AB9CA from US-4571 Juan Bautista Trail where it passes through City College San Francisco campus. The helicoptering is easy to her during this QSO.

A note on the ruggedness of the Pico-W

I've had great luck with this board! I've gottten to where I pack a spare, but I've never yet needed one. The board is always operated outside and has held up for the better part of a year. Here's a zoomed out view of its operating environment yesterday on our back deck. So if you're concerned about using a Pico-W outdoors on a rather routine basis, you've got more data now.

Comments

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...

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 ...

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:...

Copasetic Flow

Search This Blog