Pinned toot
Pinned toot

I think you're all pretty awesome. Wish you the best.

"be creative, computers can't be creative it's the one way to be sure you'll always be relevant"

> Thread of DALL-E AI generated images and their prompts

welp that's it *packs up bag, packs up everyone's bags*

There has been a lot of discussion lately, much of it just plain incorrect, about the relationship between resonance and antenna efficiency. Many incorrectly claim that resonance has nothing to do with antenna efficiency at all, similarly others incorrectly claim that resonance is a direct indication of efficiency. Neither of these statements is true. The reality is that resonance does have a significant impact on how efficient your antenna is, but the relationship is highly non-linear and depends on many characteristics.

Below I have attached a chart hat plots out the total radiation resistance (R_r) vs the measured input resistance (R_in) of a dipole. Efficiency is just R_r/R_in. In other words an efficient antenna will have 100% of its resistance as radiation resistance, and R_in is **always** larger than R_r (since it is essentially ohmic resistance plus radiation resistance). When these two numbers differ significantly an antenna is inefficient. The source for the chart below is here and it gives much of the math if you want a deeper dive:

What is important to note here is that at anti-resonance we see a **huge** R_in value and a small R_r value, this means an anti-resonant antenna will have very high losses. Keep in mind the graph is very hard to read for the values <0.5 in length because the resolution isnt high. But there is significant divergence there as well. Notice at ~5/8ths wavelength antenna would exhibit very significant internal ohmic losses due to heat.


Records detailing when authorities use invasive surveillance tools should not remain secret forever. We’ve been pushing for greater transparency in one courthouse since 2018.


public class UsageReportingDebugActivity extends pvr
* Field Definitions.
* Declared Constructors.
public UsageReportingDebugActivity() { ... }


Show thread

Launch mode: Single task | Orientation: Unspecified

Task affinity:

Process Name:

Show thread

Not sure I can resist... Anyone know what it does? Can't find anything online. It's part of play services so there's a good chance it won't do anything as I've disabled many of it's functions.

Show more
Qoto Mastodon

QOTO: Question Others to Teach Ourselves. A STEM-oriented instance.

An inclusive free speech instance.
All cultures and opinions welcome.
Explicit hate speech and harassment strictly forbidden.
We federate with all servers: we don't block any servers.