Thomas (K4SWL)Similar ETA: Rediscovering Navigation Skills in the Age of GPS
https://qrper.com/2024/12/similar-eta-rediscovering-navigation-skills-in-the-age-of-gps/
Dylan Beaudette KE6UOP
- 83 Followers
- 58 Following
- 53 Posts
Soil Scientist at USDA-NRCS
Physalia-courses🚀 Kicking off an exciting week with Prof. @edzer leading us through Spatial Statistics in R! 🌍📊 Thrilled to have an amazing group of attendees joining from all corners of the world! #SpatialStats #Rstats #Rspatial
Heck of a time tuning the elecraft AX2 (with 40m coil and counterpoise) on the cw portion of 40m. The stock configuration tunes up easily on 20m. I wonder what I’m missing?
Richard McElreath 🦔Looking for a mind-growing distraction? How about my 3 part intro to Bayesian causal inference. It's like a condensed version of my book, 10 weeks of causal computation in 3 short blog posts. Take with plenty of water. https://elevanth.org/blog/2021/06/15/regression-fire-and-dangerous-things-1-3/
Krzysztof DybaThe final results of my PhD and grant are online! The interactive map with homogeneous land surface types for Poland is available here: https://landsurface.pl/
Basically, the implementation is simple and free. The data is hosted on GitHub, and the raster has been split into smaller tiles using gdal2tiles and displayed on the website using Leaflet.
coolbutuselessQuick benchmark for {naracollide} shows that checking an object for collision against 100 other objects runs at:
* 50k/second when the objects are moving and the collision data structure needs to be recreated each time
* 400k/second when the objects are stationary (and only the primary object is moving)
This is good enough for now. Will investigate quadtrees etc when I need to do some larger N-to-M collision checks.
ARIPBlind Hams Digital Net in 1 Hour! (14:00utc) Allstar nodes 506310 through 506315 or Echolink Node 38020 https://blindhams.wordpress.com/
#HamRadio
#HamRadio
Søren KjærsgaardA manual #antennatuner opens up for a lot of fun 🤩
With a VNA you can watch real-time what happens when you adjust the inductance and capacitor dials, gradually closing in on the desired 50ohm.
Did you notice something funny as I just did? I’m sweeping from 6.9-7.1MHz and initially the 270ohm load impedance shows up as a single dot when the tuner is in ‘bypass’ mode.
Once I switch the tuner to ‘inline’, I get a small line instead. This is the frequency response of the matching network (a T-section) inside the tuner itself.
Had this been a real antenna with its own frequency response, and not just a 270 ohm resistor, the final bandwidth of the system would have been a combination of the antennna and the matching network.
#hamradio #testandmeasurement #hamr #mfj #nanovna #rfengineer
Introducing {naracollide} a simple 2D sprite collision package for #RStats
Supports simple bounding box intersections, but also supports detecting collisions only where there are two overlapping non-transparent pixels.
Kathe Todd-BrownRealities of #AppliedMath
[Me 20 years ago]: Bifurcation points, curls, and fractal dimensions elegantly bring order to systems thought to be disordered.
[Me now]: If you assume a spherical cow and put the dog on it's head then you can solve for the cat and we can all go home.