Skip to main content

Mt. Davidson SOTA de KD0FNR 4/2/2023

 Finally! Finally the antenna went up with very little fuss or muss. The key seems to be to have a new roll of twine. The little extra bit of heft gets it over the branch. Also! New York!





Park:

Mt. Davidson W6/NC-423

I did the easy-to-me route of taking the 43 to Forrester and Monterrey. From there, Google Maps plots out a walk to the mountain that looks like so:

and vertically speaking was far from the worst hike in the world:



Radio Details:

As I mentioned, the antenna went right up this time. The radio ran like the little champ that it is. Unlike when I was there over the weekend, I did not couple into the antenna. I could stand up, or sit down, and no matter. I did notice that the radio picks up sixty-cycle hum above a certain height (about 10 feet?) Below that height, the band is quieter, but also the radiation angle goes up. I found this out by taking time to experiment with antenna height and see that the Utah SDR finally picked up the RockMite in the morning again. It's been missing the little radio for a few weeks in the morning.  Apparently Utah now bascially in the skip zone for the RockMite's typical antenna placement. This fits with the 20 dB+ results into Candada I've observed.






QSO/RBN spot map:


and a video review!


Happenings of Interest 

I ran into the 'bird man' this morning. He walks the mountain every morning tracking migratory birds. It was a fun conversation. 


QSO Log

Callsignrx RSTtx RSTTime (GMT)Frequency
K6EL59959914:0014058.3
NS2N33932914:0514058.3
N0RZ44959914:1014058.3
N0IPA33942914:3014058.3
WB7BWZ53957914:3314058.3
AD0WB59959915:0314058.3
W7CBR55933915:2014058.3
W7SKH55922915:2214058.3



POTA tx QSL:


QSL rx album:


References

SOTA (Mt. Davidson)

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...