Archive for category Amateur Radio
Seven days and 300 miles of pedal pushing:
We rode north to the start of the Cycling the Hudson Valley ride in (wait for it) Hudson, rode south while crossing the Hudson six times, then I rode north from Da Bronx while the other 100 riders proceeded south to the tip of Manhattan and the finish line in Brooklyn. Mary, alas, drove the last few days to avoid aggravating a tender tendon.
While everybody else had a touristing day in Hyde Park, we slept in our own beds for two nights.
Everything you need to know about modern bicycle touring:
The straight line along the right side of the map, from just below the New Croton Reservoir to Hopewell Junction, represents data loss from riding in a valley, plus knocking the coaxial power plug out of the battery pack where the South County Trail becomes one with Rt 100 / Saw Mill River Road for a few miles.
That last day had plenty of hillclimbing, even on the rail trail, but with a rewarding section of Rt 52 that drops 500 feet in a mile; I hit 41 mph while passing under I-84.
A good time was had by all!
Based on having to seal the rear vent hole of the previous earbud, I did the same for the new one:
The audio quality was terrible, so I tried another bud with a foam windscreen over the hole and a hole punched in the middle of the double-sided white foam tape:
The audio remained unintelligible, so I tried an upscale (but still cheap, because surplus) Koss earbud, first without blocking the vents and then with snippets of Kapton tape:
The earphone has three slits on each side, but only the middle slit has a hole penetrating the case; it must be a stylin’ thing.
That sounded better, so I’ll roll with it. There’s supposed to be a foam cover over the housing, but those things always get grody and fall off; there’s not much point.
As nearly as I can tell, contemporary earbud designs optimize for volume (dBm/mV) and thumpin’ bass, all to the detriment of actual audio quality. Based on numerous samples over the years, there is zero correlation between price (admittedly, on the low end) and audio quality (admittedly, with my crappy hearing).
I own a pair of very nice (and thoroughly obsolete) Shure E2c sound-isolating ear beetles that sound great (even with my crappy hearing), but I’m unwilling to chop them up for the bike headset …
After building the mic mount, another dab of epoxy mounted the length of AWG 10 wire I said I wouldn’t use:
The whole point of the complex mount is to expose the two noise cancelling holes on the back of the electret element:
Add heatstink tubing over the entire length of the boom wire, use more black cable ties, shape another foam ball:
And it worked on the first try, not that there’s much to it.
Yeah, that’s the HDR-AS30V camera mount up top: dork mode in full effect.
The last time around, this involved silver soldering the boom wire directly to the mic housing. This time, I filed a fishmouth in the smaller tube and epoxied it to the tube that’ll hold the mic capsule:
The smaller tube is a loose slip fit for #10 copper wire, but that’s really too heavy for the boom. I’ll probably nestle #12 wire inside another tube and epoxy that whole affair in place.
The mic capsule tube needs a rounded notch filed in one end to accommodate the wire.
Much of the boat traffic on the Hudson consists of barges shuttling bulk commodities between the Atlantic and the Port of Albany. I think this is a crude oil barge, based on the Christmas Tree plumbing that was more visible when it passed under the Mid Hudson Bridge:
We crossed the Walkway Over the Hudson westbound, where a work crew was tending a crane. That’s how they do repair and inspection:
The Hudson River has far fewer power boats than in years gone by, probably due to their gallon-per-minute fuel consumption:
It was a fine day for a ride:
The whole reason I got a 3D printer in the first place was to make things that would otherwise be too difficult or tedious by hand or on a CNC mill. Most of the things I make look like brackets and I don’t do sculptures … this stuff solves problems!
Being able to go from “I need a part shaped like that” to holding the thing in my hand a few hours (or, for complex designs, days) later is empowering. Being able to adjust a dimension by changing the source code and “recompiling” to get a new part is wonderful.
These five slides from the presentation show my answers to the question “Why would anyone want a 3D printer?” Clicky for more dots.
You can find those and more by searching for
OpenSCAD source code.
They go along with the sheets of solid models.
A circular polarizer screwed on the lens:
A sheet of linear polarizing film held in front of the lens:
For reference, none of the other instrument faceplates on the bench show anything other than uniform gray, with one exception that points directly to the plastic injection point.
I’d say this plate cracked due to unrelieved internal stresses and not anything I did or didn’t do.