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joined 1 year ago
[–] [email protected] 11 points 2 days ago

You know you fucked up real good when Mr. Oatmeal gets involved.

[–] [email protected] 9 points 4 days ago

In undergrad I took a class on sleep, and it really stuck with me. I previously had some FOMO-esque aversion to going to bed early, but after that class if I was done with the day and I was tired, I just went to sleep.

It's been a good mentality for us now that we have a small kid, too. No shame in going to bed at 8...

[–] [email protected] 2 points 4 days ago (1 children)

No, that's not really a useful way of modeling it for the case of light traveling through a linear medium.

The absorption/re-emission model implicitly localizes the photons, which is problematic


think about it in an uncertainty principle (or diffraction limit) picture: it implies that the momentum is highly uncertain, which means that the light would get absorbed but re-emitted in every direction, which doesn't happen. So instead you can make arguments about it being a delocalized photon and being absorbed and re-emitted coherently across the material, but this isn't really the same thing as the "ping pong balls stopping and starting again" model.

Another problem is to ask why the light doesn't change color in a (linear) medium


because if it's getting absorbed and re-emitted, and is not hitting a nice absorption line, why wouldn't it change energy by exchanging with the environment/other degrees of freedom? (The answer is it does do this


it's called Raman scattering, but that is generally a very weak effect.)

The absorption/emission picture does work for things like fluorescence. But Maxwell's equations, the Schrödinger equation, QED


these are wave equations.

[–] [email protected] 3 points 6 days ago

What you say?!

[–] [email protected] 8 points 6 days ago (2 children)

I kinda assumed any Mars mission would include some simple centrifugal pod. Seems like even if it's just for sleeping it would be useful.

[–] [email protected] 3 points 6 days ago

I think it depends on who's doing the talking


oil execs aren't idiots, so I think in their case, it's the first two (intentional misrepresentation, bad faith).

Someone repeating what their uncle/Newsmax host/etc. said? Yeah, maybe that's the latter...

[–] [email protected] 4 points 6 days ago

You know what you doing.

[–] [email protected] 2 points 6 days ago

Dispersion and nonlinearities would like to have a word ;)

[–] [email protected] 8 points 1 week ago (7 children)
[–] [email protected] 11 points 1 week ago (3 children)

I'd like to know more.

In all seriousness though, I thought it had some aspects of good, which was odd given that it's satirical commentary on fascism. For instance, gender didn't really matter and women were promoted, and while the shower scene was meant to show how fascism castrates the masses (or something like that, iirc), I thought it was a relatively wholesome scene, all things considered.

[–] [email protected] 3 points 1 week ago (1 children)

I could be wrong, but I think this could be due to how the states' suit is worded? As in, I think it's worded as, "you can't do that in our state," and not, "you can't do that full stop."

From another site:

Attorneys general from 18 other states also sued over the order in federal court in Massachusetts.

Brown [AG filing the suit] noted his lawsuit is similar, but said he felt Washington should lead a separate case because of “specific and unique harms that are brought here.” He also said that “we have a very good set of judges in our bench here in Washington, so I feel like this is the right place.”

(My emphasis.)

So, a good first step, and while this should be struck down in its entirety, my reading is that this was a lawsuit with limited scope, and the injunction matches the limited scope.

 

People often complain about San Francisco's public transit


and to be sure, it's not perfect by any means (multiple separate agencies doesn't help). But the historic streetcars are pretty neat!

They're painted with the livery of various historic streetcars from all over the country (and a few international, I think). Best of all, they run alongside the modern fleet


same route, same fare.

 

Noticed a few days ago that Sutro Tower's red blinking lights are now white. Just asked them on their website form, but wondered if anyone else knows the story with this.

Personally, I miss the red ones!

5
submitted 10 months ago* (last edited 10 months ago) by [email protected] to c/[email protected]
 

Howdy!

I got my Technician in early 2000s, and last year finally upgraded to Extra. Looking to set up a very basic shack.

I'm looking for an HF setup, with most of my use probably using digital modes, but would like the ability to use voice.

Current transceiver is on loan from girlfriend's dad, a Ten-Tec Scout 555


50W HF unit with separate modules for each band. One limitation of this is that the modules set the mode, so it's LSB on 40m, making e.g. FT8 not possible (without some hacking of code or perhaps hacking the module).

Antenna is end-fed with an off-the-shelf 49:1. Currently only have 20m half-wave, but have just enough room for a 40m half-wave in the attic, which is the ultimate goal.

For digital modes, it looks like there are sort of 3 classes of radio:

  • "full digital" where the radio has e.g. a USB port and handles audio, transmit, and frequency set.
  • Some computer-control with RS232, but uses computer audio+adapter to transmit.
  • No digital, use adapter to transmit. This is what the current setup uses (and it works great!)

I'm leaning towards a conventional transceiver, e.g., something from ICOM, Kenwood, Yaesu, (or others) rather than an SDR unit. I'd like the ability to go up to 50-100W if possible.

I don't have a hard-and-fast budget; would like to keep it <$1000 if possible; mostly just looking at used transceivers. Something like a Kenwood TS-590 looks pretty amazing and very "plug-and-play" (but pushing up against price). Something like a Yaesu FT-920 looks pretty feature-rich too; and even something more affordable like an ICOM 706 or even a 725 is probably more radio than I need. Or just grab a new 7300 and call it a day!

Anyway...clearly, I don't know exactly what I want, but figured I'd ask folks with more experience if they have any wisdom. Thanks!

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