qjkxbmwvz

joined 2 years ago
[–] qjkxbmwvz@startrek.website 10 points 18 hours ago (8 children)

I don't think you understand what local control of smart devices means...

[–] qjkxbmwvz@startrek.website 4 points 1 day ago (1 children)

But I thought they smelled bad on the outside?

Chuck Yeager's Air Combat would ask for various airplane specs ("what is the service ceiling of an F-4E?," "what is the ferry range of a MiG-15?"), and you had to flip through a booklet to find the answer.

You could copy the book, but it was fairly long so I guess the friction kept you in check.

[–] qjkxbmwvz@startrek.website 3 points 3 days ago

No one "shatters," "breaks," or otherwise surpasses the diffraction limit. Rather, you operate in such a way that the diffraction limit does not apply.

This is not to take away from these accomplishments at all! All manner of super resolution techniques are fantastic, but they're not violating the diffraction limit; they are violating the assumptions that go into the diffraction limit, or they are using a different definition of resolution (which is completely valid), or both.

[–] qjkxbmwvz@startrek.website 3 points 3 days ago

Just make sure it's really a Confederate flag first.

[–] qjkxbmwvz@startrek.website 25 points 4 days ago (2 children)

Gosh I wonder why they're against mail-in ballots.

Any voter in CA is eligible, and honestly, with the number of propositions and local stuff on the ballot it's essential to do research ahead of time regardless of your political preferences. So much easier to fill it out over a few weeks IMHO.

Beware though, there may be new rules about needing it received rather than postmarked by the election date (which is obviously bullshit).

[–] qjkxbmwvz@startrek.website 10 points 4 days ago (4 children)

I had an...interesting...take home exam in college. The max score was 100, but the test had 200 points. So, if confident, you could answer half the exam and still get the highest score; if not confident in answers, you could answer more questions and rely on partial credit

It was a week long take home, "open everything" (book/Internet, but no discussions online or IRL). In some ways the hardest exam I ever took, but I learned a lot, and some of the questions were specifically meant to introduce new subjects.

[–] qjkxbmwvz@startrek.website 21 points 6 days ago

Right, the SS were much better dressed.

[–] qjkxbmwvz@startrek.website 0 points 1 week ago (1 children)

I would probably add "transmit power" in there somewhere, but I guess if you're assuming regulatory limits then it's not a big variable.

[–] qjkxbmwvz@startrek.website 14 points 1 week ago (1 children)

Never tried it, but hot peppers can be added to birdseed to prevent this


birds aren't sensitive to capsaicin, so it only affects the mammals.

[–] qjkxbmwvz@startrek.website 6 points 1 week ago

Gnarly PDEs aren't exactly the same beast as differentiating single variable polynomials.

[–] qjkxbmwvz@startrek.website 15 points 1 week ago (2 children)

Sounds like this was basically the plot of the first Nolan Batman.

 

Hi,

I am considering upgrading my router (RB750Gr3). I am eyeing the CRS309-1G-8S+IN in the hopes that the fast ISP in town eventually expand to my street (10G fiber).

My question is about L3HW offloading, and how it plays with PBR. Currently, I have a number of rules (/routing/rule), some based on source IP and some on VLAN. The purpose is to route certain traffic through VPNs (WireGuard, but I run on a separate computer, not on the router itself). Example: VLAN10 routes all traffic through main routing table, VLAN20 routes local traffic through router but sends external traffic through VPN-1, and VLAN30 sends everything through VPN-2. I use a number of different VPNs, so it's not just a binary "main route or VPN."

I am unclear how this plays with L3HW offloading. This page ( https://help.mikrotik.com/docs/spaces/ROS/pages/62390319/L3+Hardware+Offloading#L3HardwareOffloading-Inter-VLANRoutingwithUpstreamPortBehindFirewall/NAT ) mentions pbr-cap/usage/lpm-bank but I am unclear if that's referring to what I'd be using. That page also says that only the main routing table is HW offloaded in the context of VRF, so I wasn't sure if that also applied to PBR.

The question then, is, does L3HW offloading 1) Just Work for PBR /routing/rule, 2) only work via Fasttrack (perhaps requiring some redirect-to-cpu switch rules), or 3) ain't gonna work?

To preempt a few questions: I know Fasttrack is a last resort. I am a single household, I don't have concerns about TCAM exhaustion. I am considering a CRS instead of a "true" router due to cost and reduced energy footprint. I also know that I don't "need" 10G; if it is ever offered on my street it'll be via an ISP with a "best effort" policy, i.e., they don't have throttled tiers, so 10G is their only offering (cheaper than we're paying now for asymmetric cable).

Thanks!

 

What I want: I want to be able to route specific clients through different interfaces (WireGuard tunnels), and I want this behavior to persist upon disconnect/reconnect. Clients can change which tunnel, with several VLANs being able to use the tunnels (so a client A on VLAN 124 and client B on VLAN 789 can both use VPN tunnel X or Y at their discretion).

What I have: IPv4 works fine (routing rule src address -> routing table). IPv6 works, but is not persistent, as clients change their IPv6 address. (I have a dinky script where I enter IPv4 address and country, and it will grab a VPN peer from a json file, set it up, and add the IPv4+current IPv6 address to the routing rules. This works well currently; I use Mullvad.)

Any recommendations? Ideas: use IPv6 mangle based on MAC address, but I have been having trouble getting this to work (extremely slow). Another idea is to have a script run and grab the IPv6 address of client (either by hostname or by DHCP lease+MAC info), but I'm not sure if it's possible to trigger a script upon IPv6 neighbor discovery.

Any help appreciated!

 

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!

6
submitted 2 years ago* (last edited 2 years ago) by qjkxbmwvz@startrek.website to c/amateur_radio@lemmy.radio
 

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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