auspiv

Other countries are very much the same. Almost always located near giant hydroelectric generation facilities. Brazil + Russia are two big ones that come to mind. Probably China too.

DDR4 prices are up 2-6x in the last couple months depending on frequency. High end, high speed modules (e.g. 128GB 3200MHz LRDIMM) are super expensive.

Believe me, I have read that post/comment quite a few times. There are actually Pi 4 hats for sale for audiophiles (that seem to believe that you need 54000000.000 MHz system clock or whatever it is for Pi4 (Pi3 is 19.2 MHz) for optimal audio) that have an OCXO on them. But in another comment I said I'm not sure my soldering skills are that good.

There is a difference between telling Claude to do something and actually doing it, and writing about it. The fact that this has 199 points as of writing this comments means people want to read about the results. You will probably be quite unhappy to learn that Claude write the majority of the blogpost as well -

"Hey claude read my previous posts and this script and generate a new blog post about this temp control stuff. Generate whatever plots you want. Here's how you can access my influxdb with the data. Here's how you can ssh into the Pi to get the exact running scripts. Ok here's my wordpress token - upload it and the pictures. Oh it looks like your .md to wordpress failed really bad, read a previous post to find out how to format stuff. Oh the tables are still not right, try again." <-- literally what I spent an hour doing last night and refining.

Maybe people would find that interesting as well!

I for sure thought I included one, updating with that in a min!

Others have mentioned the temperature compensation. I've done it and it sounds like I should do that for the next writeup. A simple DS18B20 close to the Pi produces reasonable results.

1 - I like to consider myself an expert eBay-er (my ebay account can legally buy alcohol in the US, and I am myself only 36 years old) but I have not found any ZED-F9P for less than $90 ish. I am aware of the Quactel (sp) modules, and am considering a set for some RTK experiments. Is that what you're referring to?

2 - I've thought about replacing with ocxo but the pads are tiny. My soldering skills aren't nearly as good as my ebaying skills.

3 - it is outputting 16 Hz, chrony is doing dpoll -4 poll 4.

4 - I have done tempcomp (it is not active for the post referenced by this HN post). Fun stuff and probably my next writeup.

Chrony does have ability to do temperature compensation. I've done this and need to do a write up on it. It's not super easy to keep all the parts working together. Basically you feed chrony a table of temperatures and expected clock frequency and it subtracts it out.

I did this at one point, putting the pi directly on some packing foam. It for sure dampened the ambient effects but really I just need to stick the whole Pi in a temperature controlled chamber.

I do have that as well, but haven't done a write up on it yet. It was a $70 GPSDO from eBay (BH3SAP variant running Fredzo firmware with some changes to enable flywheel (generating pulse in absence of GPS PPS)). I have verified it can feed the Pi for NTP. Believe the STM32 driving the GPSDO can as well but it has no ethernet capability as-is

Worth a shot! I'll give it a go later today.

Austin from austinsnerdythings.com here! Posted this last night and went to sleep. Definitely didn't expect to wake up to it #1 on HN this morning!

Some notes that weren't included in this post:

I do have my LEA-M8T generating time pulses at 16 Hz, with a dpoll of -4 in the chrony config. The poll interval of 16 seconds means it gets 256 samples which also improved the stability.

I do also have that mentioned BH3SAP GPSDO sitting next to me on my desk. I had Claude update the firmware to allow "flywheel" behavior so it continues to generate pulses in the absence of GPS PPS. That's coming in another post. Also had Claude update the firmware to spit out TSIP (trimble proprietary protocol) info for lady heather.

Going to go through the comments and answer a couple other things I see.

Happy to answer any other questions!

Get that law abolished ASAP, sounds ridiculous

I describe them in the claude training I'm doing for my company as: super smart, infinitely patient, overeager interns

of course it is, how else are you going to create a drill string that needs to grow to 10000m+ long? drill pipe is flexible(ish, for varying definitions of "flexible") but not nearly enough to do a coil of it for that long. coil tubing is a thing but is much thinner and smaller diameter and isn't nearly as strong. it also can't rotate.

drill string comments aside, this appears to be a very standard deepwater offshore drill ship

Maps is the most frequent offender of something that is "kinda broken" on Firefox - black tiles/boxes, slowness, other things not rendering right. But on Chrome, it works fine 100% of the time.

For even more retro points, have the UI presented by WeatherStar! https://weatherstar.netbymatt.com/

The newest TV broadcast standard (ATSC 3.0) does include positioning information which is far, far, far harder to jam than GPS signals.

https://www.nab.org/bps/

Email is the one notable exception for self hosting. I self host everything, but let email be handled by 3rd parties.

bro your images are giant. every load of the page is transferring 40ish MB. back_panel_back_render.png is 11.3 MB. replace those with smaller versions and click to link to the larger.. but I do see both cloudfront and cloudflare headers so not sure why these aren't being cached by them

Austin from austinsnerdythings.com here - thanks for the shoutout! Four years later these posts continue to be some of the top posts people read on my blog.

Top hits from the past 30 days -

* 3441 hits - https://austinsnerdythings.com/2021/04/19/microsecond-accura...

* 2415 hits - https://austinsnerdythings.com/2021/09/01/how-to-deploy-vms-...

* 1990 hits - https://austinsnerdythings.com/2021/08/30/how-to-create-a-pr...

* 1870 hits - https://austinsnerdythings.com/2025/02/14/revisiting-microse...

so with the combined original post and the revisit post, easily the top topic

Austin of austinsnerdythings.com here - that article does use PPS but there is a different writeup that does use USB that I refer to as my "millisecond accurate" guide - https://austinsnerdythings.com/2021/09/29/millisecond-accura...

P40s are no longer $150. On eBay, they're at least $250 from China, or $400 for US sellers

And I wrote one in Python to climb/turn as well! And to navigate to any of the built-in X-Plane navaids -

https://austinsnerdythings.com/2024/04/06/adding-track-follo...

and the first post in the series -

https://austinsnerdythings.com/2021/10/15/creating-an-autopi...

That’s because you have to add the memory yourself.

Just took a quick look- appears t730 is of DDR3 era and may only have a single slot.

t740 definitely has two slots https://www8.hp.com/h20195/v2/GetPDF.aspx/c06393061.pdf

mini PCs are < 10W also.

I have a full on Dell Optiplex 3070 (i5-9500, 1x16GB memory, 512GB NVMe) running windows 10 that idles at 8W.

I have a lenovo m92p tiny (i5-3570s, released 2012) that idles at 6W.

I did a ZFS SLOG benchmark last year and the author's conclusion what drive it is (HGST SS300) was one of the test subjects - https://austinsnerdythings.com/2023/01/31/zfs-slog-performan...

That said, the model numbers don't really match up - which is explored a bit in the original post. Don't think a 200GB drive exists in this lineup.

Love HGST drives. Also have a SSD400S 200GB that has 18 PB of endurance.

The point is that the verbiage ("To prevent abuse we ask you to sign in before chatting with AI.") implies that only the AI won't work if you don't sign in, not the entire product/site.

double check that math - olympic pool is 50x25x2 meters, or 2500m3. 1 m3 of water is roughly 1 metric ton (1 g/cc = 1 kg/L = 1 t/m3) depending on temperature and such.

57000000g / 5.9 g/cc = 9661017 cc = 9.661m3

There are three related headlines that have been popping up for the last few years, that somewhat contradict each other:

1) "Wind and solar are super cheap and continue to get cheaper"

https://cleantechnica.com/2024/06/25/lcoe-of-solar-wind-stil...

https://www.theguardian.com/australia-news/2023/dec/21/solar...

2) "More solar and wind was installed in the last year compared to last year - 1"

https://www.canarymedia.com/articles/solar/chart-the-us-inst...

https://apnews.com/article/energy-global-wind-report-2024-74...

3) "Utility bills have never been higher"

https://www.utilitydive.com/news/us-electricity-prices-rise-...

https://www.nytimes.com/2024/02/13/business/energy-environme...

https://www.nytimes.com/2024/01/11/us/politics/utility-bills...

So, how can all three of these phenomena be true? Is solar/wind actually cheap? Are utility companies pocketing the difference (hint: yes, in many cases, but co-op prices are also at record highs per kWh)? Is something else going on (meaning wind/solar aren't actually "cheap" in the whole scheme of running a reliable grid 24/7/365)?

The Boeing Starliner craft has had multiple issues (IIRC 5 separate thrusters not working and at least 2 separate helium leaks) since docking with the ISS. NASA continues to stress that Starliner is authorized to return astronauts to earth in the event of an emergency. NASA, at the same time, delayed the return of said Starliner indefinitely until they can analyze more test data.

https://arstechnica.com/space/2024/06/nasa-indefinitely-dela...