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c_o_n_v_e_x commented on Installing a mini-split AC in a Brooklyn apartment   probablydance.com/2025/08... · Posted by u/ibobev
conductr · 19 days ago
I also DIY a lot of things like this and find it really ironic how the DIY YouTubers I learn from are constantly better than a majority of professionals, especially given the insane costs they charge (I often see 3-4x equipment cost in my area).
c_o_n_v_e_x · 16 days ago
You're paying for:

- Trade licensing fees

- Liability insurance

- Medical insurance

- A vehicle to move equipment around

- Vehicle insurance

- Tools to complete the job

- The time taken to drive to your residence

- The time taken for the quote itself

- The expertise required to correctly spec/quote equipment

- The tradesperson driving to the city office

- The tradesperson applying AND paying for a city permit to do the work

- The tradesperson driving to a supply house

- Purchasing the equipment on credit

- Transporting the equipment back to your house

- Ripping out and disposing the old equipment (if applicable)

- The time and expertise to install the equipment correctly

- The time vacuum out the lineset

- The time charge the equipment properly with refrigerant

- The time commission the system and make sure it's running properly

- The tradesperson driving BACK to the customer house to be present for a city inspection

c_o_n_v_e_x commented on Ask HN: What are you working on? (July 2025)    · Posted by u/david927
davidsojevic · a month ago
If you're interested in giving the tool a shot, feel free to shoot me an email (take my username and insert an @ after david and a .com at the end) and I'll happily give you access after I get it up somewhere publicly accessible -- possibly in the next couple of weeks.
c_o_n_v_e_x · 23 days ago
email sent!
c_o_n_v_e_x commented on A Quantum Gravimeter for GPS Backup   spectrum.ieee.org/quantum... · Posted by u/purpleko
WJW · a month ago
> BPS depends on terrestrial stations instead of satellites, like Loran, which was used in the past.

> BPS is at least as easily jammed or disabled as GPS.

So which is it? Because LORAN was much harder to jam than GPS. The jamming resistance of any positioning system is mostly based on the ability to overpower the legitimate signals arriving at the receiving antenna. The problem with satellite based positioning systems is:

1. Satellites have relatively little power available to them, which makes their broadcasts rather weak. Terrestial transmitters can be much more powerful.

2. Satellites are very far away, which causes the received power to be very attenuated. Terrestial transmitters can be much closer.

There are many valid reasons to choose GNSS over terrestial approaches, but jamming resistance is not one of them.

Source: I was a weapons engineering officer for the Dutch Navy for many years and jammability of our positioning systems was a constant concern, to the point of ships being equipped with LORAN-C receivers well into the 2000s as a backup for GPS.

c_o_n_v_e_x · a month ago
>Terrestial transmitters can be much closer.

Making them nice targets for the enemy

c_o_n_v_e_x commented on Ask HN: What are you working on? (July 2025)    · Posted by u/david927
davidsojevic · a month ago
I've been working on a "businesses for sale" aggregation/search engine that sources data from all of the major "business for sale" type platforms in Australia and de-duplicates listings, extracts data like revenue/profit/etc, and normalises it all for quick browsing.

I have a couple of family members and friends who are looking to buy businesses (separately), and it's been much more time-consuming than you'd expect just to browse through listings to determine if they're relevant to you or not.

The platforms seem to mostly follow the same format as real estate listings (as the brokers seemingly rely on the same software/data formats), with one big blob of freeform text that contains the various information that you'd ideally just be reading at a glance.

Add to the fact that there are over 15 "business for sale" type platforms in Australia where they have a minimum of 1,000 listings and at least 10 platforms with between 100-1,000 listings, you can easily burn hours looking through them individually.

I'm currently covering 12 of the top 15 (ranked by number of listings they contain) platforms and I just tinker away once or twice a month, adding support for new platforms.

I should probably release it and get some feedback at some point, but I suffer a bit from "it needs more polish before I let people other than my family and friends use it"

c_o_n_v_e_x · a month ago
Living in Australia and interested in buying a business, I can attest to biz4sale-type sites being a real problem.

Deleted Comment

c_o_n_v_e_x commented on Trump exempts phones, computers, chips from ‘reciprocal’ tariffs   bloomberg.com/news/articl... · Posted by u/tosh
goosedragons · 5 months ago
How do these tariffs help the vast majority of Americans? Maybe in a half a decade-decade time they can get a job in some factory as a tech??? Except there's so much uncertainty and so much tariffs even on raw material that it doesn't even make sense from that perspective.

Raising prices on everything is not going to help the majority of Americans. Taxing the rich might have but half the rationale for these tariffs is tax cuts for the rich.

There is no plan or logic to this.

c_o_n_v_e_x · 4 months ago
There's a lot more to manufacturing than "just" being a line assembly worker.

The factories have to be designed and built. This includes all of the manufacturing processes, equipment, tooling, automation, etc. All of which are done by reasonably paid, middle class engineers and trades.

Then you have all the 2nd order businesses that get stimulated. Energy must be provided. Mines, mills, refineries, etc. to make the raw materials. The packaging for the end products. Logistics for supplies and end products.

All of the value above used to be in the US but has been captured overseas for decades now.

c_o_n_v_e_x commented on USAID funding freeze disrupts global tuberculosis control efforts   cidrap.umn.edu/tuberculos... · Posted by u/Red_Tarsius
epoxia · 6 months ago
Norway and Singapore are petro-states. Alaska and Texas (to a much smaller degree) have wealth funds off of resources. Whether they're fiscally responsible with that is up to the state.
c_o_n_v_e_x · 6 months ago
Labelling Singapore as a petro-state is a stretch. Collecting taxes from refining is a very different thing than reaping the benefits of royalties from oil production.
c_o_n_v_e_x commented on Nvidia Stock May Fall as DeepSeek's 'Amazing' AI Model Disrupts OpenAI   forbes.com/sites/petercoh... · Posted by u/samanthasu
eagleislandsong · 7 months ago
Singapore lifted its moratorium on new DCs in 2022 [1], and since then has been expanding its DC capacity aggressively [2].

You're also right that it could be a reporting quirk.

I don't think we can say definitively that Chinese companies didn't use Singapore as a conduit for purchasing advanced GPUs, I haven't come across any evidence for that. (If anyone knows otherwise, please correct me.)

[1] https://www.ashurst.com/en/insights/lessons-from-singapore-d... [2] https://themalaysianreserve.com/2025/01/24/singapore-data-ce...

c_o_n_v_e_x · 7 months ago
c_o_n_v_e_x commented on Nvidia Stock May Fall as DeepSeek's 'Amazing' AI Model Disrupts OpenAI   forbes.com/sites/petercoh... · Posted by u/samanthasu
pylua · 7 months ago
Are you saying Singapore is shipping gpus to china or building data centers inside Singapore for the Chines access ?
c_o_n_v_e_x · 7 months ago
SG is very small country and yet someone was buying 1/3 of the volume of the US market in Q3.

The DC market in SG has a very low vacancy rate meaning there's very little available space.... i.e. where are all those GPUs going if the market has very little space available?

To play's devils advocate, this could be an Nvidia reporting quirk with all of sales in SE Asia being reported as "Singapore" but even then, the numbers still piqued my interest.

u/c_o_n_v_e_x

KarmaCake day949June 14, 2021View Original