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Washington crews destroy first U.S. “murder hornet” nest

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Re: Washington crews destroy first U.S. “murder hornet” nest

#21
1994: We'll need airtight space suits for an Ebola outbreak.

2020: Surgical masks are a bit much to expect people to wear during a pandemic, Ebola has been circulating in Congo since 2014, and we'll need airtight space suits for a murder hornet outbreak.

Truly, the 90s were a simpler time.

Re: Washington crews destroy first U.S. “murder hornet” nest

#22
post #16
post #11

Earlier quoted context omitted.

It is pretty cool tech. One thing I noticed is the battery is depleting from the time it's ordered; probably not a lot of room for a power switch. This one is 3x11mm and weighs 0.15g; https://atstrack.com/tracking-products/transmitters/product-...

Isn't a simple strip of plastics to isolate the battery a common "power switch"?

That'd probably be a good solution if the transmitter didn't need weatherproofing. I suppose adhesive film could be placed over the gap after removing the tab, though.

Re: Washington crews destroy first U.S. “murder hornet” nest

#23
post #16
post #11

Earlier quoted context omitted.

It is pretty cool tech. One thing I noticed is the battery is depleting from the time it's ordered; probably not a lot of room for a power switch. This one is 3x11mm and weighs 0.15g; https://atstrack.com/tracking-products/transmitters/product-...

Isn't a simple strip of plastics to isolate the battery a common "power switch"?

I doubt they use a socket that would allow the battery to be isolated, it's probably directly soldered in for weight and reliability. Otherwise they could just ship the battery uninstalled and let the user plug it in when he gets it. A weight of 0.15g doesn't give a lot of room for extra components like a battery socket.

Re: Washington crews destroy first U.S. “murder hornet” nest

#25
post #16

Earlier quoted context omitted.

Isn't a simple strip of plastics to isolate the battery a common "power switch"?

I doubt they use a socket that would allow the battery to be isolated, it's probably directly soldered in for weight and reliability. Otherwise they could just ship the battery uninstalled and let the user plug it in when he gets it. A weight of 0.15g doesn't give a lot of room for extra components like a battery socket.

Perhaps they could put a tiny antifuse in circuit with the battery inside the IC package. Supply external "programming" current to the IC, and it would melt the antifuse and get the battery going.

Re: Washington crews destroy first U.S. “murder hornet” nest

#28
post #16
post #11

Earlier quoted context omitted.

It is pretty cool tech. One thing I noticed is the battery is depleting from the time it's ordered; probably not a lot of room for a power switch. This one is 3x11mm and weighs 0.15g; https://atstrack.com/tracking-products/transmitters/product-...

Isn't a simple strip of plastics to isolate the battery a common "power switch"?

A strip of plastic means you have to have a spring at that end of the battery, a hole in the device for the plastic strip, and enough structure around the battery to hold the spring and battery separately. The hole also makes waterproofing more difficult.

All of this would add weight and size, and those trackers are really small and really lightweight. Judging by the photos, the battery is just hard wired to the circuit, and the whole thing is encapsulated with a thin layer of epoxy for waterproofing. That's by far the cheapest, easiest, and most reliable way to build something as lightweight as possible.

Re: Washington crews destroy first U.S. “murder hornet” nest

#29
post #25

Earlier quoted context omitted.

I doubt they use a socket that would allow the battery to be isolated, it's probably directly soldered in for weight and reliability. Otherwise they could just ship the battery uninstalled and let the user plug it in when he gets it. A weight of 0.15g doesn't give a lot of room for extra components like a battery socket.

Perhaps they could put a tiny antifuse in circuit with the battery inside the IC package. Supply external "programming" current to the IC, and it would melt the antifuse and get the battery going.

I would think that the engineers developing then already did the cost benefit analysis and decided that shipping them activated (and tested) is the best option for their users

Re: Washington crews destroy first U.S. “murder hornet” nest

#30
post #5

I've never had to deal with a murder hornet infestation, but I can approve of their 'vacuum' method for clearing yellowjacket nests in high-traffic areas. Partially fill a shop vac with soapy water, stick the nozzle as close to the nest entrance as possible, then turn on the vacuum and hear the wasps get sucked into the machine as they try to enter or exit the nest. It takes a few hours, and potentially a couple of s…

I have a mid-grade phobia of stinging insects and arachnids.

I once blew a few hours to anxiously watching youtube videos of people destroying nasty wasp/hornet infestations. (I'm still not sure why. Probably some mix of morbid fascination and aggression fantasy.)

The soapy-water-shopvac trick appeared in a lot of those videos. (Less commonly: thermite, or quad-propeller drones.)

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