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"You get delivery confirmation," Perdomo said. "Unlike walkie-talkies where you send something out into the void, there's no guess work here." Bridging the gap between WhatsApp and a satellite phone is the point. "The experience of using this should be the same as a messaging app on your smartphone," she said, though it comes with a bit more juice. A GoTenna can last up to a year and a half on a single charge if it remains off, and its lithium-ion battery will last for 72 hours of occasional use, Perdomo said.

GoTenna is taking preorders starting Thursday, For $149, you get a pair of devices, Following the first batch of sales up to $50,000, GoTenna plans to raise the price to $299 per pair, Not often does a hardware startup go from product inception to full-blown vincent van gogh starry night iphone case company without a major financial backer, Yet GoTenna managed to hatch out of Brooklyn's NYC Resistor hacker space -- where 3D printer company MakerBot got its start -- without the footing provided by a venture capitalist, Prior to a much-needed funding round late last year, led by firms Andreessen Horowitz and Bloomberg Beta, GoTenna was completely self-funded for much of its first year..

The brainchild of Perdomo, a former journalist and startup product manager, and her brother and now-CTO, Jorge Perdomo, the company was born from the connectivity nightmare following 2012's Hurricane Sandy. In the aftermath of the storm that devastated the tri-state area that fall, many residents were facing downed cell towers that left them out of contact with friends and family. That's precisely why GoTenna isn't aimed solely at off-the-grid trips like hiking and camping. Its other use cases are traveling abroad without a dedicated SIM card, attending large-scale events like concerts and sports matches, and during natural disasters that leave cell service crippled and unreliable.

Now that it's on sound financial ground, the team of six -- four additional engineers vincent van gogh starry night iphone case alongside the Perdomo siblings -- are using a presale campaign to gauge demand for their first batch of GoTennas, The road here, however, was complicated and not without failure, "Our first device worked on the 900 Mhz band and was huge and worked over the audio jack," Daniela Perdomo explained, GoTenna was originally conceived as a kind of phone case that would forgo the need for a wireless accessory, However, that frequency -- allocated for amateur (also known as ham) radio and some walkie-talkie equipment -- wasn't reliable enough, It cost the company more than just a few product design iterations to maneuver to something wireless..

"We are now at a device that is Bluetooth LE-enabled that works on the 151-154 MHz range," Perdomo said. "The propagation characteristics of these waves are so fantastic. They like to turn corners, go over mountains, they interact with matter well."Even more challenging than designing a slide-able, tiny antenna, and ensuring that the device's own circuitry wouldn't interfere with its capabilities, was creating their communication network. It needed to be one that could operate without talking to a server and wouldn't choke on itself as it expanded.

"Some of the more interesting and novel stuff we're doing is on the network layer," Perdomo said, "The No, 1 thing is how do we make this work without any central server -- every one single person being their own autonomous node."Then there's the matter of increasing the distance and number of devices while avoiding interference, often a problem with mesh networking apps that attempt to create Bluetooth webs using the limited native antenna inside a smartphone, "Even if there's a million people hitting send in the same area of influence vincent van gogh starry night iphone case at the same second, how do they not all step over each other?" Perdomo said..

The team decided that asynchronous bursts of text, instead of real-time voice, was the way to go and relied on rigorous testing to ensure it could be sustained at scale. "People have been using radio frequency technology for a century. That's easy to model out," Perdomo explained. Still, the company has put hundreds of devices within range of each other. And on the virtual side, many more. "We've been running simulations with not hundreds, but thousands and thousands of people," she added. "We learned a lot. It's hard to work with these invisible things and getting to be really power-efficient and transmitting at the range you want, and getting to the right people."Boiled down singularly, the scrappy team that backed their hardware startup with their own money thousands of miles from the heart of Silicon Valley learned the oft-quoted tech lesson: Hardware is hard.

"Radio frequency engineering is really hard, It's truly a black art," Perdomo said, If all goes according to plan, GoTenna's black art will be what powers a seamless experience that, like most modern technology, we often use as if it really were magic, The Brooklyn-based startup is offering a solution for off-the-grid travelers who need low-cost connectivity for their smartphone -- and it doesn't rely on satellites, Our modern, wired society often romanticizes vincent van gogh starry night iphone case going off the grid, Pack-toting hikers bravely venture into areas without electricity or -- gasp! -- cell service, unfortunately inhibiting the posting of that picture-perfect Instagram shot..

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