kawfey

38 ms·

211.
by kawfey 7y ago
Someone out there just really wants California to burn. To be fair, Cal fire and emergency agencies are well-equipped with two-way radios and repeaters. Ham radio operators don't actually do any direct activities with fire management,
212.
by kawfey 7y ago
Every radio has a signature that it's turned on by listening to its Local Oscillator. [0] We weren't testing the presence of the LO, but instead characterizing the phone's radiated and conducted emissions from it's non-p
213.
by kawfey 7y ago
Correct, typo. We were specifically testing the radiated and conducted (through its charging cable) emissions from the cellphone's processors, display, etc, and needed the radios off in a reverberation chamber.
214.
by kawfey 7y ago
As an RF engineer who has tested frequency spectra and radiated powers of various consumer electronics including cell phones, I've never seen a cell phone (specifically an iPhone 5, A Nexus, a Samsung Galaxy S4, and a razr flip phone)
215.
by kawfey 7y ago
I used to work at the Very Large Array, which didn't have the same radio quiet zone that GBT did, so we were in charge of chasing visitors' cell phones down with a handheld spectrum analyzer and a small horn antenna. People became
216.
by kawfey 7y ago
People don't realize they're exposed to mmwave already. If you're on a jet or ship, in sight of a jet or ship, near an airport (not just going through a body scanner), near a weather radar station, within line of sight of a m
217.
by kawfey 7y ago
I feel like more and more educational youtubers are going to be moving to platforms like Skillshare, Brilliant, and other next-gen educational/learning subscription services that already sponsor them, more or less because they're
218.
by kawfey 7y ago
>iSpooge That is a really unfortunate name. https://www.urbandictionary.com/define.php?term=Spooge
219.
by kawfey 7y ago
It's only a matter of time. When LPL gets ousted, I'm going wherever he's going.
220.
by kawfey 7y ago
The Maidenhead Locator System, paired with the phonetic alphabet (or via CW) is extremely robust, but requires a relatively long string to get to 3m accuracy. https://en.wikipedia.org/wiki/Maidenhead_Locator_System Wha
221.
by kawfey 7y ago
They license the product to car companies like Mercedes [0], and they provide training and licensing to emergency management agencies, which is gaining popularity in the UK, North Yorkshire, for example [1]. Their business model is more or
222.
by kawfey 7y ago
In my area we frequently do service events for races (foot, bike, and autocross), and this is exactly what we do in the hills of the Mark Twain forest in Missouri. It works great, and you don't even need braincells for most of the even
223.
by kawfey 7y ago
Citation needed. I've been a ham in the US for 11 years and not once has this come up. It's a commonly touted threat or rumor that could happen, but not a single proposal has made it through the FCC (or has even been proposed af
224.
by kawfey 7y ago
Its too loud for me, but the vibration motor in mine is also incredibly, boneshakingly loud. It's impossible to ignore, which is great. My iPhone and apple watch are basically silent compared to it, especially when walking or doing any
225.
by kawfey 7y ago
Possibly. A geomagnetic storm in 1989 wiped out power to Quebec and subsequent improvements were made to prevent another mass outage [0], but that was a relatively small solar flare compared to those in the past, which sparked fires and ble
226.
by kawfey 7y ago
It'll take a ridiculously loooooong time for them to even say "CHINA BAD. HK GOOD. DON'T BELIEVE TV." VOA experimented successfully with using other MFSK modes that can be decoded asynchronously, quickly, and with fldigi
227.
by kawfey 7y ago
No cameras must mean no goodies, then?
228.
by kawfey 7y ago
It's valuable if you care about transmitting. Sure you can transmit under part 15 or other unlicensed transmission rules, but you have to maintain extremely low power that is typically not very useful for communication. On PO Boxes, I
229.
by kawfey 7y ago
We're also setting up an AREDN mesh in St. Louis, MO. Most of the fun for me is getting access to skyscrapers and installing and troubleshooting the network equipment and antennas. I'm not really sure what we're going to do w
230.
by kawfey 7y ago
Amazon, or "A very big company with a significant internet presence" like it states on the page? Nothing of value was lost to ham radio, as no ham or ham organization indeed ever used or would ever use that much address space. I g
231.
by kawfey 7y ago
There is a system in place to account for atmospheric effects on radio signals. Here's one example at the Very Large Array, which uses the GPS to measure (via interferometry) and correct for disturbances in the ionosphere: https:&#x2F
232.
by kawfey 7y ago
Lets not delve into the RF Purge, and instead let the research into Cognitive Radio lead us to this kind of free-for-all future, in a managed, automated, non-chaotic kind of way. https://en.wikipedia.org/wiki/Cognitive_
233.
by kawfey 7y ago
https://faradayrf.com/faraday/ 33cm ham band, up to 500kbps, tons of range, especially with yagi/directional antennas, even in a metro area the size of LA. The sad part of this project is that it never took off.
234.
by kawfey 7y ago
This is a pet peeve of mine, but it's ham radio, not HAM. https://en.wikipedia.org/wiki/Etymology_of_ham_radio
235.
by kawfey 7y ago
With encryption you cannot validate that a transmission is truly an amateur transmission, or one from a commercial, government, or military entity. If anything, proliferation of encryption would kill it. Leave encryption to the ISM bands, w
236.
by kawfey 7y ago
I think "semi" is analogous to "commercial interests" as "bicycle" is to "recreational user".
237.
by kawfey 7y ago
Keep in mind that this report has come about with zero peer reviewing (I think it's a little strange it's been published by the ARRL to be honest), and another thing that is missing is that it needs to be correlated with solar act
238.
by kawfey 7y ago
This, to me, is why this request is so unusual. This is much more suited for spread spectrum, secure, short wavelength (smaller antennas) and the like, and its surprising that Thales - a world renowned avionics corporation - is behind the
239.
by kawfey 7y ago
Any word if amateur radio operators are being put into service for this?
240.
by kawfey 7y ago
In my experience, anything other than the Cloud Key is quite unreliable. I have been running it on my Win10 desktop without many issues besides the annoyingly restarting after updating.

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