drmpeg

15 ms·

181.
by drmpeg 3y ago
Whenever my wonderful dog from 30 years ago appears in a dream, I start to do the math and realize that she would now be 41. And then I wake up.
182.
by drmpeg 4y ago
I wouldn't change things on my account. I certainly understand the density advantage to u.fl connectors. They just grind my gears. Best of luck with the project. I couldn't find anything on "Granita". Is it called "
183.
by drmpeg 4y ago
Sorry, u.fl connectors are horrible and I'll never buy a product that uses them.
184.
by drmpeg 4y ago
I also use this benchmark for a real world estimate. Here's some numbers. For the pretty ginormous Ubuntu kernel config for RISC-V, it's 7.5 hours on the HiFive Unmatched (at 1.5 GHz) versus 25 minutes cross compiled on a E5-1650
185.
by drmpeg 4y ago
Here's the orbit height tracking plot. https://www.w6rz.net/starlinkv2.jpg
186.
Starlink V2 Satellites in Trouble(twitter.com)
163 points by drmpeg 4y ago|68 comments
187.
by drmpeg 4y ago
The https://snapshot.debian.org/archive/debian-ports/ repository is slower than cold snot on a doorknob. Unfortunately, trying https://deb.debian.org/debian-ports/ instead causes problems.
188.
by drmpeg 4y ago
I worked in the same building where Bechtolsheim's company Granite Systems was located (3450 Hillview Ave in Palo Alto). My company was on the 2nd floor and Granite was on the 1st floor. We didn't even know he was there until they
189.
by drmpeg 4y ago
We're on the upswing of solar cycle 25 and activity is increasing. http://www.solen.info/solar/images/cycles23_24.png
190.
by drmpeg 4y ago
Near real-time solar images and video can be found here. https://sdo.gsfc.nasa.gov/data/
191.
by drmpeg 4y ago
Wow, I remember that place as a kid in the 60's.
192.
by drmpeg 4y ago
Dave Ditzel (mentioned in the article) is still involved with RISC architectures. His current company Esperanto is shipping a 1088 core RISC-V processor. https://www.youtube.com/watch?v=5foT3huJ_Gg
193.
by drmpeg 4y ago
Linus Tech Tips just did a video on D-VHS. https://www.youtube.com/watch?v=papQ8xQxizA When I was at LSI Logic, I developed the IEEE1394 interface for the second generation JVC D-VHS decks (the HM-DH40000U and HM-DH5U). I w
194.
by drmpeg 4y ago
When I was at C-Cube Microsystems in the mid 90's, during the bring-up of a new chip they would test fixes with a FIB (Focused Ion Beam). Basically a direct edit of the silicon.
195.
by drmpeg 4y ago
The phrase for this is "hero to zero".
196.
by drmpeg 4y ago
Not quite gone away yet. There are 13 experimental channel 6 stations using ATSC 3.0 to continue sending an analog FM carrier on 87.75 MHz. ATSC 3.0 has reduced bandwidth options of 5.752, 5.671, 5.590 and 5.509 MHz. The 5.509 MHz option is
197.
by drmpeg 4y ago
A 42-50 MHz FM band would have been an interference nightmare. During the summer months, Sporadic E propagation is very prevalent on those frequencies (with high signal strengths). And during large sunspot cycles, regular F2 layer propagati
198.
by drmpeg 4y ago
Good to see gr-dvbgse getting some love. I wrote the code six years ago when there was some hope of getting a geosynchronous amateur radio rideshare on the Air Force (now Space Force) WFOV (Wide Field of View) satellite. Unfortunately, the
199.
by drmpeg 4y ago
The chip it was going to use (the JH7100) never went into production and they had to cancel the project. There's a Kickstarter for the newer JH7110 chip. https://www.kickstarter.com/projects/starfive/visionfiv
200.
by drmpeg 4y ago
Performance compared to a hardware demodulator in a television or set top box. A low SNR signal that the hardware demodulator can easily handle may not work at all with the GNU Radio software demodulator.
201.
by drmpeg 4y ago
It's built into GNU Radio. Look in <install_dir>/share/gnuradio/examples/dtv/uhd_atsc_rx.grc However, it requires quite a bit of cpu and it's performance is terrible unless you're close to the t
202.
by drmpeg 4y ago
The most reliable Websdr for WWV is http://n0emp.ddns.net:8073/ It's in Fort Collins and can receive all six WWV frequencies any time of day.
203.
by drmpeg 4y ago
Same with some of the Union Pacific industrial spurs I'm familiar with here in Silicon Valley.
204.
by drmpeg 4y ago
It's been my browser home page since I got on the Internet in 1994.
205.
by drmpeg 4y ago
I see they've included my high resolution spectrum painter (which I also call "Stupid OFDM Tricks" in homage to Letterman). https://www.youtube.com/watch?v=saac0ZtTeX4 https://github.com/drmpe
206.
by drmpeg 4y ago
Although geomagnetic storms are generally bad for HF propagation, there can be an enhancement at the beginning of a storm. That's what happened today and can be seen in this plot of the Boulder foF2 (the maximum frequency returned from
207.
by drmpeg 4y ago
It is incorrect. As you state, a video/audio channel and a DOCSIS channel would look the same on a spectrum analyzer. Here's a sweep of all the channels (from 80 to 750 MHz) on my Comcast system. This was taken back in 2014, and t
208.
by drmpeg 4y ago
I worked with Les Kohn at C-Cube Microsystems for a very brief time before he left the company in 2000. While he was there, he had completely redesigned the C-Cube MPEG-2 encoder architecture. The previous architecture required a giant boar
209.
by drmpeg 4y ago
I was also a big fan of the i960, and did many designs with the i960CF and I960RP. One of the i960CF based MPEG-2 encoder PCI cards from when I worked at Optivision in the 90's. https://www.ebay.com/itm/18418320824
210.
by drmpeg 4y ago
Here's some Solaris wallpaper. 1920x1080 https://www.w6rz.net/solaris.png 750x1334 https://www.w6rz.net/solarisios.png

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