drmpeg

26 ms·

1. 331.▲
   by drmpeg 7y ago

   You must be thinking about Multibus II. The original Multibus (IEEE 796) was very basic. Historical note, the DSP satellite (NORAD missile warning) ground network ran on Multibus based systems from 1988 until 2005.
2. 332.▲
   by drmpeg 7y ago

   Back then, it was used to develop algorithms for real-time MPEG-2 encoder silicon. It can also be used to look at strategies used by other encoders (for example, ffmpeg). MPEG-2 video is still being used today, so it's still relevant.
3. 333.▲
   by drmpeg 7y ago

   I just happened to have that screenshot. If you look at the date over the picture of the Sun, it's 24 Jan 19. The primary reason for the SPARC emulation is to run an old MPEG-2 bitstream analyzer from the 90's. http://w
4. 334.▲
   by drmpeg 7y ago

   Still renders correctly in Netscape Communicator 4.76. http://www.w6rz.net/netscape.png
5. 335.▲
   by drmpeg 7y ago

   I have nothing against CW, it's just not for me. Also, I don't operate HF any longer. At this stage of my ham radio adventure, it's all about SDR on UHF and microwave frequencies. Current project is wideband (10 MHz) digital
6. 336.▲
   by drmpeg 7y ago

   I learned Morse code back in 1992 in order to pass the General class amateur radio license. Back then, the test was 13 words per minute. I practiced for a few months with cassette tapes and over the air copy. After I got up to about 18 WPM,
7. 337.▲
   by drmpeg 7y ago

   https://www.team6502.org/
8. 338.▲
   Chuck Peddle passes away, December 15, 2019(twitter.com)

   7 points by drmpeg 7y ago|2 comments
9. 339.▲
   by drmpeg 7y ago

   Sad to learn that Dr. James Spilker has passed away this year. I worked with him at his company Stanford Telecommunications from 1983 until 1992. He was quite a character back then and was an avid body building enthusiast. Sometimes he&#x27
10. 340.▲
    by drmpeg 7y ago

    It's a problem in the US. The Galileo high accuracy service (HAS) is broadcast on 1278.75 MHz (the E6 signal). But the 1240 to 1300 MHz band is not allocated to satellite radionavigation in the US. It's allocated to radar with a s
11. 341.▲
    by drmpeg 7y ago

    Only when Miami is completely underwater and uninhabitable will there be a change of behavior.
12. 342.▲
    by drmpeg 7y ago

    The system we replaced consisted of an IBM Series/1 and some unknown Xerox computer the size of a refrigerator. The Xerox box was being kept alive by cannibalizing other boxes that had been taken out of service elsewhere.
13. 343.▲
    by drmpeg 7y ago

    Nothing that complex. The link between Buckley and the Patriots was over AUTODIN.
14. 344.▲
    by drmpeg 7y ago

    In the 80's, I was the project engineer for the Air Force DSP satellite ground communications network upgrade. This system used a 20 MB Bernoulli Box to store the early warning messages. It was replaced in 2005. This was the system use
15. 345.▲
    by drmpeg 7y ago

    As a homage, I use this wallpaper for my iPhone. http://www.w6rz.net/solaris_iphone.png
16. 346.▲
    by drmpeg 7y ago

    I have a full duplex system that I've developed. Advantages are: 1) Easy to add power amplifiers and preamps. 2) Works on any ham band. Disadvantages: 1) Cost. Even the cheapest transmit capable SDR can't compete with consumer har
17. 347.▲
    by drmpeg 7y ago

    I used to when I worked at C-Cube/LSI Logic. We had a multimedia processor (MPEG-2/H.264 encoder and decoder) that was SPARC based. It was used in DVD recorders, D-VHS decks (if anyone remembers those), set-top boxes, satellite do
18. 348.▲
    by drmpeg 7y ago

    3450 to 3550 MHz (of which 3450 to 3500 MHz is allocated to Amateur Radio) is being looked at. https://www.multichannel.com/news/spectrum-now-act-introduce... https://www.ntia.doc.gov/files/ntia&#x
19. 349.▲
    by drmpeg 7y ago

    More discussion on the author's Twitter feed. https://twitter.com/cgbassa
20. 350.▲
    by drmpeg 7y ago

    This analysis suggests it was a particular spook satellite. https://github.com/cbassa/satellite_analysis/blob/master/nah...
21. 351.▲
    by drmpeg 7y ago

    Cool, he's using some of my code. https://github.com/drmpeg/dtv-utils/blob/master/dvbt-blade.p...
22. 352.▲
    by drmpeg 7y ago

    Here's a very good tutorial series. It's targeted at hackRF, but has plenty of general info. https://greatscottgadgets.com/sdr/
23. 353.▲
    by drmpeg 7y ago

    Ported to 3.8. https://github.com/drmpeg/gr-paint38
24. 354.▲
    by drmpeg 7y ago

    Stupid GNU Radio tricks. http://www.w6rz.net/spectrumpaint.mp4
25. 355.▲
    by drmpeg 7y ago

    Unfortunately, tvfool is no longer being maintained and doesn't show correct information for post repack channels. An up to date replacement is here. https://www.rabbitears.info/searchmap.php
26. 356.▲
    by drmpeg 7y ago

    It's the second time. First time was in 2009 when the 700 MHz band (channels 52 through 69) was reallocated to mobile.
27. 357.▲
    by drmpeg 7y ago

    Here's a nice resource that shows exactly who's moving and to which channel. https://rabbitears.info/repackchannels.php
28. 358.▲
    by drmpeg 7y ago

    How do you determine if they're harmless? I had a spider bite a couple of weeks ago that gave me a welt the size of a dime (and super itchy).
29. 359.▲
    by drmpeg 7y ago

    Here's a block diagram of my 30 Mbps link. http://www.w6rz.net/ofdm3.png
30. 360.▲
    by drmpeg 7y ago

    Yes. https://en.wikipedia.org/wiki/Ulysses_(spacecraft)