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  1. 29. sij

    Have the 5880 0.125 inch laminate on the operating table. The Nomad 883 should be able to cut it like butter.

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  2. 26. sij

    experimenting w/ AD9681 today. Trying to get it up an running, but not sure if it will reliably work at 125MHz with Nexys Video with an Artyx-1 device. Might need dynamic phase adjustment or reducing the ADC sample rate to 80 MHz.

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  3. 16. sij

    I am starting to get too many questions at home regarding the 435 MHz ... What is that on the dining table? Where are you going to put it? Is it ? is my favorite.

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  4. 15. sij

    Does anyone have information on the balun used on these antennas? Looks like a regular 1/4 λ balun plus a folded Marchand balun. Don’t want to have to Dremel the case to see how the lines connect on the other side.

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  5. 5. sij

    Would love to have an IQ recording of the AN/FPS-85 phased array radar at ~442 MHz near Panama City Beach. It is very well positioned to receive passive reflections from my location.

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  6. proslijedio/la je Tweet
    9. pro 2019.

    The latest Solar Cycle 25 forecast has been released: Cycle 25 forecast to peak with a smoothed sunspot number (SSN) of 115 in July, 2025 (+/- 8 months). Cycle 24/25 minimum likely to occur in April, 2020 (+/- 6 months).

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  7. proslijedio/la je Tweet

    We've just posted test results and 4-Dimensional gain plots of the UWB-2 Vivaldi antenna. It performs well from 500 MHz to 11 GHz.

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  8. proslijedio/la je Tweet

    We've just posted test results and 4-Dimensional gain plots of the LPDA-600-X-POL antenna. It performs well from 650 MHz to 3 GHz and doubles as a Christmas tree. Shown with a bottle of scotch for accurate scaling.

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  9. 11. pro 2019.

    front side of the phased array. Only 4/7 antennas. Rest of blades should be here by the weekend.

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  10. 11. pro 2019.

    The simplest form of a beamforming network (boresight beam) 😊 is a ZFSZ-8-43. Happened to have one in my toolbox.

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  11. proslijedio/la je Tweet
    10. pro 2019.

    An update on the current constellation. As of December 5th, all operational satellites from the May launch are at 530 km altitude or are lowering their orbit. 40 of the November satellites are still around 350 km altitude, while 20 continue to climb.

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  12. 10. pro 2019.

    turns out that the dielectric of LMR-500 (0.375”) fits perfectly into frames. This makes great baluns, filters, cavity filters, antennas etc.

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  13. 8. pro 2019.

    I think the 2010 resistors will work fine. They worked ok on the 4x4, but will know next week :)

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  14. 8. pro 2019.

    Had to respin the 435 MHz PCB for the network. The 8-point FFT measures 500 x 400 mm & is probably the fastest FFT in the Southeast. Has phase progressions 0°, ±45°, ±90°, ±135° and 180° w/ 8 simultaneous beams at 0° (broadside), ±14.5°,±30°, ±48.6°, and 90°

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  15. 6. pro 2019.

    Why live a linear polarized life when it could be circular?

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  16. 1. pro 2019.

    Had coupler and air dryer on the back. Shown with its lil brother 8-16 GHz

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  17. 1. pro 2019.

    One of my favorite antenna feeds of all time. A cross polarized square feed by Scientific-Atlanta. Was made in octave bandwidths. This is the 2-4 GHz model.

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  18. 1. pro 2019.

    and 40 kilomegacycle antennas.

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  19. 1. pro 2019.

    The Nomad 883 Pro arrived! Should be able to make quick PCB prototypes now.

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  20. 1. pro 2019.

    Ordered the parts for the miniPAWS 420-450 MHz tracker and radar experiment. Might as well start with 7 panels and then upgrade to 19 or 37. Think the 19 panel version is still manageable. All the parts should be here for Xmas break.

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