Mehdi

@mehdi0x61

Security Engineer. Car security . Ham Radio (DF2HF , NM9A). SDR

Berlin, Germany
Vrijeme pridruživanja: svibanj 2015.

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  1. proslijedio/la je Tweet
    29. sij

    Posted without comment

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  2. 31. sij

    I don't know if it was a jammer or a local issue with the 's WebSDR receiver but I got this on 20:37 UTC CC

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  3. proslijedio/la je Tweet
    29. sij

    germans: security obsessed, fake facebook name, no twitter, no name in email address also germans: your CV should include a photo, how tall you are, where you were born, and your marital status

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  4. 25. sij

    Here's my 160m HF reception in city centre in an apartment using a MLA-30 (Chinese active magnetic loop) with RSP1A, HF+ Discovery, and Perseus I wonder how it could have been if I had good antenna and noise free QTH

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  5. 24. sij

    Oh really? At least don't use an expired SSL certificate on your linked website :)

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  6. 19. sij

    Does anyone know if these analog delay lines are still used or they are replaced by digital signal processing? (Desoldered them from a VHS recorder)

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  7. 19. sij

    someone said it may be because of LO leakage and Pluto has tricks in its FPGA code to overcome this issue. What do you think?

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  8. 19. sij

    Spotted a strange issue while transmitting on : With a muted microphone, 's output is clean, but LimeSDR Mini's has a constant tone! Both configs and setups are identical. Anyone observed a similar thing? I've posted more info and pics here:

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  9. 18. sij

    I guess I need a bigger dish to be able to exploit its full power

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  10. 18. sij

    Finally tested the UMTS/LTE power amplifier on Initial result: 25W output with ~ 300mW input (~19dB amplification) It draws 10A at 27V. These are originally designed for 2.2GHZ. It can produce even more power but that's enough for now.

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  11. proslijedio/la je Tweet
    14. sij

    One seriously unhelpful aspect of infosec Twitter (that I find myself getting dragged into quite often) is everyone trying to give advice on new vulnerabilities and threats as quickly as possible, based on interpreting incomplete public information.

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  12. proslijedio/la je Tweet
    8. sij

    How infosec works:

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  13. proslijedio/la je Tweet
    7. sij

    The HF spectrum this morning it's full of OTHR HF Radio signals

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  14. 5. sij

    A 2000F-rated fireproof bag exposed to open fire for 20 seconds🙃 Do not rely on positive reviews on Amazon. They are usually happy with the appearance and price and haven't put the product to real world tests

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  15. proslijedio/la je Tweet

    Ok, I have to admit this vs. business just doesn’t sit right with me. Let me @ and pretend to have some meaningful engagement regarding Apple’s larger security dilemma.

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  16. 29. pro 2019.

    Finally managed to have a QSO. Using around 35dBm power and a dual feed antenna from DJ4ZZ my TX was strong and clear. Next step: transmit DATV :)

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  17. 29. pro 2019.

    I should think about a heat sink for my Analog Devices amplifier. Gets hot to around 67 C after 5-10 minutes

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  18. 27. pro 2019.

    Measuring the output of LimeSDR Mini (max drive, SSB @ 2.4GHZ) using RF power meter & GenComm. Immersionrc is useful and accurate enough for cheap portable troubleshooting. Will measure and post the output of my amps and also

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  19. 27. pro 2019.

    Doing a 2-port measurement on 's FM band-stop filter with and GenComm GC747A. M1 and M4: almost the -6dB point M3: the point with the most attenuation (around 106MHZ) Measurements are pretty similar.

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  20. 24. pro 2019.

    Finally I got a proper t&m device (all I got before were entry-level, amateurish) 0-4GHZ spectrum analyser, antenna analyser, power meter, all in one portable package. Thanks to for introducing it, and for help with my questions. Happy Christmas everyone

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