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Type: Posts; User: senmeis

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  1. Replies
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    Closed: Gain, Sensitivity and Range

    Hi,

    following statement is taken from a document of Keysight spectrum analyzer:

    Finding a preamplifier that will give us better sensitivity without costing us measurement range dictates that...
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    2,292

    Closed: Description of telemetry transmitter

    Hi,

    the following statement is taken from the telemetry standard IRIG Standard 106-11:

    The RF signal is typically generated by filtering the baseband non-return-to-zero-level (NRZ-L) signal and...
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    Closed: channels in GNSS receiver

    156449

    Hi,

    the structure of a general GNSS receiver is attached. Question: can this receiver only process three channels?

    Senmeis
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    Closed: Re: Slat vs. tile arrays

    Sorry, this article is attached.
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    Closed: Scrambler function question

    Hi,

    in some standards such as JESD204B or DVB-S2 a so called scrambler function is defined. As far as I understand this scrambler is a means of spreading spectrum but in data link layer. Is it...
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    Closed: Slat vs. tile arrays

    Hi,

    I’m reading this article https://www.microwavejournal.com/articles/27652-tile-arrays-accelerate-the-evolution-to-next-generation-radar156057 about tile architecture in active phased arrays....
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    Closed: 1dB compression point and jamming signals

    Hi,

    I’ve heard that the 1dB compression point of LNAs can play a role against jamming signals. Shall this 1dB point be higher or lower? Are there any articles about this issue?

    Senmeis
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    Closed: TDMA vs. FDMA in Satcom

    Hi,

    I noticed most of the satcom products are TDMA-based. Can anyone explain what is the advantage over FDMA which is also available on the market?

    Senmeis
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    Closed: Fixed load of wave guide

    Hi,

    how does a fixed load of wave guide (to mitigate reflections) look like, pyramid shape?

    Senmeis
  10. Closed: “curve-fit based” method for III-V devices

    Hi,

    I’ve heard that the commonly used “curve-fit based” method which is valuable for IV-IV semiconductors, is not so accurate for III-V devices such as GaAs. Is this statement correct?

    Senmeis
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    Closed: Re: I/Q data and envelope

    I think the most important characteristic is, the swings between envelopes must disappear. Can this operation support this?
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    Closed: I/Q data and envelope

    Hi,

    How to understand this statement:

    The digital processing computes the root sum of the squares of the I and Q data, which is mathematically equivalent to an envelope detector?

    Does it...
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    Closed: vibration rejection in IMU

    Hi,

    One spec of an IMU is: ±450 deg/s wih high vibration rejection.

    Question: Shall vibration have the unit “deg/s”?

    Senmeis
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    [SOLVED]Closed: Measurement range of signal analyzers

    Hi,

    the following description is taken from a document of signal analyzers:

    A spectrum analyzer with a 24-dB noise figure will have an average displayed noise level of –110 dBm in a 10-kHz...
  15. Closed: Re: GNSS+INS ultra-tightly coupled navigation system

    I asked this question because of this description „accept NCO commands from external sources“ from the attached slide.

    Senmeis
    152510
  16. Closed: GNSS+INS ultra-tightly coupled navigation system

    is it true, in a GNSS+INS ultra-tightly coupled navigation system the GNSS receiver sampling is controlled by INS output?

    Senmeis
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    Closed: Re: Two scale factors in IMU

    I’m not sure if the „scale factor in-run stability“ is related to the case when the IMU stands still. Attached is an example of both parameters. It seems scale factor in-run stability is measured...
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    Closed: Two scale factors in IMU

    Hi,

    an IMU has two parameters:

    scale factor repeatability = 1000 PPM (1-sigma)
    and
    scale factor in-run stability = 250 PPM (1-sigma)

    Question: What is the difference...
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    Closed: Digital phasing in feeds

    Hi,

    in this data sheet http://www.tcs.la/Portals/0/TCSFeedsAndRFTechnology.pdf the terminology „digital phasing“ is refered. How does this digital phasing work exactly? Is DSP required for it?
    ...
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    [SOLVED]Closed: dual axis tracking antennas

    Hi,

    What axes are meant in „dual axis tracking antennas“? Azimuth and elevation? Is there alternative interpretation?

    Senmeis
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    Closed: Re: overhead keyhole question

    In this document it states also:

    Digital demodulation and Autotrack phasing at the controller.

    I think demodulation shall be conducted in a Modem, why controller here?

    Senmeis
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    [SOLVED]Closed: Re: Piezoelectric vs. MEMS accelerometers

    OK, is this understanding correct: PE is better than VC but both can belong to MEMS?

    Senmeis
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    [SOLVED]Closed: Re: Piezoelectric vs. MEMS accelerometers

    Please find the source of this statement in the attachment.

    Senmeis
  24. Replies
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    [SOLVED]Closed: Piezoelectric vs. MEMS accelerometers

    Hi,

    Is it correct that piezoelectric accelerometers generally have higher resolution than MEMS ones?

    Senmeis
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    [SOLVED]Closed: opto for power isolation?

    Hi,

    Can opto isolation only be used for signal isolation or also for power isolation? What about capacitive isolation?

    Senmeis
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