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Recent content by senmeis

  1. S

    SSR with clicking sound

    Yes, the attached diagram refers to a 2P2T relay. I have found the following description from https://hackaday.com/2017/09/26/an-introduction-to-solid-state-relays/: Due to the internal construction of SSRs, they are only available in a single-pole, single throw (SPST) configuration. Single...
  2. S

    SSR with clicking sound

    Firstly, this is a DC controlled relay. Secondly, I’d like the traditional behavior, that is, the switch can be connected with one pole or the other pole, just like the attached diagram. I suppose all the SSRs can only be connected or not connected so the attached diagram is not possible. Am I...
  3. S

    SSR with clicking sound

    The output is also AC 230V. I only found 1-channel and 3-channel SSRs on the market.
  4. S

    wave guide phased arrays

    Hi, a slide about wave guide phased arrays is attached. Question: Are the magnetic currents fictive ones resulted from the electric field E?
  5. S

    SSR with clicking sound

    I think you’re right. It’s a solid state timer not a solid state relay. Could you please recommend an two channel SSR with 230V AC inputs?
  6. S

    SSR with clicking sound

    Hi, compared with EMR, SSR is well known for its silent contact when activated. I’ve just bought an H3Y-2 from Omron. There is a clicking sound when the timer elapses and the relay is activated but Omron claims it is an SSR. What’s wrong?
  7. S

    reference for the array antenna

    Hi, In the attached picture a standard gain antenna is used as the reference for the array antenna. What kind of antenna is it in general, horn antenna?
  8. S

    phase array antennas with monopoles or dipoles

    OK. That means the array with monopoles doesn’t have radiation in Z direction so the receiver must be somewhere other than Z direction. Is it correct?
  9. S

    phase array antennas with monopoles or dipoles

    Hi, Phase array antennas with monopoles or dipoles can be found in the attachment. Question: why do monopoles lie perpendicular to the plain but dipoles on the plain?
  10. S

    Questions about EMC standards

    Hi, In this presentation https://training.ti.com/system/files/docs/slides-emc_compliance_testing.pdf EMC standards (IEC 61000 and CISPR) are introduced. I have two questions: 1. In IEC 61000 the test frequency goes only to 6 GHz. What about the frequency above? In comparison CISPR goes to 18...
  11. S

    subprocess.call() in Python

    I tried the following two alternatives: Alternative 1: out = subprocess.run(["ffmpeg", "-i", "test.mp4", "test.mp3"], capture_output=True, text=True, shell=True) print(out.stdout) Alternative 2: out = subprocess.check_output(["ffmpeg", "-i", "test.mp4", "test.mp3"], shell=True)...
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    subprocess.call() in Python

    Hi, I want to use subprocess.call(["ffmpeg", "-i", "test.mp4", "test.mp3"]) to make a media conversion. Question: how can I redirect the console output so that this can be outputted with „print()“?
  13. S

    Field Oriented Control vs. I/Q modulation

    Hi, In Field Oriented Control of AC-Motors there are two components: Id (direct current) and Iq (quadrature current). In I/Q Modulations there are also two components: I (in phase) and Q (quadrature). Question: are they somehow compatible with each other?
  14. S

    SINAD vs. SNR

    Hi, I noticed the term SINAD (SIgnal-to-Noise And Distortion) is much less used than SNR. Why? Is distortion included in noise?
  15. S

    12 bits = QAM64?

    Hi, in the attached slide it reads 12 bits are mapped into one QAM64 symbol. Shall it be 8 bits?

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