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  • Users: JBE
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  1. JBE

    500 kHz-500 MHz current transformer

    Although I have not field experience, I do not think that the Permalloy nickel/iron alloy would work in the considered bandwidth (0.5- 520 MHz). Am I wrong? Any reference about the nanocrystaline and amorphous cobalt based materials? Thanks
  2. JBE

    500 kHz-500 MHz current transformer

    I set up a PCB for testing different materials. I have already tested several powered iron cores and ferrites that we have available. I have ordered some other materials. I have been trying to get samples from the company manufacturing the convenient for current transformers nanocrystaline...
  3. JBE

    500 kHz-500 MHz current transformer

    Would be a single amorphous cobalt based core able to cover the requested bandwidth (500 kHz-520 MHz? What about the nanocrystaline Vitroperm 500F? Please let me know
  4. JBE

    500 kHz-500 MHz current transformer

    It is trying to be an ideal linear sample, to measure the primery current phase and a multiple of its magnitude. May you please be more specific about your "Ur" suggestion? What about my question about the low permeability at UHF frequencies vs. current measurement accuarcy? Thanks
  5. JBE

    500 kHz-500 MHz current transformer

    I am designing a current transformer that maybe cannot be done using a single core without switching. I am considering a single- turn primary winding with the secondary winding loaded with a low resistance. I request some advice regarding its design. I have references indicating that in order...
  6. JBE

    RF ground planes layout

    Alba, yes I keep on being interested in this subject. I believe that your "ground playing around" experience would be welcome.
  7. JBE

    RF SWITCH SPST ?

    Have you read "Modern Definition of Terms" in http://www.minicircuits.com/appnote/sw13-2.pdf ? I guess that you will understand better "your switch"
  8. JBE

    RF ground planes layout

    May somebody provide me with any theoretical-practical application note (articles, web pages ...) regarding RF ground planes layout (up to 1.2 GHz)? I certainly know about the characteristic PCB layout guidelines. A continuous ground plane on the back side of a printed circuit board as an...
  9. JBE

    AM low voltage varactors

    Thank you, I found other AM varactors sources (TH: 1SV102, 1SV149, SMD: HN1V01H,HN1V02H and HN2V02H) from Toshiba. Although I ignore how commonly used aret these parts in the industry. I got references for Knox semiconductor tuning diodes too, although the SMV1405 reaches barely 350 pF in the...
  10. JBE

    AM low voltage varactors

    I am working in a design that requires a low voltage varactor as the one used in AM tuning applications. A 5V tuning voltage could be provided. Ideally the diode should go from 47 pF up to above 500 pF. I found a couple Sanyo varactor diodes that probably could perform that task. These would...
  11. JBE

    Signal Synthesizer SSB Phase Noise measurement using an old S. Anal.

    I have available an old HP Spectrum Analyzer. Tuning frequency, Bandwidth, Scan Width and Input Attenuation controls are available on the HP 8554L RF section. The IF HP 8552B section provides bandwidth/gain selection and detection. I would like to determine the SSB Phase Noise of a signal...

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