Recent content by _maxim_

  1. _maxim_

    Alternatives to creeping contacts for high frequencies

    Thank you Tom, I need some time to read the documentation and to start with some trials.
  2. _maxim_

    Alternatives to creeping contacts for high frequencies

    Dear Baluncore The diagram in post #26 is a very basic thank circuit. If the coil L does not move in the magnetic field (with its sample inside), only one thank RF circuit is required. If the coil L moves from one position to another experiencing a different magnetic field, as in my case, a...
  3. _maxim_

    Alternatives to creeping contacts for high frequencies

    I want to thank you for giving me the opportunity to clarify some aspects: Never talked about horizontal movements. I talked ONLY about movement along the magnet axis, which is VERTICAL. ??? The coil (or resonator) is a part of the probe, it is inside the probe. By probe we mean the device in...
  4. _maxim_

    Alternatives to creeping contacts for high frequencies

    I did not refuse the idea of using sliding contacts, simply I have no idea on how to implement that on my project... Can you share with me some papers about sliding contacts? Think that the coil/resonator will move by at least 50-80 cm from one side to the opposite side in the magnetic field...
  5. _maxim_

    Alternatives to creeping contacts for high frequencies

    Every frequency at which the RLC circuit resonate (coil/resonator + selected tank filter Ct+Cm) is interesting to detect. Obviously it is unthinkable to read them all, I would just read only 4 or 5, from the highest (700-800 MHz) to the lowest (1-30 MHz), stepped.
  6. _maxim_

    Alternatives to creeping contacts for high frequencies

    Thank you for your comments but for the purposes of defining the problem it makes no sense to describe all the devices involved in the project. To make this discussion productive, it is sufficient to focus on the type of problem posed: how to make an efficient electrical connection given the...
  7. _maxim_

    Alternatives to creeping contacts for high frequencies

    18 MHz is an intermediate frequency which is used for subsequent elaboration of signal. The response picked up by the coil is the same of the frequency transmitter (that's why resonance). I see Thank you again, Tom!
  8. _maxim_

    Alternatives to creeping contacts for high frequencies

    Thank you Tom. About the Analog Switches, I think the main problem arises from the frequency: can 850 MHz @ tens of watts be handled ? Frequencies and powers delivered are in the range of radio/antenna applications... T/R switches are interesting... I will have a look around. Do you mean can I...
  9. _maxim_

    Alternatives to creeping contacts for high frequencies

    I just need a way to connect the coil to several RLC circuits which resonate at different residencies.
  10. _maxim_

    Alternatives to creeping contacts for high frequencies

    No no.. As I wrote, the schematic and the receiving stage is something like what I have, it is a very simplified version of my instrument. But the principle is the same.
  11. _maxim_

    Alternatives to creeping contacts for high frequencies

    The receiver is something like the following: http://www.conspiracyoflight.com/NMR/NMR.html
  12. _maxim_

    Alternatives to creeping contacts for high frequencies

    It looks like I can only use capacitors, as in the following general circuit Either the Matching Capacitor and the Tuning Capacitor are elements which I must select depending on the Frequency range. The L is the coil which moves in the magnetic field which must be connected with different Cm/Ct...
  13. _maxim_

    Alternatives to creeping contacts for high frequencies

    No, it can not be realized in such way: coils as in transformers generate magnetic fields which interact with the static field to be measured. The coil must be connected electrically with the RF circuits.
  14. _maxim_

    Alternatives to creeping contacts for high frequencies

    Ah ah sorry you're right.... Just corrected, my keyboard has been faster than my mind. Hope nobody considered offensive the mistyped
  15. _maxim_

    Alternatives to creeping contacts for high frequencies

    I anticipate immediately that I am not sure if this is the right place to ask my question, in case I had made a mistake I would migrate willingly into the relevant area. I have an RF circuit on small PCB board (about 3x2 cm) that moves along a vertical axis in a measuring probe (it serves...
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