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  • Users: Gehr
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  1. Gehr

    Waveguide Internal Surface Roughness

    Thanks MacGyverS2000. Yes frequency sets the skin depth. Please say what percent of surface roughness be of skin depth not to effect the propagation or say a single digit percentage of loss?
  2. Gehr

    Waveguide Internal Surface Roughness

    Hi there! If anyone can clarify the relationship between propagation frequency and internal roughness level of a circular waveguide please? Regards
  3. Gehr

    Marx Generator

    Cerkit dear, you will need a high voltage probe with specifications that your pulse out rise time and duration are not affected by the probe specifications. Then a oscilloscope should be sufficient to do the measurement provided its bandwidth serves pulse parameters. Hope it works, please feel...
  4. Gehr

    Is it possible to determine the location of metal object on an inductor cable

    By using TDR the reflection from first metal object would be significant. What about other objects down the inductor length? Secondly are you interested in the size of the the metal object placed? It will make things a bit complicated.
  5. Gehr

    Pacific Instrument Signal Conditioner

    Hi dear all! I would appreciate if someone who had used or know any Pacific Instruments signal conditioner, if these conditioner accept 4-20mA sensor outputs. I tried to find from their website but was unable. Please do answer, Zahid
  6. Gehr

    Op Amp Trouble 2nd Stage...

    Dear CRThompson, all you require is AC coupling. The DC offset saturates your driven stage. Zahid
  7. Gehr

    Model ship stability

    Mike dear, yes its a modelled scow, built for study purposes. I shall show the hull pictures. I know people in this forum are very good. Zahid
  8. Gehr

    Solenoid valve drive with a PLC

    Why not current amplification?
  9. Gehr

    what benefit using 2 diodes back to back in analog sinals 4- 20 ma

    I totally agree with Burnt2x, the back to back diodes are for protection purposes of the stage being driven. They prevent excessive voltages being developed at the input stage.
  10. Gehr

    What to do from here? (Automation & Controls)

    I would suggest do work voluntarily with people working in control areas at their workshops. Try helping them out in basic areas first and gain practical knowledge in the meantime. Zahid
  11. Gehr

    Model ship stability

    Thanks Strong. I have been doing the experimentation by myself now(previously my boys were involved in it) I noticed that without rudder (to see if it affects) when propulsion is applied at slow speed (wights re-distributed, I place small weights to achieve the draught) zig zag movement converts...
  12. Gehr

    Model ship stability

    Greg dear, thanks for the response. The model is flat belley. I grew a keel after much experimentation when it was not following propeller walk effect with zero rudder. Zig Zag phenomenon occured after introduction of keel. This is what you mean by strakes? I shall post the details very very...
  13. Gehr

    Model ship stability

    Hi! I will be fortunate if I get help from the experts in this forum. I have a model ship designed by myself. Its tug type about 3 feet long and 7 inches wide. Single screw. Made up of composite material. It is Radio Controlled. Without power it moves straight. On power due to propeller walk...
  14. Gehr

    PCI Bus Interface

    Thanks Mac. you almost convinced me. By the way, I donot go to the bars. Thanks dear once again.
  15. Gehr

    PCI Bus Interface

    Mac. dear the argument I have in my support is to have a customized solution for a single channel data input to PC at high rate. I really like USB 3.0 idea and also working on it. But how much is involved in my original requirement?
  16. Gehr

    PCI Bus Interface

    Thanks dear for the respose. Its a customized design. Want to have my own board to be plugged into PCI bus of PC. How to proceed?
  17. Gehr

    PCI Bus Interface

    Hi! I am thinking of re-inventing the wheel. Trying to build my own PCI interface module with a single channel flash type ADC to send data to PC at very high rate. Any suggestions to follow? Thanks in advance. Zahid

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