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Re: Steve ugly-build LZ1AQ using MPS2222 sweeps uploaded to Photos


 

Hi Mark,
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I reviewed your response:
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1. The introduced two isolation resistors 1 Kohms each cannot be considered as a part of dummy aerial because any dummy aerial equivalent circuit should include only real antenna lumped element values ( that is the ABC of design concept of dummy aerials ).
2. There is a misconception between dummy aerials and simulation models.
3. In simulation model for a small loop antenna, especially for short current application mode, none has introduced an acceptable layout of it.
4. The simulation model should be built based on the published known equation of voltage divider consisting of two arms - lumped inductance of antenna and resistive input of amplifier and applied induced voltage, based on Faraday's law. The practical difficulty to construct such simulator is the induced voltage is linearly proportional to the frequency.
?However, the physical simulators have been? published here do not take into consideration the mentioned above condition. Simply those simulators do not have a control mechanism, allowing the applied voltage from generator source to follow the frequency change accordingly.
On other hand dummy aerials have been used only for measurement of frequency responses, allowing to apply from signal generator constant values with frequency changes of interest.?
In my opinion, for simulation of antenna systems would be better to use current induced method, like Martin proposed, with two coupled together in near-field loop antennae with one important condition for an improvement for this technique - the current in the transmit antenna shall be controlled with frequency be almost constant
in value.?
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Regards,
Raphael
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