Hi Martin,
I see Alan has responded to the second part of your question.
I will respond to the first part regarding the antenna factor. In transmission path there are two
chains - transmit antenna - free space -receiving antenna and receiving antenna - receiver input.
There are two matching loss factors for both mentioned chains. In antenna factor is included
Mismatch factor from 377 ohms to 50 ohms providing that the impedance of your antenna is
50 ohms. Duffy¡¯s calculator allows to change this impedance to other value. The second mismatch factor is between receiving antenna and receiver
Input.
Alan wrote that I mentioned passive matching between antenna and receiver input where the matching bandwidth is a couple percentage of needed broadband application.
Unfortunately, he knows only first order L matching technique. What about using band pass filters of higher order, or lettuce type filters?
Is he at least familiar with our member ¡®s work by Chris Trask ? Yes, it easy to shoot from the shoulder not investigating everything that is reachable regarding this topic of discussions.
Raphael
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26 §à§Ü§ä. 2022 §Ô., §Ó 9:47 AM, Raphael Wasserman via groups.io <wassermanr46@...> §ß§Ñ§á§Ú§ã§Ñ§Ý(§Ñ):
?Alan,
Best¡¯s work was published in 2016 and I do not consider electrodynamics laws old fashioned.
Technologies could be new and advanced but physics theories stay the same regardless how you would slice the issues.
I see you in favor of active small loop antenna.
Would you be kind to provide me complete
Calculation scheme of active antenna not missing there broadband matching and SNR for bandwidth 30 MHz not throwing just a schematic diagram with identified components on it ?
Regards,
Raphael
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26 §à§Ü§ä. 2022 §Ô., §Ó 9:22 AM, John KN5L <john@...> §ß§Ñ§á§Ú§ã§Ñ§Ý(§Ñ):
?Hi Martin,
EZNEC exports a Source impedance, R and X, file, LastZ.txt. SimSmith can
use LastZ.txt file for matching solutions.
System gain, or loss, is a combined EZNEC and SimSmith.
John KN5L
On 10/26/22 4:53 AM, Martin via groups.io wrote:
Another issue that has puzzled me is that, if you model an antenna with
something like EZNEC and derive gain figures, does this factor in
mismatch loss or do you need to calculate this separately ?
