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#14
November 18th 07, 09:29 AM
posted to rec.radio.amateur.antenna
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Low Noise receiving Loop antenna
Owen Duffy wrote:
Owen Duffy wrote in : ... Expected ambient noise level from a lossless antenna in 2kHz at 3.6MHz should be around -82.9+33dBm or -49.9dBm. The 80m loop gain is about - 47dBi, so expected receive level would be -97dBm which is some 40dB above your receiver noise floor. That is wrong, the 82.9dBm was for 2kHz bandwidth, and I should not have added the 33dB bandwidth factor... it is a double count. So the receive level would be -82.9 -47 or -129dBm which would be just 10dB above the receiver noise floor... in the ballpark of what you measured Tony. Sorry for the bum steer. I am still working on a more detailed model, and it will drive the gain figure downwards a bit. Owen you had me worried......... |
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