From: owner-ammf-digest@smoe.org (alt.music.moxy-fruvous digest) To: ammf-digest@smoe.org Subject: alt.music.moxy-fruvous digest V14 #5123 Reply-To: ammf@fruvous.com Sender: owner-ammf-digest@smoe.org Errors-To: owner-ammf-digest@smoe.org Precedence: bulk alt.music.moxy-fruvous digest Thursday, October 15 2020 Volume 14 : Number 5123 Today's Subjects: ----------------- iHeadphones are earbuds that make your ears and your wallet happy. ["Affo] ---------------------------------------------------------------------- Date: Thu, 15 Oct 2020 09:20:17 -0400 From: "Affordable for Everyone" Subject: iHeadphones are earbuds that make your ears and your wallet happy. iHeadphones are earbuds that make your ears and your wallet happy. http://iheadphones.buzz/cw29K1H2nOEfdM6gUvSJT2OqANp7yFaUjHH4gsTj9ooX59Q0 http://iheadphones.buzz/h78WH4c49Yudmrz5TR1FPcWukVUjBCxscik4Tg_4fYDdQS0_ Reflected signals decline rapidly as distance increases, so noise introduces a radar range limitation. The noise floor and signal to noise ratio are two different measures of performance that affect range performance. Reflectors that are too far away produce too little signal to exceed the noise floor and cannot be detected. Detection requires a signal that exceeds the noise floor by at least the signal to noise ratio. Noise typically appears as random variations superimposed on the desired echo signal received in the radar receiver. The lower the power of the desired signal, the more difficult it is to discern it from the noise. Noise figure is a measure of the noise produced by a receiver compared to an ideal receiver, and this needs to be minimized. Shot noise is produced by electrons in transit across a discontinuity, which occurs in all detectors. Shot noise is the dominant source in most receivers. There will also be flicker noise caused by electron transit through amplification devices, which is reduced using heterodyne amplification. Another reason for heterodyne processing is that for fixed fractional bandwidth, the instantaneous bandwidth increases linearly in frequency. This allows improved range resolution. The one notable exception to heterodyne (downconversion) radar systems is ultra-wideband radar. Here a single cycle, or transient wave, is used similar to UWB communications, see List of UWB channels. ------------------------------ End of alt.music.moxy-fruvous digest V14 #5123 **********************************************