* On 2020 03 Apr 04:16 -0500, G.W. Haywood wrote: > Hi there, > > On Thu, 2 Apr 2020, Martin McCormick wrote: > > > My thanks to all those who theorise that it was this particular > > drive's time to die. It is several years old and I was thinking > > along the lines that the rest of you were thinking. One thing I > > haven't done yet is to see if the clock crystal that drives the > > internal usb controller is still active. I am not sure what > > frequency it should free run on but one can sometimes hear the > > clock on a general-coverage short wave radio receiver or > > scanner-type receiver. > > > > What one hears is a signal that usually sounds like a > > continuous carrier with no modulation. It's there when the drive > > is powered up and goes away when the drive is disconnected. > > > > > > Thanks. > > > > Martin > > WB5AGZ > > Come on WB5AGZ, you know better than that. You can't hear a > continuous carrier with no modulation. You can only hear the result > of mixing it with something. :) In an FM receiver it can become "full quieting" if it is strong enough. True, the carrier won't be heard but the effect of a very low background noise level when the carrier is strong enough to be clipped by the limiter is audible. To me FM was one of the great technical achievements of the 20th Century. Too bad Maj. Armstrong didn't live to see it fully embraced. FM is a tragedy with many parts. - Nate -- "The optimist proclaims that we live in the best of all possible worlds. The pessimist fears this is true." Web: https://www.n0nb.us Projects: https://github.com/N0NB GPG fingerprint: 82D6 4F6B 0E67 CD41 F689 BBA6 FB2C 5130 D55A 8819
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