Ringing is in the nature of narrow band pass filters. Ringing "length of
decay" is more a function of bandwidth than that of
skirts.
If you have a 1 Hz bandwidth filter you can't detect pulses spaced less
than 1 second apart. In other words the product of bandwidth and timing
resolution is always greater than 1 or equal to one. This is related
to Heisenberg's Uncertainty Principle.
So with a 1 Hz bandwidth filter you can have 2 seconds of timing resolution
( .5 Hz) or even 1 second (1 Hz) but not .5 seconds (2 Hz) . So if dits are
occurring more frequently than 1 per second you cannot distinguish one from
another. The output from the filter will be a continuous sinusoidal signal.
If the dit rate is less than one Hz or at a period of greater than a
second then they are distinguishable.
73
Bill wa4lav
At 11:27 AM 5/23/2003 -0500, you wrote:
If anything its the other way around. Steeper skirts and squarer
passband corners mean more ringing, and so the Inrad should ring more
than the TT.
73, Jerry, K0CQ
--
Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
Reproduction by permission only.
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