LF: Re: Divider by 10 or 100 for 136k out

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Subject:	LF: Re: Divider by 10 or 100 for 136k out
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Date:	Sun, 24 Apr 2005 16:01:33 EDT
Delivery-date:	Sun, 24 Apr 2005 21:01:58 +0100
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Dear Hans-Albrecht and Jim,

there is one minor disadvantage in keying a divider: As the phase at each key-down is arbitrary, the transmitted signal looses its inter-symbol coherence. This does not affect normal aural or visual decoding in any manner. But on a high-resolution FFT you will no longer be able to resolve a central spectral line, which would be useful to detect the presence of a very weak signal or precisely measure its frequency.

Of course the same holds true for small keying chirps, as I have recently learned :-(

73 de Markus, DF6NM

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