LF: Re: SV: LF Receivers

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LF: Re: SV: LF Receivers

from [John Andrews]

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To:	[email protected]
Subject:	LF: Re: SV: LF Receivers
From:	"John Andrews" <[email protected]>
Date:	Tue, 31 Jul 2001 18:52:21 -0400
References:	<002201c119fe$589f3160$e10a97d4@oemcomputer>
Reply-to:	[email protected]
Sender:	<[email protected]>

Johan,

Another interesting clock frequency for 32 bit DDS chips is 3579.13941...
kHz, one third the frequency you mentioned. It is easily "pullable" from a
common 3579.545 kHz color burst crystal. While it yields tuning steps of the
oddball value of 0.8333... mHz, it allows integer math to 10 mHz resolution,
which is sufficient for most LF work.  I am currently building an LF exciter
based on this setup, using an AD9850 DDS chip.

John Andrews, W1TAG

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