But isn't the accuracy and stability of a cheap colour subcarrier xtal,
pulled more than 100ppm from its normal operating point, going to swamp the
values you derive from the 'nice' numbers generated with integer maths ?
Andy
-----Original Message-----
From: John Andrews [mailto:[email protected]]
Sent: 2001-07-31 23:52
To: [email protected]
Subject: LF: Re: SV: LF Receivers
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.
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