10 Apr
1999
10 Apr
'99
5:30 a.m.
I wrote:
I thought about this for a few minutes. Ignoring rise
and fall times,
for 250 kHz FM, I expect to see spectral peaks at 250 kHz and 500 kHz.
For 500 kHz MFM, I expect to see peaks at 250 kHz, 375 kHz, and 500 kHz.
Oops, I wasn't thinking clearly enough about how the write channel works, so I
was off by a factor of two. That should have been 125 and 250 kHz for the FM
case, and 125, 187.5, and 250 kHz for the MFM case.
Therefore, it seems to me that a channel with
reasonably flat response from
250 kHz to 500 kHz should be able to handle either 250 kHz FM or 500 kHz
^^^^^^^^^^^^^^^^^^
Make that
125 kHz to 250 kHz