John: This article and subsequent comments explains the differences:
<http://www.tentecwiki.org/doku.php?id=563upgrade>
Re. your main question:
/The later 564's replaced the crystal oven with a 2ppm TCXO on the logic
board, probably the best enhancement TT did to this radio. The crystal
oven eventually "cooks out" and will not hold frequency tolerances well.
Try aligning one and getting it to hold frequency. The TXCO fixes that
problem.//
/
Hope this helps!
--Peter, KD7MW
On 7/12/2016 4:13 PM, John King via TenTec wrote:
Does the early Omni VI (1992-1993) and The Omni VI opt.3 have the sane TCXO?
What are the main differences between the two? Thanks, John, K5PGW
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