If it's plus/minus 1 minute as some have stated, or plus or minus 1 second, anything within 100 msec. should be plenty.

A decent NTP client will do that running against pool.ntp.org.

Exotic time-keeping doesn't seem to be necessary.

73 -- Lynn

On 9/13/2017 10:36 AM, David Anderson wrote:
Lynn,

For Modes like MSK144 FT8 JT65 you need to be much closer than that!

Better than plus or minus 1 second is required.


73 from David GM4JJJ

On 13 Sep 2017, at 18:22, Lynn W. Taylor, WB6UUT 
<kx...@coldrockshotbrooms..com> wrote:

For what it's worth, plus or minus 30 seconds isn't all that big a deal.




.

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