[time-nuts] Thunderbolt reception problems

John Green wpxs472 at gmail.com
Tue Nov 24 15:45:55 UTC 2009


I have been following the discussion regarding Tbolt performance closely. I
have 2 of them and have not seen performance even close to what others
report. I don't seem to have sensitivity related issues that others have
reported. I am feeding Tbolt and Z3801 from a common antenna through a
purpose made GPS splitter. The Tbolt seems to see more sats quicker than the
Z3801. The Tbolts I have are extremely temperature sensitive. Even putting
them in a box to shield them from room temperature variations, they seem to
wander around a lot. This sounds crazy and is not in line with what others
have reported but when I changed the TC to 500 seconds, mine got a lot
worse. I found that a TC of around 10 seconds with a damping of 1 made for
the least amount of phase slip compared to a Z3801.


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