[time-nuts] More Allan deviation data
Didier Juges
didier at cox.net
Sun Oct 29 07:41:21 EST 2006
I had to stack up frequency counters on top of frequency counters (to
measure time difference and each input frequency simultaneously -> 3
counters) and the last one on the top, a HP 5334B, was fairly high and
just about level with the antenna, about 2 feet away. I found out that
if I stood in line with the antenna and the counter, my shadow would
significantly affect the cleanliness of the 1 PPS, so I moved the
antenna just under the ceiling and the problem went away.
Amazing!
Didier
Rob Kimberley wrote:
> Interesting to know what obstructions you cleared by moving it higher. May
> have been getting some multipath from something on the antenna's apparent
> horizon.
>
> Rob K
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