[time-nuts] Performance of the Thunderbolt self-survey / antennas

[bg at lysator.liu.se]

Bill,

It might be a set of cake pans... ;-)

--

   Björn

> Mark,
>
> Is that thin or deep pan ?
>
> Bill....WB6BNQ
>
>
> Mark Sims wrote:
>
>> Now that I have a precise spot (+/- 4cm) known on my front deck I set up
>> a tripod and did numerous 1400 point self-surveys with a Thunderbolt.
>> This spot is surrounded by very tall trees and multipath from the trees,
>>  steel gates and stucco walls,  a house,  an iron fence, etc.  I used
>> four different antennas:
>>
>> 1) A Sokkia geodetic grade L1/L2 antenna
>> 2) A Aero survey grade L1 only antenna
>> 3) A Datum timing antenna
>> 4) A cheap patch antenna
>>
>> I could not find any repeatable differences in the performance of any of
>> the antennas.  The $3000+ geodetic grade antenna performed no better
>> than the cheap $5 dollar patch antenna.
>>
>> Composite performance over 22 runs was:
>> Avg lat error: 1.4 feet,  std dev 4.48 feet
>> Avg lon error: 2.24 feet,  std dev 2.87 feet
>> Avg alt error: 6.00 feet,  std dev 15 feet
>>
>> Although I did not do any extended timing tests between the antennas,
>> the numbers that I did see make me suspect that timing performance among
>> the antennas would be similar.  A couple of 24 hour runs between the
>> cheap patch and the geodetic antenna were the same.  A cheapskate could
>> probably get excellent results by mounting a cheap patch antenna in the
>> middle of a large pizza pan ground plane.
>>
>> _________________________________________________________________
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