[hpsdr] exact frequency determination

[John Marvin]

Vasiliy,

I know you are joking, since I know that you also "compete" in the FMT 
contests, and in fact came in 4th place in the April 2013 FMT (great 
job!). So you know that top contenders can easily get within 30-40 mHz 
for most of their measurements, but we occasionally get it right on. The 
ARRL FMT contests are judged to the nearest 10 mHz. K5CM's "practice" 
FMT's are judged to the nearest 1 mHz. Every once in a while we either 
get lucky or ionospheric conditions are extremely favorable leading to 
more precise results.

Anyway, the maximum error caused by the phase word computation 
truncation can be close to 30 mHz, which would be a significant source 
of error if not taken into account. Why not reduce that to 0 so we don't 
have to worry about it and can concentrate on the parts we don't have 
much control of, like reading the tea leaves, uh I mean reading the fft 
peak chart over the duration of the FMT run and trying to determine 
which values to throw out and which to keep.

Regards,

John
AC0ZG

On 11/20/2013 6:49 PM, k3it wrote:
> Sounds like Brian is getting ready to obliterate competition in the 
> ARR FMT test ;). A single digit millihertz accuracy will certainly 
> place you at the top of the charts for quite some time.
>
> -- 
> 73 Vasiliy K3IT
>
>


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