[Laser] Re: Lunar Eclipse

[F1AVYopto at aol.com]

Tim

>i am not sure of the exact  parameters of the argo program
>but i think the 10 sec/dots mode is  roughly equivalent to
>the spectran mode operating at 0.084hz bins  resolution.
>Does anyone have the bin sizes or other specs for  the
>different modes of argo?

F1AVYopto at aol.com  wrote:
> Alberto,
> Could I have the bin sizes or other specs for  the
> different modes of ARGO ?
> We need to have these parameters  to compare some signals properties.
> Thanks
> 73 Yves F1AVY   
> 
>  
The Alberto answer :

Hello Yves,
The  current version of Argo has the following parameters :

CW (NDB)  S.  rate 22050 Hz, FFT len = 2048   Bin size (RBW)  = 10.77   Hz
Full Band S. rate 11025 Hz, FFT len = 4096   Bin size  (RBW)  = 2.69   Hz
QRSS3     S. rate   5012 Hz, FFT len = 16384  Bin size (RBW)  = 0.306   Hz
QRSS10    S. rate  5012 Hz, FFT len = 65536  Bin  size (RBW)  = 0.076  Hz
QRSS20    S. rate  5012  Hz, FFT len = 131072 Bin size (RBW)  = 0.038   Hz
QRSS30    S. rate  5012 Hz, FFT len = 262144 Bin size  (RBW)  = 0.019  Hz
QRSS60    S. rate  5012 Hz,  FFT len = 524288 Bin size (RBW)  = 0.0096 Hz
QRSS90    S.  rate  5012 Hz, FFT len = 524288 Bin size (RBW)  = 0.0096  Hz
QRSS120   S. rate  5012 Hz, FFT len = 1048576 Bin size  (RBW) = 0.0048 Hz

The window used is a Hamming window (will change this  in the planned next 
version)
That planned next version will also abandon the  5012 Hz as sampling 
frequency, as modern sound cards do not support  it
anymore. The resolution in the waterfall will be improved by the use of a  
polyphase FFT (as already done in Winrad),
and there will be a substantial  decimation before the FFT.
73  Alberto  I2PHD

>In order  to take advantage of the combined signals, would
>it be better to avoid  using bins smaller than the total
>frequency spread?

It depends the  signal purity.
The smaller the bin, the better the sensitivity and some  details can appears 
like a double spectral lines...

73 Yves.