Re: LF: More EbNaut 137.777

[jcraig@mun.ca]

Impressive.  That's within a decibel of the limit.

The TX power is 30 watts.  Less than 10 should give
valid decodes.

On Fri, 27 Nov 2015, Markus Vester wrote:

>  
> First three decodes tonight:
>  
>    2015 Nov 27/28
> start  Eb/N0  time offset
>  UT      dB    seconds
> 2030     2.2     1.2
> 2100    -0.9     1.2  (after notching QRM)
> 2130     5.7     1.0
>  
> The delay seems to be constant now.
>
> The 21:00 sequence was first not decoded, obviously due to QRM from a lonely QRSS "GH" 
> from UT7GH, only 0.02 Hz below the center frequency of your invisible signal. I then used a text 
> editor to "notch" the QRM by clearing some strong bins in the exported FFT data. After 
> rerunning ifft and ebnaut-rx, I was rewarded by a valid -0.9 dB decode.
>  
> Best 73,
> Markus
>  
> -----Ursprüngliche Mitteilung-----
> Von: jcraig <jcraig@mun.ca>
> An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
> Verschickt: Fr, 27 Nov 2015 8:57 pm
> Betreff: Re: LF: More EbNaut 137.777
> Hi Markus,
>
> My aerial current is 170mA so 3.5 uW on 8.3 kHz!
>
> Nice Eb/No values, Markus.  Getting ready to start EbNaut again, hopefully
> with the timing offset reduced.  Intended start time 2000 UTC.
> CHU weak on 7850 kHz -- hopefully reflex time is good.
>
> 73
> Joe VO1NA