LF: VO1NA and UA4WPF detected in Nuernberg

["Markus Vester" <markusvester@aol.com>]

Attached colour spectrogram is a collation of the last night's TA grabber screenshots, with Joe's transmission producing several bright blue traces.

 

Unfortunately the keying at VO1NA does not seem to be phase coherent, and a narrow spectrogram shows blurry traces without a central line. Thus the sensitive coherent correlation method could not be employed. I then tried to correlate just the power of the signal in 0.125 Hz bandwidth, which is somewhat similar to what standard Opera software would do. This produced five detections, with start times at 22:53, 23:26, 1:06, 2:46 (weak) and 4:26 UT.

 

Between 1:00 and 1:20 UT, we can see another weak red trace above VO1NA. This showed up as a dash at 137777.3045 Hz in my 438 microHz spectrogram, and appeared to be a part of a yet unidentified Op32 signal. Fieldstrength was only about 0.1 uV/m, and SNR -50 dB on the Opera scale. As the signal was coming from the east and was visible on the RN3AGC grabber, I tried to correlate it against different Russian callsigns. Finally the sequence for UA4WPF produced an unambiguous hit, proving a detection at 2833 km.

 

Best 73,

Markus (DF6NM in JN59NJ)

 

 

From: jcraig@mun.ca

Sent: Sunday, September 02, 2012 2:19 AM

To: Graham

Cc: rsgb_lf_group@blacksheep.org

Subject: Re: LF: VO1NA

Graham, Group,

Absolutely delighted!  Many thanks for the help and report.
Martin also sent a capture of the sigs from last night which was also very gratifying.

It seems to be set up to TX opera32 every hour now and working properly so it will not be touched until dawn tomorrow.

Many thanks for the good news and to those who took the time to monitor!
73
Joe

On Sun, 2 Sep 2012, Graham wrote:

> looks  like  a good  start to the  night
>
> G..
>
> 23:26    136 VO1NA de GW0EZY Op32  -34 dB in Welshpool IO82HO
> 23:26    136 VO1NA de G4WGT Op32  -37 dB in Chorley, IO83qo
>
> 23:59    136 VO1NA de F4DTL Op32  -40 dB in Paris France
> 23:59    136 VO1NA de W1TAG Op32  -41 dB in Raymond, ME
> 23:59    136 VO1NA de GW0EZY Op32  -32 dB in Welshpool IO82HO
> 23:59    136 VO1NA de G4WGT Op32  -31 dB in Chorley, IO83qo
>

UA4WPF_correlation_120902.png
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VO1NA_powercorrelation_120902.png
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df6nm_TA_120901-02.jpg
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