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Old 20-11-2018, 22:03   #706
AF4MP
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AIR Bangalore India 7550 kHz reception near Atlanta, Georgia, USA

This afternoon's reception - no audio decoded (but getting close) 15.04 dB max SNR.
Attached Images
File Type: png 7550-181120-1800-2229-Zyg.png (34.8 KB, 77 views)
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Old 21-11-2018, 14:55   #707
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This transmission has awesome coverage.

Attachment 1 shows the coverage at 1900z for this month, and Attachment 2 shows the coverage at 2200z.

The transmitted signal is slewed 20 degrees towards Europe and beyond with a resulting lobe towards Africa and South America.

Yellow is S9 (-103 dBW) and White is S9+20 (-83 dBW) with a 6ft whip receive antenna.
Attached Images
File Type: png AIR 7550 1900z Nov 2018.png (96.1 KB, 85 views)
File Type: png AIR 7550 2200z Nov 2018.png (98.8 KB, 89 views)
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Old 22-11-2018, 20:57   #708
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Nov_22

A result for 129mins. ~70% CDA - 34.9dB max SNR.
Attached Images
File Type: png 7550_181122_1940_mitajohn.png (27.6 KB, 78 views)
File Type: png 7550-181122-1940-2150-mitajohn.png (40.4 KB, 71 views)
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Old 23-11-2018, 22:12   #709
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AIR Bangalore India 7550 kHz reception near Atlanta, Georgia, USA

This afternoon's reception - no audio decoded, 13.08 dB max SNR.
Attached Images
File Type: png 7550-181123-2014-2229-Zyg.png (35.1 KB, 68 views)
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Old 25-11-2018, 22:33   #710
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AIR Bangalore India 7550 kHz reception near Atlanta, Georgia, USA

This afternoon's reception - no audio decoded, 10.13 dB max SNR.
Attached Images
File Type: png 7550-181125-2014-2230-Zyg.png (36.1 KB, 57 views)
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Old 25-11-2018, 22:50   #711
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AIR Bangalore India 7550 kHz KiwiSDR reception near Westminster, Maryland, USA

Meanwhile at a KiwiSDR web receiver 1634 km closer to the transmitter in Maryland USA there was a little audio decoding.

The log is short due to the 30 minute timeout at that receiver site.
Attached Images
File Type: png 7550-181125-2032-2101-Zyg.png (41.4 KB, 69 views)
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Old 26-11-2018, 21:46   #712
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AIR Bangalore India 7550 kHz reception near Atlanta, Georgia, USA

This afternoon's reception - no audio decoded, 12.94 dB max SNR.
Attached Images
File Type: png 7550-181126-1852-2226-Zyg.png (34.9 KB, 63 views)
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Old 28-11-2018, 19:17   #713
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Alright, who's nicked AIR? Not a peep out of them in DRM or AM on 7550 kHz last night and again this evening.

I wasn't sure if it was just propagation that was bad yesterday, but it does now look like the TX is off for some reason.
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Modified NRD-525G with
Radiokit DRM Decoder Board,
SDRplay RSP-1A,
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Lancashire, UK
53:39.18N 02:10.28W
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Old 29-11-2018, 17:13   #714
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AIR is back this evening, though at 1800 UTC it's showing 'Main Channel' and 'Second Channel' again, and interestingly Main Channel is showing 'Chinese Programme' (which it isn't). Well at least it's back on the air again! :-)
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Alan.

Modified NRD-525G with
Radiokit DRM Decoder Board,
SDRplay RSP-1A,
Airspy HF+ Discovery
SDR Console v3

Lancashire, UK
53:39.18N 02:10.28W
IO83vp

https://www.ndblist.info
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Old 29-11-2018, 23:23   #715
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AIR Bangalore India 7550 kHz reception near Atlanta, Georgia, USA

This afternoon's reception - 0.35% audio decoded, 14.47 dB max SNR.

A little better reception this afternoon over this long and difficult radio path.

The received Screen ID is shown in Attachment 2.
Attached Images
File Type: png 7550-181129-1800-2230-Zyg.png (36.9 KB, 67 views)
File Type: png CNR 7550 kHz 29Nov2018.PNG (10.2 KB, 69 views)
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Old 30-11-2018, 19:40   #716
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Everything seems fully back to normal again now, it's showing GOS-IV and RAGAM once again.
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Alan.

Modified NRD-525G with
Radiokit DRM Decoder Board,
SDRplay RSP-1A,
Airspy HF+ Discovery
SDR Console v3

Lancashire, UK
53:39.18N 02:10.28W
IO83vp

https://www.ndblist.info
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Old 30-11-2018, 22:14   #717
AF4MP
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AIR Bangalore India 7550 kHz reception near Atlanta, Georgia, USA

This afternoon's reception - no audio decoded, 11.38 dB max SNR.
Attached Images
File Type: png 7550-181130-1913-2230-Zyg.png (35.8 KB, 48 views)
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Old 01-12-2018, 21:33   #718
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AIR Bangalore India 7550 kHz reception near Atlanta, Georgia, USA

This afternoon's reception - no audio decoded, 11.23 dB max SNR.
Attached Images
File Type: png 7550-181201-2004-2230-Zyg.png (35.7 KB, 50 views)
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Old 03-12-2018, 21:27   #719
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Dec_03

A result for 240mins. 76.7% CDA - 30.5dB max SNR.
Attached Images
File Type: png 7550_181203_1818_mitajohn.png (30.0 KB, 56 views)
File Type: png 7550-181203-1818-2218-mitajohn.png (42.0 KB, 57 views)
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Old 03-12-2018, 22:09   #720
AF4MP
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AIR Bangalore India 7550 kHz reception near Atlanta, Georgia, USA

This afternoon's reception - no audio decoded, 10.95 dB max SNR.
Attached Images
File Type: png 7550-181203-1900-2230-Zyg.png (35.0 KB, 54 views)
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