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Re: LF: Op32 day light

To: <[email protected]>
Subject: Re: LF: Op32 day light
From: "Markus Vester" <[email protected]>
Date: Tue, 12 Mar 2013 23:15:34 +0100
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Hi Spiros,
it looks like I'm getting those shifted multiple detections from others (AGC and WPF) as well, so this is very likely a problem here on the receive side. Will have to investigate that in more detail.
Sorry for having cast doubt on the integrity of your signal.
Best 73,
Markus (4X/DF6NM)
Sent: Tuesday, March 12, 2013 4:43 PM
Subject: LF: Op32 day light

Hi Markus –DF6NM.
That is interesting and very starnge.
I am using here the Opera v1.4.7 without sound card and a Lap-Top (HP Pavilion g series).
The same Lap-Top I am using for long time for my JT65b 2m EME qsos, without problems.
I am in cw mode with a 2n2222 transistor keying the YUMA transmitter in CW mode.
My transmitting QRG (dial) is 137.540.
Please let me know what is the reason of this problem.
73 and TNX fro reports.
Sent: Tuesday, March 12, 2013 1:58 PM
Subject: Re: LF: Op32 last night
you'r signal is strong and consistent here in 4X, but interestingly I'm getting multiple detections from different slices of the same transmission. The timestamp shift seems to indicate that the match for the later parts is 20 or 30 seconds delayed compared to the early part. This would mean that either my receiver is too fast, or that your transmitter is too slow by about 1%. In the latter case, I would also expect that the conventional decoder would have difficulties to get a decode.
Perhaps you might want to check the samplerate of the soundcard used for transmitting. You could also try to measure the duration of the Opera sequence - it should be 8.192 seconds per (half-)symbol, or 32min 46sec for the whole sequence.
13:19:20 SV8CS   1437km 137540.091Hz 140mHz -38.9dBOp  78% 18.7dB
13:19:33 SV8CS   1437km 137540.080Hz 154mHz -37.2dBOp  98% 16.2dB
13:19:42 SV8CS   1437km 137540.080Hz 150mHz -38.0dBOp  68% 15.1dB
Sent: Tuesday, March 12, 2013 2:14 PM
Subject: Re: LF: Op32 last night
here you are:
13:19:21 SV8CS   1437km 137540.083Hz 124mHz -38.8dBOp  48% 17.4dB
This was at 13:02, after 48% of the sequence had been received.
Best 73,

Sent: Tuesday, March 12, 2013 11:33 AM
Subject: Re: LF: Op32 last night
Spiros, LF,
several detections of your signal appeared in Northern Israel last night, along with a couple from UA4WPF and RN3AGC. Chris who had been running the software in Bucharest the other night got similar results.
I am currently leaving the receiver on during the daytime, and the noise appears to be quite low. So if you decided to transmit this afternoon there might be a good chance for a daylight detection.
Best 73,
Markus (4X/DF6NM in KM73TD)
   UT    call   distance  frequency bandwidth  SNR    correlation
22:37:17 SV8CS   1437km 137540.006Hz 176mHz -39.0dBOp  90% 19.0dB
00:29:12 UA4WPF  2960km 137541.990Hz   2mHz -45.3dBOp  66% 16.7dB
00:50:36 SV8CS   1437km 137540.046Hz 146mHz -38.8dBOp 100% 20.4dB
02:30:24 SV8CS   1437km 137540.033Hz 159mHz -40.7dBOp 100% 18.7dB
04:10:12 SV8CS   1437km 137540.015Hz 163mHz -37.4dBOp  47% 18.5dB
05:21:24 SV8CS   1437km 137540.007Hz 136mHz -38.0dBOp 100% 19.3dB
06:18:16 RN3AGC  2534km 137557.000Hz   3mHz -50.5dBOp  83% 15.9dB

Sent: Tuesday, March 12, 2013 5:42 AM
Subject: LF: Op32 last night

Captured in Op 32
23:54    136 UA4WPF de SV8CS Op32 3186 km -39 dB in ZAKYNTHOS Isl.
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