Re: LF: VO1NA - Opera32 detections

[Markus Vester <markusvester@aol.com>]

In the past we had some fun with 6 char, 8K19A, 3 s symbols. It decodes fairly quickly and provided sensitivity for regular TA receptions. Of course you don't all have to use the same coding scheme.  

Having the DDS a few milliHz off the whole Hz won't break orthogonality to 1 Hz aligned neighbours. Just make sure that we accurately know the frequency.

Best 73,
Markus

-----Ursprüngliche Mitteilung-----
Von: jcraig <jcraig@mun.ca>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Do, 6. Dez 2018 0:42
Betreff: Re: LF: VO1NA - Opera32 detections

Hi Markus,

I'll take your advice and stay put.  137.5 was a pilot carrier
for EbNaut reception using Spectrum Lab during the pre-NEO 7 era.

The current set up is a uno with a 10 position switch that selects the
32 bit frequency word for the AD9850. Apparently the uno doesn't do 32
bit math so the word has to be determined by other means.  I can move but
not easily at the moment, Jay.  Perhaps the DOCXO/uno/9850 can be replaced
with a NEO 7.

I'll try some phase inversions tonight.  Hopefully the TX, WX and my
memory of how to do this will cooperate.

Please feel free to suggest a coding/polynomial,  Markus.

Paul's little class E is very classy -- much nicer than the one here.

TNX & Best 73
Joe

On Tue, 4 Dec 2018, Markus Vester wrote:

> Hi Joe,
>
> thanks for your fine signals, both on the "77"ies on LF, as well as perfectly persistent on VLF 8270.0075 Hz.
>
> No objections from this end toward EbNaut in the opds band. For us it's comfortable to reuse an already running SpecLab instance with data Export. If you decide for a relatively short message and simple coding, my grabber PC is capable of running an autodecoder instance. Spot on 137500 is not good as there are carriers from Russian Loran (all multiples of 6.25 Hz), and it can also be prone to intermodulation from 60 + 77.5 kHz time signals. Better stick to your 137477 "home" QRG, or perhaps go to one of the unofficial EbNaut gathering spots, e.g. 137490.
>
> Best 73,
> Markus (DF6NM)
>
>
> -----Ursprüngliche Mitteilung-----
> Von: jcraig <jcraig@mun.ca>
> An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
> Verschickt: Di, 4. Dez 2018 17:33
> Betreff: Re: LF: VO1NA - Opera32 detections
>
> Thanks Bernd and Stefan.
>
> Thanks also to Markus for his OPDS work and web site.
>
> The TX is a 50W class E feeding the 100x20m rotated L. The Decca PA is
> taking some time off, following more charred wood and fused halyards...
> quite alarming!
>
> An XOR BPSK modulator module is QRV for some EbNaut.  Is there any
> objection to using 137.5 kHz to send an EbNaut message later this
> week?
>
> 73
> Joe
>
> On Tue, 4 Dec 2018, DK7FC wrote:
>
>> ...and a few from here too:
>>
>> 2018-12-04 07:00:00 VO1NA  4421km 137477.000Hz  2mHz -40.5dBOp  93% 19.3dB
>> 2018-12-04 06:00:00 VO1NA  4421km 137477.000Hz  2mHz -37.2dBOp  93% 19.3dB
>> 2018-12-04 05:00:00 VO1NA  4421km 137477.000Hz  2mHz -34.3dBOp  93% 19.8dB
>> 2018-12-04 04:00:00 VO1NA  4421km 137477.000Hz  4mHz -39.5dBOp  93% 16.8dB
>> 2018-12-04 03:00:00 VO1NA  4421km 137477.000Hz  2mHz -34.3dBOp  93% 19.8dB
>> 2018-12-04 02:00:00 VO1NA  4421km 137477.000Hz  2mHz -33.3dBOp  93% 19.1dB
>> 2018-12-04 01:00:02 VO1NA  4421km 137477.000Hz  2mHz -32.4dBOp  83% 19.6dB
>> 2018-12-04 00:00:00 VO1NA  4421km 137476.999Hz  3mHz -39.3dBOp  93% 18.9dB
>> 2018-12-03 23:00:02 VO1NA  4421km 137477.000Hz  2mHz -36.3dBOp  83% 18.2dB
>> 2018-12-03 21:00:00 VO1NA  4421km 137477.000Hz  2mHz -42.7dBOp  93% 18.4dB
>> 2018-12-03 18:03:56 IK1HGI  449km 137480.000Hz  2mHz -41.2dBOp  81% 17.9dB
>> 2018-12-03 17:29:15 IK1HGI  449km 137480.000Hz  4mHz -41.4dBOp  96% 19.2dB
>> 2018-12-03 16:54:35 IK1HGI  449km 137480.000Hz  4mHz -39.5dBOp  97% 19.1dB
>> 2018-12-03 15:09:40 IK1HGI  449km 137480.000Hz  2mHz -35.2dBOp  94% 20.7dB
>> 2018-12-03 10:08:36 IK1HGI  449km 137480.000Hz  3mHz -43.9dBOp  98% 15.2dB
>> 2018-12-03 03:00:02 VO1NA  4421km 137477.000Hz  2mHz -42.6dBOp  52% 15.7dB
>> 2018-12-03 02:00:02 VO1NA  4421km 137477.000Hz  2mHz -35.5dBOp  52% 18.3dB
>> 2018-12-03 01:00:00 VO1NA  4421km 137477.000Hz  4mHz -41.4dBOp  93% 18.0dB
>>
>> 73, Stefan
>>
>>
>> Am 04.12.2018 08:27, schrieb Bernhard Wiesgickl:
>>> Hello all,
>>>
>>> many detections of VO1NA the last nights at DL0AO:
>>> 2018-12-04 07:00:03 VO1NA  4606km 137477.000Hz  2mHz -41.6dBOp  94%
>>> 17.0dB
>>> 2018-12-04 06:00:01 VO1NA  4606km 137477.000Hz  2mHz -32.0dBOp  82%
>>> 18.3dB
>>> 2018-12-04 05:00:03 VO1NA  4606km 137477.000Hz  2mHz -34.4dBOp  94%
>>> 19.2dB
>>> 2018-12-04 04:00:03 VO1NA  4606km 137477.000Hz  3mHz -46.5dBOp  94%
>>> 16.3dB
>>> 2018-12-04 03:00:03 VO1NA  4606km 137477.000Hz  3mHz -37.3dBOp  94%
>>> 18.2dB
>>> 2018-12-04 02:00:03 VO1NA  4606km 137477.000Hz  3mHz -40.5dBOp  94%
>>> 18.2dB
>>> 2018-12-04 01:00:03 VO1NA  4606km 137477.000Hz  2mHz -38.2dBOp  94%
>>> 18.8dB
>>> 2018-12-04 00:00:03 VO1NA  4606km 137477.000Hz  2mHz -40.1dBOp  94%
>>> 18.6dB
>>> 2018-12-03 22:00:01 VO1NA  4606km 137477.000Hz  4mHz -43.0dBOp  94%
>>> 16.1dB
>>> 2018-12-03 21:00:03 VO1NA  4606km 137477.000Hz  3mHz -43.4dBOp  64%
>>> 16.5dB
>>>
>>> Also nice visible QRSS-Signals during the local morning hours.
>>>
>>> https://lf.u01.de/
>>>
>>> Bernd, DF9RB
>>>
>>>
>>>
>>>
>>
>>
>
>