|Subject:||Re: LF: NA VLF|
|From:||Markus Vester <[email protected]>|
|Date:||Tue, 23 May 2017 12:28:49 -0400|
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D'oh, pity! That message sounded so plausible, and at 0.5 dB EbN0 I wasn't suspecting a false decode.Paul and Markus,
Joe, could you perhaps remind me of your EbNaut timing parameters again? I seem to have missed an email mentioning them.
I don't think that mutual QRM would have been much of a problem. The two signals would be perfectly orthogonal if you used identical symbol timing and chose a carrier frequency spacing which is a multiple of the inverse symbol period (i.e. 0.05 or 0.1 Hz for Stefan's 20 s symbols).
Von: jcraig <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Di, 23. Mai 2017 17:12
Betreff: Re: LF: NA VLF
Thank-you for the encouragement and patience, but infortunately the
message received does not match the one that was sent, assuminmg the
sending was done correctly. Can we try again?
Hopefully I am not causing QRM to Stefan's QTC on 8270.1 Hz. If so I can
QSY back to 8277 Hz! Can we try his suggestion for a daytime attempt to
take advantage of the lower QRN or will the S/N be too low?
Also, are the sigs stable enough? Stefan suggested a GPS module that
could be used with Spec Lab to generate a disciplined carrier. The WX
should be more stable now. Last night the ERP decreased and the phase
probably shifted too.
On Tue, 23 May 2017, Markus Vester wrote:
> Paul and Joe,
> great news! Your patience has finally paid off. Congratulations to both on this excellent piece of work!
> Markus (DF6NM)
> -----Ursprüngliche Mitteilung-----
> Von: Paul Nicholson <[email protected]>
> An: rsgb_lf_group <[email protected]>
> Verschickt: Di, 23. Mai 2017 12:07
> Betreff: Re: LF: NA VLF
> Overnight 22nd/23rd was fairly quiet and the decoder turned up
> at Eb/N0 = +0.5dB, BER 42.7% with constant reference phase,
> peaking at frequency of 8270.0070925 Hz + 6 uHz.
> Rank 7430 in the decoder list.
> Carrier S/N: 12.81 dB in 39.2 uHz,
> -31.26 dB in 1Hz,
> -65.24 dB in 2.5kHz
> Paul Nicholson
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