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Re: VLF: Unfamiliar carrier on 8270.007

To: [email protected]
Subject: Re: VLF: Unfamiliar carrier on 8270.007
From: Markus Vester <[email protected]>
Date: Sat, 25 Nov 2017 10:00:21 -0500
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PS: A weak peak appeared again today on the DL0AO western cardioid. I have added another 21 uHz instance, which is using the sum of the two earth antennas to create a NW / SE loop-pattern. This should be better pointed to your direction and improve suppression of nighttime QRN from South America.

Best 73,

-----Ursprüngliche Mitteilung-----
Von: Markus Vester <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Sa, 25. Nov 2017 14:41
Betreff: Re: VLF: Unfamiliar carrier on 8270.007

Hi Joe,
browsing back through Paul's spectrograms, traces on 8270.0075 Hz have been visible in Todmorden more or less every morning between Nov 13 and 24, with most steady SNR on Nov 19, and none on Nov 21.

Since Nov 11th, 21 uHz data from the DL0AO cardioid have been recorded without interruption. In an attempt to bring out your carrier, I have tried to stack several mornings in different combinations, both coherently and incoherently. But results have been inconclusive and don't seem to match Paul's receptions. So far, only a small peak appeared after adding 11th and 12th with opposite phase, which does not seem right.

Now it might help to have a small list of all your recent transmissions, telling us during which nights the carrier has been on air, and whether E-field pickup was used to stabilize the phase, or else when the absolute phase might have changed due to modifications of the antenna tuning circuit.

Best 73,
Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: jcraig <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Fr, 24. Nov 2017 15:08
Betreff: Re: AW: VLF: Unfamiliar carrier on 8270.007

This is remarkable. Is this your first TA reception below 9 kHz on a
spectrogram? The 0600ut enhancments are interesting too.

I've only managed to detect the sigs at 7 km and perhaps at 20 km (on
Signal Hill) using an E-probe and a notepad. 3500km is astounding
and a sure sign that work is needed on my RX methods.

The carrier will continue tonight with EbNaut to follow tomorrow evening.

TNX & 73

On Thu, 23 Nov 2017, Paul Nicholson wrote:

 Yes, look at this from a few days ago,

 and more if you scroll back a day at a time. Note how quite
 frequently the signals comes up very strong at about 06:00
 for half hour or so.

 If you scroll back to the 10th there's Stefan on 8270.005
 but no more sign of your signal. For some reason it's
 started showing up in the spectrogram since about the 13th.

 Paul Nicholson

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