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Yes the "new" Alpha Fx frequency does fit the
supposed pattern; the central peak is exactly at Fx = 12695.3125 Hz.
On the F2 frequency, the central line happens to be
notched at this location, due to coincidental antiphase superposition of dashes
from the three transmitters.
Best 73,
Markus
Sent: Monday, December 03, 2012 6:48 PM
Subject: Re: LF: Something different
Roelof,
ah, yes, I had
overlooked that Trond had already mentioned Fx = 12.700 kHz.
According to your measurement, and in analogy to F4 but with F0
replaced by the alternate 781.25, this one should probably be
Fx = 260/16 *
781.25 Hz = 12695.3125 Hz
Will try to
check it in a narrow spectrogram when I get home.
Best 73,
MArkus
-----Ursprüngliche
Mitteilung----- Von: Roelof Bakker < [email protected]> An:
rsgb_lf_group < [email protected]> Verschickt: Mo, 3 Dez 2012
4:26 pm Betreff: Re: LF: Something different
Hello Markus,
I can hear now:
11.905 kHz, 12.500 Khz, 12.649 kHz, 12.695 kHz, 13.281 kHz, 14.881 kHz and
15.625 kHz.
So there are now 7 stations active.
12.695 kHz is not mentioned in Trond's description, but 12.700 kHz is.
So, I assume that this is probably the same station and it operates in
conjunction with the secondary frequency set.
All other frequencies are accurate to the Hz, so 12.695 is that as well.
I guess you are aiming for more precision?
73,
Roelof Bakker, pa0rdt
-----Ursprüngliche Mitteilung-----
Von: Markus Vester
<[email protected]>
An: rsgb_lf_group
<[email protected]>
Verschickt: Mo, 3 Dez 2012 12:16
pm
Betreff: Re: LF: Something different
... actually you seem to have found a new one on 12.70 kHz
which has not been listed
before. Would be interesting to measure this frequency exactly and try to
deduce a common divider.
73, Markus
-----Ursprüngliche Mitteilung----- Von: Markus Vester < [email protected]> An:
rsgb_lf_group < [email protected]> Verschickt:
Mo, 3 Dez 2012 11:45 am Betreff: Re: LF: Something different
Hi Roelof,
thanks for the
hint. This must be their alternate frequency set, as mentioned in Trond's
article
The extra traces
are nicely visible, eg on Lubos' VLF Grabber
Best 73,
Markus
(DF6NM)
-----Ursprüngliche Mitteilung----- Von: Roelof Bakker < [email protected]> An:
rsgb_lf_group < [email protected]> Verschickt:
Mo, 3 Dez 2012 11:19 am Betreff: LF: Something different
Hello all,
This morning the Russian hyperbolic positiion system Alpha is transmitting
on three extra frequencies.
See attached screenshot.
73,
Roelof Bakker, pa0rdt
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