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Re: [HCDX] [UDXF] update on the MHz 'FDM liek beacon'
Hi Zaxarias,
The repeated DTMF in your sample are the numbers: 28322489. It repeats
and does not change in your sample.
Can you get us a waterfall display of the signal? Or a spectral
display? From just hearing it, at first blush, I would have said RFI
until I heard the DTMF. I think there is some sort of switching network
going on near you. I believe it is spurious, given that you are hearing
it from 3-20 MHz, that is, I do not believe it is high-power and is not
intended to be on all the frequencies you receive it on.
Perhaps a USB recording of it at bandwidth might be able to be
displayed/broken down in my Hoka decoder.
Can you advise if the occupied bandwith (or sidebands) are increasing as
you go up in frequency?
73
Al Muick
Whitehall PA USA
On 4/13/2013 10:49, LIAGKAS ZAXARIAS wrote:
Sample of this FDM like 'beacon' can be heard in this audio:
http://www.ipernity.com/doc/zliangas/14722975
with samples from 17 - 15-16 mHz in sequence in one recording first in
AM mode then in SSB mode using DE1103 connected a SW magnetic loop and
recorded into a Creative Zen mp3 player . DTMF tones separate the
three recordings
Today I have checked a little more this "MHz beacon" chain and found
that this beacon can be found on every 200 kHz starting from ca 3MHz
to at least 30 MHz .Stronger carriers can be heard between 7 and 17
mHz . Transmissions stop on 1600 or 1700
If anyone knows something or can listen to it more please let me know
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