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Author Topic: Amateur mode 3596 kHz - FSK?  (Read 1686 times)

Offline alleycat

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Amateur mode 3596 kHz - FSK?
« on: July 16, 2021, 0413 UTC »
I'm seeing several frequencies in the 80 meter band with nearly 2 kHz-wide bursts that appear to be some sort of FSK (although none of the sources I'm familiar with, such as SigIdWiki, seem to identify an FSK variant with this wide a bandwidth). Audio clip at https://www.lutins.org/temp/radio/3596.mp3 with waterfall as depicted below. Any ideas? Thanks!
allen lutins - KC2KLC
Binghamton, NY
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Offline CoryD81

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Re: Amateur mode 3596 kHz - FSK?
« Reply #1 on: April 12, 2022, 0042 UTC »
Link to audio not working. Waterfall pics are also a huge help if you're able to get any.

Offline alleycat

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Re: Amateur mode 3596 kHz - FSK?
« Reply #2 on: April 29, 2022, 0209 UTC »
After over 6 months without a reply I deleted the audio file. I had originally included a waterfall image in my post; that too got deleted.
allen lutins - KC2KLC
Binghamton, NY
Yaesu FT-897D, RTL-SDR Blog V3 & SDRPlay RSP1A
G5RV Jr dipole & Grove Omni-II discone
eQSLs welcome: kc2klc@lutins.net

Offline Josh

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Re: Amateur mode 3596 kHz - FSK?
« Reply #3 on: May 04, 2022, 1937 UTC »
I show a few CIS fsk modes with a 2kc shift;
CIS_98.8_2000, 98.8 baud
CIS_100_2000, 100 baud, listed as REA4 Russian AF HQ Moscow
Both listed shifts might be the same modem running different encryption and/or framing, dunno.

Next closest shift in wcode hf table;
BAUDOT F7B, 1550 shift, 250 baud, listed as UKR (Ukraine) FSK encrypted via T207 modem

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