No I didn't, just pure audio filtering. Everything above 5000hz was very distorted by noise. Everything below about 850hz was also distorted by phase noise. I just did a quick and dirty for the voices. The US guy was pretty clear around 1500 hz, high pitched voice.
I didn't hear a side tone, but probably missed it.
I would guess that the US guys were using what they figured was a clear channel and running high power with a directional antenna. Most likely a good ole boys' intercom. Some of the good ole boys' around here run a couple hundred watts, a horizontal yagi, and SSB. Your guess as good as mine. Not enough other data for me to call in an air strike.
The Spanish language might well have been a legitimate FO-29 QSO, we just heard one side of it. Wonder what the orbit foot print looked like at that specific time?
73 Dave
Sent from my iPad
On Jul 24, 2016, at 13:07, Bryan Green bryan@kl7cn.net wrote:
Did you try any noise gate filtering?
-- bag
Bryan KL7CN/W6 bryan@kl7cn.net
On Jul 24, 2016, at 11:04, Dave Mann cwo4mann@comcast.net wrote:
I imported the mp3 file, used filters to zero out anything below 1000hz and above 5000hz, then reduced db gain of 3000 hz center. Copied the results, then re-ran the processed audio with 20db gain. Headphones. I might try running original through my SDR and tinker with outputs.
73 Dave N4CVX
Sent from my iPad
On Jul 24, 2016, at 12:45, Bryan KL7CN bryan@kl7cn.net wrote:
Have been investigating SOX and am very curious about your exact settings and chosen plugins.
Can you elaborate on exactly how you cleaned up the signal?
Thank you!
-- bag
Bryan KL7CN/W6 bryan@kl7cn.net CM98, usually
On Jul 24, 2016, at 10:17, Dave Mann cwo4mann@comcast.net wrote:
Here's my analysis:
-------------------- Audio File Translation ------------------
---- English Language Transmission ----
" ... that's a good boy ... good by calley on it ... it would ... there's too much whining and vox control and {expletive deleted} have to get under it and thats whine ... ah we get by with it .. we can get the weather on it this week ... you know it's copying and {expletive deleted} weekend ... oh lash ..."
---- Spanish Language Transmission ----
" ... y saludos copia cento percento mi faulta commentario KM4MD escuchaio cento percento y otro mentes el lunico KM4MD over, y yo lo creo que tal ... "
Spanish to English Translation - Literal-Colloquial:
" ... And Hello to you, 100% copy but my fault, [missed your comments] comments? KM4MD, over, and yes, that's the truth! What's going on [today]?? ... "
--------------------- End of Analysis ----------------------
Hope this helps, BTW I am an old SIGINTer, both Voice, non-Morse, and Morse Interception. FWIW, this was pretty rough copy for FM. I used an audio processing system on my Linux workstation called "Sox" with various plug-ins. Not like the olden days with an R-390 or the CEI-2000 listening to Soviet Cosmonauts.
73,
Dave N4CVX
On 07/24/2016 11:31 AM, Andrew Glasbrenner wrote: https://www.dropbox.com/s/64571tcoj0y3o2e/FO-29%20QRM%2024JUL16%20ending%201 6-08-15.mp3?dl=0
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