[MilCom] Plip Pop

[Steve Douglass]

Thanks to all those who replied. I heard the Plip Plop again just 
after 6:00 PM Local. Again it was very strong with some fading as if 
it was coming from an aircraft with slightly directional antennas and 
it turned away.

On closer listening the signal has a flute-like musical warbling tone 
in in between the Plip Plops.  Signal lasted for twelve minute and 
then abruptly stopped.

I did notice at the the time there was an AWACS in the local pattern 
at the time but don't know if it had anything to do with the Plip 
Plops.

_Steve







>Hi Steve,
>
>I saw the message re having heard a water drip sound on HF.  I have the same
>history of HF captures and no positive ID.  I have heard tell it may be a
>modem of some sort...crypto probably.  You might try listening to the
>various "digital signals" sound samples available online.  Try searching
>keywords "digital sound samples", etc.  I believe the WUN mail list has some
>great support for digital captures.
>
>If nothing else, you may find it handy to download the sound samples and use
>them as "instant" reference.  I'd give you some url's but I just rebuilt my
>PC's and have not redone the cross references I use to link to the pages.
>
>good luck
>
>John Collins
>____________________________________
>----- Original Message -----
>From: "Steve Douglass" <webbfeat at 1s.net>
>To: <milcom at mailman.qth.net>
>Sent: Tuesday, April 13, 2004 8:37 AM
>Subject: [MilCom] Plip Pop
>
>
>>  Intercepting a weird signal on 250.000 MHz that I can only describe
>>  as sounding like water drops ( in rapid succession) plopping into a
>>  pool of water. very strong signal with occasional fading.  Plip pop
>>  plip plip plip plop sound.
>>
>>  Anyone ever hear anything like this before?
>>
>>  -Steve Douglass
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