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My first thought was the ole VFT.. especially on AM sounds a lot like
a squadron of old bombers.

On 8/15/14, Token <t_o_k_e...@hotmail.com> wrote:
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> Your description is not specific enough, there are many signals that can
> sound like that, from digital modems to radars.  At least a frequency and
> mode you used should be included in any such report, however since many
> radars move around in frequency that might be of limited help.
>
> At a guess I would first look at the PLUTO II British radar or the Russian
> 29B6 radar, they both can sound very much like propeller driven aircraft to
>
> some people.
>
> Example of PLUTO here:
> https://www.youtube.com/watch?v=tU6UTZUCvsc
>
> T!
> Mojave Desert, California, USA
>
>
>
> -----Original Message-----
> From: Ashley Dugan
> Sent: Friday, August 15, 2014 8:02 PM
> To: spooks@mailman.qth.net
> Subject: [Spooks] HM01
>
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> this list
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> 08/15/14
>
> HM01 9333 kHz 08:00 UTC
> Tuned in to open carrier then it started at 8.
>
> Newbie question: I always hear a sound like a plane engine running (like a
> propeller plane) on one or two frequencies at night. I've checked sound
> clips on N&O and UDXF, but I can't find it. Can someone tell me what this
> is?
>
> Thanks!
> Ashley Dugan
> Sapulpa, OK
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