HFU HF Underground

Loggings => Other => Topic started by: rdla4 on October 04, 2014, 1440 UTC

Title: 17450 WhatzIT?
Post by: rdla4 on October 04, 2014, 1440 UTC

Very broad, each signal slowly increases in amplitude, while it moves up in frequency, then reduces amplitutue.

Very rich 500hz harmonics in the audio passband.

1440 10/4/14

Title: Re: 17450 WhatzIT?
Post by: rdla4 on October 04, 2014, 1444 UTC

The waterfall from this signal:

Title: Re: 17450 WhatzIT?
Post by: Token on October 04, 2014, 1710 UTC

This is a radar, and I am pretty sure it is the SKiYMET meteor radar.  There are multiple sites around the World using this radar or systems derived from / near identical to it.  As near as I can tell there are three primary frequencies used by these radars, 17450 kHz, 29850 kHz, and 35420 kHz.  Other freqs are possible, indeed listed as used, but those are the most common I see at my location.  It looks like the hardware can support up to around 60 MHz operation.

Most radars you see on HF today tend to use FMCW techniques, but this one is a simple shaped pulse (shaped to reduce bandwidth) system.

This PDF contains some information and a map of some of the locations for SKiYMET:
http://spacedynamics.org/capabilities/bearlake/meteor-radar/Mardoc.pdf

T!

Title: Re: 17450 WhatzIT?
Post by: rdla4 on October 04, 2014, 1958 UTC

Excellent information, Thank You!!!

Title: Re: 17450 WhatzIT?
Post by: Matambale on November 16, 2019, 1547 UTC

17540 is quite strong here today, and nearly 60 KHz wide - +10/S9 Nov 16 at 1545Z (Colorado)

Title: Re: 17450 WhatzIT?
Post by: Fried Chickin' on June 22, 2020, 1612 UTC

17450khz here in New Hampshire(https://i.imgur.com/G8tdzlnb.jpg)

Title: Re: 17450 WhatzIT?
Post by: Josh on June 23, 2020, 1750 UTC

SKYNET!?!?!?!

Title: Re: 17450 WhatzIT?
Post by: circuitmike on May 02, 2021, 1835 UTC

Looks like this might be back again. I'm seeing something very similar on 17450 kHz right now (18:34 UTC) in western MA. I've never seen a signal like this before.