We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissible in your locale.

Author Topic: 17450 WhatzIT?  (Read 3499 times)

rdla4

  • Guest
17450 WhatzIT?
« 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
« Last Edit: October 04, 2014, 1442 UTC by rdla4 »

rdla4

  • Guest
Re: 17450 WhatzIT?
« Reply #1 on: October 04, 2014, 1444 UTC »
The waterfall from this signal:

Offline Token

  • Global Moderator
  • DX Legend
  • *****
  • Posts: 2118
    • View Profile
Re: 17450 WhatzIT?
« Reply #2 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!
T!
Mojave Desert, California USA

rdla4

  • Guest
Re: 17450 WhatzIT?
« Reply #3 on: October 04, 2014, 1958 UTC »
Excellent information, Thank You!!!

Offline Matambale

  • Newbie
  • *
  • Posts: 15
    • View Profile
Re: 17450 WhatzIT?
« Reply #4 on: November 16, 2019, 1547 UTC »
17540 is quite strong here today, and nearly 60 KHz wide - +10/S9 Nov 16 at 1545Z (Colorado)
Littleton CO

Offline Fried Chickin'

  • Full Member
  • ***
  • Posts: 245
  • 42.981404457113206, -70.96033285219448
  • High strangeness in life and on the airwaves...
    • View Profile
    • Email
Re: 17450 WhatzIT?
« Reply #5 on: June 22, 2020, 1612 UTC »
17450khz here in New Hampshire
« Last Edit: June 22, 2020, 1615 UTC by Chickin Little »
L.V.X.

EQSL to hfvoodoo@protonmail.com...73~

Loops & Wires & Love of radio waves...

Offline Josh

  • DXing Phenomena
  • *******
  • Posts: 4322
    • View Profile
Re: 17450 WhatzIT?
« Reply #6 on: June 23, 2020, 1750 UTC »
SKYNET!?!?!?!
We do not encourage any radio operations contrary to regulations.

Offline circuitmike

  • Jr. Member
  • **
  • Posts: 65
    • View Profile
Re: 17450 WhatzIT?
« Reply #7 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.
QTH: Western Massachusetts (FN32rp)
Receiver: KiwiSDR (on-site)
Antenna: Wellbrook ALA-1530LN loop

 

HFUnderground T-Shirt
HFUnderground House Flag
by MitchellTimeDesigns