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.

« previous next »
Pages: [1]

Author Topic: MSQ 353 kHz  (Read 2297 times)

Offline ChrisSmolinski

  • Administrator
  • Marconi Class DXer
  • *****
  • Posts: 31149
    • Westminster, MD USA
    • View Profile
    • Black Cat Systems
MSQ 353 kHz
« on: July 31, 2017, 1748 UTC »
NDB's transmit MCW (Modulated CW). So there is the carrier, plus the two sidebands. Here are three waterfalls made with Carrier Sleuth http://blackcatsystems.com/software/medium_wave_carrier_display_app.html

What's interesting is that one of the NDBs has a very distinctive sawtooth pattern in the carrier frequency. Something is cycling, maybe it is thermal, maybe a misbehaving PLL loop.  You can also see this on the waterfalls 1 kHz below and above, which capture the LSB and USB of the MCW signal. This should be MSQ in Culpepper VA.

You will also notice that the sidebands have not just one signal, but several. This is due to the modulation of the call sign, however I do not believe it is just related to the repetition period, but also the content (dot and dash energy).

But this does give me an idea  ;D

353 kHz (Carrier frequency):


352 kHz (LSB):


354 kHz (USB):
Logged
Chris Smolinski
Westminster, MD
eQSLs appreciated! csmolinski@blackcatsystems.com
netSDR / AFE822x / AirSpy HF+ / KiwiSDR / 900 ft Horz skyloop / 500 ft NE beverage / 250 ft V Beam / 58 ft T2FD / 120 ft T2FD / 400 ft south beverage / 43m, 20m, 10m  dipoles / Crossed Parallel Loop / Discone in a tree

Offline pinto vortando

  • Hero Member
  • *****
  • Posts: 924
    • View Profile
Re: MSQ 353 kHz
« Reply #1 on: July 31, 2017, 2142 UTC »
interesting,  tnx for posting
Logged
Das Radiobunker somewhere in Michigan

Offline jFarley

  • Moderator
  • Marconi Class DXer
  • *****
  • Posts: 5922
    • near Chicago
    • View Profile
    • Email
Re: MSQ 353 kHz
« Reply #2 on: July 31, 2017, 2348 UTC »
Holy Scaramucci, this is cool!
Logged
Joe Farley, Near Chicago
SDR-IQ / R8 / R7
Remote Resonant Loops for HF and LF / ALA 1530
Active 60" Whip / PA0RDT
QSLS appreciated to:    jfarley44@att.net

Offline NJQA

  • Sr. Member
  • ****
  • Posts: 322
    • Virginia
    • View Profile
Re: MSQ 353 kHz
« Reply #3 on: September 04, 2017, 1327 UTC »
MSQ is one of my locals...maybe the strongest at this QTH.  I have long thought that it's spectrum was a bit "dirty", so the extra sideband energy you see doesn't surprise me.
Logged
Pages: [1]
« previous next »