MSQ 353 kHz

[ChrisSmolinski]

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  

353 kHz (Carrier frequency):


352 kHz (LSB):


354 kHz (USB):

[pinto vortando]

interesting,  tnx for posting

[jFarley]

Holy Scaramucci, this is cool!

[NJQA]

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.