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Tuesday, November 24th, 2015
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BCB Carriers 1230z - 2200z at 1490 KHz, 50 Hz BW

Here's a capture over the hours of darkness last night.

All AM broadcast stations are required to stick to within +/- 20 Hz of their assigned carrier frequency. This plot shows about +/- 25 Hz, so most of them are technically within spec, but good grief, I'd be so embarrassed to the the engineer responsible for many of these. There's no good technical reason that (a) stations can't be very accurately on frequency, and (b) stable as a rock.

What a mess, eh? There are more than 50 stations on that plot, quite a few of which aren't stable in any technically serious sense of the word.

The way my software produces this plot is to set a SDR receiver's bandwidth to a very narrow width, and then take an FFT of the received data with a very high resolution. Because that process takes a long time, meaning, lots of samples of the same sets of signals are taken, we get a long term (hours) view of what is going on. It's a fascinating and unique way to look at AM broadcast signals, particularly on BCB channels where many stations are assigned the same frequencies, as is the case here.

#amradio #sdrdx

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