Saturday, July 14, 2012

China Radio International bit of a bandwidth hog

And by bandwidth, I mean spectrum.

I've noticed this for a while, but didn't find much mention of it from Google, besides a couple German forum threads [1][2].

Basically, China Radio International, as relayed via Cerrik Albania, uses 20 kHz of bandwidth, double sideband.


This is from the English broadcast, at 9570 kHz. At +/- 5 kHz there what look like carriers, likely corresponding to Radio Tupi (Brazil) and Radio Mediterranee International (Morocco), respectively. Any attempt at improved audio quality is thus defeated, with the carriers manifesting as annoying 5 kHz whistles.

Also, not all shortwave receivers can do 20 kHz demod. So what's the point? It seems kind of asinine.

At the same time, CRI is going strong on 6020 kHz, and here the clobbering of other stations is much more apparent.


At 6030 kHz is Radio Marti (USA). I guess the Chinese are doing the Cubans a favour by clobbering it?

I wish I had saved the spectrum from when CRI was relayed via Sackville Canada, but Sackville no longer relays CRI and barring a miracle, will be shut down entirely.

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