Ron Hardin wrote:

David wrote:
I thought AM IBOC sounded more like a vaccum cleaner.

Right, it's not IBOC (and it's not power supply noise). It's actual
low frequency modulation on 1190, complementary in each sideband
(so you don't hear it unless you're receiving one sideband only).

I'd doubt you could hear it at night since there are so many other
stations competing for the frequency, unless you're really close.

Whether it's WOWO or not I can't say, but it seems to be most likely,
since it's the only 1190 station really in competition for Central
Ohio in the daytime.

WFAN 660 had the same sort of thing for a couple of months last winter,
only it was a phase modulation introduced by their broken power supply,
inaudible unless you were hearing only one sideband.

This sounds more like a low bandwidth digital subcarrier.

I take it back. It's an on-frequency artifact of IBOC after all.
WCOL 1230 Columbus (or whatever they're calling it now) has the same
deal, a diesel engine idling sound when received either LSB only or USB only
but no sound when both sidebands are received. It has IBOC, and in fact I
spend a fair amount of time nulling its splatter into 1240 away to hear
Zanesville Ohio. That 10 kHz off-channel splatter is the obvious component
of IBOC. I hadn't noticed this on-channel artifact before.

So it's a way to tell who is the IBOC splatter source : who has the diesel engine
sound when received LSB (or USB) only.
--
Ron Hardin


On the internet, nobody knows you're a jerk.