Re: [IRCA] Stopping HD Radio

["Karl J. Zuk" <karlzuk@xxxxxxxxxxx>]

Barry

"the digital sidebands of adjacent channel
do not overlap," ????

Where do you live? We would all like to know!
We would love to hear silence!

You should hear what three layers of digital hash sound 
like when they mix and phase together. 
It sounds like a large train coming through your radio!
Visit the east coast of America. You'll see what we mean. 

Digital often pummels digital! And analog! And us!

AM Stereo

NRSC 10 kHz filters

"Expanded" band

Compatible single sideband

"Super" audio processing - Optimod AM and SW

IBOC

The IRCA has survived it all!



Karl Zuk  N2KZ





> From: bdm@xxxxxxxxxx
> To: irca@xxxxxxxxxxxxxxxx
> Date: Thu, 27 Sep 2007 20:24:52 -0400
> Subject: Re: [IRCA] Stopping HD Radio
> 
> On Thursday 27 September 2007 10:13, Powell E. Way III W4OPW wrote:
> > Well stations aren't broadcasting FOR your DX'ing
> > pleasure. Skywave was  / is there and won't go away.
> > It can also be an aggravation close in to the station
> > because of groundwave / skywave cancellation.  I don't
> > care for HD as it really is an outdated and data bit
> > starved / reduced mode, and even under perfect
> > condtions it isn't as good as analog. Right now power
> > levels are 1% of analog, but with the modulation cycle
> > even wiith no audio is 100%. That's why it creates
> > such a mess. The laughable thing is on the
> > clears...the adjacents IBOC prevents each others IBOC
> > from decoding at night. I guess THAT is poetic
> > justice.
> 
> That's not quite right - the digital sidebands of adjacent channel
> do not overlap, so it is not IBOC killing IBOC.  IBOC stations will have
> lousy digital coverage at night regardless of whether their adjacent
> channel neighbors are running IBOC at night or not, because it is the adjacent
> channel analog signals that are killing the digital sidebands.  OTOH, it's the
> analog coverage that gets degraded by IBOC on the adjacents.
> 
> So, you get lousy digital coverage (out to the 20 mV/m contour, if you're 
> lucky), and if you have strong IBOC on an adjacent, your analog signal gets
> all hissed up beyond that contour.  Great system!
> A good real world illustration of this came from someone near Chicago.  See
> http://lists.radiolists.net/pipermail/broadcast/2007-September/060480.html
> for more gory details.
> 
> Barry
> 
> -- 
> Barry McLarnon  VE3JF  Ottawa, ON
> 
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