Chuck, small correction if I may: for 9 kHz spaced frequencies, they allow
for a 4.5, 9 and 18 kHz envelope.
Correct me if I'm wrong; but isn't DRM a digital-only mode? It's my
understanding that it's designed to co-exist with analog synchronous
transmissions such as you see in Europe, etc. on separate channels rather
than be plopped on top of and around an existing analog transmission.
Has anyone on this list experimented with DRM software receivers?
Rich Toebe
Vacaville CA
----- Original Message -----
From: "Chuck Hutton" <charlesh3@msn.com>
To: <irca@topica.com>
Sent: Tuesday, February 03, 2004 8:41 PM
Subject: RE: [IRCA] Digest for irca@topica.com, issue 1006
> Eric:
>
>
> The DRM spec allows operation at 5, 10 and 20 kHz spacing in all digital
> mode. In the 5 and 10 kHz modes, the bit rate ranges from 7.6 to 26.6
kb/s.
> That's nowhere near the IBOC rates, so let's consider the 20 kHz case: the
> range is 16.3 kb/s to 55 kb/s.
>
> In all-digital IBOC, subcarriers extend to =/- 9447.7 Hz from the carrier.
> The bandwidth is therefore 18.894 kHz. The bit rate is 40.4 kb/s.
>
> They both use 64QAM and 16QAM modulation which is the predominating factor
> in throughput hence
>
>
> Now show me your numbers to justify saying that all-digital IBOC is more
of
> a frequency hog than all-digital DRM. Please, let's not de-focus the
> discussion with comparisons to analog, whether it can operate below 1 GHz,
> etc.
>
>
> Chuck
>
>
>
> Date: Mon, 2 Feb 2004 23:28:17 EST
> From: N0UIHEric@aol.com
> Subject: Re: [IRCA] IBOC
>
>
> Chuck, this is where you're wrong. IBOC, no matter whether it's digital
only
> or a hybrid, is a FREQUENCY HOG. Analog AM sounds FAR BETTER and HAS FAR
> MORE
> COVERAGE than the low-quality IBOC sound. DRM is not as much of a
frequency
> hog, but frequencies below 1 GHz are NOT SUITED for digital radio.
>
> 73 and good DX from Eric
> Amateur Radio Station N0UIH
> Registered Monitor KDX0STL, KMO0CN
> Hazelwood, MO Grid Square EM48
> DXing The World since 1981
> Turn Off Clear Channel Communications!
> http://groups.yahoo.com/group/turnoffclearchannel
> PRAY FOR AN END TO COMMERCIAL RADIO DEREGULATION
> "For the love of money is the root of all evil"-1 Timothy 6:10
>
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