[BC] Interesting IBUZ article & WTW

[Glen Kippel]

Quite right -- I cannot use my GPS anywhere near our transmitter site due to
the RF pollution from numerous sources.  But I was talking about the NDB's
(Non-Directional Beacons) operating below 500 kHz, not LORAN-C which is 90 -
110 kHz.  My preference would be to use analog in the present broadcasting
spectrum of 150- 280 kHz, and digital (preferably DRM) in the area above
that.  Anyway, VOR is still in use as a fallback to GPS.

On 3/24/07, Robert Meuser <Robertm at broadcast.net> wrote:
>
>
> A few comments. GPS may well have noise problems. I know that my
> handheld unit will not work in Manhattan unless I am right by the river
> on the harbor. I always thought it was building reflections but noise
> and attenuation might be the real issue.
>
> De commissioning NDBs and possibly using them as broadcast frequencies
> would have no impact on the Loran issue since we would be discussing
> frequencies 150 kHz to 500 kHz.  I think it would make great sense to
> build receivers capable of digital reception from 150 kHz to 3.5
> megahertz or even to 27 megahertz.. Stations could be added based on
> available white space as other services are de-commissioned. Since
> virtually all users of the lower part of that spectrum have fixed
> facilities, it would be easy to keep both the existing and new service
> protected. To facilitate tuning, the radio would learn where the digital
> channels are located and skip the spaces in between. This is how some
> DRM receivers already operate.
>
> R
>
> Jonathan E. Hardis wrote:
>
> >> I am not sure whether the LED traffic lights generatie noise because
> >> they
> >> are LED, or because they are switched with triacs instead of relays.  I
> >> would think that the former would be more reliable.  Anyway, yes, I
> >> would
> >> support your proposal, and even have some high-power AM stations on the
> >> long-wave band.  Fewer people navigate by the NDB's there, preferring
> >> to use
> >> GPS or even VORTAC, and those old longwave beacons are being closed
> >> down all
> >> the time.
> >
> >
> > Actually, FYI, you have it backwards.  GPS signals are highly
> > vulnerable to interference, sometimes with severe consequences. Since
> > we're becoming more and more dependent on GPS, the longwave system,
> > LORAN at 100 kHz, is gaining new credibility to act as a backup.  See:
> >
> http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=2007_register&docid=fr08ja07-82.pdf
> > and the web references therein.
> >
> >   - Jonathan
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