[BC] Interesting IBUZ article & WTW

[Robert Meuser]

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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