[ARC5] Old and new...

[Brooke Clarke]

Hi Robert:

Civilian GPS can be totally jammed by all kinds of things.  Some years ago a small sail boat in Monterrey harbor with a 
malfunctioning TV amplifier shut down
the whole bay.  A trucker on the east coast shut down an airport using a jammer he used to keep his employer from 
tracking his truck.  This works because the GPS signal is very weak and so a low powered transmitter will jam it.

LORAN-C is on 100 kHz and the stations are grouped into "chains" where a master station transmits then, after defined 
time delays, the "slave" stations transmit.  Just prior to decommissioning LORAN-C a new version called eLORAN was being 
tested.  This version works more like GPS where each station is triggered by an atomic clock rather than based on some 
time delay from the chain master station thus a receiver can find it's location using any 2 or more stations it can 
hear.  In addition there's a stream of digital data added that the old LORAN-C system did not have.  Since the LORAN 
stations transmit with very high power and it takes a very large antenna to radiate at 100 kHz a small portable jammer, 
like the ones for GPS, are not possible.

-- 
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html

-------- Original Message --------
> I can't comment on the performance of LF Loran but I can confirm that GPS goes off line when under something as 
> insubstantial as a bank drive-through.  Proved it again this afternoon.  As soon as I pulled up to the pneumatic tube, 
> The display in my Land Rover stopped telling me that I was just East of Gessner and started telling me that I was in 
> Houston.
>
> The problem with LORAN is that I can't see how it could give a fix precise enough for conventional ordnance.
>
> Robert Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
>
> In a message dated 08/08/2017 15:33:07 PM Central Daylight Time, kv6lee at gmail.com writes:
>> The new LORAN at 100 KHz can penetrate into buildings and basements in which GPS is useless - or so I'm told.  The 
>> new LORAN should provide a good fix, and enhance Position-Navigation-Time (PNT) capabilities in challenging environments.
>>
>>
>> 73 de Bart, K6VK ##
>
>
>
>
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