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From: mb@camcon.co.uk (Mike Bell)
Newsgroups: sci.electronics
Subject: Re: Info Wanted:  DECCA Navigation
Message-ID: <674@titan.camcon.co.uk>
Date: Thu, 2-Jul-87 07:20:22 EDT
Article-I.D.: titan.674
Posted: Thu Jul  2 07:20:22 1987
Date-Received: Sun, 12-Jul-87 11:32:21 EDT
References: <642@ge-dab.UUCP>
Organization: Cambridge Consultants Ltd., Cambridge, UK
Lines: 28


> Anyway, this fellow's receiver worked real well and sold for 
> the price of about a 6 month Decca lease.  After many canceled 
> leases the boys at Decca found out what was going on and they
> got one of his receivers, analyzed it and found that by 
> slightly changing the signal the bogus receiver dooesn't
> track anymore. But it didn't effect the mechanical works in a
> "real" Decca receiver.	(Arthur)
				

I bounced this story off an ex-DECCA employee.  He said it sounded
unlikely, because the specification of the DECCA signals are actually
layed down by legal statute, so unless the fellow's receiver relied
on something which wasn't in that specification...  

[There was no love lost between the ex-DECCA employee and
Racal-Decca, so I have no reason to doubt this...]

Apocryphal story:  apparently it used to be quite common for ships to
travel along the lines of constant phase - resulting in the
occasional collision between ships travelling along the same line in
opposite directions

(usual disclaimers...)
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