[linux-dvb] Re: Evil transmitters: a gotcha with the scan program (but not it's fault)

[Gavin Hamill <gdh@acentral.co.uk>]

On Thu, May 08, 2003 at 05:51:31PM +0000, Franck Arnaud wrote:
> Simeon Walker:
> > When I tried using scan something about the Wenvoe transmitter passed
> > by followed by a whole string of failed tuning attempts.
> 
> I wonder how does the "scan" in terrestrial set top box works? Surely 
> Joe Public is not supposed to type in frequencies and parameters with his 
> remote control. Does it simply try every UHF channel with all possible 
> offsets? Maybe we could write a scan program that does this?

<nod> It wouldn't be difficult. UHF 21 -> 69 with three offsets per 
channel gives only 144 actual frequencies that UK digital television can 
be broadcast on.

The scan would be faster if, for example, the search list is ordered by 
ERP of each transmitter, so major players like Crystal Palace, Winter 
Hill, Durris, Emley Moor, Rowridge, Divis, etc. would be scanned first, 
and then the rest...

http://www.itc.org.uk/uk_television_sector/reception_advice/digital_trans_guide/index.asp?region=show_all

gdh



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