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Rockbox mail archiveSubject: Re: Possibly incorrect FM region settingsRe: Possibly incorrect FM region settings
From: Bertrik Sikken <bertrik_at_sikken.nl>
Date: Sun, 04 Jan 2009 12:20:54 +0100 Alessio Lenzi wrote: > "Mike Holden" <rockbox_at_mikeholden.org> wrote: >> boundary where it can be squeezed in.", suggesting that this is not >> exclusively Italy, but possibly other countries as well. > > european standard is 50, also the official Sansa's E200 firmware, by > setting Europe, lets skip 50 MHZ only. > Besides I bought a radio receiver in Hong Kong, not in Italy, setting > european region, step put automatically 50 MHZ. > In my opinion Rockbox doesn't need any changes to radio region's settings. Do you have a reference for the 50 kHz standard? (I don't think some radio bought in Hong Kong qualifies as a reference). In addition to what wikipedia says about the discontinuation of 50 kHz channels, recommendation BS412 from the ITU-R (International Telecommunication Union - Radiocommunication sector) says: "the carrier frequencies which define the nominal placement of the RF channels within the band are integral multiples of 100 kHz;" Also have a look at the frequencies used by European FM stations at fmlist.org : stations are spaced at 100 kHz intervals and stations using 50 kHz are extremely rare. How about the following settings: Europe: 87.5 - 108.0 MHz, 100 kHz steps, 50 us de-emphasis US / Canada: 87.9 - 107.9 MHz, 200 kHz steps, 75 us de-emphasis Japan: 76.0 - 90.0 MHz, 100 kHz steps, 50 us de-emphasis World: 87.5 - 108.0 MHz, 50 kHz steps, 50 us de-emphasis This isn't actually a big change, basically the old 'Europe' setting with 50 kHz spacing is now called 'World' and the old 'Korea' setting with 100 kHz spacing is now called 'Europe'. In most of Europe, people can now select the 'Europe' setting instead of having to choose the 'Korea' setting for optimum performance, except for Italy which uses the 'World' setting. I think I'll create a patch for this proposal and put in on the flyspray tracker. Kind regards, Bertrik Received on 2009-01-04 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |