Re: LF: Re: BBC 198

[Daniele Tincani <danieletincani@yahoo.com>]

> I'm not sure it was a European thing - I think these frequencies are agreed worldwide.

As far as I know, MW BC stations in the Americas use 10 kHz channels.

 

Best regards

D.

Da: Chris Trayner <C.Trayner@leeds.ac.uk>
A: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Inviato: Mercoledì 9 Novembre 2011 9:02
Oggetto: Re: LF: Re: BBC 198

Hi Alan,

Thanks for your thoughts.

On 2011 Nov 8, at 22:39, Alan Melia wrote:

> Hi Walter we were too, but it was a "European" thing: :-)) the EBU defined a
> 9kHz grid. with no thought of history. of usage.

I seem to recall that both MF and LF stations had been at 9 kHz spacing long before that. The change was to shift the frequencies to integer multiples of 9 kHz. The reason (if I remember aright) was to facilitate receivers with digital oscillators, though I forget the details.

At the same time there was a suggestion of 8 kHz spacing to allow more stations (given that you would hardly call MF or LF music quality anyway). There was too much opposition to that.

I'm not sure it was a European thing - I think these frequencies are agreed worldwide.

As for a sense of history, I imagine the feasibility of affordable radios mattered more than having to adjust the tuning dial a little. I'm not sure the exact frequency is of as much cultural importance as, say, Britain going over to decimal currency.

73,
Chris G4OKW