[linux-dvb] Re: Technotrend DVB-T 1.2 recommended for UK?

[Ragnar Sundblad <ragge@nada.kth.se>]

--On den 8 juli 2003 02:27 +0200 Nils Ohlmeier <nils.ohlmeier@web.de> wrote:

> It's no official patch from the list. When someone published the patch
> which  considers the frequence i played around with the values. And i get
> the best  result with the patch below (i know that i could remove the if
> ;).
I guess you are referring to my patch to make the frontend
more ALPS compliant.

I played around with the power and the diveder values quite
a lot when I had my previous power supply with the poor(er) 12V.
I could get slightly better results with another power/divider
setting on some frequencies, but settled with the ALPS
recommended one.

Note that you can get quite instable tuning and problems
tuning upwards or downwards and all other kinds of weird
behaviour if you change those values. Nils seems to have
found good values for him, but other experimenters should
keep this in mind!

This is what I mean with that the tuner voltage DC/DC
converter is a bad design on these cards - it is highly
dependant of the level and cleanliness of the 12V it gets,
the voltage has to be at least some 12,0V which is higher
than what is normally acceptable for a PC power supply, and
it doesn't seem to really keep up with load anyway.

I have been thinking of replacing that piece of circutry just
to see what happens, but I haven't got around to that yet.

/ragge

> Greetings
>   Nils
>
> --- alps_tdlb7.c        2003-07-08 02:19:51.000000000 +0200
> +++ alps_tdlb7.c.new    2003-07-08 02:18:47.000000000 +0200
> @@ -148,9 +148,9 @@
>         int pwr;
>
>         if (freq <= 782000000)
> -               pwr = 1;
> +               pwr = 3;
>         else
> -               pwr = 2;
> +               pwr = 3;
>
>         buf[0] = (div >> 8) & 0x7f;
>         buf[1] = div & 0xff;
>
>
>
> --
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