[linux-dvb] WinTV-NOVA-TD & low power muxes (Philip Pemberton)
dcharvey at dsl.pipex.com
Wed Apr 9 11:35:28 CEST 2008
Date: Tue, 08 Apr 2008 23:27:34 +0100
From: Philip Pemberton <lists at philpem.me.uk>
Subject: Re: [linux-dvb] WinTV-NOVA-TD & low power muxes
To: Greg Thomas <Greg at TheThomasHome.co.uk>, linux-dvb
<linux-dvb at linuxtv.org>
Message-ID: <47FBF156.5090703 at philpem.me.uk>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Greg Thomas wrote:
> /> After trying the latest drivers, I had a go under Windows; exactly the
> > same set of channels. I just guess the Nova-TD isn't that sensitive. I
> > may just have to look at boosting my signal, somehow :( /
Disclaimer: this is the problem as I understand it, and anything I say should
be treated as an unproven theory until proved otherwise...
The Nova-TD seems to have an odd problem. Specifically, it seems to have some
form of wideband low-gain amplifier/buffer on each aerial input (nothing like
the high-gain narrowband LNA amplifier on the Nova-T-500). This takes into
account the strongest muxes, not the mux you're currently tuned to (the T500
seems to do the latter -- which is more sensible).
What this means is that if you've got one mux that's significantly weaker than
the others -- e.g. the one that carries FilmFour vs. the PSB mux that carries
BBC ONE -- you'll see a reasonable signal on BBC, but a poor signal (if you
get a lock at all) on FilmFour.
What I did was put a 6dB attenuator between my aerial and the Nova-TD. This
weakens the signal to the point that all the muxes are in the Nova's capture
range. It locks on, and you get a near perfect signal on all the muxes.
Of course, it might just be that the input can't handle being overloaded, or
was designed for the two shabby WiFi-style antennae that were bundles with the
Nova-TD (which are truly useless). Those things probably wouldn't even work if
you were within a mile of the transmitter...
My signal's coming from Emley Moor, ~16 miles distance via a mid-high gain
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I vaguely remember someone mentioning this problem doesn't affect the TD
card/stick under the Windows driver. Can anyone confirm this?
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