[linux-dvb] WinTV-NOVA-TD & low power muxes (Philip Pemberton)

David Harvey dcharvey at dsl.pipex.com
Wed Apr 9 11:35:28 CEST 2008


/Message: 4
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 
wideband aerial./

-- Phil. | (\_/) This is Bunny. Copy and paste Bunny lists at philpem.me.uk 
| (='.'=) into your signature to help him gain http://www.philpem.me.uk/ 
| (")_(") world domination.



I vaguely remember someone mentioning this problem doesn't affect the TD 
card/stick under the Windows driver.  Can anyone confirm this?

Cheers,

dh

:





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