Re: Unreliable tuning with HVR-950q

From: Steven Toth <stoth@linuxtv.org>
To: Scott Bronson <bronson@rinspin.com>
Cc: video4linux-list@redhat.com
Subject: Re: Unreliable tuning with HVR-950q
Date: Mon, 06 Oct 2008 11:43:18 -0400	[thread overview]
Message-ID: <48EA3216.90407@linuxtv.org> (raw)
In-Reply-To: <9d87242f0810011146r7c2b2083pdd7d940f4c427382@mail.gmail.com>

Scott Bronson wrote:
> On Fri, Sep 26, 2008 at 9:52 AM, Scott Bronson <bronson@rinspin.com> wrote:
>> On Tue, Sep 23, 2008 at 8:14 AM, Steven Toth <stoth@linuxtv.org> wrote:
>>> You're overwhelming the tuner/demod
>>> frontend with high RF levels.
>> The attenuators are in the mail, 3dB and 6dB...  I'll report back when
>> I've tried them.
> 
> I've now tried the attenuators.  Verdict: didn't help.
> 
> 3dB: no difference that I can detect.
> 6dB: probably a little worse
> 3dB+6dB in line: definitely worse
> 
> If I was overwhelming the tuner, wouldn't it have a hard time keeping
> the lock too?  Because once my 950q locks, it keeps it rock-solid
> forever, perfect video.  It's just getting it in the first place
> that's hard.

No, not necessarily. My comments to you were based on the fact that 
you're 1 mile from the broadcast antenna. Assuming your antenna is in 
good shape then I'd expect the hvr950q to be a great choice. It's got 
great sensitivity (xc5000 + AU8522) and I use it all the time (for 
digital cable).

Good result btw.

We've also done extensive testing on ATSC and we have no obvious issues.

> 
> My Pinnacle PCTV HD works 100% perfectly connected to the same
> antenna.  Locks every time, excellent video for hours.  No problems.

Hmm. Maybe we really are talking about a bad stick. Can you try this in 
a windows box?

I'd expect the performance to be the same under Linux and Windows. If it 
isn't then we have driver issues.

Can you try this?

> 
> Does anybody else have a 950q?  Does it work?  To me, it appears that
> either its tuner is junk or the Linux driver needs some work.  I guess
> my next step is to set up a Windows machine and try it there.

We _do_ have rock solid HVR950q support for digital, on lots of 
platforms in various locations.

Based on the facts so far it's probably something specific to your 
stick, your location or your testing. Try windows and report back if you 
can.

Regards,

Steve

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