[mythtv-users] Hauppauge 1609 and Pixelation Tests

Daryl McDonald darylangela at gmail.com
Sat Jun 1 11:05:09 UTC 2019

On Sat, Jun 1, 2019, 01:57 Stephen Worthington <stephen_agent at jsw.gen.nz>

> On Fri, 31 May 2019 14:12:17 -0500, you wrote:
> >
> >Hi James!
> >
> >> My wife berates me for talking funny! My appologies.
> >
> >Wow! You get to speak?! <bseg>
> >
> >
> >> I?ve tried lots of tuners, the worst of which was unwatchable on the
> worst channel on HD
> >> Without changing anything in the signal path I?m now using the Haupague
> Win TV usb tuners.
> >> I?ve not seen a single block or stripe since getting them.
> >
> >Ah! OK, that is what I thought you intended: with various tuners the
> >worst viewing was unwatchable on a weak/distant/incorrectly aimed station.
> >
> >“Everything” makes a difference: tuner, cable (coax), antenna. With the
> >TV tuners seems none list the sensitivity (µV), so pretty much have to
> >guess and reply on others’ experiences. (One reason why I posted my
> >follow-up which started this thread.)
> >
> >Use of good-quality cable (coax): RG-6/U vs. RB-59/U – even then there
> >are multiple options. Check your cable: I’ve had
> >commercially-manufactured extension pieces (~18” long) where the center
> >conductor slipped: was pushed during installation so one end barely
> >touched the splitter’s connector and the other end extended into the
> tuner.
> And do not forget the joints - make sure they are screwed together
> properly.
> >Antenna aiming: where the studios are aren’t necessarily where the
> >transmitter site is. At my location (house) the studios are in various
> >surrounding cities west and south but all except one transmitter are at
> >an Antenna Farm 20 mile south-southeaast.
> >
> >You probably know all that, just a good review (especially that quirky
> >cable-slid one!)
> >
> >Most of the reception problem here seems to be external factors,
> >combined with tuner specs, I think similar to your issues. Calm wind,
> >good recordings. Windy conditions, start to get pixelation issues; seems
> >to be some correlation with the RF Channel (the actual frequency the TV
> >station is transmitting, not its virtual channel), though that tends to
> >fall apart as locally there are two stations, one RF36 and the other
> >RF38, both 1000KW, on literally the same tower. yet RF36 will pixelate
> >horribly and RF38 will be a clear picture.
> Tuners and aerials have a centre frequency they operate best on, and
> performance tends to fall off gradually the further away from the
> centre frequency a transmitter is operating on.  So for two stations
> on the same tower at the same power, the difference in frequency will
> usually explain different reception on the same tuner.
> >As for the Backend tuners, LIS previously the newer Hauppauge 1609 tuner
> >has worked well for me. Admittedly due to a little sloppiness in my
> >quickly connecting to an antenna the Backend with the 1609 inside is
> >connected to the antenna and splitter feeding the old Backend with the
> >1600 and 2250 tuners. IOW the two Backends are on the same antenna and
> >so getting the same signal. The new Backend (with 1609) is recording a
> >1000% better under mediocre reception conditions compared to the old
> >Backend.
> So are you saying your 1609 tuner gets a direct feed from an aerial,
> but the 1600 and 2250 tuners get a split feed?  If that is the case,
> the 1600 and 2250 tuners will be getting a bit less than half the
> signal level of the 1609, so you can not compare the performances that
> way at all.
> _______________________________________________
But isn't this a comparison between a signalsplit for two separate tuners
and a signal fed into a quad tuner?
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