[opendtv] Re: New PrimeDTV PHD-100 OTA STB
- From: Mark Aitken <maitken@xxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Mon, 30 Jan 2006 17:19:52 -0500
Because of the close integration of the demod chip with the tuner, more
than likely there is a second NTSC tuner circuit, which would require a
RF split...
Richard Hollandsworth wrote:
>I don't see how adding an NTSC/BTSC decoder chip affects the Noise Figure.
>The output of the IF Amplfier strip would presumably be split to feed both the
>ATSC/QAM Decoder chip and the NTSC/BTSC decoder chip. Since the IF Splitter
>loss would be at the end of the IF Amplifier chain, the reduction in overall
>Noise Figure would be much, much less than a dB.
>Of course if the NTSC/BTSC decoder function were built into the ATSC/QAM
>Decoder chip, using a common A/D Converter, there would be no need for an IF
>Splitter,
>for example the Broadcom BCM3520 ATSC/QAM/NTSC/BTSC Decoder chip and BCM3560
>DTV SYSTEM-ON-CHIP.
>
>--------------------------------------------------------------------------------------
>Another data point:
>Sylvania/Funai 6900DTE OTA STB -- rear panel says 20W operating.
>
>It uses the ATI XILLEON 226 MPEG2 and Display Processor, which does not
>require a heat sink....
>And an Alps TUHU2 tuner with older ATI NXT2004 ATSC Decoder chip.
>ATI website seems to imply that all of the XILLEON 220 series are 300 MHz
>processors.
>I posted photos as part of my Smart Antenna evaluation in the avsforum "5th
>Gen Receiver Chip" thread.
>
>---------------------------------------------------------------------------------------
>A clarification: my comment re best performing STBs applied to those actually
>tested for the FCC report.
>Since they bought off-the-shelf products in AUG/SEP 2005, I don't think they
>had any of the MPEG4 capable DirecTV H20 HD-STBs which came later.
>(Various DirecTV H20 manufacturers reportedly include LG, Samsung, Thomson and
>maybe Humax).
>
>----------------------------------------------------------------------------------------
>PS: Model number is PHD-101. Thanks for catching the typo...
>
> <holl_ands>
>
>************************************************************************************
>"Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx> wrote: Richard
>Hollandsworth wrote:
>
>
>
>>Fol post has info on the $160 PrimeDTV PHD-100 OTA STB.
>>
>>
>http://www.avsforum.com/avs-vb/showthread.php?p=3D7022533&#post7022533
>
>
>>It does ATSC and QAM and probably also NTSC (the manual
>>is somewhat unclear). Copyright date for manual is 2005
>>and the pdf create date is only a month ago: 20Dec2005.
>>
>>
>
>On the question of NTSC support, looks like Digital
>Stream used to provide it, but no longer. Their original
>1150 supported NTSC, the Accurian and 3150 Plus don't.
>Which is probably a good thing. Seems to me that having to
>support NTSC can only degrade ATSC performance, mostly
>because, all else equal, it probably increases the noise
>figure of the receiver.
>
>I was looking for the power requirements of the PHD-101,
>to see if the downward trend continues. Couldn't find any
>for the PHD-101, but they did mention the unit gets warm.
>which makes me wonder. For your info, here are some power
>specs in units I've read about, in chronological order:
>
>Digital Stream 1150: 40 W operating, 2 W standby
>Accurian: 22 W operating
>Digital Stream 3150 Plus: 20 W operating
>Humax HFA-100: 18 W operating
>
>(Not sure about the respective ages of the last two.)
>
>I'm all in favor of A/74 becoming the de-facto
>performance standard, as it appears to be doing. And
>finally this PHD-101 seems to be in line with what I
>was expecting as state of the art STBs available by now.
>This is great news. Notice also how this unit is easily
>configured for any global DTT or digital cable standard.
>
>FINALLY.
>
>Thanks for the pointer, Richard.
>
>
>
>>I believe that the best performing STBs were probably
>>from LG and at least some of the other units were from
>>ATI, based on correlation with LG and ATI test results
>>
>>
>
>I would be surprised if the new Samsung Gemini chip units
>don't beat out the LG, after they've sorted out the front
>end. Measurements don't lie. (Of course, I'm sure LG
>isn't standing still, even if they don't make their good
>stuff available as STBs or PVRs.)
>
>I especially liked ATI's testimonial to the FCC.
>
>Bert
>
>
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--
><> ><> ><> ><> ><> ><> ><>
Regards,
Mark A. Aitken
Director, Advanced Technology
<>< <>< <>< <>< <>< <>< <><
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