Originally Posted by Chuckkey
Dont know what happened to Gemini. I surmise the ATI has a faster processor and more integration. I was disappointed seeing I met Samsungs design team on that chip and was told by them it would be out this fall.
ATI seems to have some great engineering people there. I would not doubt that it does better than the Zenith chip.
I almost pushed the button, I'm sure a reset. Did not want to kill the box though. They are out of stock in LA right now and calling Samsung Customer Service would not be good.
Per your Cropped JPEG, the square chip next to the Alps "tin-can" tuner is labeled Sillicon Image and hence must be the HDMI interface chip---
This should have been obvious due to it's location next to the HDMI connector.
The Samsung DTB-H260F OTA STB uses the ALPS TDQU3-001A, which is a General Purpose VHF/UHF RF Tuner Module:http://www3.alps.co.jp/index-e.html
(Look under RF DEVICES/DIGITAL TERRESTRIAL TUNERS.)
The spec sheet for the TDQ series tuner specifies a "typical" Noise Figure of 7 dB (est. -84 dBm sensitivity),
which is equal to or better than many other tuners, but not quite as good as the Alps TEQ series tuner ("typical" N.F. is 5.5 dB VHF and 6 dB UHF).
I'm going to speculate that the RF performance is probably the same for the companion TDH series tuner,
which adds an ATI NXT2004 ATSC/QAM DECODER chip. FYI: The TDH2 is used in my Sylvania 6900DTE OTA STB and also the PrimeTV PHD101 OTA STB.
As posted above, the huge chip is the ATI Xilleon 240H (p/n 215H48AG21HG), which includes an ATSC/NTSC/QAM DEMODUATOR:http://ati.amd.com/products/brochure...AGlance_20.pdfhttp://ati.amd.com/products/xilleon240sh/index.html
ATI claimed that the Theater ATSC Decoder chips meet the ATSC A/74 Performance Guidelines.
The later Xilleon 240/260 chips incorporated the Theater ATSC Decoder functionality into the display driver chip.
Hence it appears that the Samsung HTB-H260F is a so-called "fifth gen" receiver.
ATI Press Release claimed ATSC A74 Performance Guidelines "compliance" (some? most? all?) for their Theater 310 and 313 ATSC Decoder chips.http://www.eetimes.com/showArticle.j...cleID=55300593
ATI provided A74 Field Ensemble test results in Jun05 Comments re SHVERA ILLR (ET Docket 05-102) for four ATSC Receivers:http://gullfoss2.fcc.gov/prod/ecfs/r...ent=6517693762
The best results were claimed for the latest ATI (presumably Xilleon?) chip with error free results for 34 out of 50.
The next best chip (preceeding Theater chip?) had very similiar results (32 out of 50).
The other two unnamed ATSC Receivers (one of which was called "3rd Gen") had error free results for only 9 or 10 out of 50.
Here is the link to the CRC tests, where the Samsung "Gemini" prototype, tested in Aug05 (a few months later than the above ATI test report),
had error free results for 38 out of 50 Field Ensembles--but probably different test equipment:http://www.crc.ca/en/html/crc/home/r...broadcast/rtnt
The Samsung prototype tested by CRC reportedly used an off-the-shelf Alps tuner and the so-called "Gemini" ATSC Decoder chip.
Based on what is in the DTB-H260F, I'm going to speculate that "Gemini" was an early version of the ATI Xilleon chip.
When tested, the Samsung prototype had much better performance than the nearly two-years earlier LG/Zenith "fifth gen" prototype:http://www.avsforum.com/avs-vb/showt...ld#post6339487http://www.avsforum.com/avs-vb/showt...rc#post6041081
Unfortunately, the CRC test on the LG/Zenith "fifth gen" Receiver (with the LGDT3303 ATSC Decoder chip)
was conducted on an early prototype in Sep03 and we have not seen any recent tests on the (more or less) final product.
I would be curious to know how many of the A/74 test ensembles would fail on the PRODUCTION LG/Zenith "fifth gen" Receivers (e.g. PC Cards and HDTVs).