HD-3000 has wrong tuner type
- Date: Thu, 6 Apr 2006 18:37:21 -0700 (PDT)
- From: Trent Piepho <xyzzy@xxxxxxxxxxxxx>
- Subject: HD-3000 has wrong tuner type
The pcHDTV HD-3000 is configured to have a Thomson DTT7610 tuner, but this is
wrong, at least for my card.
The tuner has a sticker on the side that says DTT 7612. I opened the can up,
and the PCB has printed on it "PCB DTT 7611X". The chips are an Infineon
TUA6030 and a Philips TDA9887TS.
The configurations for the DTT7610 and DT761X (X = 1..5) tuners are nearly the
same, the difference is the band switch points. The 7610 switches to the mid
band at 157.25 MHz vs 145.25 MHz, and to high band at 454 vs 415.25 MHz.
I checked cable channels 19, 20 and 62, which are right on the band switch
points. With the DTT7610 tuner, they come in poorly (19) or not at all (20 &
62). With the DTT761x tuner, they work fine.
So, it's clear that my HD-3000 has a 761X tuner, and that this makes a
difference. What I'm wondering is if there are different revisions of the
HD-3000, and older ones had a different tuner. How did the person who decided
to use DTT76110 come to that conclusion?
I don't have a DTT761X datasheet, but I do have a TUA6030 datasheet. Their
recommended band limits are much less, 127.25 MHz and 361.25 MHz. Did the
DTT761x limits come from someone with a data sheet, or are they just a guess?
--
video4linux-list mailing list
Unsubscribe mailto:video4linux-list-request@xxxxxxxxxx?subject=unsubscribe
https://www.redhat.com/mailman/listinfo/video4linux-list