Eric:
Per our
conversation, I thought I'd fill you in on the results of my use of the Samsung
DTV STB (SIR-T165). Perhaps you will find this information
useful.
The purpose of
setting up the DTV STB was to determine if my current antenna setup is adequate
for DTV reception, in preparation for a later purchase of an HDTV. Hence,
I used a small screen convenient to work on, not one of our larger
TVs.
The STB is
connected to an OTA antenna, the Channel Master 3010 STEALTHtenna (with
the internal amplifier), rated to be a Large MultiDirectional. This
antenna is 15" by 52", chevron shaped and is mounted on a five foot mast on a
townhouse roof two floors above ground level, with no rotator. Total cost
of the antenna, amp, mast, support, etc, was less than $100.
I have a HTPC.
To connect the STB, I simply disconnected the composite, audio and S-video
connectors from my DISH satellite receiver and plugged them into the back of the
STB. The cables lead to an ATI 7500 All-In-Wonder video card installed in
the PC. The standard ATI software was used to drive the display, a Sony
21" (19" displayed) 4x3 CRT monitor. This small setup is used in our
master bedroom. The applicable rear switch was set to analog.
Nothing could be simpler. With this setup, I could switch between the
composite, s-video and satellite (NTSC only, via coax) inputs using the PC
software.
With all equipment
on, I set the STB to memorize (automatically scan and store all receivable
channels). It found all the analog channels we are accustomed to
receiving, including those from Baltimore. It also found 9 "channel
groups" of digital channels- 21 actual digital channels in all. I must
point out that it found one group, 75, consisting of channels 75-1 and 75-2,
that are not listed on antennaweb. This group mimics the channel 50
group. All DTV channels were received indicating medium strength
signals on the STB, except for the channel 57 group, which was a bit lower than
medium- yet all produced perfect video. All currently active digital
channels for this area, as listed by antennaweb, were found by the STB except
for channels 20.1 (WDCA in DC on freq 35) and 66.1 (WPXW in Manassas on freq
43). As WDCA is directly in line with the aim point of the antenna and is
a nearby station, I believe this station is not actually transmitting digitally
at this time. The other station, WPXW, is off axis to the aim of the
antenna (which is a multidirectional) and is located some distance away.
The analog counterpart of this station, channel 66, is received weakly here, so
the digital station may be transmitting at a low power level, if at all.
Since this is a PAX affiliate, and we already receive PAX via satellite, there
is no need for a rotator.
With the STB set to
display widescreen transmissions in letterbox, some 4x3 analog
programs retransmitted on a DTV channel as 4x3, are displayed in a box on
the screen on the DTV channel, surrounded by grey and black bars. Others
are displayed full screen. At first, I thought this was station
dependent, but the behavior is inconsistent. The same station
sometimes appears boxed in, sometimes not. The "boxed" screens can be forced to
full screen by the changing the STB to display widescreen transmissions as full
screen, but then this cuts off the edges of true widescreen programs.
Whether this is caused by the broadcasters or the STB, I don't know. Since
the 4x3 analog programs retransmitted on DTV stations as widescreen do not have
this problem, and certain stations were never observed to have this problem, I
suspect it is a station controlled situation. The STB does indicate HD
sometimes for non-HD 4x3 programs. The box never froze up, never locked on
one channel and refused to move. So either all PSIP data was perfect
(doubtful) or this problem no longer exists for this model.
Even on such a small
screen, the digital programs were unquestionably better than their analog
counterparts. They appeared sharper and had brighter colors.
Although most DTV stations are transmitting the same program as their analog
counterpart, and in SD not HD, there was still a noticeable improvement.
And enough widescreen HDTV was available to note that these were impressive, and
with no pixilation.
To continue the
test, I unplugged the monitor from the PC video card and plugged it into the
DB15 on the back of the STB. No other adjustments were made, the monitor
did any such adjustments invisibly. It just worked.
In case this
information may be useful to you, I list the stations received below. The
analog stations are listed, followed by any applicable digital station (number
dash number). Some digital stations have no analog counterpart, and some
only broadcast a fixed message:
2 ABC
Baltimore
4 NBC
DC
4-1
5
Fox
DC 5-1
7 ABC
DC
7-1 7-2
9 CBS
DC
9-1
11 NBC
Baltimore
13
CBS Baltimore
14
TFA Arlington
20
UPN DC
22
PBS Annapolis
24
UPN Baltimore
26
PBS
DC
26-1 26-2 26-3
26-4
UNI/IND
Goldvein 30-1
30-2 30-3 30-4
32
PBS DC
45
Fox Baltimore
50
WB
DC
50-1 50-2
54
WB Baltimore
56
IND
Fairfax
57-1 57-2 57-3
57-4 (yes, 56 and 57)
66
PAX Manassas
WB
75-1 75-2 mirrors 50-1
50-2
In short, for my
area at least, DTV is alive and well and ready to be a full time replacement for
the old broadcast analog NTSC signals.
BTW, I found you as
a rental source from the AVS forum. You were mentioned under a thread for
the DC area. If someone rents
this in the future that plans to connect it directly to a computer monitor via
the DB15, it produces absolutely smashing images set to analog and 1080 or
720. There is no need to leave the setting at 480i unless they run it thru
a PC video card first.