I've been using the dvb-apps tools to scan for new clean QAM channels in my area on my HVR-1600, and noticed that the frequencies listed in /usr/share/dvb/atsc/us-Cable-Standard-center-frequencies-QAM256 only go up to 801000000, or us-cable channel 125. I also observed that when I scan for channels on my hdhr, using their hdhomerun_config utility, that the max frequency it scans is 861000000, or us-cable 135. So I thought I'd try scanning my HVR-1600 for the same frequencies that hdhomerun_config uses. The driver rejects a couple of the frequencies with the dmesg:
DVB: adapter 0 frontend 0 frequency 861000000 out of range (54000000..858000000) So I did a little googling, trying to figure out what are valid QAM frequencies, and came across this article: http://en.wikipedia.org/wiki/North_American_cable_television_frequencies The table for North American cable tv frequencies in that article goes up to channel 158, QAM frequency 999.00 MHz. The article also says: "Many cable providers currently don't distribute any video content above channel 139, or about 900MHz. As of 2009, it is common for TVs in North America with built in tuners to not search analog or digital channels above channel 139. Most TVs made before 2005 do not include a QAM tuner, and only have an analog cable tuner which often cannot tune beyond channel 125. With the addition of services such as premium HD content, cable providers such as Cox Communications and Insight Communications have begun to roll out digital cable services which use frequencies up to 1Ghz (analog channel 158), while also dropping the analog channel formats." So, my questions are: - Shouldn't I be able to tune frequencies up to 900 MHz, cable channel 139? - Is the limit mentioned in the dmesg output imposed by the driver software or by the hardware? - If it's driver software, should it be increased, maybe even up to 999 MHz, channel 158? - I'm using Ubuntu 10.10, kernel 2.6.35-28-generic. Could it be the upper limit has been increased in the latest v4l-dvb drivers? Inquiring minds want to know, Helen _______________________________________________ ivtv-users mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-users
