here is a comparison between the 955q and hdhomerun3.
stats from hdhomerun3 come from 905shmick's bash script. the 955q just manually tuning and taking notes.
That 955Q really does perform well.I just hooked it up to the outdoor antenna system and compared it's 'signal strength' and 'snr' to the hdhomerun. In particular,there is this one channel here,rf ch 38. which is always somewhat degraded snr wise,despite having a really strong signal. Note that RF 38 and RF 39 transmitters are on the same hill, about 1mi away from each other, with similar transmitter ERP and height.
I have always suspected RF 38 is experiencing some multipath degradation here. But have never got around to trying to find a better location on my property for the antenna to see if it made any difference.
The 955Q is the first USB tuner I have used which didn't seem to have that degradation on that specific channel. I will play around with azimuth later tonight,
to see if I can find an azimuth where the degradation is apparent on the 955Q
Also, the 955Q is the first USB tuner I have seen which is capable of reporting raw Signal Strength in dBm. Should be extremely helpful to folks understanding what's really going on while troubleshooting. All my testing is in linux, so I don't know what the Hauppauge Windows driver does at all. I should point out that the linux driver's counter for 'BER' reports nothing but all FFs (0xffffffff) on every signal. Something is in the
wood pile in that regard. So, I took a look at the driver's source code and played around with it in debug mode. Think I have a fix for that which
I have tested here. Seems more reasonable to me now, but with no documentation on the chip, there's really no real way to positively confirm.
Why I like open source software so much...when something inevitably doesn't work quite the way you like, at least you have the opportunity to change it
the hdhomerun3 stats are on the left,955Q are the last 2 columns on the right. They seem to correlate quite well. Makes a believer out of me so far...