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<blockquote data-quote="cewillis" data-source="post: 752265" data-attributes="member: 106719">I did talk to the cable companies head technician. The QAM frequency allocation method is Standard, which is what I used to scan for the channels.I realized the the Hauppauge monitor provides the capability to monitor both tuners. The two attachments show the results when I manually start (1) KOLD (103.35) then KVOA (139.25), and (2) KVOA then KOLD. The results are consistent with prior experience. If a problem channel is started first, all is fine. If a problem channel is started second, it's recording is very poor.As noted, switching service entrance splitter connections to increase the HTPC input by 3.5db increased the SNR of the 103.25 MHz channels to 37 from 36. It also seems to produce a few more correctable errors, and an occasional uncorrectable error.Additionally eliminating the TV / HTPC splitter, by replacing it with a straight-through connection, did not further increase the SNR, and seemingly caused increased numbers of both correctable and uncorrectable errors. (there are no error counts, but that's definitely what it looks like on the signal monitor and the video display)&nbsp; In this last case, the HTPC is connected directly to the service entrance splitter -3.5db branch.I have no clue why the last case should happen, unless -- a real stretch -- it's because the splitter I removed is also a 5 - 2500 Mhz band-pass filter.In sum, it doesn't look like amplifying the input signal would help the situation. Do you agree?</blockquote>

[QUOTE="cewillis, post: 752265, member: 106719"] I did talk to the cable companies head technician. The QAM frequency allocation method is Standard, which is what I used to scan for the channels. I realized the the Hauppauge monitor provides the capability to monitor both tuners. The two attachments show the results when I manually start (1) KOLD (103.35) then KVOA (139.25), and (2) KVOA then KOLD. The results are consistent with prior experience. If a problem channel is started first, all is fine. If a problem channel is started second, it's recording is very poor. As noted, switching service entrance splitter connections to increase the HTPC input by 3.5db increased the SNR of the 103.25 MHz channels to 37 from 36. It also seems to produce a few more correctable errors, and an occasional uncorrectable error. Additionally eliminating the TV / HTPC splitter, by replacing it with a straight-through connection, did not further increase the SNR, and seemingly caused increased numbers of both correctable and uncorrectable errors. (there are no error counts, but that's definitely what it looks like on the signal monitor and the video display) In this last case, the HTPC is connected directly to the service entrance splitter -3.5db branch. I have no clue why the last case should happen, unless -- a real stretch -- it's because the splitter I removed is also a 5 - 2500 Mhz band-pass filter. In sum, it doesn't look like amplifying the input signal would help the situation. Do you agree? [/QUOTE]

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