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Old 08-13-2008, 09:32 PM
kricker's Avatar
kricker kricker is offline
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QAM frequencies for scan do not match tuning frequencies

While trying to get my HD merit control and guide issues figured out, I ran into a QAM frequency issue. I did a new channel scan with my HD tuner. Not all the frequencies that are in the file for scanning match with the frequencies used for tuning, therefore my scan finds very few channels. I changed the frequencies in the file used for scanning to match thosed used for tuning and it fixed it. I figured this should be noted, and might help others who find no channels when scanning.

QAMScan-AverMedia M780 PCIe Digital Video Capture 2-0.frq
CH:102 frq:663000000 
CH:103 frq:669000000
CH:104 frq:675000000
AverMedia M780 PCIe Digital Video Capture 2-0-QAM.frq
CH:42 major:0 minor:1 prog:1 phy:102 frq:661250000 mod:11 inv:0 #:DTV102.1
CH:43 major:0 minor:2 prog:3 phy:102 frq:661250000 mod:11 inv:0 #:DTV102.3
CH:44 major:0 minor:3 prog:5 phy:102 frq:661250000 mod:11 inv:0 #:DTV102.5
CH:45 major:0 minor:1 prog:1 phy:104 frq:673250000 mod:11 inv:0 #:DTV104.1
CH:46 major:0 minor:2 prog:2 phy:104 frq:673250000 mod:11 inv:0 #:DTV104.2
CH:47 major:0 minor:3 prog:3 phy:104 frq:673250000 mod:11 inv:0 #:DTV104.3
You can see above I have 3 channels in the 102 frequency and 2 in the 104 frequency, but my scan finds nothing. I changed the scan file to read to:
CH:102 frq:661250000 
CH:103 frq:669000000
CH:104 frq:673250000
Now the scan finds the channels. Anyone know where those frequencies for the scan come from and why they would not match the actual tuning frequencies? Based on Wikipedia my tuning frequencies are standard, but the scan file sage is using adds the 1.75 MHZ that pages lists for "channel center frequencies", whatever that means.

Last edited by kricker; 08-13-2008 at 09:41 PM.
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Old 08-14-2008, 12:12 AM
Fuzzy's Avatar
Fuzzy Fuzzy is offline
Join Date: Sep 2005
Location: Jurupa Valley, CA
Posts: 9,957
Is this perhaps a Standard vs. HRC tuning issue? Haven't dug into it too far, but I believe sage does feature the ability to use HRC tuning maps with an option in i believe. Just my first hunch on the matter.

EDIT: quick check of the freq's:

HRC IRC Broadcast
102 661.25 660.0330 661.2625
104 673.25 672.0336 673.2625

So.. doesn't look like that's where the numbers are coming from either...
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Last edited by Fuzzy; 08-14-2008 at 12:16 AM.
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