Contemporary Research 9 QMOD-HD Integration
Basic Troubleshooting
Symptom Solutions
QMOD constantly resets – analog
inputs
Usually, the encoder is resetting because the input video isn’t set to a correct
HDTV resolution or frequency.
Check if your QMOD has V 4.1 or higher firmware, if not, go to
www.crwww.com/downloads.asp, and install new firmware to your
QMOD.
Press SETUP, then arrow up or down and locate the MEASURE menu.
This will display the exact H/V frequency of the source video.
The H/V frequencies should be:
o H:33.715K V: 29.97 for 1080i
o H:44.955K V: 59.94 for 720p
o H:31.469K V: 59.94 for 480p
o H:15.734K V: 29.97 for 480i
You may see small changes in values, especially for horizontal, that do
not affect performance.
If the source is VGA, use a scaler like the TV One iT-C2-400 to conform
the video to a true HD signal. If the source is a scaler, check its manual
to see if it can be set to the correct vertical frequency. Some cameras
with HD Component Out can be set to 60/59.94 Hz.
QMOD SDI switches to
background color during setup or
occasionally.
The SDI input processor constantly tests the quality and resolution of the SDI
input, then auto-syncs the QMOD resolution to match 1080i 27.97 Hz, 720p 59.94
Hz, or 480i 29.97 Hz. If you’re getting a color background, watch the bottom right-
hand corner of the QMOD LED screen for:
“*” symbol – means the quality of the SDI signal is poor quality
“?” symbol – the SDI resolution does not match the above 3 settings.
Usually, the source video might be set for 60 Hz. Change the source
settings to the correct frequency.
QMOD channel tunes fine
connected directly to a TV, but
not when combined with in-house
RF system.
There are several classic caused for this. When you insert the channel into the
house system, there are added interference and level issues.
If you’re mixing with an incoming cable feed, assume there are no
“empty” channels. Usually, your QMOD channel conflicts with an existing
cable channel. Read the QMOD Integration Guide to learn how to use
blocking filters to screen out the offending cable channel.
When your combining the QMOD channel with an existing system, it has
to be set to the right RF level. For example, if the analog channels are
running at 55 dBmV, you’ll need an RF amplifier to raise the QMOD 29
dBmV out to at least 45 dBmV.
Use a digital RF meter.
QMOD channel is Green
Also could be Orange or Purple. This is the color background the QMOD inserts
when there is no or improper video input. This means that the QMOD is working,
the channel is tuned correctly, but there is an input problem. It’s also good test
signal when you set up QMODs before the sources are connected. You can also
feed audio to the QMOD and test that as well.
(17 pages)
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