This issue could be down to a number of reasons so have a look over this checklist to locate the problem:
Too Much (or not enough) Signal
Conexer modulators are quite powerful and can easily overpower a TV set if the signal is not adjusted and considered. TV sets can generally tune to signals between 45dB – 65dB. If the signal is stronger or weaker then the picture can break up or disappear completely. Ideally, a signal strength meter would be used but if not then check the specification on the modulator and if any attenuation (signal reduction) has been applied in the menu. Then calculate the probable signal at the TV point(s). Start with the output level of the modulator and then reduce the signal by 2dB for every 10m of the cable run and don’t forget to add any signal gain from an amplifier if present. Ensure the signal is an appropriate level and adjust if required.
Poor Connection
Check all the connections for bad terminations or damaged cables.
Resolution Support
If the issues you encounter are to do with the DMHD04D/C products then check the resolution settings on the source. This model of modulator only supports progressive resolutions (720p/1080p etc) and not the interlaced equivalents (1080i for example).
Poor Quality Amplifier
If you have a distribution amplifier in place, this could be adding ‘noise’ into the system which will affect the quality of the signal and can cause picture break up. Try by-passing any amplifiers as a test to see if the poor picture issues go away.
Overloading the Bandwidth
When programming the DMHD04D/C the set up requires the input sources to be assigned to output streams via the green and red icons in the ‘modulation’ section in the table a the bottom of the software. The bandwidth of the DMHD04 is usually limited to 2 sources and the BW indicator informs the user of how much bandwidth is being used. Ensure the BW is only 50% – 75% to ensure the bandwidth is not overloaded. See example images of the software below:
Correct use of the bandwidth
Overloading bandwidth
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