Unfortunately, there is nothing higher than seven (range of HDMI extender receiver signal level is 0..7).
My next theory is that maybe the length of Cat5E is too
Extenders are designed to extend the distance between the source equipment and display (sink equipment) beyond the maximum specified distance of an HDMI cable. I am not using the extender for its intended purpose. Rather, I am using it in place of an HDMI cable because when the house was under construction HDMI was unheard of and we ran display connectivity cables consisting of 5x75-ohm RGBHV cable, a RG6QS cable, and a Cat5E cable (intended for IR control). When the customer wanted to refresh his A/V equipment, it made sense to reuse the Cat5E cable for HDMI connectivity rather than opening up the walls and running an HDMI cable. I'm starting to think that this was a mistake.
Anyway, back to my theory. The most noticeable difference seems to be the setting of the rotary switch on the HDMI extender receiver unit labeled 'signal level'. It turns out after talking with some technical folks that it is really not a signal level per se, but rather an equalization setting to compensate for different length cables.
From my previous posts, '0' didn't work at all and '1' through '3' exhibited frequent flickering. When it was set to '4' (where is was originally) it was less frequent and more intermittent. '7' seemed to be the best. '6' was worse than '7' but better than '4'.
Today, I am going to try inserting 50-feet or so of Cat5E to increase the overall length of the cable. Before I add this, I will measure the length of the installed cable using a TDR, and measure the length after. I will probably start out at '7' and see how that works.
Other ideas I have yet to try:
- order another HDMI extender (same model) in case I happen to have a defective one.
- run an external Cat5E/Cat6 to see if there is a problem with the installed cable
- run an external HDMI cable to eliminate the possibility of anything else causing the problem and reevaluate whether using HDMI extenders for this application is viable
By the way, it turns out that this particular HDMI extender product shows up under several manufacturers. The one I have is a Siig. I've seen it also offered by Aurora Multimedia, and Tripp-Lite.
I'll keep you posted.