I am not sure if this is the correct site for this question, so let me know if it needs to be moved.
Through the coax network I have set up in my house I can't seem to propagate antenna signals for any channel above 21. I am a little clueless as to what my main issue is, so here are the steps I took:
The previous owner of my house dry-walled everything, so I have no idea what's hidden in the walls/ceilings. I have successfully determined that in 3 rooms of my house I have 2 coax outlets each. One outlet in each room runs to the output of a 3-out splitter in my basement that was historically connected to cable TV. The other outlet runs to 1 of 3 random locations outside of my house, annoyingly.
I have since discontinued my old cable service (I was tuning using the QAM tuners of the TVs as set-top-boxes annoy me).
I have a reasonably good, 4-bay antenna in an upper room (Room 1) in my house. It gets a good number of channels, a fairly thick sprinkling between channel 2 through 62. I wanted to try routing the signal from that antenna to my other 2 TVs. So… I temporarily disconnected my antenna from the TV, and instead plugged the antenna into the wall outlet. I routed the Room 1 cable to the input of the splitter, which splits the antenna to Rooms 2 and 3. The following bad diagram explains what I did.
See bad diagram below:
The result of this in Room 2 and 3 is that all the channels above 20 are cut completely, but I get no losses of any of the channels from 2 to 20.
The splitter should not be purposely stripping any channels, as it is the same splitter that was being used with analog and digital QAM cable TV, and I don't believe there is any directional filtering on my [Room 1 to Splitter] cable run.
Could cable run length alone be perfectly cutting channels above 20, but none of the channels below?
EDIT
Here are some specifics.
Before going through the wall I have channel 20 (506MHz) and channel 30 (566MHz).
After the wall I still have 20, but not 30.
So, I would say (as do the comments) that it is frequency related, as I get no channels above 506-ish MHz.
Having said that, could it be that 30 and 32 are just weak channels for me, and 56, 62 are being especially attenuated by my cabling? Would a signal booster do anything for me?
Could my wall cabling possibly be limiting the frequency like this? VHF cuts off at 215-ish MHz, so I would expect that if I had the wrong type of coax I would not have channel 20.
Best Answer
You might try replacing the splitters. I had one outside a condo failing in such a way that it caused low frequency signals (<50 MHz) to be severely attenuated but higher frequency signals passed quite well. The result was that analog U.S. television channels 2 through 4 were garbage, 5 and 6 were snowy, and the cable modem worked very poorly. In this case, I think the splitters were degraded by flooding (high river levels submerged them for a couple days).