I've seen variations of this question posted, but none are an exact match for my situation. My DirecTV coax from the dish, my Ethernet router, and my OTA coax from an external antenna all terminate in a small wiring closet under my stairs (in the middle of the house). The living room is where all my relevant electronics are: a single DirecTV H25 receiver (no whole home DVR or anything like that), my TV, a TiVo that I'm using to record OTA shows, and a Fire TV (to stream movies and other videos). There is a single coax that runs from the wiring closet under the stairs to my living room. There are *no* wired LAN connections from under the stairs to the living room (or any other room in the house, for that matter), so at the moment I'm using wifi to connect my devices in the living room to the Internet.
I have managed to get my OTA signal to share the stairs-to-living room coax with the DirecTV signal, by using two Holland DPD2 diplexers. Under the stairs, the "Signal to IRD" output from the SWM-8 goes to the SAT input of the diplexer, and the OTA signal goes to the VHF/UHF input of the diplexer; in the living room, those signals are separated back out via another Holland DPD2 diplexer. This configuration has been working without any problems.
The new wrinkle is that I'd like to get a more reliable Ethernet signal to some of the devices in the living room - especially the Fire TV, since I regularly stream HBO, Showtime, Hulu, Netflix, and Amazon Prime videos through that device. The question is, can it be done - and if so, how? I'm pretty sure I can't use MoCA (more specifically, High-RF MoCA) since it directly conflicts with/competes for much of the same bandwidth that the DirecTV signal does. (As I understand it, High-RF MoCA supposedly uses the 850-1500 MHz frequency range.) DECA (or Mid-RF MoCA) seems more promising, since it avoids any conflicts with the DirecTV signal by using the 475-625 MHz frequency range (or the 500-850 MHz range - I've seen conflicting info).
I know the simplistic/pat answer is that DECA and OTA channels can't share the same coax - but if I was willing to use a band stop filter on the incoming OTA signal, to remove those channels that would otherwise conflict with DECA, could that be done? Let's say I was willing to simply lose those OTA channels. I assume that all I would need to do, besides installing a band stop filter, is to use a "standard" diplexer to combine the (band stop filtered) OTA signal with coax output from my DECA adapter, and to use another diplexer in the living room to separate those signals back out. (I already have 2 Generation II DirecTV Broadband Ethernet to Coax Adapters, aka DCA2SR1-01s.)
I can't find any specs on the DCA2SR1-01, so I can't be sure what portion of the VHF/UHF spectrum I would lose. As I mentioned above, I've seen people talk about DECA using the 475-625 MHz frequency range, and other people mention a much broader range (500-850 MHz). Nor do I know if there's any way to "configure" the DCA2SR1-01 to use a specific frequency range, like you can with some MoCA adapters...
I have managed to get my OTA signal to share the stairs-to-living room coax with the DirecTV signal, by using two Holland DPD2 diplexers. Under the stairs, the "Signal to IRD" output from the SWM-8 goes to the SAT input of the diplexer, and the OTA signal goes to the VHF/UHF input of the diplexer; in the living room, those signals are separated back out via another Holland DPD2 diplexer. This configuration has been working without any problems.
The new wrinkle is that I'd like to get a more reliable Ethernet signal to some of the devices in the living room - especially the Fire TV, since I regularly stream HBO, Showtime, Hulu, Netflix, and Amazon Prime videos through that device. The question is, can it be done - and if so, how? I'm pretty sure I can't use MoCA (more specifically, High-RF MoCA) since it directly conflicts with/competes for much of the same bandwidth that the DirecTV signal does. (As I understand it, High-RF MoCA supposedly uses the 850-1500 MHz frequency range.) DECA (or Mid-RF MoCA) seems more promising, since it avoids any conflicts with the DirecTV signal by using the 475-625 MHz frequency range (or the 500-850 MHz range - I've seen conflicting info).
I know the simplistic/pat answer is that DECA and OTA channels can't share the same coax - but if I was willing to use a band stop filter on the incoming OTA signal, to remove those channels that would otherwise conflict with DECA, could that be done? Let's say I was willing to simply lose those OTA channels. I assume that all I would need to do, besides installing a band stop filter, is to use a "standard" diplexer to combine the (band stop filtered) OTA signal with coax output from my DECA adapter, and to use another diplexer in the living room to separate those signals back out. (I already have 2 Generation II DirecTV Broadband Ethernet to Coax Adapters, aka DCA2SR1-01s.)
I can't find any specs on the DCA2SR1-01, so I can't be sure what portion of the VHF/UHF spectrum I would lose. As I mentioned above, I've seen people talk about DECA using the 475-625 MHz frequency range, and other people mention a much broader range (500-850 MHz). Nor do I know if there's any way to "configure" the DCA2SR1-01 to use a specific frequency range, like you can with some MoCA adapters...