What MoCA frequency bands do DirecTV and Dish use: E, F, or G? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 5 Old Yesterday, 08:23 AM - Thread Starter
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What MoCA frequency bands do DirecTV and Dish use: E, F, or G?

This is a seemingly simple question, but it's apparently also a massive secret! My guess would be that Dish uses band F while DirecTV uses E or G, but I can't seem to find out for sure! Does anyone know?

A Google search for "DirecTV MoCA frequency band" returns many pages but little more than very basic info. Yes, I know that MoCA added new, lower frequency bands for satellite TV use, since the original MoCA frequency bands conflicted with traditional satellite LNB frequencies. Yes, I know that poses a problem for the few of us who used to diplex satellite and OTA or cable signals. But MoCA added three different bands in the 500-850 MHz range, and it seems some limited diplexing may still be possible, depending on which band is used:

  • MoCA band E goes from 500-600 MHz
  • MoCA band F goes from 675-850 MHz
  • MoCA band G goes from 500-800 MHz

Obviously bands E and G are completely incompatible with OTA UHF frequencies, so the only OTA diplexing possible would be with VHF. But band F would allow UHF up to roughly 575 MHz (roughly OTA channel 30 or cable channel 80). So I'd like to know which systems use which bands, just to know what's theoretically possible.
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post #2 of 5 Old Yesterday, 12:44 PM
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Fol. "MoCA 2.0" and "MoCA 2.0 and 2.5, Aug2016" Specs define fol. Bands:
http://www.mocalliance.org/MoCA2/spe...cs-150406d.pdf
http://www.mocalliance.org/MoCA2/spe...cs-160808d.pdf

Band D (1125 MHz-1525 for CATV),
Extended Band D (1125 MHz-1675 for CATV),
Band E (400-700 MHz for DirecTV),
Band F (650-850 MHz for Dishnet),
There IS NO "Band G" defined in MoCA 2.0.

In searching I found that DirecTV uses Band E [overlaps OTA UHF Band]:
http://www.gizmolovers.com/2011/09/0...ere-one-at-all

And Dishnet uses Band F [of course....gotta be DIFFERENT, overlaps upper part of UHF Band [which is going away soon], so be careful choosing DVR's UHF "TV OUT" and may or may not be compatible with OTA Antenna via "SUPER HOME NODE" depending on OTA Freqs and occupied MoCA Freqs]:
https://forum.dish.com/viewtopic.php?f=18&t=18130
http://www.sadoun.com/Sat/Products/D..._Diagram_4.pdf [Incompatible with MOST CATV systems]
https://www.summitsource.com/Eagle-A...Kit-P8272.aspx

BTW: Just to keep things INTERESTING, they CHANGED the Band Designations from what they were in MoCa 1.0, where each sequential letter designates ever higher group of Frequencies, with the HIGHEST Freqs being "Old Band G" and "Old Band H":
http://www.mocalliance.org/MoCA1/spe...cteristics.pdf [Used in Very Early Devices.]

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post #3 of 5 Old Yesterday, 02:02 PM - Thread Starter
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Quote:
Originally Posted by holl_ands View Post
There IS NO "Band G" defined in MoCA 2.0.

BTW: Just to keep things INTERESTING, they CHANGED the Band Designations from what they were in MoCa 1.0, where each sequential letter designates ever higher group of Frequencies, with the HIGHEST Freqs being "Old Band G" and "Old Band H":
http://www.mocalliance.org/MoCA1/spe...cteristics.pdf [Used in Very Early Devices.]
Yes, I got "Band G" from the same MoCA 1.1 spec you linked above. It confused me because the frequency chart lists a "Band G" that overlaps bands E and F (and tunes in 50 MHz increments vs. 25 MHz increments for all the others), but there's nothing else in the spec about it! And naturally they had to reshuffle everything for MoCA 2.0. Thanks for the clarification.
Quote:
Originally Posted by holl_ands View Post
In searching I found that DirecTV uses Band E [overlaps OTA UHF Band]:
http://www.gizmolovers.com/2011/09/0...ere-one-at-all

And Dishnet uses Band F [of course....gotta be DIFFERENT, overlaps upper part of UHF Band [which is going away soon], so be careful choosing DVR's UHF "TV OUT" and may or may not be compatible with OTA Antenna via "SUPER HOME NODE" depending on OTA Freqs and occupied MoCA Freqs]:
https://forum.dish.com/viewtopic.php?f=18&t=18130
http://www.sadoun.com/Sat/Products/D..._Diagram_4.pdf [Incompatible with MOST CATV systems]
https://www.summitsource.com/Eagle-A...Kit-P8272.aspx
Thanks! That's kind of what I suspected. Since Dish has those 2-tuner receivers with (analog, I think) UHF modulators for the second tuner, they probably wanted to reserve a chunk of UHF bandwidth so those would still work.

Anyway, upshot is, diplexing OTA could theoretically still work with Dish systems, especially after repacking; assuming of course someone is making (or going to make) new diplexers with the correct frequency cutoffs. (And here I thought repacking was a bad idea!) But diplexing OTA with DirecTV is hopeless, except perhaps for VHF.

Here's an off-the-wall thought: could you diplex the handful of VHF OTA channels with DirecTV using simple UVSJ's (assuming the DC pass-thru is on the UHF side) by putting the satellite signals on the UHF side and the OTA signals on the VHF side? Or is their performance too poor up in the 2GHz range for this to work?

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post #4 of 5 Old Today, 11:01 AM
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ADTech measured Freq Response up thru 1000 MHz for A-D, Holland, Pico-Macom, and Radio-Shack VHF/UHF Diplexers (aka UVSJ) and didn't see ANY high freq anomalies. So it's worth a TRY to see if that hold true up on higher freqs...only thing that would limit it would be stray capacitance. DC PASS is on UHF Port ONLY for A-D and R-S....whereas for Holland and Pico-Macom it's ONLY on VHF port [inherent in a simple LPF Filter on that Port].

Yes, "TV OUT" on Dishnet DVR is Analog NTSC so that REALLY Old TV's [via RF R/C] could independently pull up one of the recorded programs...or take control of the DVR's SAT Feed. Alternative would be to buy/lease another Receiver or DVR.
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post #5 of 5 Old Today, 09:24 PM - Thread Starter
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I ordered a couple of the RS UVSJ's from eBay. They claim to work up to 1100 MHz. That's nowhere near 2150 MHz but they still sounded like the best bet, and they were only $7 each.

I do have a DirecTV installation I can try it out on (not my own, but my in-laws' guest bedroom). It'll probably be August before I'm up there to give it a try though.

Of course, given their location in Stroud, OK - about halfway between OKC (2 VHF channels) and Tulsa (3 VHF channels) - and that the .1 OKC subchannels are on DirecTV anyway, it's hardly worth the effort. But I've gotta satisfy my curiosity now....
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