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Discussion Starter · #1 ·
Not really a Tivo/MOCA problem but I'm at a loss. I have created a Moca network as shown in the attached pdf file for OTA viewing, no cable programming. From a process of elimination it appears that when I connect the input from Spectrum, my broadband supplier, the signal strength of 4 out of 5 channels drops from around 75% to below 40% and the SNR from 29db to 15db. I swapped out the 2 Antronix splitters for a 3-way Ideal splitter rated 5Mhz to 2.4Ghz and also replaced the incoming POE filter. I'm assuming the POE filter is an active band pass filter because if I just disconnect the cable input and leave the filter in place, the problem goes away. The frequencies affected are 491Mhz, 545Mhz, 671Mhz and 683Mhz. The only channel not affected runs on 201Mhz, therefore I think I have an impedance problem somewhere but I can't figure out where. Any help would be appreciated. Not much hair left to tear out.
 

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TDL shepherd
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I'm surprised it's working at all, and that you have any Internet connectivity. Cable TV/broadband and OTA operate within the same frequency range and so cannot share the same coax plant.

OTA: 40-806 MHz
Cable: 5-1002 MHz
MoCA: 1125-1675 MHz
Related post >here<.
 

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TDL shepherd
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The workaround employed by many is to use an antenna/satellite diplexer to allow (mostly) only the MoCA signals to pass between the antenna and CATV/BB coax segments, per the following post...
Re: antenna/satellite diplexers

Though we're not working with satellite signals, antenna/satellite diplexers can be helpful in some MoCA setup scenarios. The difference maker is that the MoCA technology employed in TiVos uses frequencies up in the satellite range (MoCA "D band") ...

Signal frequencies:

OTA: 54-806 MHz
cable (TV/Internet): 5-1002 MHz
MoCA (D band): 1125-1675 MHz
Diplexer passpand frequencies:

ANT (VHF/UHF) port: 40-806 MHz
SAT port: 950-2150 MHz
... allowing use of a diplexer for merging or splitting OTA & MoCA signals.

Some users have used diplexers to isolate OTA and CATV coax segments while allowing MoCA to flow between the segments through the diplexer "SAT" port (not needed by you, owing to the planned physical separation); to conserve OTA signal strength while delivering the antenna signal to a single outlet of a MoCA-enabled multi-outlet coax plant; or simply to split MoCA & OTA signals onto separate coax lines, at a slightly lower signal loss than would be experienced using a 2-way splitter, when each line only needs the associated signal.
In your case, you should be able to replace the 2-way splitter connected to the antenna feed with a diplexer, connecting the BOLT to the diplexer's IN/OUT port, the antenna to the diiplexer's ANT(VHF/UHF) port, and the coax line connecting back to the shared CATV/BB coax plant to the SAT port of the diplexer ... as shown in the attached diagram:

Schematic Rectangle Font Handwriting Parallel


NOTE also the placement of the "PoE" MoCA filters directly on the coax port of the attached splitter/diplexer, in order to maximize the performance benefit of the "PoE" MoCA filter.​

p.s. Preferred parts >here<.
 

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Discussion Starter · #4 ·
Thanks for the info, I think. After reading your response, I tried some reconfiguration and now the MoCA network just tanks. TV signals to the Bolt are now acceptable and provide quality, mostly stable viewing. I'll try and seek out a diplexer locally, but don't be surprised if you see a couple of Tivo Minis on eBay and maybe a Tivo Bolt +. I'm now off to buy a Roku stick and subscribe to Hulu Plus for Live TV (mainly for the sports channels)as I discovered the Bolt+ does not support live TV. What's the world coming to?
 

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TDL shepherd
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Thanks for the info, I think. After reading your response, I tried some reconfiguration and now the MoCA network just tanks.
You're welcome, I suppose.

The posted diagram showing the diplexer workaround should work; I can't guess why MoCA's now not working without any info on the actual changes made.

TV signals to the Bolt are now acceptable and provide quality, mostly stable viewing. ... but don't be surprised if you see a couple of Tivo Minis on eBay and maybe a Tivo Bolt +. I'm now off to buy a Roku stick and subscribe to Hulu Plus for Live TV (mainly for the sports channels)as I discovered the Bolt+ does not support live TV. What's the world coming to?
Do you have a 4-tuner BOLT or a 6-tuner BOLT+? If you have "acceptable" viewing from an OTA antenna signal, then it must be a 4-tuner BOLT*, so what is the BOLT+ reference? And the Minis should work fine once the diplexer workaround is in place.

* The BOLT+ (any 6-tuner BOLT, 6-tuner Roamio or 4-tuner Premiere) only supports digital cable w/ CableCARDs, not OTA ATSC digital broadcasts. Any 4-tuner BOLT would work in place of the "BOLT" in the diagram for the purpose of tuning digital OTA broadcasts.
 
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