Help needed with Super Home Node and Agile Modulator Backfeed

[kozmocat]

I have the same configuration as the diagram from the link below, except that I have a DP Twin connected to a DPP44 switch instead of the DPP Twin.

http://www.solidsignal.com/dishnetwork/DISH_Pro-DISH_Pro_Plus_Diagrams/DistributionExample8.pdf

I have analog Cable TV, just the Basic Broadcast service so I can get the local village and college broadcast channels. A few of the regular cable channels also come through (apparently they can’t filter these out.)

Everything is working, but the picture on the Agile Modulator Backfeed is a little snowy. The cable channels are clear. If I disconnect the home node and run the Agile Modulator Backfeed straight to a TV, the picture is crystal clear. I tried using different channels but the only ones that come in at all are 81-83.

What am I doing wrong?

 

[sunnyday]

I'm having the same problem on my 322 except I am only getting channel 75, with a ton of snow. Did anyone ever figure out a solution to this?

I have it hooked up just like in the diagram below, except instead of using diplexers I just ran another line to sat input 2 from my dp34. My dish is a 500+.

http://www.solidsignal.com/dishnetwork/DISH_Pro-DISH_Pro_Plus_Diagrams/DistributionExample4.pdf

 

[sunnyday]

Hmm, this is interesting. I temporarily disconnected the CATV input on my super home node, and suddenly my TV2 feed works perfectly (minus the cable channels of course). However, once I hooked my cable TV back up, TV2 returns to being a snowy mess.

 

[bhawley]

You are running into digital signals on the channels you tried. Try Ch.112-124.

 

[sunnyday]

I tried every single possible channel, and only 75 works (which happens to be sandwiched between two analog channels). I can kind of make out stuff on that channel, but there's snow all over and it's not very watchable.

 

[rglore]

You will need to buy a trap to eliminate some channels from the cable feed so as not to interfere with the receivers modulated output.

 

[bhawley]

What rglore said: ChannelPlus Structured Wire, RF, Music, S-Video Distribution, Cameras, IR Systems

 

[sunnyday]

What rglore said: ChannelPlus Structured Wire, RF, Music, S-Video Distribution, Cameras, IR Systems

I'm not sure that solution would fit my needs, because I am receiving cable channels on 70-74 which I would like to keep. Plus, that NF-470 is a little too much out of my price range.

Would I be able to get away with using a low pass filter instead?

 

[Agonizing Fury]

The problem you are experiencing is the noise on the cable system is being amplified by the super home node right along with the actual cable channels. In the box that your dish receiver came in there should be a signal attenuator (it will have a label on it saying only to use it for TV2 in certain situations). try installing that on the cable input side of your super home node. This may bring the noise from your cable down enough that your TV2 feed will clear up. Hopefully, it will not bring down the quality of your cable signal too significantly. I have had the best luck with cable channel 116 - 120 for most people that I do this for. If that doesn't work, try using a splitter to join the two feeds together (instead of the super home node), or a cheap radioshack amp on the TV2 output from you receiver to try to amplify the signal from your receiver above the cable noise. Good luck with it.

 

[bhawley]

I'm not sure that solution would fit my needs, because I am receiving cable channels on 70-74 which I would like to keep. Plus, that NF-470 is a little too much out of my price range.

Would I be able to get away with using a low pass filter instead?

Channel Plus NF-471 Notch Filter Blocks CATV Channels 75 - 80 and UHF 24 Creates CATV 76 - 79 NF471 1 Pack In-Line Notch Filter Coupler Barrel Adapter, Part # NF-471: Oak Entertainment Centers and Home Office Furniture, TV Antennas, Audio/Video, Sate

 

[Mike_H]

In summary,

When trying to inject channels onto a cable using RF and seeing interference, you will need either a Low/high Pass filter, or a Notch Filter.

A notch Filter can be purchased to create a "Notch" in the RF signal blocking a specific frequency so that you can insert your own signal at that point.

A low pass filter is less selected, and will filter out all RF signals above the the pass band . This allows you to insert your own signal at that point and above.

If you are modulating multiple channels, and your Cable TV signal is only using lower channels, then a low pass filter may be best.

If you r are modulating one or two channels, and your cable TV signal uses a wide band, you may do best with one or two notch filters to carve out a couple channels for you to inject your modulated channels on.