Is there a good schematic

[comrev]

I feel I am reasonably literate but I am not able to get both OTA signal and satelite signal to TV2. I can get one or the other but not both. My OTA is Comcast Cable, channels 2-72. I have a VIP622 and the Modulator set w/TV1 out (off) and TV2 out (cable) channel (73).

I need to understand how the 622 handles signals. Is there a clear simple schematic that shows the cabeling from the dual LNB to the receiver, how to wire from the receiver to TV2 and what diplexers/switches/splitters are needed to allow my wife to see channels 2-72 for her local stuff and select channel 73 and use TV2 remote to view satelite channels?

I know it will work because, until I had to replace my receiver it worked. Unfortunately, the neighbor who swapped the receiver for my wife, didn't label the wires and I expect the are crossed somewhere.

[coldsteel]

Just run the feed from cable into the same room as the TV2, then combine the feed from the satellite receiver and the cable through a splitter to the TV.

[comrev]

Thanks coldsteel. But, my TV2 has only one input. I want to send both the Satelite signal and the OTA signal through to same RG6 cable. It worked before but now I get a very weak OTA signal.

I am coming out of the Home Distribution (channel 21-69) into the UHF/VHF side of a diplexer, and a splitter of the signal directly from the LNB is connected to the satelite side of the diplexer. A single coax goes from the diplexer to TV2.

I have the combined signal fron the 2 LNBs coming into the house. The RG6 cables goes into the input of a 950-2150 Mhz, Dish separator. The outputs are connected to TV1 in and TV2 in respectively.

Now, do I connect mt OTA to the TV Antenna/Cable In? What signal(s) come out of the Home Distribution (channel 21-69) connection? Does the receiver add the OTA signal and the TV2 signal and deliver both sognals through the Home Distribution (channel 21-69) connection?

I think I just don't understand the logic used by the receiver. I there are three signals (LNB1, LNB2 and OTA) going into the receiver, where do the signals leave the receiver to get to TV2?

Sorry if I am not explaining myself very well. This is a first attempt for me at trying to understand the signal distribution. I someone could direct me to a research source, I will be happy to try and learn form such resources and not waste the time of member of this forum.

Thanks!!

[scooper]

If you are using cable for local channels - you can ignore the OTA in on the 622.

So at the 622, you have a cable coming from the dish /to TV2 location (through the diplexer) and another cable that is from the cable company.

Use an RF combiner on the TV2 output of the 622 to join the cable signal and the TV2 output. Set the TV2 RF output modulator to CABLE , select a channel at or above 75.

Caveats - this will only work if there are no signals AT ALL from the cable line above channel 73. Otherwise - run a separate line for the cable to the TV2 location and use an A/B coax switch to switch between sources. This is probably the best solution in any case.

[comrev]

Thanks scooper! I will give it a try.

[harsh]

Comcast cable is NOT OTA. You would do well not to confuse them.

There's a certain danger in using CATV because even if a TV channel doesn't appear to be there, the frequency may be being used for something else (HSI, voice or QAM).

We need to know all about how the distribution signal currently gets from the ViP622 to TV2 to assist you efficiently. If you have anything labeled as "diplexer" in your system now, you need to stop, take a deep breath and possibly go a different route altogether.

[scooper]

Comcast cable is NOT OTA. You would do well not to confuse them.

There's a certain danger in using CATV because even if a TV channel doesn't appear to be there, the frequency may be being used for something else (HSI, voice or QAM).

We need to know all about how the distribution signal currently gets from the ViP622 to TV2 to assist you efficiently. If you have anything labeled as "diplexer" in your system now, you need to stop, take a deep breath and possibly go a different route altogether.


Exactly why I suggested the "multiple cables with A/B coax switch route".

[comrev]

OK harsh, thanks for replying. I understand the technical difference between over the air (OTA) and cable but the nomenclature in most of the Dish literature I have read kind of lumps any signal other than a satellite signal as OTA. BTW, I didn't take offense because I am sure you meant none. I sometime find it difficult to "keep it simple" without making a few technical misstatements.

Regarding scooper's reply, I did as he suggested. I changed the diplexer to a signal combiner. Additionally I changed the TV2 Modulator on the receiver to channel 77 and the signal on channels 13-72 of TV2 improved considerably, but still poor. Channels 2-12 are barely viewable. But the satellite signal on channel 77 was Great! I swapped the inputs on the combiner and the lower channels were great and channel 77 had a snow "storm."

Now with that information, is there a way to boost the cable signal or is the problem related to sending the cable and satellite signal on the same coax?

I will likely resort to the A/B switch but my "Tim the Toolman" mentality knows it can work. . . so I will continue to try to get an acceptably viewable image of both satellite and cable through a single RG6 cable.

Any additional suggestions will be appreciated.

[BattleZone]

First, OTA is not cable. OTA = over the air. There are a number of significant and important differences between the signals you can get OTA and the signals you'll get from cable.

Second, the TV2 signals and your cable signals are in the same frequency band, so they can't share a cable. Diplexing means to combine two DIFFERENT frequency bands and be able to separate them again.

If you want OTA or cable signals going to your TV2, you'll need to run a separate cable and use a switch box.

Note that hooking your TV2 up to cable means you will be backfeeding the TV2 signal into the cable system, which will cause interference and probably get your cable service cut...

[scooper]

No - you LEAVE the diplexer in place !! You also leave the Dishpro Seperater in place - and this goes into the diplexer's SAT in port.

If you combine, you combine cable and TV2 RF output BEFORE the diplexer OTA "in" port.

[scooper]

First, OTA is not cable. OTA = over the air. There are a number of significant and important differences between the signals you can get OTA and the signals you'll get from cable.

Second, the TV2 signals and your cable signals are in the same frequency band, so they can't share a cable. Diplexing means to combine two DIFFERENT frequency bands and be able to separate them again.

If you want OTA or cable signals going to your TV2, you'll need to run a separate cable and use a switch box.

Note that hooking your TV2 up to cable means you will be backfeeding the TV2 signal into the cable system, which will cause interference and probably get your cable service cut...


You're exactly right here - you might be able to get away with combining if you add some low pass filters to keep cable away from the modulated TV2 output (and vice versa). But the separate cable with A/B switch is really the best answer in this case.

Another variation on this would be to have another cable tuner at the TV end, and use A/V inputs. A VCR with a compatible tuner (either OTA and/or cable) can do this just fine. Assuming the TV2 has at least one open set of a/v jacks, of course.

[comrev]

Thanks BattleZone and scooper. A/B switch it is.

[jarvantgroup]

If you're still getting snow, increase the tv2 modulator channel #. Take it up to the 80's or 90's. I've done this on several occasions and depending on which channels your local cable company utilizes you have to go to the upper range of Dish's tv2 channel range. Even in the 100's. As scooper said, an a/b switch or even a second line would be ideal, but it seems like you'd rather not deal with that option. :icon_cool:icon_cool:icon_cool

[dragon342]

refer the dish website tech.dishnetwork.com

[jsk]

1. Get a notch filter for CATV channels 75-80 (click here for Google shopping results (http://www.google.com/products?rlz=1T4DMUS_enUS295US295&q=notch+filter+nf-471&um=1&ie=UTF-8&ei=OCOwS-2NK4KC8gam9qzdCw&sa=X&oi=product_result_group&ct=title&resnum=3&ved=0CCEQrQQwAg)).

2, Set the 722 to a CATV channel between 75 & 80.

3. Use a splitter to combine the CATV signal with the TV 2 output on the 722.

Here is the diagram with a cable modem (if you don't use a cable modem you can leave out the first splitter).


_________
CATV line | |-------------|Cable Modem|
----------|Splitter | ________
| |-|Filter|-------| |
|_________| |Splitter|----To TV(s)
-------------------------------------|________|
722 RF out

[comrev]

Thanks jsk I appreciate your solution. I will order my filter today.

Ray