I know you won't get 119 and 121 on the same dish without modification to the LNBF
I could get 119/123/129 using a Geosatpro bullet LNBF.
However 119 suffered as it usually was out of focus.
In the picture attached, 119 is missing but it was on the right of the large feed horn jammed tightly.
I can't seem to find any pictures of my 129/123/119 setup.
Wescopc needed a 1.2 meter and still had to shave 5mm off 2 Geosatpro LNBF to get 123/125
I haven't messed with fixed dishes for a bit to try getting TC8PSK with an offset 119 LNB
The other catch with the Starband 129 kit pictured above is that the DishNet LNBF have rectangle mounts and are considered legacy. The bracket holding them up would not take DishPro LNBF.
I'm worried you have more than one receiver
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Re-reading your question again, you are asking about setting up the Starband 75e for only DishNet, and trying to pick up 110/119/129 adding 121W where possible.
If I had the 121 SuperDish LNBF I'd say you could get really close.
But just picking up 129/119/110 should be a breeze on that dish.
Items I'm assuming you're using.
- DishPro dual-tuner receiver
- 3x DishPro LNBF
- DPx4
- Starband 75e without Tx/Rx assembly
I'd remove the plastic housing from what will be the 119 LNB.
If you are worried about looks (from the street), you will need to saw off the plastic surrounding the throat. Not the Feedhorn cover, though. Think about this further you will not want to remove more that the bottom half of the throat cover. This will prevent the feed from rotating and give an almost even height for the other 2 LNBF
Using some metal strap like conduit-hanger, place and strap down the 119 LNB where the original feed horn went.
Attaching the other 2 LNBF will require some thought as to how to do it and make it look nice, if need be.
If it just needs to be funtional, whip out some zipties and strap the LNBF to the 119 LNBF at least once on the back. You may need to use a "thin" inflexable bar to strap the tops of the LNBs to.
One more thing- both the 110 and 129 will need to be slightly higher than the 119 LNB
Finally Skew the dish when setting up.
Dish pointer will have the 1000.2 setup option under "multi LNB" if you need a little help on how much skew to give.