This holiday season, just for fun, I will try installing some old C-band LNB on my experimental 1-metre fixed dish. I too would like to catch Anik F1R at 107 since it has some good tps.
I think you will enjoy this project. It was a lot of fun for me to put different C band lnbs on a 1.2 meter offset dish.
Here are a few things to look for or to think about while doing this project:
1. Water or moisture will be your biggest enemy.
A lnb that is designed for an offset dish will have a sealed feed horn. The lnb on an offset dish tilts up so water will enter the lnb feed tube and cause moisture problems. A C band lnbf is not sealed, so moisture will eventually give you problems no matter what you do to try and prevent it. The only way to keep moisture out is to effectively seal the c band lnb feed tube. This is easier said than done!
2. Scalar rings are optional.
There is not a known C band lnb that has a feed tube long enough to support a .6 FD ratio dish. Most C band lnbs are marked to around a .44 FD ratio, so the tube is not near long enough to support a .6 or greater FD ratio.
The FD ratio for my 1.2 meter dish is .5. I always had the scalar ring all the way at the far end of the feed tube on All tested C band lnbf's. I could never get the signal to peak by moving the scalar forward on the feed tube. Adding another 3 inches of feed tube on the c band lnb would have probably helped or at least allowed me to peak the signal on my dish. I found some transponders to be stronger on some satellites without using a scalar ring or feed horn. Other transponders on some satellites would not lock without using a scalar ring.
3. Do not adjust the dish
Installing a lnb on your dish does not change or move the positions of the satellites in the sky. It may appear that the dish needs to be raised or lowered when you install a C band lnb on a small dish, but in reality, the lnb is not mounted in the correct spot on the dish. If the dish is tracking the arc correctly on the Ku band, then do not adjust the dish on C band, else the dish will not track the arc correctly expect for maybe a select few satellites!
Attached is a picture of a sealed feed horn. Anything short of a complete seal of the lnb feed tube will eventually give you moisture or condensation problems! EB