Thread: 97w and 99w on a fixed dish

Greetings to all members. How would I go about installing two LNBFs on a fixed dish to receive 97w and 99w programming?? I have no prior experience with multiple LNBFs on the same dish. My development path was, I went from a fixed Ku dish to a motorized Ku dish. Now, my dad lives in a condo, and he doesn't want his dish motorized after he heard the noise from my SG9120 going from 30w to 125w He had enough hassles with the mgmt office to get them to approve the dish on his balcony, and afraid that the neighbors will complain about weird noises coming from his apartment after dark the stations he's interested in are on those two sats, so I think he can receive them without the motor. All help will be appreciated, as always.

Thanks,
Ben

You're pretty much not going to be able to do that, unless you cut the feedhorns down to enable them to be placed closer together. Even 4 degrees is tough to do with standard LNBFs.

What channels does he want to watch? Depending on how strong the signals are, you might be able to get some channels from both satellites by putting the dish halfway between them, but you certainly won't get all of them, and it'll go down a lot quicker in bad weather.

99W and 97W C band are too close. You may try 99W C band and 97W Ku band attaching the LNB by the side. Something that I did and it works is pointing 103W as main and them attached either one 97W or 99W on the side.

Originally Posted by carlospr43

99W and 97W C band are too close. You may try 99W C band and 97W Ku band attaching the LNB by the side. Something that I did and it works is pointing 103W as main and them attached either one 97W or 99W on the side.

Would it be practical to receive C - band on a condo balcony? If yes, what programs there are interesting? Regards, polgyver

Originally Posted by FTAer0024

Greetings to all members. How would I go about installing two LNBFs on a fixed dish to receive 97w and 99w programming??

There is no off the shelf solution for receiving satellites separated by two degrees. A SatelliteGuys member, Wescopc took 2 GEOSATpro SL1 LNBFs and ground down the case and scalar with a belt sander so they would sit next to each other close enough to receive satellites spaced 2 degrees apart. See thread: http://www.satelliteguys.us/free-air...ml#post1550517

As far as the noise produced from a HH motor running 2 degrees, it certainly would be a minimal low noise that would last for less than 1 second. I doubt that it would even be noticed. Now running the dish across the arc.... now that will take awhile and probably would attract attention!

a two degree seperation would be impossible on a fixed dish

Originally Posted by Mikey11

a two degree seperation would be impossible on a fixed dish

Evidently you missed the previous post?

Never say IMPOSSIBLE unless it is! LOL!!!

Two degree reception is possible when the scalar and feedhorn are modified. I have successfully modified two GEOSATpro SL1 LNBFs and mounted on a 90cm dish. Similar to Wescopc's modification, it just takes a measuring tape, a few power tools and some silicone sealant.

First, I mounted a SL1 in a single clamp with the left side of the clamp ground off. Peaked the dish aiming for 99w then removed the LNBF. Next I set the receiver to 97w and held the LNBF into the 2nd position to the left side of the clamp. Once the quality reading was peaked I measured the distance from the center of the 2nd position to the center of the clamp.

For the GEOSATpro 90cm dish, I believe the measurement was around 30mm from center to center. I started by grinding about 10mm from the inside of each LNBF. I continued to shave in 1mm increments off of each LNBF scalar until the Quality reading was peaked. Applied a bead of silicone around the scalar and feedhorn, cut the feedhorn covers and welded them together with a heat gun.

During additional testing I found that it wasn't very critical to keep the feedhorn at an exact 90degree angle to the reflector as long as the throat of the feedhorn was in the sweet spot. Seem to recall that there was approximately a 10% drop in Quality readings, but still provided ample threshold .

Originally Posted by SatelliteAV

Evidently you missed the previous post?

my answer was based on the original posters information and experience (or lack of it, no offense intended)....

when he makes a comment like this....

I have no prior experience with multiple LNBFs on the same dish.

im not going to start recommending or advising him to modify and hack away at his LNBs....he needs to learn to walk before he can start running....

i do however appreciate your post, it is good info to know....

Mikey, no offense taken

Brian - thanks for your detailed replies! I will attempt to accomplish this in the coming weeks.

Originally Posted by Mikey11

my answer was based on the original posters information and experience (or lack of it, no offense intended)....

when he makes a comment like this....



im not going to start recommending or advising him to modify and hack away at his LNBs....he needs to learn to walk before he can start running....

i do however appreciate your post, it is good info to know....