Nasa Feed

[ryasch]

I'm using a DMX741U LNB with a 1.8m offset dish and an Omegasat 5701 Receiver, and I'm trying to receive the nasa feeds. I can get a scrambled picture with no audio, or i can get audio with no picture. Does anyone have any idea what i should do to fine tune this? On the signal indicator for the receiver Im getting 99% signal strength and 37% quality then it folds back to 36% strength and 0% quality and it just goes to those 2 sets of numbers over and over. If i adjust my elevation up or down i lose everything, if i adjust my azimuth east or west i lose everything, if i rotate my lnb right or left i lose everything as well. Any help?

 

[upnatm]

You haven't given us much to go on, please provide details.

Are you trying for NASA on 87w AMC-3/C? (linear, 4000 H, 28111 3/4)

For linear signals, don't insert the dielectric plate, it's for circular signals.

Is your receiver all set up for C-Band?

Are you aimed at the right bird?

Are you using a conical scalar ring with that LNBF?

Your LNBF is designed for "prime focus" dishes rather that offset, a conical scalar
ring is needed for conversion to use on an offset dish.

The 1.8m dish is rather small for C-Band, unless you've done some really good
fine tuning on the LNBF at the focal point. You would have better luck with a
larger, prime-focus (BUD) type of dish.


Once again, fill in the gaps, it'll be easier for us to help.

 

[ryasch]

Sorry, pretty new to the satellite game.

Was trying for Nasa on 87W amc-3 c 4000mhz 28.1115 3/4 FEC
Dielectric plate was not in the LNB
Receiver is capable of C and KU
I was getting other AMC 3 Specific feeds just not the nasa feed
Using a scaler ring, LNB Focal distance is mathmatically correct
Dont have the option of a larger dish this is the only one we have ( its for work)

I was finally able to receiver everything correctly, my Spectrum Analyzer was putting too much of a load on the receiver and causing it to fold back. once i removed the analyzer i was able to get everything no problem.

Now i use the spectrum analyzer to power the lnb and find the initial signal and then the receiver to fine tune it...a little slower but seems to be working very well

 

[wildbill47]

The dish is small for most "C" band satellites I use a 6' and 8' dishes and the 6' is even marginal on some birds. Using the best LNB will help. I did that on my 8' dish and made a difference.

 

[ryasch]

This might be a dumb question, but is there a way to find out "the lowest" elevation my dish can see at?.. for example, is there way to know if i cant pick up birds below 42 degrees elevation? Or is that just something that i find out through trial and error?

The reason i ask is because i can nail every satellite i need to that is 42 degrees elevation or higher so far but anything below 42 i cant seem to pin point. I'm wondering if its just too low in the horizon for my specific location.

 

[Mr Tony]

42 elevation on the dish?

you can go way lower than that. ON my 6 footer here in Minneapolis I can see down to 19 elevation in the winter (when the leaves are off the trees to the east)
I have a dish at 137W which is like 21 elevation here....works great

 

[FaT Air]

Won't the mount allow it to go below 42°? Seems odd, my CM 1.2's are marked to 8° but only get down to around 22° before the bottom of the dish hits the pole. I got one down to 6° elevation by putting the dish on the mount sideways for 30W. How about a picture of the dish, and maybe another of the mount?

 

[ryasch]

I can physically lower the dish to whatever elevation i want however once it goes below 42 degrees i cant find any birds east or west, something isnt adding up and im willing to bet anything its something im not doing right, i just cant seem to figure out what it might be. ive been able to successfully find and receive channels from:
83W - AMC9
85W - AMC 16
87W - AMC 3
89W - Galaxy 28
91W - Galaxy 17
97W - Galaxy 19
99W - Galaxy 16
101W - SES 1
103W - AMC 1

of course i need 105W - AMC 18 and this is the one i cannot lock onto. Ive tried following dishpointer.com, ive tried moving the dish by hand, tried moving by wrench. If i power the LNB with a spec analyzer, i see a big signal, but i cannot get anything to come through when using the receiver

 

[Mr Tony]

The receiver you have will not get anything on 105W

Most of the programming on there is subscription programming (Digicipher 2) and requires a 4DTV or equivalent
The NBC stuff on there is DVB-S2 and the Omegasat only gets DVB

 

[Anole]

off topic

Seems odd, my CM 1.2's are marked to 8° but only get down to around 22° before the bottom of the dish hits the pole.
I got one down to 6° elevation by putting the dish on the mount sideways for 30W.

I wanted to congratulate you on your ingenuity.
Interesting lawn-friendly mount, too! - :up
Must be a bear to aim, though.

 

[FaT Air]

105w - look for TP 11856 V 3548 (Macy's 4 - Slate ch. $), Something to aim for anyway.
Yeah, it's a temporary Lawn Mount that's kinda turned semi permanent. Now added a 83e on the second pole for 125W. No problem aiming either. Still working on a polar mount for the 2nd 1.2.

 

[phlatwound]

Off-off topic

I wanted to congratulate you on your ingenuity.
Interesting lawn-friendly mount, too! - :up
Must be a bear to aim, though.

Maybe like aiming a BV spoon?