Could be lots of things. Dish got knocked out of true south orientation, failing lnb, poor connectors (signal attenuation), skew off (polarotor failed/misaligned), trees/limbs, but you are getting something, and that's a start. There's not a lot of analog to use for 'beacons' that is continous broadcast mode anymore.
Try this. This is just an exersise. It will let you start out to play on C band w/your CNX. There is lots of other stuff on the other sats too.
Using the analog IRD, drive the dish to 121W (T7/Echo9/Gal23)
Go to ch 21. You should see ACN (jewerly channel)
Tweak skew and dish position fine tune to get best pic/signal
Find the sat/antenna setup menu page in your CNX.
Find the entry for 121W. IF you dont have that one any other one can be config'd for the desired settings, it will just have the wrong name.
Input the following settings:
LNB type=single
LO=5150
All switches, DiSEqC, 22khz, tone, sw21/sw42, etc = off or disabled.
Save and exit.
Power down both receivers. Remove the coax feed from the analog and put it on the CNX sat/dish/lnb (or what ever they call it) in connector.
Go to channel setup page or equiv.
Select the sat you just set up (121W)
Find an option that says blind scan, smart scan etc.
If you have a selection for H, V or both, select H, (for now). That will speed up the scan.
Begin scan.
Allow the unit to scan all freq/SR combos. May take several minutes.
Ch 21 is horizontal. If working properly, the polarity is set by the C band IRD, and all you can pick up while on ch 21 is H signals.
When the scan is done switch to ch22 which is vertical, this time set to CNX to scan V only and re-blind scan again.
You should pick up lots of stuff in various languages, several in english.
This should give you a taste of how FTA operation works.
Now, you need a list of what to expect to find (digital) for the rest of the sats. "The List", maintained by board staff, is found on the link at the top of the page. Another good C band list can be found here.
http://www.global-cm.net/MPEGlistCBandUS.html
There is a Ku list on this site as well, when you get ready to play with Ku.
Linear Ku LO for a standard LNB (99.9% of western hemisphere linear signals) is 10750
That ought to keep you occupied for a while.................
Welcome to the hobby!