Yes, a fixed dish will function on the mount as you have all the moving parts on the motor.
You need to have a suitable backing ring to connect the two though, most manufacturers do not recognise another make of motor, so it may be that you have to use the services of a local ironmongers/metalworking company
When connecting an offset dish the backing ring can simply be a flat plate of steel with some holes and bolts. On a prime focus dish the ring has to be spaced off the dish as its a convex surface.
Fixed 1.8m dish from Prodelin is the 1183, Channel Master is the 184 series
ok, so now I'm wating for datasat.de to reply for the motor. He said thet it coms with several adapting plates (prime focus online, though). Besides I read at an italian website that it's compatible with Irte dishes.....dunno about Prodelin dishes. At worst I'll make a welder make something to adopt it. I've emailed to Prodelin and they promptly replied. They said my request has been forwarded to the german representative. He should contact me soon. Now if they reply and the price isn't outrageous I'm getting it. I'm afraid it's gonna be expencive because of shipping. Should it be too expencive I'll order the Irte on Jan 7th (that's when Irte in Milan opens...closed atm).
What I want to receive? Well, up until a few weeks ago I had a 3mt KTI mesh dish. I had to uninstall it though. It looks like the wall it's been anchored to for months isn't that solid. I mean....it's possible that it would have never collapsed but that wall isn't mine. That measn that I now have a 9cm pole which is quite solid. considering a 180cm dish is a lot lighter than that 80kg Kti I shouldn't have any problem. I'm getting a 180cm cuz at least in Ku band (the 3mt was meshed and didn't have so astonishing performance in Ku band)I wanna have the same performance (or maybe less but still not that far from it). I'm not asking for anything as for C band....maybe just those very very strong beams. Anyway, I don't have really big ambitions.
I can confirm that a high quality 1.8 -2.0 mtr will generally provide good results on c band the primary exceptions will be on the global c band beams.
Please note that while the IRTE is light this is also equally a problem when the dish is subjected to windy conditions, along with the petal construction, this often results in some flexing of the dish surface this reduces the effective gain of the dish.
This is one of the primary reasons for the reccomedations you have seen earlier.
The ku band performace can be improved by removing the 90 degree Elbow and fitting the lnb directly at 90 degree to the corotor (out of the side) the gain achieved is around 2.0-3.0 db this is a direct result of reducing the path of the signal to the lnb 12 ghz signals do not like to be bent 90 degrees! the additional area of the lnb is very small with most newer lnb's and the gain / versus loss of recieving area of the dish masked by the lnb is very small.
you can also fit the ADI corotor whcih has an additional gain in both c and ku of around 1.0 db as a result of the cast in dielectric plate.
It is quite possible to achieve simlar performace to the KTI in KU band with a high quality solid 1.8 , the c band will be weaker however.
Its fine to remove the elbow (no probe, just a waveguide) but since the bolts holding it together are soft material with a funny secure locking head , plus painted with the rest, you may have trouble removing them on a second hand unit which has seen action.
Additionally you will have to drill out the holes to remove the threads, ready for the LNB bolts
Cal Amp are always good, however they have discontinued the older full band version, so what you have is probably the last of the line, dont drop it.
The Corotor is probably the most lossy part of the system and if you do get an offset dish, be aware that the feed horn end will be sticking upwards (unless you install the dish upside down), and will let in water
I would seriously look at fitting the Ku LNB on its own high efficiency feed (the one designed to work with the final dish choice) and stick the C band LNB to one side of the Ku feed