Amazing what you can make out of an old milk bottle..lol
Currently, I have a Chinese LNB and a Titanium C1 LNB, but neither is compatible with the mounting bracket located on the sub-reflector of my antenna.
I do not think any LNB models will be compatible in your case. You will probably need to think out of the box and make a custom mounting system. Could you show a couple of pictures of your antenna?
You are doing correctly with that custom LNB-holder for Ku-band LNB. Do similarly to mount C-band LNB. Make sure LNB's phase center is co-located with antenna's focal point. Do you have possibility to measure the length of 2 yellow lines? And also the leaning of the face of the antenna?Where in Europe are you located?
The SUB, of course, plays an important role in the reception, but not so radical, it is more important for X-pol and side-lobes elimination. But LNB proper placement plays an even more important role in the reception. For perfect antenna tuning, you better use your due-south satellite, which is EUTELSAT 21B @21,5E with elevation for Belgrad 38,4*, so, the leaning of the face of the antenna must be ~15*. And when you have perfectly placed LNB, then you can move to other satellites, just do not forget to adjust LNB-skew accordingly.
Hi Nelson, do you have a C-band feedhorn for the CM? I'm wondering if the one in the picture above would fit mine. First of all, I’m not sure if it would fit into the mount on the sub-reflector.
Hi - The C band feeds i,v used are just the - Blue - stepped / cone feeds that can be bought various places online ... but i,v not used them together with the sub - reflector - as it would mean cutting the original k/u holder assembly ( something i did not want to do ) ....I,v not had the opportunity to experiment much over the past few years unfortunately, for a number of reasons .. I,m currently using the sub and and an Invacom quad l.n.b.
I'd agree with Nelson, I had a sub on a Channel Master 1.8, little if any difference than pointing the LNB directly at the dish.
The wheel was made by another member some time back, but yes, the other bits of it were my own concoction..
I,v never had the type of unusual results you describe ... except when i was experimenting with a AV- comm polariser for C band ... Had issues like that with the AV - comm that never got resolved
but the wide spacing of the c band l.n.b,s reduced performance in C band to that of a 1.8 m dish .... plus it was a bit fiddly re the receiver positioning between linear or circular satellites ... and quite a bit of elevation adjustment (motorized ) was needed at the arc extremes . other wise it worked well despite the C band limitations .Great solution, I’ll do the same for the C band. I’ll post pictures soon. Thanks for the idea. Could you take detailed pictures of the movable mount, since we have the same antennas, so I can use them to make a similar polar mount?
You could if budget is tight, fit any C band LNBF at the true focal point of the reflector, and work out a way (motor or manual), of dropping the subreflector out of the way when Ku is not viewed.
Hi - janixxx:
