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Yes, this is not a different mold of the reflector. I also do not think that manufacturer made this Frankensteined design. Why should they? Perhaps, one of the first owners lost original feedarms or got the original plastic LNB-holder and decided to attach feedarm from another antenna. The...

Interesting! Could you post some pictures of that notch? Is there a stamp on the back of the dish with the mold number? And what kind of LNB-holder this dish had?

Is that the original Channel Master antenna feedarm? If not, are you sure the LNB is in tight position?

I like universal solutions, like on the pictures. It is possible to install C or Ku band LNB in the focus. It is also possible to move scalar closer/further from the dish and to adjust multifeeded LNB fully independently. But, of course, any solution is good when it helps to achieve needed results.

ILoveSats Nice catch, congratulations! Channel Master also has the polar-mount for antennas up to 1.2m. But, in your case, if you wish this antenna to be installed on Diseqc motor, then, yes, you will need to fabricate something, as there is no ready solution available.

Of course, conical scalar is needed for LNB when used on offset dish. Flat scalar when the same LNB is installed on PFA. If flat scalar is used on an offset dish than it will overilluminate ( see much more than entire dish surface). Is not this the case you meant by saying word "otherwise"? In...

Did you mean that it will see much more than dish surface, including lots of ground noise?

First double reflector toroidal dish was presented in March 2003, and that was T55. T90 came a while later. They also had plans to make T120 but never make it. Anyway, T55 and T90 were most popular in Europe. Even now people are eager to have this nice piece of equipment. Some time ago I was...

Captain Midnight T90 was my first satellite dish ever and I liked it a lot. Yes, you need patient to tune it. I would say, do not correct it, just install it as it is and try to catch as many satellites as possible. As far as I know, you do not have so many Ku-band satellites available in USA.

Usually, any satellite receiver has possibility to show signal levels. Install one LNB and look what signal level is, then install a second LNB and look for signal level again, and so on. Afterward compare results and install LNB which gave you the best signal level (performance).

The easiest way is to install them one by one on your antenna and see which gives the best performance. Actually, this is only one way how to do comparison, at least what I am aware of.

Make a new one, or 3 of them! But make sure that the arms and LNB-holder position the LNB in the way that it 's phase center co-located with the antenna's focal point.

This is the tool I made many moons ago. It fits for purpose perfectly.

If you do not stick to the plastic one, you can make adjustable, something like this

I have one for 40mm LNB. You can get it for a price of shipping.

Ups, you have way better memory than me :shh

Speaking about water-test. There is one I made on Equatorial dish. As far as I remember, it took about 10 liters of water.

Yes, first T55 was introduced March 2003 (20 years ago). But not North Korean specialists, but from South Korea. Production was organized in Taiwan. There are several true multifocus (single mirror) antennas, for example Swedish SMW-OA-1600 or Equatorial. I have both of them, great dishes IMHO...

I've made it after seeing your problem. Actually, it is more or less common issue when LNB should be installed and adjusted on a round feedarm (usually it is around 1" in diameter). Start from any universal LNB.

Install something like that, then you will have full flexibility adjusting LNB. And when you find out where is the focal point of the antenna, you will be able to adjust LNB in such a way that it's phase center is co-located with the antenna's focal point.

I think you should start from dismantling and cleaning. And then you will probably see if something is broken there.

I see! So pats , make a couple of useful posts!

Can you post some pictures?

Currently, there is 1.8m Channel Master installed, but if I had 2.4m antenna that would certainly easily fit on the same pole. The base is about 1 meter deep and holds almost 1 ton of cement. And anchor-bolts (as on your picture) are used. I think it is possible to make the same type of mount...

So, where is the problem, then?! Just make the mast removable and with adjustable plumbness, like I have made in several installations.