fd ratio

[danristheman]

What is the ratio on a andrew 1.2 meter dish? I am working on 99w c band mini bud.

 

[primestar31]

Since that's really a ku dish, I tune in the ku signal on the sat I'm interested in with it's regular ku lnb, THEN swap in the c-band lnb (without the conical scalar for now), and tune it the best you can on the strongest signal. Once you got that done, then install the conical scalar and tweak it for best signal and quality.

I've never calculated the f/d ratio on an elliptical dish, and I wouldn't bet it's an easy thing to do. Setting it up as I describe above is really the best way off the cuff to do it.

 

[FaT Air]

Equivalent F/D is around .6. (plus/minus a decimal point or two)
Parabola Calculator 2.0 (use the WIFI tab for offset dishes)
Agree with primestar on the 'setting it up' procedure.

 

[danristheman]

I had to make a custom mount for c band lnbf converting to c band from ku. I can line spot on but I am having worst lust with krbk that is the I want to watch. In way I had better luck with the 1 meter than te 1.2 meter dish.

 

[RimaNTSS]

What is the ratio on a andrew 1.2 meter dish?

If Andrew 1,2m = Channel master 1,2m, than it has F/D ratio 0,6.

I had to make a custom mount for c band lnbf converting to c band from ku.

Could you show some pictures of your job, please.

 

[danristheman]

Here are some of the pictures.

 

[danristheman]

It was also a ku tx and rx dish. Yes it is a channel master.

 

[primestar31]

On a Channel Master dish with the 3 arms, any c-band lnb is going to sit high compared to a ku lnb because the arms interfere. You have to re-engineer the arms the allow it to sit lower, so it's centered in the beam.

 

[RimaNTSS]

As I found out recently, CM feedarrms and LNB holder designed in such a way than LNB is located not in antenna's focus and also not pointed to the proper point on the surface of the dish. So it is not so necessary to to place C-band LNB exactly the same way as Ku-band LNB was installed.