Welcome to GOFASTMOTORSPORTS.com ... ... ... Green Flag - Green Flag - Go Go Go ... ... Brought to you by Ricks Satellite - Where the Big Dish Rules!

Ricks Satellite Wildfeed and Backhaul Forum
Register Latest Topics
 
 
 


Reply
  Author   Comment   Page 2 of 2      Prev   1   2
RimaNTSS

Registered:
Posts: 339
Reply with quote  #16 
Each antenna has Focal point and each LNB has Phase center. The trick here is to co-locate Phase center with Focal point. But to do that we should know exactly where they are located. As it was mentioned before it is not easy to locate Focal point by signal strength (I would even say that it almost impossible). When you do the measurement from center of the dish to the body of the LNBF it makes no sence as LNBF's Phase center is not located on the physical body  of it.
RimaNTSS

Registered:
Posts: 339
Reply with quote  #17 
Could you put a mark on the picture from your post #11 where do you think LNBF's Phase center is located? And can you do the same on the picture from your post #1?
WISCOM

Registered:
Posts: 66
Reply with quote  #18 
Quote:
Originally Posted by RimaNTSS
Could you put a mark on the picture from your post #11 where do you think LNBF's Phase center is located? And can you do the same on the picture from your post #1?

Ok from your center point to the end of the lnbf/dish side is 31 1/4 inchs,mid arm to lnbf is the same as your 28 1/4 inchs.so im about where I should be ?

__________________
1.2m offset Ku .7 Ku LNB,1.2m L-band RHCP,90CM Ku.
12 el UHF cross yagi RHCP Meridian sat.
RimaNTSS

Registered:
Posts: 339
Reply with quote  #19 
Quote:
Originally Posted by WISCOM
Ok from your center point to the end of the lnbf/dish side is 31 1/4 inchs,mid arm to lnbf is the same as your 28 1/4 inchs.
End of the LNB is not its Phase center.
Quote:
Originally Posted by WISCOM
so im about where I should be ?
Probably yes, you are. But how close you are to the perfect position is a good question. I wold say, you are several centimeters from perfect position. How much you are off only you can tell after you do precise measurements and compare to the digits from my collage. If you had digital inclinometer you could do the test to determine whether LNB is properly installed.  
WISCOM

Registered:
Posts: 66
Reply with quote  #20 
Quote:
Originally Posted by RimaNTSS
End of the LNB is not its Phase center.
Probably yes, you are. But how close you are to the perfect position is a good question. I wold say, you are several centimeters from perfect position. How much you are off only you can tell after you do precise measurements and compare to the digits from my collage. If you had digital inclinometer you could do the test to determine whether LNB is properly installed.  

Very true and will keep tinkering with it this weekend.Thanks for the help.And I will keep you posted.

__________________
1.2m offset Ku .7 Ku LNB,1.2m L-band RHCP,90CM Ku.
12 el UHF cross yagi RHCP Meridian sat.
Captain

Registered:
Posts: 2,843
Reply with quote  #21 
Quote:
Originally Posted by WISCOM

Yes either a mod-ed mount on new arms,shorter once I find the sweet spot



the sweet spot has already been found by Channel Master engineers, instead of going threw all that work why don't you use you're same feed horn from it  and bolt a W-75 flange ortho on to it or if you want a lnbf just get a C-120 flange lnbf.
Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.

Fellow Members, your posts are welcome here! Do not worry about posting everything perfect. Different receivers and LNB's will give you different Frequencies and Symbol Rates. Some set top boxes, PCI cards and USB receivers, Do Not Require all of the same information that others may need. It is not Required to post everything that others may need to tune in a feed. It is just most important to share the find. We can always adjust the Frequency and Symbol Rates and try the various Modulations and FEC's on our own receivers until we get a lock and then give a polite reply with what works for your receiver, as that information might help others as well. We all appreciate the efforts and energy of the Posters!

Thank You for Visiting GOFASTMOTORSPORTS.com - Keep Your Eyes on the Sky and the Track!