Prime focus Ku ONLY LNB

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hotsat9
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Joined: Thu Jan 18, 2018 11:11 pm

Prime focus Ku ONLY LNB

Postby hotsat9 » Sun Jan 28, 2018 7:20 pm

Can anyone recommend a Ku ONLY LNB for a prime focus dish? I would like to run some Ku tests comparing the signal strength differences of a 6ft mesh prime focus vs a .96m offset Ku dish.

Im curious if some frequencys will do better on one dish or another.

Also curious if one dish will respond better than the other in hot signal areas. Also curious if one dish will respond better than the other in fringe signal areas.

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owhite47
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Joined: Sat Jan 13, 2018 2:10 am

Re: Prime focus Ku ONLY LNB

Postby owhite47 » Mon Jan 29, 2018 9:23 pm

I would supect that the mesh would degrade you signal so that you wouldn't see any improvement at all........Just a guess

STRETCH
Posts: 108
Joined: Mon Jan 09, 2017 2:31 pm

Re: Prime focus Ku ONLY LNB

Postby STRETCH » Tue Jan 30, 2018 3:44 pm

You could try a INVERTO ULTRA SINGLE BLACK, the dia. is only 40mm, you may have to mod your dish for this LNB to fit.

DEN

Cornhusker
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Joined: Tue Jan 23, 2018 11:44 pm

Re: Prime focus Ku ONLY LNB

Postby Cornhusker » Tue Jan 30, 2018 11:05 pm

What is the f/d of your prime focus dish? Most offset lnbs are usually made to illuminate an offset with a f/d ratio of .6.

Cornhusker
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Joined: Tue Jan 23, 2018 11:44 pm

Re: Prime focus Ku ONLY LNB

Postby Cornhusker » Wed Jan 31, 2018 3:42 pm

http://www.linkboxusa.com/pf7900u.htm Here is a lnf made for a prime focus reflector.

hotsat9
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Joined: Thu Jan 18, 2018 11:11 pm

Re: Prime focus Ku ONLY LNB

Postby hotsat9 » Fri Feb 02, 2018 10:50 pm

My prime focus is 71" wide x 24" deep

Ill see if I can get my hands on a linkbox LNB

Satman43
Posts: 21
Joined: Fri Feb 23, 2018 8:01 am

Re: Prime focus Ku ONLY LNB

Postby Satman43 » Sat Feb 24, 2018 6:41 am

hotsat9 wrote:My prime focus is 71" wide x 24" deep

Ill see if I can get my hands on a linkbox LNB
have you come to any conclusions yet?? I have ran similar tests on a c/ku setup on a 10' big dish vs an offset small dish and a prime focus small dish

oscar2873
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Joined: Mon Feb 06, 2017 5:56 am

Re: Prime focus Ku ONLY LNB

Postby oscar2873 » Wed Apr 04, 2018 1:18 am

If you need a standard ku lnbf for prime focus you can buy the GEOSATpro SL1P SINGLE STANDARD 10750 with 60db gain and 0.6 noise figure, if you need a universal ku lnbf for prime focus recommended the Golden Interstar GI-209P with 60db gain and 0.2 noise figure or the MTI AP8-TFT with conversion gain: 65dB and noise figure: 0.1 , all three you can buy in ebay.

Regards

mos
Posts: 12
Joined: Tue Apr 17, 2018 4:05 pm

Re: Prime focus Ku ONLY LNB

Postby mos » Mon Apr 30, 2018 4:22 am

can you line the back of a big mesh dish with aluminum foil will that help bounce a better ku into lnb?
V8 Golden

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iq180
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Re: Prime focus Ku ONLY LNB

Postby iq180 » Mon Apr 30, 2018 1:17 pm

mos wrote:can you line the back of a big mesh dish with aluminum foil will that help bounce a better ku into lnb?


You can take out the mesh and replace it with sheet metal, I have done it and it works great, remember to paint it with flat black or flat gray paint before you put your LNB on it, if you don't paint it you will kill your LNB just as soon as the sun hits it.

mos
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Re: Prime focus Ku ONLY LNB

Postby mos » Wed May 02, 2018 5:31 am

yes thanks i have an idea now i will try it also is there a difference with the focal point distance of ku lnb compared to c lnb? i have 8 feet dish.
V8 Golden

Wilis13
Posts: 26
Joined: Fri Mar 09, 2018 2:35 pm

Re: Prime focus Ku ONLY LNB

Postby Wilis13 » Tue May 15, 2018 2:02 am

I have a mesh dish and it works great with both c band and ku. I use the same focal distance. If your dish is well aligned you should be able to scan ku.

Jim
Posts: 54
Joined: Sat Oct 28, 2017 2:24 pm

Re: Prime focus Ku ONLY LNB

Postby Jim » Tue May 15, 2018 9:44 pm

mos wrote:yes thanks i have an idea now i will try it also is there a difference with the focal point distance of ku lnb compared to c lnb? i have 8 feet dish.


The focal point for your particular dish is the focal point no matter if it's C or Ku. I have a 10' Mesh dish that gets excellent C/Ku. The distance is calculated http://www.satsig.net/focal-length-parabolic-dish.htm

Jim
Posts: 54
Joined: Sat Oct 28, 2017 2:24 pm

Re: Prime focus Ku ONLY LNB

Postby Jim » Tue May 15, 2018 9:48 pm

Jim wrote:
mos wrote:yes thanks i have an idea now i will try it also is there a difference with the focal point distance of ku lnb compared to c lnb? i have 8 feet dish.


The focal point for your particular dish is the focal point no matter if it's C or Ku. I have a 10' Mesh dish that gets excellent C/Ku. The distance is calculated http://www.satsig.net/focal-length-parabolic-dish.htm
. If you know th the brand of your dish this chart will help too! http://www.bigdish.info/mainten/lfocal.html


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