Problem with Prime Focus 2.4M (8 Foot) and Ku Band

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enb141

Thread Starter
SatelliteGuys Pro
Aug 5, 2009
267
6
Central America
F/D is Focal length/Diameter
but your focal length measured from the bottom center of the dish to a point just inside the feed throat. (Not to the lnbf holder)
I calculate your Focal length to be 86.75mm. and the F/D at .36

Thanks for the calculation so I think my f/D is .38 because a lot of similar dishes of mine are that 0.38, maybe I'm wrong but I bet I didn't measured correctly and my f/D is .38 but still I think the Invacom is not good at that low f/D (correct me if I'm wrong)
 
77TA

77TA

SatelliteGuys Pro
Aug 27, 2013
562
50
Arkansas
I may have missed it, but did you ever mention what brand the dish is? It's usually not hard to find specs on a branded dish.
 
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enb141

Thread Starter
SatelliteGuys Pro
Aug 5, 2009
267
6
Central America
The F/D is up to the feed horn, not the LNB(F) that's attached to it. Specs say the ADF-120 is adjustable from .32 to .43 http://www.the-lighthouse.se/eng/satellit/c180/pdf/ADF-120.pdf

From their chart, looks like you need 4 to 4.5mm protruding out the front of the scalar for F/D of .38 to .36.

what is a protruding?

The brand of my antenna is thundersat, I don't have the model it is Polar Mount 2.4 meters, that's all the information I got.
 
FaT Air

FaT Air

HOA Free Zone
Feb 27, 2010
6,668
914
97W 48N
what is a protruding?
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enb141

Thread Starter
SatelliteGuys Pro
Aug 5, 2009
267
6
Central America
After doing the adjustments all of you gave me I got a lot of increase of strength on my 2.4 Prime Focus but still if far from what I was specting, so now I'm gonna check how the Golden Interstar GI-209P works on this satellite.
 
wildbill47

wildbill47

SatelliteGuys Pro
Jan 3, 2008
290
18
northern California
I have got the "C" band lnb to work ok but "KU" will not work ? LNB says LO of 9750 and 10600 and when I scan get nothing on those frequencies. My other ku lnb's are 10750. How do I know what the IF freq is ?
 
FaT Air

FaT Air

HOA Free Zone
Feb 27, 2010
6,668
914
97W 48N
LNB says LO of 9750 and 10600
A Universal LNBF. Must set the receiver LNB programming correctly. Since N.A. satellites only use 11700 to 12200, Set to Standard LNB and set the L.O. to 10600. ALSO- 22Khz has to be set to ON. Otherwise set to Universal LNB (22Khz should be grayed out- automatic selection) and waste time scanning the 10500 to 11700* band in addition to the 11700 - 12200 band. (*nothing CONUS uses it)
I.F. frequency = Transponder freq minus L.O. freq.
 
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