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poor snr on ao 40 2nd note

sorry about the 1st note here is a little more info

Here is my set up

6 ft dish gain 31 db linear pol
DEM pre amp .85 db nf gain 17 db
AIDC 3733 lnb stub removed
3 db loss coax between LNB and receiver
Yaesu 736 receiver

I am receiving 6db of sun noise  this implies g/t of 8 db

I am receiving the MB  15 db above the noise with squint angle < 10 deg
range app 50 k km.I think that i should see the MB at 27 db above the noise.
To put it another
way if i see 6 db of sun noise what should i see the MB with squint angle <
than 10 deg range app 50 k km.

Thanks in advance for the help
nick k5qxj

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