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poor snr on ao 40

Here is my set up

6 ft dish gain 31 db
DEM pre amp .85 db nf gain 17 db
AIDC 2733 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.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

Thanks in advance for the help
nick k5qxj

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