Using Scan&Tioune as of today I recognized a strange background noise on my WB receiver, when doing a very wide scan. I allways was disapointed because of low MER readings. What could be the reason for this strange periodic noise? I am using a 85cm offset dish pointing to QO-100 and I have a second LNB on the side for Astra in 18 degrees.
Noise level on WB receiver
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There are no other transponders at 10.5 GHz so it looks like you are picking up image frequency signals. Try another LNB.
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If I change the bandwith setting on Scan&Tioune there is no periodicity of the noise any more. Just a big hump at the band center.
