LNB noise.

    Hi there,


    i have a problem with my LNB. It is an Opticum LSP-02G single LNB. It has a noise which is 10-15 db higher than the noise on the websdr.

    My problem is, my signal is only 15 db above the noise of the websdr, so i can hear my own signal on the websdr without any problems BUT i can not hear my signal with my own LNB/RTLSDR(NEWGEN.RTLSDR with TCXO). I can hear my signal only if i whistle.

    Which experience did you make with your LNB and which firm is it.?

    ... and is there a chance to improve my LNB?


    73s


    Detlef

    DD1EG maybe an attenuator is needed to lower the noise level. A simpler solution could be to reduce the gain of the RTL SDR in order to increase the dynamic range. A typical SNR is about 20-25 dB.

    The procedure that I use is to receive the CW beacon , starting the RF gain at minimium and as you increase the SNR and noise level increases. After one point the SNR does not increases but increases the noise only. I selcted the minimum gain that I archive this 'stable' SNR in order to have the best dynamic range as RTL is only 8 bits.