Re: LRPT Laboratory

Fred Albertson

Hi Patrick, Andrea and Josef,

More mysteries:

Yesterday, I took the QFH antenna and split the receive.  The resulting layout:

String 1: QFH antenna (split) -> Sawbird LNA/Filter -> Rspduo -> PC 1

String 2: QFH antenna (split) -> LNA4all (no filter) -> RTL/SDR 2832 -> PC 2

The attached picture shows the results from the two strings side by side:

I honestly do not know what I am seeing. I understand why I might
see more lines in the String 2 picture, since there is no filter in that
chain, but why are the lines different in thickness?

Any thoughts?

Great day,


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