[TenTec] Orion's Noise Floor

[Bill Tippett]

Hi Rich,

K5SF wrote:
 >May I suggest running the test again with the 1Khz filter ( or the Inrad
#352 also in the 1Khz position ).

 >This might help improve the numbers by eliminating the 500 Hz/ 250Hz Filter
pre-amp .

         Roofing filters have nothing to do with MDS which is a pure 
sensitivity
measurement.  You are thinking of two-signal IMD performance.  It's important
to use a consistent 500 Hz BW for this measurement since a different BW
filter will result in different readings due to Noise bandwidth effects.

                                         73,  Bill  W4ZV