[evlatests] Latest X-band RFI tests

Walter Brisken wbrisken at nrao.edu
Mon Jul 17 21:09:53 EDT 2006


Hi Rick,

Was there any sign of 8192 in any cross-correlation?  I expect that Walsh 
Switching should quite effectively remove this as long as it doesn't cause 
non-linear response.

-W

>    In summary:
>
>    The absorption/shielding appears to be effective for the 8799 MHz
> line -- presumably because the origin involves radiative coupling
> between the two mixers/LOs.  However, at 8192 MHz, there is still quite
> a strong response, despite the shielding and absorption.  Another order
> of magnitude (10 dB) is likely needed, if we are to reduce this to
> negligible values.
>
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