[evlatests] [JIRA] Commented: (ECDATA-24) S band blank field -- 8mar10 (fwd)

Ken Sowinski ksowinsk at nrao.edu
Tue Mar 9 17:05:22 EST 2010


On Tue, 9 Mar 2010, Michael Rupen wrote:

> ----------------------------------------
>
> RFI:
>
> The 256 MHz total bandwidth was very clean, except for the following:
>
> 1) RFI @ 3072 MHz (channel 27 in IF1).
> This is primarily seen on baselines to antenna 9 (E06), in both RR and LL 
> data.
> An extremely week hint of it can be seen on baselines:
> 8-15 (N01-W06) RR & LL
> 15-27 (W06-E03) LL
> 24-27 (W05-E03) LL
>
> 2) RFI @ 3200 MHz (channel 27 in IF2).
> This is seen on all baselines in both RR and LL, except for baseline 24-28
>  (W05-N08) LL.

This looks like the multiple of 128 MHz birdie that we have
seen all over.  Perhaps we should use "default" continuum
tunings that are a multiple of 128 MHz so that this appears
at DC rather than in band.

Ken




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