[evlatests] Ku-band RFI -- how bad it can be...

[Dan Mertely]

Hi Rick.  I'm surprised that the band seems worse than before.
The low Ku band, "Fixed Satellite, (space-to-earth)" (read GSO)
allocation is 11.7-12.2 GHz.  Then from 12.2-12.7 is the broadcasting
satellite down-link band.  Above that are the uplinks, which we are
unlikely to see (none nearby).  So 11.7-12.7 GHz should have been
very noisy for years.  -Mert

On 10/18/2019 11:40 AM, Rick Perley via evlatests wrote:
>      I distributed yesterday a 'waterfall' plot of severe X-band RFI, 
> affecting the upper half of the band.
> 
>      Unsurprisingly, it extends well in Ku band.  Attached here is a 
> similar plot, for the spectral range 12 -- 14 GHz.  This is a very short 
> baseline (N1 x N2), with 1 second averaging, and 2 MHz spectral 
> resolution.  Time runs vertically, frequency horizontally.  The X-axis 
> is labeled in terms of spectral window and channel.
> 
>      The source is 3C273 -- the 'dark' side of the plot, at the higher 
> frequencies, is RFI free, and is at a level of 18 Jy.  The grey-scale is 
> logarithmic, with the maximum at 567 Jy.
> 
>      The RFI cuts off at 12.7 GHz.  Above that (at least to 16 GHz), the 
> spectrum is really clean.
> 
>      Rick
> 
> 
> 
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