[evlatests] Pulsed RFI at x-band

[Dan Mertely]

This region of X-band is used by airborne collision avoidance
and weather radars, both commercial and military.  So, if the
RFI is intermittent and changes strength a lot, it is probably
an airborne radar.  -Mert


Rick Perley wrote:
>     In general, X-band is very clean.  But an interesting pulsed 
> emission is seen between 9335 and 9243 MHz.  The pulses are on all 
> baselines (hence, external in origin), are seen in both polarizations 
> (no surprise, given they come in through the sidelobes) and have a 
> 4-second period.  They are restricted to a few (3 or 4) unique 
> frequencies.  They are not very strong, and should be very easy to 
> excise from the data through an 'RFLG' type algorithm. 
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