[evlatests] MUOS RFI

[Dan Mertely]

I wonder where the additional spectrum info came from.  All I could
find on the web identified:

"The service links are comprised of four 5 MHz-wide SA-WCDMA channels
occupying the 20 MHz wide UHF uplink and downlink bands."

and:

"360-380 MHz  MUOS service downlink.  Mobile-satellite (space-to-earth)"

So, 4, 5 MHz wide digital modulation channels fit perfectly in the
360-380 MHz allocation, with room for little else.  -Mert

On 6/23/2014 2:21 PM, Rick Perley wrote:
>       Tracy wrote that the MUOS spectra cover 64 MHz, from 320 -- 384 MHz.
>
>       That's quite a bit more than we actually see.
>
>       I took some high-resolution (time and frequency) data last week to
> check P-band sensitivity.  There was a good mix of long (A-config) and
> short (D-config) baselines.  The MUOS spectral are blindingly obvious on
> all the short spacings.
>
>       The main RFI are in four blocks, each covering 5.00 MHz:
>
>       360.5 -- 364.5
>       365.5 -- 369.5
>       370.5 -- 364.5
>       375.5 -- 379.5
>
>       These are broad band signals with no spectral features.  They
> disappear quite well in the long spacings.
>
>       But in addition, there are six strong but narrow (effectively CW)
> signals at:
>
>       353.25
>       355.81
>       356.81
>       358.56
>       359.31
>       359.81
>
>       The spectral intensity is much higher in these, but since they are
> so narrow, there is little power.
>
>       I hadn't seen these six CW signals before.  I'm guessing there's
> part of the 'MUOS" spectrum.
>
>       We'd better hope the part of the spectrum noted by Tracy is
> belonging to MUOS, but within which we see no RFI, stay that way. The
> 320 -- 360 MHz spectrum is the most sensitive part of the band.
>
>
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