[evlatests] [Vlite-external] MUOS RFI

[Rick Perley]

     Oops, my bad.  I confused the two ...

     :(

     Rick

On 06/23/2014 04:00 PM, Tracy Clarke (Foreign National) wrote:
> Hi Rick,
>
> Nope, the MUOS is 20 MHz (4x5 MHz bands) from 360 to 380 MHz. The email message I sent says that "VLITE is 64 MHz,
> centered in 352 MHz."
>
> Cheers,
>
> Tracy
>
> Tracy Clarke
> ------------------------------------------------
> Research Astronomer
> Remote Sensing Division
> Naval Research Laboratory
> 4555 Overlook Ave SW
> Washington, DC 20375
> tracy.clarke.ca at nrl.navy.mil
> (tel) 202-404-4297
> (fax) 202-404-8894
> ------------------------------------------------
>
>
>
> On Jun 23, 2014, at 4:21 PM, Rick Perley <rperley at nrao.edu> 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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>>