[evlatests] RFI sweep June 2015

[Bryan Butler]

there is plenty of narrow-band RFI in both L- and S-bands.  i won't 
elaborate - mert can do a better job.

but if you're right and there is an argument to not do the RFI sweep in 
L- and S-bands, then i'm all ears.

	-bryan


Frazer Owen wrote on 7/9/15 19:05 :
> On 7/9/15 5:59 PM, Bryan Butler wrote:
>>
>> but not at the higher spectral resolution of the RFI sweep.  the
>> standard continuum at L-band is 1 MHz channel widths, if memory
>> serves, and i think it's 2 MHz at S-band and above.
>>
>>     -bryan
> In those bands, essentially all the interference is broad-band, so I
> don't see why the resolution matters.
>>
>> Frazer Owen wrote on 7/9/15 17:54 :
>>> On 7/9/15 5:34 PM, Bryan Butler wrote:
>>>>
>>>> it's not clear to me that we need to extend the RFI script to cover
>>>> P-band.  every time we observe in P-band we get a good RFI "sweep"
>>>> because we cover the entire usable band at good spectral resolution.
>>>> the reason we make special observations at the other bands is because
>>>> we never observe across the entire band at that resolution.  i suggest
>>>> that we already have an overabundance of effective P-band "RFI sweep"
>>>> data sitting in the archive.
>>>>
>>>>     -bryan
>>> Doesn't the same argument apply at least to L and S-band since we
>>> regularly observe the entire band in most continuum observations ?
>>>
>>> ---Frazer
>>>>
>>>>
>>>> Huib Intema (NRAO) wrote on 7/8/15 12:59 :
>>>>> Since P-band is a standard observing band, and in terms of RFI not
>>>>> much worse than other low frequency bands, it would be useful to
>>>>> include it in tests like this. This is relevant for both continuum
>>>>> observing as (future) spectral line observing.
>>>>>
>>>>> -- Huib
>>>>>
>>>>>
>>>>> On Jul 8, 2015 6:49 PM, Emmanuel Momjian <emomjian at nrao.edu> wrote:
>>>>>>
>>>>>> A RFI sweep spanning the frequency range 1-50 GHz, with a channel
>>>>>> separation of 125 KHz, was carried out on June 18, 2015. The array
>>>>>> was
>>>>>> in A-configuration.
>>>>>>
>>>>>> We have the spectra at
>>>>>> https://science.nrao.edu/facilities/vla/observing/RFI/jun-2015-A-configuration/june-2015-A-configuration
>>>>>>
>>>>>>
>>>>>>
>>>>>> For each receiver band, baseband based (1 GHz wide) png image
>>>>>> files are
>>>>>> posted. Also available is a PDF file linked from each band's page
>>>>>> that
>>>>>> has subband based (128 MHz wide) spectra for a more detailed view.
>>>>>>
>>>>>> The full assessment of this RFI sweep will be carried out in
>>>>>> coordination with the RFI group.
>>>>>>
>>>>>> Emmanuel
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>>>>>
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