[evlatests] New (to me) L-band RFI

[Lorant Sjouwerman]

Does ODS take into account the wide extent of the sidelobes or only the 
primary beam?


On 4/16/26 11:33, Ylva Pihlstrom via evlatests wrote:
> Then indeed ODS should have been active and reporting to SpaceX.
> Ylva
>
>
> *From: *Rick Perley <rperley at nrao.edu>
> *Date: *Thursday, April 16, 2026 at 11:22
> *To: *Ylva Pihlstrom <ypihlstr at nrao.edu>, evlatests <evlatests at nrao.edu>
> *Subject: *Re: New (to me) L-band RFI
>
> Ylva:
>
> The RFI was seen with the L-band receiver, in the 16^th  spectral 
> window.  The RIF wasn't strong enough to cause problems to any other 
> SPW — and indeed, the portion of the 16^th  SPW lying outside that 
> frequency range looked fine.
>
> Rick
>
> ------------------------------------------------------------------------
> *From:* Ylva Pihlstrom <ypihlstr at nrao.edu>
> *Sent:* Thursday, April 16, 2026 11:17 AM
> *To:* Rick Perley <rperley at nrao.edu>; evlatests <evlatests at nrao.edu>
> *Subject:* Re: New (to me) L-band RFI
> That band is exactly the one of SpaceX’s downlinks.  If the L-band 
> receiver was used, the ODS may or may not have been active depending 
> on the frequencies used in the setup: 
> https://obs.vla.nrao.edu/ods/index.html/nrao_ods_status.html 
> <https://obs.vla.nrao.edu/ods/index.html/nrao_ods_status.html>).
>
> Ylva
>
>
> *From: *evlatests <evlatests-bounces at listmgr.nrao.edu> on behalf of 
> Rick Perley via evlatests <evlatests at listmgr.nrao.edu>
> *Date: *Thursday, April 16, 2026 at 11:11
> *To: *evlatests <evlatests at nrao.edu>
> *Subject: *[evlatests] New (to me) L-band RFI
>
> From data taken two nights ago, a strong RFI source at L-band is seen 
> — on all antennas.  It spans 1.990 to 1.995 GHz.
>
> Rick
>
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-- 
-

Regards,

Lorant Sjouwerman - Scientific Services -lsjouwerman at nrao.edu
  (he, him, his) ----------------------------------------------
c/o NRAO Array Operations Center       Phone:  +1-575-835-7332
     P.O. Box O (1011 Lopezville Rd)    Switch: +1-575-835-7000
     Socorro NM 87801                   Fax:    +1-575-835-7027
Also a PandA Adjunct Professor at the University of New Mexico
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