[evlatests] C-band 6200 MHz RFI IF BD ea28

[Rick Perley]

     ... and it's a pity we don't have the funds to pay to have these 
links to go around the Plains of Augustin ...  I imagine the owners of 
these transmitters are unlikely to pay for this ...

     Rick

On 04/29/2015 12:49 PM, Dan Mertely wrote:
> The 6182-6212 RFI seen on ea28 and adjacent antennas on the north
> arm is almost certainly due to the State of NM digital data transmitter
> on Davenport.  The path is from Davenport to Mangus mountain. Both
> are electronic sites with a number of C and VHF/UHF transmitters.
> I've attached a screen shot from the FCC search page.  These are all
> fully licensed transmitters and have a legal right to operate. (See
> attached.)
>
> I will discuss the operation with their engineer to see if they can
> modify the station parameters some in order to reduce the side lobe
> hitting our north arm.  Otherwise all we can do is log the frequency
> and know that it is there.  Updates pending.
>
> C-band is filled with these high power point-to-point digital data
> links.  Multiple paths originate from electronic sites at Davenport,
> Mangus, Gray Hill, Magdalena, Socorro Peak, Luis Lopez, Lemitar, ...
> etc.  Sigh!  If only we owned the airwaves!
>
> -Mert
>
>
> On 4/13/2015 9:48 AM, EVLA Operations wrote:
>> Hi Dan,
>>
>> Here's the screenshots of the bandpass plots, with the strong noise on
>> ea28 IF B and D on pad BN7/N28.  It looks to be from around 6182 to 6212
>> MHz.  Also attached are plots from nearby ea06 (BN5) and ea07 (BN8).
>> (ea22 was parked, not in use and was at a different band, so there's no
>> info from that pad.)
>>
>> Thanks.
>>
>> Matt
>
> On 4/13/2015 10:40 AM, Jim Ogle wrote:>     Work Order :  C136361
> >
> >   * WO Status        :  OPD
> >     Asset Number        :  03-08-006.0CM-0VL
> >     Asset Short Desc    :
> >     Asset Location        :
> >     Originator        :  Gardiner, Matt
> >   * Asset Status        :  ISF
> >     Safety            :  N
> >     Plan Priority        :  3
> >     Origination Date    :  4/13/2015
> >     Due Date            :  4/13/2015
> >     Fault Code        :  REPORT
> >
> >     Work Requested        :  Ant. 28 C-band IFs B & D showed very
> > strong RFI from about 6182 to 6212 MHz in bandpass plots with power of
> > -50 to -30 dBm/channel.  Seen in 15A-070_sb30423823 which switched
> > between C & L bands from 12:22-15:00 UT 4/13.  ea28 C-band IF B & D pwr
> > into/out of T304s was weak and fringes very weak. ea28 is at BN7/N28.
> > ea07 (BN8) and ea06 (BN5) plots also show some RFI, much lower, at the
> > same freq.  Screenshots of the plots sent to Dan.
> >
> >     Employee ID        :  =>IPGRFI
> >   * Completed (Y/N)    :
> >   * Date (MM/DD/YYYY)    :
> >   * Time worked        :
> >   * Corrective Action    :
> >
> >   * Values required when email is returned.
>
>
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