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... 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 ... <br>
<br>
Rick<br>
<br>
<div class="moz-cite-prefix">On 04/29/2015 12:49 PM, Dan Mertely
wrote:<br>
</div>
<blockquote cite="mid:5541279D.3090500@nrao.edu" type="cite">The
6182-6212 RFI seen on ea28 and adjacent antennas on the north
<br>
arm is almost certainly due to the State of NM digital data
transmitter
<br>
on Davenport. The path is from Davenport to Mangus mountain.
Both
<br>
are electronic sites with a number of C and VHF/UHF transmitters.
<br>
I've attached a screen shot from the FCC search page. These are
all
<br>
fully licensed transmitters and have a legal right to operate.
(See
<br>
attached.)
<br>
<br>
I will discuss the operation with their engineer to see if they
can
<br>
modify the station parameters some in order to reduce the side
lobe
<br>
hitting our north arm. Otherwise all we can do is log the
frequency
<br>
and know that it is there. Updates pending.
<br>
<br>
C-band is filled with these high power point-to-point digital data
<br>
links. Multiple paths originate from electronic sites at
Davenport,
<br>
Mangus, Gray Hill, Magdalena, Socorro Peak, Luis Lopez, Lemitar,
...
<br>
etc. Sigh! If only we owned the airwaves!
<br>
<br>
-Mert
<br>
<br>
<br>
On 4/13/2015 9:48 AM, EVLA Operations wrote:
<br>
<blockquote type="cite">Hi Dan,
<br>
<br>
Here's the screenshots of the bandpass plots, with the strong
noise on
<br>
ea28 IF B and D on pad BN7/N28. It looks to be from around 6182
to 6212
<br>
MHz. Also attached are plots from nearby ea06 (BN5) and ea07
(BN8).
<br>
(ea22 was parked, not in use and was at a different band, so
there's no
<br>
info from that pad.)
<br>
<br>
Thanks.
<br>
<br>
Matt
<br>
</blockquote>
<br>
On 4/13/2015 10:40 AM, Jim Ogle wrote:> Work Order
: C136361
<br>
>
<br>
> * WO Status : OPD
<br>
> Asset Number : 03-08-006.0CM-0VL
<br>
> Asset Short Desc :
<br>
> Asset Location :
<br>
> Originator : Gardiner, Matt
<br>
> * Asset Status : ISF
<br>
> Safety : N
<br>
> Plan Priority : 3
<br>
> Origination Date : 4/13/2015
<br>
> Due Date : 4/13/2015
<br>
> Fault Code : REPORT
<br>
>
<br>
> Work Requested : Ant. 28 C-band IFs B & D
showed very
<br>
> strong RFI from about 6182 to 6212 MHz in bandpass plots with
power of
<br>
> -50 to -30 dBm/channel. Seen in 15A-070_sb30423823 which
switched
<br>
> between C & L bands from 12:22-15:00 UT 4/13. ea28
C-band IF B & D pwr
<br>
> into/out of T304s was weak and fringes very weak. ea28 is at
BN7/N28.
<br>
> ea07 (BN8) and ea06 (BN5) plots also show some RFI, much
lower, at the
<br>
> same freq. Screenshots of the plots sent to Dan.
<br>
>
<br>
> Employee ID : =>IPGRFI
<br>
> * Completed (Y/N) :
<br>
> * Date (MM/DD/YYYY) :
<br>
> * Time worked :
<br>
> * Corrective Action :
<br>
>
<br>
> * Values required when email is returned.
<br>
<br>
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<br>
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