[evlatests] New, strong, L-band RFI

[Dan Mertely]

Hi Rick.  Yes, the 1444.5 MHz RFI was due to a
telemetry package on the "JPL REMOTE" flight #625N
balloon launched on Friday, 23 Sept from the Columbia
Scientific Balloon Facility in Ft Sumner, NM.

They actually had 2 balloons active at the
same time the last of last week: 625N & 624N.  The
frequencies used were:

624N: 1524.5, 1515.5, 1501.5 MHz
625N: 1444.5, 1524.5, 2378.5 MHz

Operations received the usual 1 day or less notification.
The info should have been in the Operator's Log.

It is the height of the balloon season now at Ft.
Sumner.  Expect more L & S band activity.  I could try
to keep everyone informed with RFI Alerts, but the
trouble with balloon alerts is that the CSBF scrubs missions
more than half of the time (due to wind conditions, I suppose),
so we would get a lot of false alarms.

-Mert


Rick Perley wrote:
>     A 'spectral sweep', with 125 kHz resolution, was done Friday, and L, 
> S, C, and X bands. 
> 
>     A quick perusal of the L-band data shows a new RFI birdie, never 
> seen before (to my knowledge):
> 
>     1444.50 MHz.  This is seen on *all* baselines except those connected 
> to antenna 1 -- which was at the end of the west arm at the time.  All 
> others are in D configuration.  The birdie is well resolved (a few MHz 
> wide), and is *very* strong.   The fact that is is not seen on ea01, and 
> is seen on all others, strongly suggests a local origin. 
> 
>     One other observation:  The well-known 1408 MHz birdie is on many 
> baselines, but is *especially* strong on those connected to ea13. 
> 
>     More to follow ...
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