VLBA RFI Bulletin 24:  Roving Sands '99 Gears Up:

Each year the combined forces of the US and NATO stage a 10 to 15 day
series of war games throughout the eastern half of NM.  The VLA and the
VLBA-PT, VLBA-LA, and VLBA-FD sites experience a considerable increase
in RFI during the time these games are going on, especially in P-band
(90 cm, 328 MHz), L-band (20 cm, 1400 MHz), and (for VLBA sites) S-band
(13 cm, 2300 MHz).  Frequencies which are typically in heavy use during
the games are listed below:

		1357    MHz
		1365    MHz
		1369    MHz
		1385    MHz
		1393    MHz
		1432.5  MHz

In addition, the following 2 GPS frequencies may experience an increase
in jamming activity during the games:

		1227.6  MHz
		1575.42 MHz

Preliminary plans are underway for the scheduling of the 1999 Roving
sands war games, a copy of that schedule is shown below:

**********************************************************************
ROVING SANDS '98 "wheels-up" Preliminary schedule (in MST)

June 18 through June 27, 1999

(Additional scheduling detail will be made available as we draw
nearer to the dates.)
**********************************************************************

To the extend that we are able, we should try to avoid observations
at the above itemized RAJPO transponder frequencies during the in-
air times listed above.  Once the June schedule comes out in late
May, I will cross-reference the Roving Sands schedule with the
list of observations, and issue notices to the affected observers.

Incidently, the NRAO, VLA & VLBA WWW sites now have this and other 
RFI bulletins on-line, as well as the latest L-band, W8 grayscale
plots for the previous 60 or so days.  Check them out, let us know