[IGSMAIL-6257] Update: rcvr_ant.tab: Block IIIA added

[Robert Khachikyan]

  Dear Colleagues,

The rcvr_ant.tab standard has been updated with the following updates:

| 13 SEP 2010  Added SEPT ASTERX2EL, SEPT ASTERX3, SEPT POLARXS                |
| 26 AUG 2010  Added BLOCK IIIA                                                |

ftp://igscb.jpl.nasa.gov/pub/station/general/rcvr_ant.tab


Many thanks to Ralf Schmid on behalf of the IGS Antenna Working group 
for his support to this standard.

Best Regards,
--Robert Khachikyan
IGS Central Bureau