The Iridium System is part of the wider L-band , adjacent to the 1610.6–1613.8 MHz Radio Astronomy Service band .
The Iridium System presently operates within a 1618.85 to 1626.5 MHz band , part of the wider L-band , adjacent to the 1610.6–1613.8 MHz Radio Astronomy Service ( RAS ) band .
Iridium satellite constellation