  We consider how an advanced civilization might build a radiator to send
gravitational waves signals by using small black holes. Micro black holes on
the scale of centimeters but with masses of asteroids to planets are
manipulated with a super advanced instrumentality, possibly with very large
electromagnetic fields. The machine envisioned emits gravitational waves in the
GHz frequency range. If the source to receiver distance is a characteristic
length in the galaxy, up to 10000 light years, the masses involved are at least
planetary in magnitude. To provide the energy for this system we posit a very
advanced civilization that has a Kerr black hole at its disposal and can
extract energy by way of super-radiance. Background gravitational radiation
sets a limit on the dimensionless amplitude that can be measured at
interstellar distance using a LIGO like detector.
