Sven Grahn Pictures of the truss mounted
system of eight dishes for deep space tracking that has been used since
the early space age for tracking Soviet space probes are well-publicised
over the years. We now know that the system was called ADU-1000 and consisted
of eight (8) 16 meter dishes. However, I recently ran across
a picture of the system with a completely different front feed for the
dishes (Picture on the right below). The usual pictures of the system show
a Cassegrain system with subreflectors mounted on quadrapods in front of
the dishes (picture on the left below). I have only seen one picture of
the front fed system, reproduced below. There is a "shepheard's hook" waveguide
which seems to be about 29-30 cm wide, i.e. about 11 inches which means
that it could well be intended for the standard 770 MHz deep-space uplink!
It seems reasonable to assume that this is the transmit antenna at the
the so-called south station of the Yevpatoria deep-space communications
complex. Thus, double reflector antennas are those for reception at the
"North Station". (See "Yevpatoria
- as the U.S. saw it in the 60's").
Cassegrain feed system on
"North Station" receive
Front-fed system of 8 dishes.
"South Station" transmit