The SPS-30 did not carry an integrated IFF (Identification Friend or Foe) antenna as some other radar antennas did. An AS-791/UPA-43 IFF antenna was mounted on the aft tower platform close to the SPS-30 and slaved to it so it pointed in the same direction and rotated at the same rate. When the SPS-30 was installed in 1963 a different IFF antenna was installed, but it was replaced by the AS-791 by 1967. This model is approximate. The overall dimensions were taken from data sheets but the details came from some not-too-clear photos.
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AS791-UPA43 IFF 1 small.jpg [ 133.06 KiB | Viewed 3047 times ]
Also on the aft tower platform was an AS-979/UKR telemetry antenna. I think, but I am not certain, this was the antenna that received telemetry information from Talos missiles in flight. Some missiles had telemetry packages installed that sent back detailed readings of multiple data streams for wing position, engine operation and proximity fuze target detection signals. All Talos ships had an AS-979 mounted close to the SPG-49 Talos target tracking antennas and SPW-2 Talos missile guidance transmitter antennas. The antenna had 12 ground plane elements radiating from the base and a helical antenna inside the truncated cone cover. The model is based upon photoguestimation from several photographs.
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AS979 UKR antenna 1 small.jpg [ 118 KiB | Viewed 3047 times ]
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AS979 UKR antenna 2 small.jpg [ 103.62 KiB | Viewed 3047 times ]
Here is a picture of the
Oklahoma City aft radar tower with the antennas installed, in the configuration of mid 1971.
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aft tower 11 Sep 2018 3 small.jpg [ 128.84 KiB | Viewed 3047 times ]
The AS-979 telemetry antenna was initially (1963) installed in the same position on all of the Talos CLGs (USS
Galveston CLG-3, USS
Little Rock CLG-4 and USS
Oklahoma City CLG-5), using the same platform extension on the aft side of the tower platform. Later (1974) on the
Little Rock and
Oklahoma City the AS-979 telemetry antennas were moved forward on the aft tower platform closer to the SPS-30 and another telemetry antenna was mounted at the AS-979's original position. The
Galveston was decommissioned in 1970 before this change was made.
The AS-791 IFF antenna was mounted in different places on the three Talos CLGs. On the
Galveston it appears to have been mounted on the main platform behind the SPS-30 when the '30 was installed in 1963. But photos from 1967 appear to show the antenna, or something like it, at the front edge of the midships radar tower. Unfortunately, all pictures I have seen have been low resolution and grainy, and it is not possible to identify these antennas with certainty.
The
Little Rock had the AS-791 IFF antenna mounted on a platform extension at the starboard front of the aft tower platform. On the
Oklahoma City it was mounted on a platform extension at the starboard rear of the aft tower platform, as shown in the picture above.