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[i]A down-link telemetry system, consisting of a PCM-FM S-band transmitter, a power divider and two antennas, was added to each SRB on STS-6. This system was needed to assure the availability of measurement and event data in case the tape recorders were damaged or unrecoverable as on STS-4. Both LH (A17) and RH (A18) SRB transmitters performed properly and downlinked Left and Right PCMI data to the aircrafts, AGAR-I, ACAH-2, ground stations, MILA, GBI, TEL-4, [b]and the Redstone tracking ship.[/b] It was confirmed that all PCMl data functioned properly with no lost measurements until loss of signal when the telemetry system powered down at water impact.[/i]
[i]USNS Redstone tracking data also provided impact time and impact velocity verification for the LH SRB.[/i]
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