The original PacSats used these frequencies;

AMSAT-OSCAR-16

Uplinks 145.9 - 145.92 - 145.94 - 145.96

Downlinks 437.025 - 437.05

LUSAT-OSCAR-19

Uplinks 145.84 - 145.86 - 145.88 - 145.9

Downlinks 437.125 - 437.1

There is no mention that the second downlink was used for packet or telemetry.

The article does mention OSCAR-19 had a modified CW beacon for telemetry but does not indicate that was the second downlink.

OSCR-16 carried an experimental beacon on 2401.2.